Adding upstream version 2.2.0.upstream/2.2.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

10 files changed, 3446 insertions, 0 deletions

diff --git a/src/lib/config_backend/Makefile.am b/src/lib/config_backend/Makefile.am
new file mode 100644
index 0000000..2b51675
--- /dev/null
+++ b/src/lib/config_backend/Makefile.am
@@ -0,0 +1,25 @@
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+EXTRA_DIST += constants.h
+
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+#EXTRA_DIST += config_backend.dox
+
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+
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+	base_config_backend.h \
+	base_config_backend_mgr.h \
+	base_config_backend_pool.h \
+	constants.h
+
diff --git a/src/lib/config_backend/Makefile.in b/src/lib/config_backend/Makefile.in
new file mode 100644
index 0000000..00ae34e
--- /dev/null
+++ b/src/lib/config_backend/Makefile.in
@@ -0,0 +1,780 @@
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diff --git a/src/lib/config_backend/base_config_backend.h b/src/lib/config_backend/base_config_backend.h
new file mode 100644
index 0000000..9e38919
--- /dev/null
+++ b/src/lib/config_backend/base_config_backend.h
@@ -0,0 +1,87 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef BASE_CONFIG_BACKEND_H
+#define BASE_CONFIG_BACKEND_H
+
+#include <database/database_connection.h>
+
+#include <boost/shared_ptr.hpp>
+#include <cstdint>
+#include <set>
+#include <string>
+
+namespace isc {
+namespace cb {
+
+/// @brief Interface for Kea server specific configuration backend
+/// implementations.
+///
+/// Each Kea server (e.g. DHCPv4 server) needs to implement its own
+/// interface to store and fetch its configuration from the databases.
+/// This is because each Kea server uses a different set of
+/// configuration information. This is a base interface which should
+/// be implemented (and extended) by respective Kea servers to provide
+/// API to store and fetch configuration information from a database.
+/// Such implementation is called configuration backend. Each
+/// configuration backend facilitates a single database type, e.g. MySQL
+/// database. In order to support multiple database types, i.e. MySQL,
+/// PostgreSQL, each Kea server will have to implement 2 separate configuration
+/// backends, one for each database type.
+class BaseConfigBackend {
+public:
+
+    /// @brief Virtual destructor.
+    virtual ~BaseConfigBackend() { }
+
+    /// @brief Returns backend type in the textual format.
+    ///
+    /// @return Name of the storage for configurations, e.g. "mysql",
+    /// "postgresql" and so forth.
+    virtual std::string getType() const = 0;
+
+    /// @brief Returns backend host.
+    ///
+    /// This is used by the @c BaseConfigBackendPool to select backend
+    /// when @c BackendSelector is specified.
+    ///
+    /// @return host on which the database is located.
+    virtual std::string getHost() const = 0;
+
+    /// @brief Returns backend port number.
+    ///
+    /// This is used by the @c BaseConfigBackendPool to select backend
+    /// when @c BackendSelector is specified.
+    ///
+    /// @return Port number on which database service is available.
+    virtual uint16_t getPort() const = 0;
+
+    /// @brief Flag which indicates if the config backend has an unusable
+    /// connection.
+    ///
+    /// @return true if there is at least one unusable connection, false
+    /// otherwise.
+    virtual bool isUnusable() {
+        return (false);
+    }
+
+    /// @brief Return backend parameters.
+    ///
+    /// Returns the backend parameters.
+    ///
+    /// @return Parameters of the backend.
+    virtual isc::db::DatabaseConnection::ParameterMap getParameters() const {
+        return (isc::db::DatabaseConnection::ParameterMap());
+    }
+};
+
+/// @brief Shared pointer to the @c BaseConfigBackend.
+typedef boost::shared_ptr<BaseConfigBackend> BaseConfigBackendPtr;
+
+} // end of namespace isc::cb
+} // end of namespace isc
+
+#endif // BASE_CONFIG_BACKEND_H
diff --git a/src/lib/config_backend/base_config_backend_mgr.h b/src/lib/config_backend/base_config_backend_mgr.h
new file mode 100644
index 0000000..92d6858
--- /dev/null
+++ b/src/lib/config_backend/base_config_backend_mgr.h
@@ -0,0 +1,220 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef BASE_CONFIG_BACKEND_MGR_H
+#define BASE_CONFIG_BACKEND_MGR_H
+
+#include <config_backend/base_config_backend.h>
+#include <database/database_connection.h>
+#include <database/backend_selector.h>
+#include <exceptions/exceptions.h>
+#include <boost/shared_ptr.hpp>
+#include <functional>
+#include <map>
+#include <string>
+
+namespace isc {
+namespace cb {
+
+/// @brief Base class for Configuration Backend Managers (CBM).
+///
+/// Each Kea server supporting Configuration Backend feature implements
+/// a "manager" class which holds information about supported and
+/// configured backends and provides access to the backends. This is
+/// similar to @c HostMgr and @c LeaseMgr singletons being used by the
+/// DHCP servers.
+///
+/// The Config Backend Managers are typically implemented as singletons
+/// which can be accessed from any place within the server code. This
+/// includes server configuration, data fetching during normal server
+/// operation and data management, including processing of control
+/// commands implemented within hooks libraries.
+///
+/// The @c BaseConfigBackendMgr is a base class for all CBMs implemented
+/// for respective Kea servers. It includes mechanisms to register config
+/// backend factory functions and to create instances of the backends using
+/// those factory functions as a result of server configuration. The mechanism
+/// of factory functions registration is useful in cases when the config
+/// backend is implemented within the hook library. Such hook library
+/// registers factory function in its @c load function and the server
+/// simply calls this function to create the instance of this backend when
+/// instructed to do so via configuration. Similar mechanism exists in
+/// DHCP @c HostMgr.
+///
+/// Unlike @c HostMgr, the CBMs do not directly expose API to fetch and
+/// manipulate the data in the database. This is done via, so called,
+/// Configuration Backends Pools. See @c BaseConfigBackendPool for
+/// details. The @c BaseConfigBackendMgr is provided with the pool type
+/// via class template parameter. Respective CBM implementations
+/// use their own pools, which provide APIs appropriate for those
+/// implementations.
+///
+/// @tparam ConfgBackendPoolType Type of the configuration backend pool
+/// to be used by the manager. It must derive from @c BaseConfigBackendPool
+/// template class.
+template<typename ConfigBackendPoolType>
+class BaseConfigBackendMgr {
+public:
+
+    /// @brief Pointer to the configuration backend pool.
+    typedef boost::shared_ptr<ConfigBackendPoolType> ConfigBackendPoolPtr;
+
+    /// @brief Type of the backend factory function.
+    ///
+    /// Factory function returns a pointer to the instance of the configuration
+    /// backend created.
+    typedef std::function<typename ConfigBackendPoolType::ConfigBackendTypePtr
+                          (const db::DatabaseConnection::ParameterMap&)> Factory;
+
+    /// @brief Constructor.
+    BaseConfigBackendMgr()
+        : factories_(), pool_(new ConfigBackendPoolType()) {
+    }
+
+    /// @brief Registers new backend factory function for a given backend type.
+    ///
+    /// The typical usage of this function is to make the CBM aware of a
+    /// configuration backend implementation. This implementation may exist
+    /// in a hooks library. In such case, this function should be called from
+    /// the @c load function in this library. When the backend is registered,
+    /// the server will use it when required by the configuration, i.e. a
+    /// user includes configuration backend of that type in the
+    /// "config-databases" list.
+    ///
+    /// If the backend of the given type has already been registered, perhaps
+    /// by another hooks library, the CBM will refuse to register another
+    /// backend of the same type.
+    ///
+    /// @param db_type Backend type, e.g. "mysql".
+    /// @param factory Pointer to the backend factory function.
+    ///
+    /// @return true if the backend has been successfully registered, false
+    /// if another backend of this type already exists.
+    bool registerBackendFactory(const std::string& db_type,
+                                const Factory& factory) {
+        // Check if this backend has been already registered.
+        if (factories_.count(db_type)) {
+            return (false);
+        }
+
+        // Register the new backend.
+        factories_.insert(std::make_pair(db_type, factory));
+        return (true);
+    }
+
+    /// @brief Unregisters the backend factory function for a given backend type.
+    ///
+    /// This function is used to remove the factory function and all backend instances
+    /// for a given backend type.  Typically, it would be called when unloading the
+    /// a config backend hook library, and thus called by the library's @c unload
+    /// function.
+    ///
+    /// @param db_type Backend type, e.g. "mysql".
+    ///
+    /// @return false if no factory for the given type was unregistered, true
+    /// if the factory was removed.
+    bool unregisterBackendFactory(const std::string& db_type) {
+        // Look for it.
+        auto index = factories_.find(db_type);
+
+        // If it's there remove it
+        if (index != factories_.end()) {
+            factories_.erase(index);
+            pool_->delAllBackends(db_type);
+            return (true);
+
+        }
+
+        return (false);
+    }
+
+    /// @brief Create an instance of a configuration backend.
+    ///
+    /// This method uses provided @c dbaccess string representing database
+    /// connection information to create an instance of the database
+    /// backend. If the specified backend type is not supported, i.e. there
+    /// is no relevant factory function registered, an exception is thrown.
+    ///
+    /// @param dbaccess Database access string being a collection of
+    /// key=value pairs.
+    ///
+    /// @throw InvalidParameter if access string lacks database type value.
+    /// @throw db::InvalidType if the type of the database backend is not
+    /// supported.
+    /// @throw Unexpected if the backend factory function returned NULL.
+    void addBackend(const std::string& dbaccess) {
+        // Parse the access string into a map of parameters.
+        db::DatabaseConnection::ParameterMap parameters =
+            db::DatabaseConnection::parse(dbaccess);
+
+        // Get the database type to locate a factory function.
+        db::DatabaseConnection::ParameterMap::iterator it = parameters.find("type");
+        if (it == parameters.end()) {
+            isc_throw(InvalidParameter, "Config backend specification lacks the "
+                      "'type' keyword");
+        }
+
+        std::string db_type = it->second;
+        auto index = factories_.find(db_type);
+
+        // No match?
+        if (index == factories_.end()) {
+            isc_throw(db::InvalidType, "The type of the configuration backend: '" <<
+                      db_type << "' is not supported");
+        }
+
+        // Call the factory and push the pointer on sources.
+        auto backend = index->second(parameters);
+        if (!backend) {
+            isc_throw(Unexpected, "Config database " << db_type <<
+                      " factory returned NULL");
+        }
+
+        // Backend instance created successfully.
+        pool_->addBackend(backend);
+    }
+
+    /// @brief Removes all backends from the pool.
+    void delAllBackends() {
+        pool_->delAllBackends();
+    }
+
+    /// @brief Delete a config backend manager.
+    ///
+    /// Delete the first instance of a config database manager which matches
+    /// specific parameters.
+    /// This should have the effect of closing the database connection.
+    ///
+    /// @param db_type Backend to remove.
+    /// @param dbaccess Database access string being a collection of
+    /// key=value pairs.
+    /// @param if_unusable Flag which indicates if the config backend should be
+    /// deleted only if it is unusable.
+    /// @return false when not removed because it is not found or because it is
+    /// still usable (if_unusable is true), true otherwise.
+    bool delBackend(const std::string& db_type, const std::string& dbaccess,
+                    bool if_unusable) {
+        return (pool_->del(db_type, dbaccess, if_unusable));
+    }
+
+    /// @brief Returns underlying config backend pool.
+    ConfigBackendPoolPtr getPool() const {
+        return (pool_);
+    }
+
+protected:
+
+    /// @brief A map holding registered backend factory functions.
+    std::map<std::string, Factory> factories_;
+
+    /// @brief Pointer to the configuration backends pool.
+    ConfigBackendPoolPtr pool_;
+};
+
+} // end of namespace isc::cb
+} // end of namespace isc
+
+#endif // BASE_CONFIG_BACKEND_MGR_H
diff --git a/src/lib/config_backend/base_config_backend_pool.h b/src/lib/config_backend/base_config_backend_pool.h
new file mode 100644
index 0000000..1c83677
--- /dev/null
+++ b/src/lib/config_backend/base_config_backend_pool.h
@@ -0,0 +1,649 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef BASE_CONFIG_BACKEND_POOL_H
+#define BASE_CONFIG_BACKEND_POOL_H
+
+#include <cc/data.h>
+#include <config_backend/base_config_backend.h>
+#include <database/backend_selector.h>
+#include <database/database_connection.h>
+#include <database/db_exceptions.h>
+#include <database/server_selector.h>
+#include <functional>
+#include <list>
+#include <string>
+
+namespace isc {
+namespace cb {
+
+
+/// @brief Base class for configuration backend pools.
+///
+/// Each Kea server supporting databases as a configuration repository can
+/// use multiple database instances simultaneously. A pool is a collection
+/// of database backends used by a particular server. Different Kea servers
+/// use different pools because they store and fetch different configuration
+/// information. For example: DHCPv4 server stores and fetches IPv4 subnets,
+/// and DHCPv6 server stores and fetches IPv6 subnets. Therefore, each pool
+/// type will expose a different API calls.
+///
+/// This template class is a base class for all pools used by various servers.
+/// It implements mechanisms for managing multiple backends and for forwarding
+/// API calls to one or many database backends depending on the selections
+/// made via @c BackendSelector class.
+///
+/// @tparam ConfigBackendType Type of the configuration backend. This must
+/// be a class deriving from @c BaseConfigBackend class. It is a class
+/// dedicated to a particular server type, e.g. DHCPv4 server, and from
+/// which database specific backends derive.
+template<typename ConfigBackendType>
+class BaseConfigBackendPool {
+public:
+
+    /// @brief Shared pointer to the Configuration Backend used.
+    typedef boost::shared_ptr<ConfigBackendType> ConfigBackendTypePtr;
+
+    /// @brief Virtual destructor.
+    virtual ~BaseConfigBackendPool() { }
+
+    /// @brief Adds a backend to the pool.
+    ///
+    /// @param backend Pointer to a backend to be added.
+    void addBackend(ConfigBackendTypePtr backend) {
+        backends_.push_back(backend);
+    }
+
+    /// @brief Deletes all backends from the pool.
+    void delAllBackends() {
+        backends_.clear();
+    }
+
+    /// @brief Deletes all backends of the given type from the pool.
+    ///
+    /// @param db_type Backend to remove.
+    void delAllBackends(const std::string& db_type) {
+        typename std::list<ConfigBackendTypePtr>::iterator backend = backends_.begin();
+
+        while (backend != backends_.end()) {
+            if ((*backend)->getType() == db_type) {
+                backend = backends_.erase(backend);
+            } else {
+                ++backend;
+            }
+        }
+    }
+
+    /// @brief Deletes all backends of the given type from the pool.
+    ///
+    /// @param db_type Backend to remove.
+    /// @param dbaccess Database access string being a collection of
+    /// key=value pairs.
+    /// @param if_unusable Flag which indicates if the config backend should be
+    /// deleted only if it is unusable.
+    /// @return false when not removed because it is not found or because it is
+    /// still usable (if_unusable is true), true otherwise.
+    bool del(const std::string& db_type, const std::string& dbaccess,
+             bool if_unusable) {
+        isc::db::DatabaseConnection::ParameterMap parameters =
+            isc::db::DatabaseConnection::parse(dbaccess);
+        bool deleted = false;
+        if (if_unusable) {
+            deleted = true;
+        }
+
+        typename std::list<ConfigBackendTypePtr>::iterator backend = backends_.begin();
+
+        while (backend != backends_.end()) {
+            if ((*backend)->getType() != db_type || (*backend)->getParameters() != parameters) {
+                ++backend;
+            } else if (if_unusable && (!(*backend)->isUnusable())) {
+                deleted = false;
+                ++backend;
+            } else {
+                backends_.erase(backend);
+                return (true);
+            }
+        }
+        return (deleted);
+    }
+
+protected:
+
+    /// @brief Retrieve a single configuration property from the pool.
+    ///
+    /// This is common method for retrieving a single configuration property
+    /// from the databases. The server specific backends call this method to
+    /// retrieve a single object. For example, the DHCPv4 configuration backend
+    /// pool may use this function to implement a @c getSubnet4 method:
+    ///
+    /// @code
+    /// Subnet4Ptr getSubnet4(const SubnetID& subnet_id,
+    ///                       const BackendSelector& backend_selector,
+    ///                       const ServerSelector& server_selector) const {
+    ///     Subnet4Ptr subnet;
+    ///     getPropertyPtrConst<Subnet4Ptr, const SubnetID&>
+    ///         (&ConfigBackendDHCPv4::getSubnet4, backend_selector,
+    ///          server_selector, subnet, subnet_id);
+    ///     return (subnet);
+    /// }
+    /// @endcode
+    ///
+    /// where @c ConfigBackendDHCPv4::getSubnet4 has the following signature:
+    ///
+    /// @code
+    /// Subnet4Ptr getSubnet4(const ServerSelector&, const SubnetID&) const;
+    /// @endcode
+    ///
+    /// If the backend selector is set to "unspecified", this method will iterate
+    /// over the existing backends and call the @c MethodPointer method on each
+    /// backend. It will return the first non-null (or non-zero) value returned
+    /// by this call. For example: if the first backend returns non-null value,
+    /// this value is returned via @c property argument and the calls for the
+    /// rest of the backends are skipped.
+    ///
+    /// @tparam PropertyType Type of the object returned by the backend call.
+    /// @tparam FnPtrArgs Parameter pack holding argument types of the backend
+    /// method to be invoked.
+    /// @tparam Args Parameter pack holding types of the arguments provided
+    /// in the call to this method.
+    ///
+    /// @param MethodPointer Pointer to the backend method to be called.
+    /// @param backend_selector Backend selector.
+    /// @param server_selector Server selector.
+    /// @param [out] property Reference to the shared pointer where retrieved
+    /// property should be assigned.
+    /// @param input Values to be used as input to the backend call.
+    ///
+    /// @throw db::NoSuchDatabase if no database matching the given selector
+    /// was found.
+    template<typename PropertyType, typename... FnPtrArgs, typename... Args>
+    void getPropertyPtrConst(PropertyType (ConfigBackendType::*MethodPointer)
+                             (const db::ServerSelector&, FnPtrArgs...) const,
+                             const db::BackendSelector& backend_selector,
+                             const db::ServerSelector& server_selector,
+                             PropertyType& property,
+                             Args... input) const {
+
+        // If no particular backend is selected, call each backend and return
+        // the first non-null (non zero) value.
+        if (backend_selector.amUnspecified()) {
+            for (auto backend : backends_) {
+                property = ((*backend).*MethodPointer)(server_selector, input...);
+                if (property) {
+                    break;
+                }
+            }
+
+        } else {
+            // Backend selected, find the one that matches selection.
+            auto backends = selectBackends(backend_selector);
+            if (!backends.empty()) {
+                for (auto backend : backends) {
+                    property = ((*backend).*MethodPointer)(server_selector, input...);
+                    if (property) {
+                        break;
+                    }
+                }
+
+            } else {
+                isc_throw(db::NoSuchDatabase, "no such database found for selector: "
+                          << backend_selector.toText());
+            }
+        }
+    }
+
+    /// @brief Retrieve a single configuration property from the backend.
+    ///
+    /// This is common method for retrieving a single configuration property
+    /// from the selected database without specifying the server selector. The
+    /// server specific backends call this method to retrieve a single object.
+    /// For example, the DHCPv4 configuration backend pool may use this function
+    /// to implement a @c getServer4 method:
+    ///
+    /// @code
+    /// ServerPtr getServer4(const BackendSelector& backend_selector,
+    ///                      const std::string& server_tag) const {
+    ///     ServerPtr server;
+    ///     getPropertyPtrConst<ServerPtr, const std::string&>
+    ///         (&ConfigBackendDHCPv4::getServer4, backend_selector,
+    ///          server_tag);
+    ///     return (server);
+    /// }
+    /// @endcode
+    ///
+    /// where @c ConfigBackendDHCPv4::getServer4 has the following signature:
+    ///
+    /// @code
+    /// ServerPtr getServer4(const std::string&) const;
+    /// @endcode
+    ///
+    /// This method is used in cases when server selector is not applicable.
+    ///
+    /// @tparam PropertyType Type of the object returned by the backend call.
+    /// @tparam FnPtrArgs Parameter pack holding argument types of the backend
+    /// method to be invoked.
+    /// @tparam Args Parameter pack holding types of the arguments provided
+    /// in the call to this method.
+    ///
+    /// @param MethodPointer Pointer to the backend method to be called.
+    /// @param backend_selector Backend selector.
+    /// @param [out] property Reference to the shared pointer where retrieved
+    /// property should be assigned.
+    /// @param input Values to be used as input to the backend call.
+    ///
+    /// @throw db::NoSuchDatabase if no database matching the given selector
+    /// was found.
+    /// @throw db::AmbiguousDatabase if multiple databases matching the selector
+    /// were found.
+    template<typename PropertyType, typename... FnPtrArgs, typename... Args>
+    void getBackendPropertyPtrConst(PropertyType (ConfigBackendType::*MethodPointer)
+                                    (FnPtrArgs...) const,
+                                    const db::BackendSelector& backend_selector,
+                                    PropertyType& property,
+                                    Args... input) const {
+        auto backends = selectBackends(backend_selector);
+        if (backends.empty()) {
+            isc_throw(db::NoSuchDatabase, "no such database found for selector: "
+                      << backend_selector.toText());
+
+        } else if (backends.size() > 1) {
+            isc_throw(db::AmbiguousDatabase, "more than one database found for "
+                      "selector: " << backend_selector.toText());
+        }
+
+        property = ((*(*(backends.begin())).*MethodPointer)(input...));
+    }
+
+    /// @brief Retrieve multiple configuration properties from the pool.
+    ///
+    /// This is a common method for retrieving multiple configuration properties
+    /// from the databases. The server specific backends call this method to
+    /// retrieve multiple objects of the same type. For example, the DHCPv6
+    /// configuration backend pool may use this function to implement a
+    /// @c getSubnets6 method:
+    ///
+    /// @code
+    /// Subnet6Collection getModifiedSubnets6(const BackendSelector& backend_selector,
+    ///                                       const ServerSelector& server_selector,
+    ///                                       const ptime& modification_time) const {
+    ///     Subnet6Collection subnets;
+    ///     getMultiplePropertiesConst<Subnet6Collection, const ptime&>
+    ///         (&ConfigBackendDHCPv6::getSubnets6, backend_selector, server_selector,
+    ///          subnets, modification_time);
+    ///     return (subnets);
+    /// }
+    /// @endcode
+    ///
+    /// where @c ConfigBackendDHCPv6::getSubnets6 has the following signature:
+    ///
+    /// @code
+    /// Subnet6Collection getSubnets6(const ServerSelector&, const ptime&) const;
+    /// @endcode
+    ///
+    /// If the backend selector is set to "unspecified", this method will iterate
+    /// over existing backends and call the @c MethodPointer method on each
+    /// backend. It will return the first non-empty list returned by one of the
+    /// backends.
+    ///
+    /// @tparam PropertyCollectionType Type of the container into which the
+    /// properties are stored.
+    /// @tparam FnPtrArgs Parameter pack holding argument types of the backend
+    /// method to be invoked.
+    /// @tparam Args Parameter pack holding types of the arguments provided
+    /// in the call to this method.
+    ///
+    /// @param MethodPointer Pointer to the backend method to be called.
+    /// @param backend_selector Backend selector.
+    /// @param server_selector Server selector.
+    /// @param [out] properties Reference to the collection of retrieved properties.
+    /// @param input Values to be used as input to the backend call.
+    ///
+    /// @throw db::NoSuchDatabase if no database matching the given selector
+    /// was found.
+    template<typename PropertyCollectionType, typename... FnPtrArgs, typename... Args>
+    void getMultiplePropertiesConst(PropertyCollectionType (ConfigBackendType::*MethodPointer)
+                                    (const db::ServerSelector&, FnPtrArgs...) const,
+                                    const db::BackendSelector& backend_selector,
+                                    const db::ServerSelector& server_selector,
+                                    PropertyCollectionType& properties,
+                                    Args... input) const {
+        if (backend_selector.amUnspecified()) {
+            for (auto backend : backends_) {
+                properties = ((*backend).*MethodPointer)(server_selector, input...);
+                if (!properties.empty()) {
+                    break;
+                }
+            }
+
+        } else {
+            auto backends = selectBackends(backend_selector);
+            if (!backends.empty()) {
+                for (auto backend : backends) {
+                    properties = ((*backend).*MethodPointer)(server_selector, input...);
+                    if (!properties.empty()) {
+                        break;
+                    }
+                }
+
+            } else {
+                isc_throw(db::NoSuchDatabase, "no such database found for selector: "
+                          << backend_selector.toText());
+            }
+        }
+    }
+
+    /// @brief Retrieve all configuration properties from the pool.
+    ///
+    /// This is a common method for retrieving all configuration properties
+    /// from the databases. The server specific backends call this method
+    /// to retrieve all objects of the same type. For example, the DHCPv4
+    /// configuration backend pool may use this function to implement a
+    /// @c getAllSubnets4 method:
+    ///
+    /// @code
+    /// Subnet4Collection getAllSubnets4(const BackendSelector&, const ServerSelector&) const {
+    ///     Subnet4Collection subnets;
+    ///     getAllPropertiesConst<Subnet6Collection>
+    ///         (&ConfigBackendDHCPv4::getAllSubnets4, subnets, backend_selector,
+    ///          server_selector);
+    ///     return (subnets);
+    /// }
+    /// @endcode
+    ///
+    /// where @c ConfigBackendDHCPv4::getAllSubnets4 has the following signature:
+    ///
+    /// @code
+    /// Subnet4Collection getAllSubnets4(const ServerSelector&) const;
+    /// @endcode
+    ///
+    /// If the backend selector is set to "unspecified", this method will iterate
+    /// over existing backends and call the @c MethodPointer method on each
+    /// backend. It will return the first non-empty list returned by one of the
+    /// backends.
+    ///
+    /// @tparam PropertyCollectionType Type of the container into which the
+    /// properties are stored.
+    ///
+    /// @param MethodPointer Pointer to the backend method to be called.
+    /// @param backend_selector Backend selector.
+    /// @param server_selector Server selector.
+    /// @param [out] properties Reference to the collection of retrieved properties.
+    ///
+    /// @throw db::NoSuchDatabase if no database matching the given selector
+    /// was found.
+    template<typename PropertyCollectionType>
+    void getAllPropertiesConst(PropertyCollectionType (ConfigBackendType::*MethodPointer)
+                               (const db::ServerSelector&) const,
+                               const db::BackendSelector& backend_selector,
+                               const db::ServerSelector& server_selector,
+                               PropertyCollectionType& properties) const {
+        if (backend_selector.amUnspecified()) {
+            for (auto backend : backends_) {
+                properties = ((*backend).*MethodPointer)(server_selector);
+                if (!properties.empty()) {
+                    break;
+                }
+            }
+
+        } else {
+            auto backends = selectBackends(backend_selector);
+            if (!backends.empty()) {
+                for (auto backend : backends) {
+                    properties = ((*backend).*MethodPointer)(server_selector);
+                    if (!properties.empty()) {
+                        break;
+                    }
+                }
+
+            } else {
+                isc_throw(db::NoSuchDatabase, "no such database found for selector: "
+                          << backend_selector.toText());
+            }
+        }
+    }
+
+    /// @brief Get all configuration properties from the backend.
+    ///
+    /// This is a common method for retrieving all configuration properties
+    /// from the selected database without specifying the server selector. The
+    /// server specific backends call this method to retrieve all objects of
+    /// the same type. For example, the DHCPv4 configuration backend pool may
+    /// use this function to implement a @c getAllServers4 method:
+    ///
+    /// @code
+    /// ServerCollection getAllServers4(const BackendSelector&) const {
+    ///     ServerCollection servers;
+    ///     getAllBackendPropertiesConst<ServerCollection>
+    ///         (&ConfigBackendDHCPv4::getAllServers4, backend_selector, servers);
+    ///     return (servers);
+    /// }
+    /// @endcode
+    ///
+    /// where @c ConfigBackendDHCPv4::getAllServers4 has the following signature:
+    ///
+    /// @code
+    /// ServerCollection getAllServers4() const;
+    /// @endcode
+    ///
+    /// This method is used in cases when server selector is not applicable.
+    ///
+    /// @tparam PropertyCollectionType Type of the container into which the
+    /// properties are stored.
+    ///
+    /// @param MethodPointer Pointer to the backend method to be called.
+    /// @param backend_selector Backend selector.
+    /// @param [out] properties Reference to the collection of retrieved properties.
+    ///
+    /// @throw db::NoSuchDatabase if no database matching the given selector
+    /// was found.
+    /// @throw db::AmbiguousDatabase if multiple databases matching the selector
+    /// were found.
+    template<typename PropertyCollectionType>
+    void getAllBackendPropertiesConst(PropertyCollectionType (ConfigBackendType::*MethodPointer)() const,
+                                      const db::BackendSelector& backend_selector,
+                                      PropertyCollectionType& properties) const {
+        auto backends = selectBackends(backend_selector);
+        if (backends.empty()) {
+            isc_throw(db::NoSuchDatabase, "no such database found for selector: "
+                      << backend_selector.toText());
+
+        } else if (backends.size() > 1) {
+            isc_throw(db::AmbiguousDatabase, "more than one database found for "
+                      "selector: " << backend_selector.toText());
+        }
+
+        properties = (*(*(backends.begin())).*MethodPointer)();
+    }
+
+    /// @brief Add, update or delete property from the backend.
+    ///
+    /// This is a common method for storing a single configuration property in
+    /// a database, updating an existing property or deleting the property.
+    /// The server specific backends call this method. For example,
+    /// the DHCPv6 configuration backend pool may use this function to implement
+    /// a @c createUpdateSubnet6 method:
+    ///
+    /// @code
+    /// void createUpdateSubnet6(const Subnet6Ptr& subnet,
+    ///                          const BackendSelector& backend_selector,
+    ///                          const ServerSelector& server_selector) {
+    ///     createUpdateDeleteProperty<void, const Subnet6Ptr&>
+    ///         (&ConfigBackendDHCPv6::createUpdateSubnet6, backend_selector,
+    ///          server_selector, subnet, selector);
+    /// }
+    /// @endcode
+    ///
+    /// where @c ConfigBackendDHCPv6::createUpdateSubnet6 has the following
+    /// signature:
+    ///
+    /// @code
+    /// void createUpdateSubnet6(const ServerSelector&, const Subnet6Ptr&);
+    /// @endcode
+    ///
+    /// The backend selector must point to exactly one backend. If more than one
+    /// backend is selected, an exception is thrown. If no backend is selected
+    /// an exception is thrown either.
+    ///
+    /// @tparam ReturnValue Returned value, typically void or uint64_t.
+    /// @tparam FnPtrArgs Parameter pack holding argument types of the backend
+    /// method to be invoked.
+    /// @tparam Args Parameter pack holding types of the arguments provided
+    /// in the call to this method.
+    ///
+    /// @param MethodPointer Pointer to the backend method to be called.
+    /// @param backend_selector Backend selector.
+    /// @param server_selector Server selector.
+    /// @param input Objects used as arguments to the backend method to be
+    /// called.
+    ///
+    /// @throw db::NoSuchDatabase if no database matching the given selector
+    /// was found.
+    /// @throw db::AmbiguousDatabase if multiple databases matching the selector
+    /// were found.
+    /// @return Number of affected properties, if the value is non void.
+    template<typename ReturnValue, typename... FnPtrArgs, typename... Args>
+    ReturnValue createUpdateDeleteProperty(ReturnValue (ConfigBackendType::*MethodPointer)
+                                           (const db::ServerSelector&, FnPtrArgs...),
+                                           const db::BackendSelector& backend_selector,
+                                           const db::ServerSelector& server_selector,
+                                           Args... input) {
+        auto backends = selectBackends(backend_selector);
+        if (backends.empty()) {
+            isc_throw(db::NoSuchDatabase, "no such database found for selector: "
+                      << backend_selector.toText());
+
+        } else if (backends.size() > 1) {
+            isc_throw(db::AmbiguousDatabase, "more than one database found for "
+                      "selector: " << backend_selector.toText());
+        }
+
+        return ((*(*(backends.begin())).*MethodPointer)(server_selector, input...));
+    }
+
+    /// @brief Add, update or delete property from the backend.
+    ///
+    /// This is a common method for storing a single configuration property in
+    /// a database, updating an existing property or deleting the property
+    /// without specifying the server selector. The server specific backends
+    /// call this method. For example, the DHCPv4 configuration backend pool
+    /// may use this function to implement the @c createUpdateServer4 method:
+    ///
+    /// @code
+    /// void createUpdateServer4(const BackendSelector& backend_selector,
+    ///                          const ServerSelector& server_selector,
+    ///                          const ServerPtr& server) {
+    ///     createUpdateDeleteBackendProperty<void, const ServerPtr&>
+    ///         (&ConfigBackendDHCPv4::createUpdateServer4, backend_selector,
+    ///          server);
+    /// }
+    /// @endcode
+    ///
+    /// where @c ConfigBackendDHCPv4::createUpdateServer4 has the following
+    /// signature:
+    ///
+    /// @code
+    /// void createUpdateServer4(const ServerPtr&);
+    /// @endcode
+    ///
+    /// This method is used in cases when server selector is not applicable.
+    ///
+    /// @tparam ReturnValue Returned value, typically void or uint64_t.
+    /// @tparam FnPtrArgs Parameter pack holding argument types of the backend
+    /// method to be invoked.
+    /// @tparam Args Parameter pack holding types of the arguments provided
+    /// in the call to this method.
+    ///
+    /// @param MethodPointer Pointer to the backend method to be called.
+    /// @param backend_selector Backend selector.
+    /// @param input Objects used as arguments to the backend method to be
+    /// called.
+    ///
+    /// @throw db::NoSuchDatabase if no database matching the given selector
+    /// was found.
+    /// @throw db::AmbiguousDatabase if multiple databases matching the selector
+    /// were found.
+    /// @return Number of affected properties, if the value is non void.
+    template<typename ReturnValue, typename... FnPtrArgs, typename... Args>
+    ReturnValue createUpdateDeleteBackendProperty(ReturnValue (ConfigBackendType::*MethodPointer)
+                                                  (FnPtrArgs...),
+                                                  const db::BackendSelector& backend_selector,
+                                                  Args... input) {
+        auto backends = selectBackends(backend_selector);
+        if (backends.empty()) {
+            isc_throw(db::NoSuchDatabase, "no such database found for selector: "
+                      << backend_selector.toText());
+
+        } else if (backends.size() > 1) {
+            isc_throw(db::AmbiguousDatabase, "more than one database found for "
+                      "selector: " << backend_selector.toText());
+        }
+
+        return ((*(*(backends.begin())).*MethodPointer)(input...));
+    }
+
+    /// @brief Selects existing backends matching the selector.
+    ///
+    /// This method selects backends matching the selector. If the selector is
+    /// "unspecified" or there is no backend in the pool, an empty list is returned.
+    ///
+    /// @param backend_selector Selector for which matching backends should be selected.
+    std::list<ConfigBackendTypePtr>
+    selectBackends(const db::BackendSelector& backend_selector) const {
+
+        std::list<ConfigBackendTypePtr> selected;
+
+        // In case there is only one backend and the caller hasn't specified
+        // any particular backend, simply return it.
+        if ((backends_.size() == 1) && backend_selector.amUnspecified()) {
+            selected.push_back(*backends_.begin());
+            return (selected);
+        }
+
+        // For other cases we return empty list.
+        if (backends_.empty() || backend_selector.amUnspecified()) {
+            return (selected);
+        }
+
+        // Go over all backends.
+        for (auto backend : backends_) {
+            // If backend type is specified and it is not matching,
+            // do not select this backend.
+            if ((backend_selector.getBackendType() != db::BackendSelector::Type::UNSPEC) &&
+                (backend_selector.getBackendType() !=
+                 db::BackendSelector::stringToBackendType(backend->getType()))) {
+                continue;
+            }
+
+            // If the host has been specified by the backend's host is not
+            // matching, do not select this backend.
+            if ((!backend_selector.getBackendHost().empty()) &&
+                (backend_selector.getBackendHost() != backend->getHost())) {
+                continue;
+            }
+
+            // If the port has been specified by the backend's port is not
+            // matching, do not select this backend.
+            if ((backend_selector.getBackendPort() != 0) &&
+                (backend_selector.getBackendPort() != backend->getPort())) {
+                continue;
+            }
+
+            // Passed all checks, so the backend is matching. Add it to the list.
+            selected.push_back(backend);
+        }
+
+        return (selected);
+    }
+
+    /// @brief Holds configuration backends belonging to the pool.
+    std::list<ConfigBackendTypePtr> backends_;
+};
+
+} // end of namespace isc::cb
+} // end of namespace isc
+
+#endif // BASE_CONFIG_BACKEND_POOL_H
diff --git a/src/lib/config_backend/constants.h b/src/lib/config_backend/constants.h
new file mode 100644
index 0000000..ba20b78
--- /dev/null
+++ b/src/lib/config_backend/constants.h
@@ -0,0 +1,88 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef CONFIG_BACKEND_CONSTANTS_H
+#define CONFIG_BACKEND_CONSTANTS_H
+
+namespace isc {
+namespace cb {
+
+/// @name Constants specifying output buffer lengths.
+///
+/// Config backends create buffers of these sizes to store
+/// fetched variable length data in them.
+///
+//@{
+constexpr unsigned long SUBNET4_PREFIX_BUF_LENGTH = 32;
+
+constexpr unsigned long SUBNET6_PREFIX_BUF_LENGTH = 64;
+
+constexpr unsigned long POOL_ADDRESS6_BUF_LENGTH = 45;
+
+constexpr unsigned long DHCP4O6_INTERFACE_BUF_LENGTH = 128;
+
+constexpr unsigned long DHCP4O6_INTERFACE_ID_BUF_LENGTH = 128;
+
+constexpr unsigned long DHCP4O6_SUBNET_BUF_LENGTH = 64;
+
+constexpr unsigned long BOOT_FILE_NAME_BUF_LENGTH = 512;
+
+constexpr unsigned long CLIENT_CLASS_BUF_LENGTH = 128;
+
+constexpr unsigned long INTERFACE_BUF_LENGTH = 128;
+
+constexpr unsigned long INTERFACE_ID_BUF_LENGTH = 128;
+
+constexpr unsigned long RELAY_BUF_LENGTH = 65536;
+
+constexpr unsigned long REQUIRE_CLIENT_CLASSES_BUF_LENGTH = 65536;
+
+constexpr unsigned long SERVER_HOSTNAME_BUF_LENGTH = 512;
+
+constexpr unsigned long SHARED_NETWORK_NAME_BUF_LENGTH = 128;
+
+constexpr unsigned long USER_CONTEXT_BUF_LENGTH = 65536;
+
+constexpr unsigned long OPTION_VALUE_BUF_LENGTH = 65536;
+
+constexpr unsigned long FORMATTED_OPTION_VALUE_BUF_LENGTH = 8192;
+
+constexpr unsigned long OPTION_SPACE_BUF_LENGTH = 128;
+
+constexpr unsigned long OPTION_NAME_BUF_LENGTH = 128;
+
+constexpr unsigned long OPTION_ENCAPSULATE_BUF_LENGTH = 128;
+
+constexpr unsigned long OPTION_RECORD_TYPES_BUF_LENGTH = 512;
+
+constexpr unsigned long GLOBAL_PARAMETER_NAME_BUF_LENGTH = 128;
+
+constexpr unsigned long GLOBAL_PARAMETER_VALUE_BUF_LENGTH = 65536;
+
+constexpr unsigned long CLIENT_CLASS_NAME_BUF_LENGTH = 128;
+
+constexpr unsigned long CLIENT_CLASS_TEST_BUF_LENGTH = 2048;
+
+constexpr unsigned long CLIENT_CLASS_SNAME_BUF_LENGTH = 128;
+
+constexpr unsigned long CLIENT_CLASS_FILENAME_BUF_LENGTH = 512;
+
+constexpr unsigned long AUDIT_ENTRY_OBJECT_TYPE_BUF_LENGTH = 256;
+
+constexpr unsigned long AUDIT_ENTRY_LOG_MESSAGE_BUF_LENGTH = 65536;
+
+constexpr unsigned long SERVER_TAG_BUF_LENGTH = 64;
+
+constexpr unsigned long SERVER_DESCRIPTION_BUF_LENGTH = 65536;
+
+constexpr unsigned long DNS_NAME_BUF_LENGTH = 255;
+
+//*}
+
+} // end of namespace isc::cb
+} // end of namespace isc
+
+#endif
diff --git a/src/lib/config_backend/tests/Makefile.am b/src/lib/config_backend/tests/Makefile.am
new file mode 100644
index 0000000..9e254b5
--- /dev/null
+++ b/src/lib/config_backend/tests/Makefile.am
@@ -0,0 +1,38 @@
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+
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+TESTS =
+if HAVE_GTEST
+TESTS += libcb_unittests
+
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diff --git a/src/lib/config_backend/tests/Makefile.in b/src/lib/config_backend/tests/Makefile.in
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+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
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+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
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+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
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+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+	@list='$(DIST_SUBDIRS)'; for subdir in $$list; do \
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+	      || test -d "$(distdir)/$$subdir" \
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+check: check-recursive
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+
+clean-generic:
+	-test -z "$(CLEANFILES)" || rm -f $(CLEANFILES)
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+
+clean-am: clean-generic clean-libtool clean-noinstPROGRAMS \
+	mostlyclean-am
+
+distclean: distclean-recursive
+		-rm -f ./$(DEPDIR)/libcb_unittests-config_backend_mgr_unittest.Po
+	-rm -f ./$(DEPDIR)/libcb_unittests-run_unittests.Po
+	-rm -f Makefile
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+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/lib/config_backend/tests/config_backend_mgr_unittest.cc b/src/lib/config_backend/tests/config_backend_mgr_unittest.cc
new file mode 100644
index 0000000..0ccc88d
--- /dev/null
+++ b/src/lib/config_backend/tests/config_backend_mgr_unittest.cc
@@ -0,0 +1,556 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <config_backend/base_config_backend_mgr.h>
+#include <config_backend/base_config_backend_pool.h>
+#include <config_backend/base_config_backend.h>
+#include <database/database_connection.h>
+#include <boost/shared_ptr.hpp>
+#include <gtest/gtest.h>
+#include <list>
+#include <string>
+#include <utility>
+
+using namespace isc;
+using namespace isc::cb;
+using namespace isc::db;
+
+namespace {
+
+/// @brief Defines list of properties retrieved by @c TestConfigBackend.
+///
+/// A single property is a name/value pair, where value is an integer.
+typedef std::list<std::pair<std::string, int> > PropertiesList;
+
+/// @brief Implements configuration backend used in tests.
+///
+/// @c BaseConfigBackend is an abstract class that must be implemented
+/// in order to allow us to test mechanisms implemented in
+/// @c BaseConfigBackendMgr and @c BaseConfigBackendPool.
+///
+/// Normally, a class derived directly from the @c BaseConfigBackend
+/// will merely provide an interface for server specific operations,
+/// e.g. DHCPv4 specific operations, and the database specific classes
+/// will implement this interface. However, for the test purposes it
+/// is convenient to implement them here and let the derivations
+/// only provide the implementations of the @c getType, @c getHost
+/// and @c getPort functions. That way, the logic for adding and
+/// retrieving the data from the backend is implemented only once and
+/// is common accross all test backends.
+///
+/// This class provides a logic for managing test data being a collection
+/// of name/value pairs, i.e. "properties". It contains a list of
+/// properties and the functions for adding the properties, retrieving
+/// a single property and retrieving a collection of properties.
+class TestConfigBackend : public BaseConfigBackend {
+public:
+
+    /// @brief Retrieves first property having a given name.
+    ///
+    /// @param property_name Name of the property to be retrieved.
+    /// @return Value of the property or 0 if property doesn't exist.
+    virtual int getProperty(const ServerSelector&,
+                            const std::string& property_name) const {
+        for (auto property : properties_) {
+            if (property.first == property_name) {
+                return (property.second);
+            }
+        }
+        return (0);
+    }
+
+    /// @brief Retrieves first property matching the name and value.
+    ///
+    /// @param property_name Name of the property to be retrieved.
+    /// @param property_value Value of the property to be retrieved.
+    /// @return Value of the property or 0 if the property doesn't exist.
+    virtual int getProperty(const ServerSelector&,
+                            const std::string& property_name,
+                            const int property_value) const {
+        for (auto property : properties_) {
+            if ((property.first == property_name) &&
+                (property.second == property_value)) {
+                return (property.second);
+            }
+        }
+        return (0);
+    }
+
+    /// @brief Retrieves all properties having a given name.
+    ///
+    /// @param property_name Name of the properties to be retrieved.
+    /// @return List of the properties having a given name. This list is
+    /// empty if no property was found.
+    virtual PropertiesList getProperties(const ServerSelector&,
+                                         const std::string& property_name) const {
+        PropertiesList properties;
+        for (auto property : properties_) {
+            if (property.first == property_name) {
+                properties.push_back(property);
+            }
+        }
+        return (properties);
+    }
+
+    /// @brief Retrieves all properties.
+    ///
+    /// @return List of all properties held in the backend.
+    virtual PropertiesList getAllProperties(const ServerSelector&) const {
+        return (properties_);
+    }
+
+    /// @brief Creates new property.
+    ///
+    /// @param new_property Property to be added to the backend.
+    virtual void createProperty(const ServerSelector&,
+                                const std::pair<std::string, int>& new_property) {
+        properties_.push_back(new_property);
+    }
+
+protected:
+
+    /// @brief Holds list of properties (simulates database).
+    PropertiesList properties_;
+
+};
+
+/// @brief Shared pointer to the @c TestConfigBackend.
+typedef boost::shared_ptr<TestConfigBackend> TestConfigBackendPtr;
+
+/// @brief First implementation of the test config backend.
+///
+/// It simulates being a MySQL backend installed on the
+/// "mysql-host" host and running on port 2345.
+class TestConfigBackendImpl1 : public TestConfigBackend {
+public:
+
+    /// @brief Returns backend type.
+    ///
+    /// @return "mysql".
+    virtual std::string getType() const {
+        return (std::string("mysql"));
+    }
+
+    /// @brief Returns backend host.
+    ///
+    /// @return "mysql-host".
+    virtual std::string getHost() const {
+        return (std::string("mysql-host"));
+    }
+
+    /// @brief Returns backend port.
+    ///
+    /// @return Port number 2345.
+    virtual uint16_t getPort() const {
+        return (2345);
+    }
+
+};
+
+/// @brief Shared pointer to the @c TestConfigBackendImpl1.
+typedef boost::shared_ptr<TestConfigBackendImpl1> TestConfigBackendImpl1Ptr;
+
+/// @brief Second implementation of the test config backend.
+///
+/// It simulates being a Postgres backend installed on the
+/// "postgresql-host" host and running on port 1234.
+class TestConfigBackendImpl2 : public TestConfigBackend {
+public:
+
+    /// @brief Returns backend type.
+    ///
+    /// @return "postgresql".
+    virtual std::string getType() const {
+        return (std::string("postgresql"));
+    }
+
+    /// @brief Returns backend host.
+    ///
+    /// @return "postgresql-host".
+    virtual std::string getHost() const {
+        return (std::string("postgresql-host"));
+    }
+
+    /// @brief Returns backend port.
+    ///
+    /// @return Port number 1234.
+    virtual uint16_t getPort() const {
+        return (1234);
+    }
+};
+
+/// @brief Shared pointer to the @c TestConfigBackendImpl2.
+typedef boost::shared_ptr<TestConfigBackendImpl2> TestConfigBackendImpl2Ptr;
+
+/// @brief Implements test pool of configuration backends.
+///
+/// @c BaseConfigBackendPool template provides mechanics for managing the data
+/// stored in multiple backends. Server specific pools must extend this class
+/// with methods for managing the data appropriate for the server types.
+/// This class provides an example pool implementation for managing the
+/// "properties" being name/value pairs. It extends the base class with
+/// new methods to retrieve a single property and multiple properties. It
+/// also adds a method to create new property. Those methods correspond to
+/// the ones implemented in the @c TestConfigBackend, but also each of
+/// them includes a "database selector" used to indicate the backend to
+/// be used.
+class TestConfigBackendPool : public BaseConfigBackendPool<TestConfigBackend> {
+public:
+
+    /// @brief Retrieves a value of the property.
+    ///
+    /// @param property_name Name of the property which value should be returned.
+    /// @param backend_selector Backend selector. The default value of the selector
+    /// is @c UNSPEC which means that the property will be searched in all backends
+    /// and the first value found will be returned.
+    /// @param server_selector Server selector. The default value is set to @c ALL,
+    /// which means that the property for all servers will be returned.
+    virtual int getProperty(const std::string& property_name,
+                            const BackendSelector& backend_selector =
+                            BackendSelector::UNSPEC(),
+                            const ServerSelector& server_selector =
+                            ServerSelector::ALL()) const {
+        int property;
+
+        // If the selector is specified, this method will pick the appropriate
+        // backend and will call getProperty method on this backend. If the
+        // selector is not specified, this method will iterate over existing
+        // backends and call getProperty on them. It will return after finding
+        // the first non-zero value of the property. For example, if the first
+        // backend contains a non-zero value this value will be returned and
+        // the value held in the second backend (if any) won't be fetched.
+        // The template arguments specify the returned value type and the
+        // argument of the getProperty method.
+        getPropertyPtrConst<int, const std::string&>
+            (&TestConfigBackend::getProperty, backend_selector, server_selector,
+             property, property_name);
+        return (property);
+    }
+
+    /// @brief Retrieves value of the property.
+    ///
+    /// @param property_name Name of the property which value should be returned.
+    /// @param property_value Value of the property to be retrieved.
+    /// @param backend_selector Backend selector. The default value of the selector
+    /// is @c UNSPEC which means that the property will be searched in all backends
+    /// and the first value found will be returned.
+    /// @param server_selector Server selector. The default value is set to @c ALL,
+    /// which means that the property for all servers will be returned.
+    virtual int getProperty(const std::string& property_name,
+                            const int property_value,
+                            const BackendSelector& backend_selector =
+                            BackendSelector::UNSPEC(),
+                            const ServerSelector& server_selector =
+                            ServerSelector::ALL()) const {
+        int property;
+        getPropertyPtrConst<int, const std::string&, int>
+            (&TestConfigBackend::getProperty, backend_selector, server_selector,
+             property, property_name, property_value);
+        return (property);
+    }
+
+
+    /// @brief Retrieves multiple properties.
+    ///
+    /// @param property_name Name of the properties which should be retrieved.
+    /// @param backend_selector Backend selector. The default value of the selector
+    /// is @c UNSPEC which means that the properties will be searched in all
+    /// backends and the first non-empty list will be returned.
+    /// @param server_selector Server selector. The default value is set to @c ALL,
+    /// which means that the properties for all servers will be returned.
+    virtual PropertiesList getProperties(const std::string& property_name,
+                                         const BackendSelector& backend_selector =
+                                         BackendSelector::UNSPEC(),
+                                         const ServerSelector& server_selector =
+                                         ServerSelector::ALL()) const {
+        PropertiesList properties;
+
+        // If the selector is specified, this method will pick the appropriate
+        // backend and will call getProperties method on this backend. If the
+        // selector is not specified, this method will iterate over existing
+        // backends and call getProperties on them. It will return after finding
+        // the first non-empty list of properties in one of the backends.
+        // The template arguments specify the type of the list of properties
+        // and the argument of the getProperties method.
+        getMultiplePropertiesConst<PropertiesList, const std::string&>
+            (&TestConfigBackend::getProperties, backend_selector, server_selector,
+             properties, property_name);
+        return (properties);
+    }
+
+    /// @brief Retrieves all properties.
+    ///
+    /// @param backend_selector Backend selector. The default value of the selector
+    /// is @c UNSPEC which means that the properties will be searched in all
+    /// backends and the first non-empty list will be returned.
+    /// @param server_selector Server selector. The default value is set to @c ALL,
+    /// which means that the properties for all servers will be returned.
+    virtual PropertiesList getAllProperties(const BackendSelector& backend_selector =
+                                            BackendSelector::UNSPEC(),
+                                            const ServerSelector& server_selector =
+                                            ServerSelector::ALL()) const {
+        PropertiesList properties;
+
+        // This method is similar to getMultiplePropertiesConst but it lacks
+        // an argument and it simply returns all properties.
+        getAllPropertiesConst<PropertiesList>
+            (&TestConfigBackend::getAllProperties, backend_selector, server_selector,
+             properties);
+        return (properties);
+    }
+
+    /// @brief Creates new property in a selected backend.
+    ///
+    /// @param new_property New property to be added to a backend.
+    /// @param backend_selector Backend selector. It has no default value.
+    /// @param server_selector The default value is @c ALL which means that
+    /// new property is going to be shared by all servers.
+    virtual void createProperty(const std::pair<std::string, int>& new_property,
+                                const BackendSelector& backend_selector,
+                                const ServerSelector& server_selector =
+                                ServerSelector::ALL()) {
+        createUpdateDeleteProperty<void, const std::pair<std::string, int>&>
+            (&TestConfigBackend::createProperty, backend_selector, server_selector,
+             new_property);
+    }
+};
+
+using TestConfigBackendMgr = BaseConfigBackendMgr<TestConfigBackendPool>;
+
+/// @brief Test fixture class for testing @c ConfigBackendMgr.
+class ConfigBackendMgrTest : public ::testing::Test {
+public:
+
+    /// @brief Constructor.
+    ConfigBackendMgrTest()
+        : config_mgr_() {
+    }
+
+    /// @brief Destructor.
+    ///
+    /// Removes backend instances.
+    ~ConfigBackendMgrTest() {
+        config_mgr_.delAllBackends();
+    }
+
+    /// @brief Creates example database backend called "mysql".
+    ///
+    /// It uses @c TestConfigBackendImpl1.
+    void addTestMySQLBackend() {
+        config_mgr_.registerBackendFactory("mysql", [](const DatabaseConnection::ParameterMap&)
+                                          -> TestConfigBackendPtr {
+            return (TestConfigBackendImpl1Ptr(new TestConfigBackendImpl1()));
+        });
+
+        config_mgr_.addBackend("type=mysql");
+    }
+
+    /// @brief Creates example database backend called "postgresql".
+    ///
+    /// It uses @c TestConfigBackendImpl2.
+    void addTestPgSQLBackend() {
+        config_mgr_.registerBackendFactory("postgresql", [](const DatabaseConnection::ParameterMap&)
+                                          -> TestConfigBackendPtr {
+            return (TestConfigBackendImpl2Ptr(new TestConfigBackendImpl2()));
+        });
+
+        // Actually create the backends.
+        config_mgr_.addBackend("type=postgresql");
+    }
+
+    /// @brief Creates two example database backends called "mysql" and "postgresql".
+    ///
+    /// It uses @c TestConfigBackendImpl1 and @c TestConfigBackendImpl2.
+    void addTestBackends() {
+        addTestMySQLBackend();
+        addTestPgSQLBackend();
+    }
+
+    /// @brief Adds test data into the backends.
+    void addTestData() {
+        // Add two properties with different names into the first backend.
+        config_mgr_.getPool()->createProperty(std::make_pair("dogs", 1),
+                                             BackendSelector(BackendSelector::Type::MYSQL));
+        config_mgr_.getPool()->createProperty(std::make_pair("wolves", 3),
+                                             BackendSelector(BackendSelector::Type::MYSQL));
+
+        // Add two properties into the second backend. Both properties share the
+        // name so as we can test retrieving multiple records from the same backend.
+        config_mgr_.getPool()->createProperty(std::make_pair("cats", 2),
+                                             BackendSelector(BackendSelector::Type::POSTGRESQL));
+        config_mgr_.getPool()->createProperty(std::make_pair("cats", 4),
+                                             BackendSelector(BackendSelector::Type::POSTGRESQL));
+    }
+
+    /// Instance of the test configuration manager.
+    TestConfigBackendMgr config_mgr_;
+};
+
+// Test that selector can be left "unspecified" if there is only one backend,
+// when manipulating the data.
+TEST_F(ConfigBackendMgrTest, createPropertySingleBackendUnspec) {
+    addTestMySQLBackend();
+
+    ASSERT_NO_THROW(
+        config_mgr_.getPool()->createProperty(std::make_pair("dogs", 1),
+                                              BackendSelector(BackendSelector::Type::UNSPEC))
+    );
+
+    // We should be able to retrieve stored value without having to specify
+    // the backend.
+    EXPECT_EQ(1, config_mgr_.getPool()->getProperty("dogs"));
+}
+
+// Test that selector must be specified if there is more than one backend,
+// when manipulating the data.
+TEST_F(ConfigBackendMgrTest, createPropertyTwoBackendsUnspec) {
+    addTestBackends();
+
+    // Backend must be selected if there is more than one backend present.
+    EXPECT_THROW(
+        config_mgr_.getPool()->createProperty(std::make_pair("dogs", 1),
+                                              BackendSelector(BackendSelector::Type::UNSPEC)),
+        NoSuchDatabase
+    );
+}
+
+// Test that exception is thrown when multiple backends are selected.
+TEST_F(ConfigBackendMgrTest, createPropertyAmbiguousSelection) {
+    addTestBackends();
+
+    // Add another MySQL backend to cause the selection to give ambiguous
+    // result.
+    config_mgr_.addBackend("type=mysql");
+
+    EXPECT_THROW(
+        config_mgr_.getPool()->createProperty(std::make_pair("dogs", 1),
+                                              BackendSelector(BackendSelector::Type::MYSQL)),
+        AmbiguousDatabase
+    );
+}
+
+// Test that a single property can be retrieved from a selected backend.
+TEST_F(ConfigBackendMgrTest, getSingleProperty) {
+
+    addTestBackends();
+    addTestData();
+
+    // Backend is not specified, so it should find the dogs in first one and
+    // cats in the second one.
+    EXPECT_EQ(1, config_mgr_.getPool()->getProperty("dogs"));
+    EXPECT_EQ(2, config_mgr_.getPool()->getProperty("cats"));
+
+    // No dogs in the postgresql backend and no cats in mysql backend.
+    EXPECT_EQ(0, config_mgr_.getPool()->getProperty("dogs",
+                                                   BackendSelector(BackendSelector::Type::POSTGRESQL)));
+    EXPECT_EQ(0, config_mgr_.getPool()->getProperty("cats",
+                                                   BackendSelector(BackendSelector::Type::MYSQL)));
+
+    // If the selectors are pointing to the right databases, the dogs and cats
+    // should be returned properly.
+    EXPECT_EQ(1, config_mgr_.getPool()->getProperty("dogs",
+                                                   BackendSelector(BackendSelector::Type::MYSQL)));
+    EXPECT_EQ(2, config_mgr_.getPool()->getProperty("cats",
+                                                   BackendSelector(BackendSelector::Type::POSTGRESQL)));
+
+    // Also make sure that the variant of getProperty function taking two arguments
+    // would return the value.
+    EXPECT_EQ(1, config_mgr_.getPool()->getProperty("dogs", 1,
+                                                   BackendSelector(BackendSelector::Type::MYSQL)));
+
+    // If the value is not matching it should return 0.
+    EXPECT_EQ(0, config_mgr_.getPool()->getProperty("dogs", 2,
+                                                   BackendSelector(BackendSelector::Type::MYSQL)));
+
+    // Try to use the backend that is not present.
+    EXPECT_THROW(config_mgr_.getPool()->getProperty("cats",
+                                                    BackendSelector(static_cast<BackendSelector::Type>(-1))),
+                 NoSuchDatabase);
+}
+
+// Test that multiple properties can be retrieved with filtering.
+TEST_F(ConfigBackendMgrTest, getMultipleProperties) {
+
+    addTestBackends();
+    addTestData();
+
+    // There is one dogs entry in mysql.
+    PropertiesList mysql_list =
+        config_mgr_.getPool()->getProperties("dogs",
+                                            BackendSelector(BackendSelector::Type::MYSQL));
+    ASSERT_EQ(1, mysql_list.size());
+
+    // There is also one wolves entry in mysql.
+    mysql_list = config_mgr_.getPool()->getProperties("wolves",
+                                                     BackendSelector(BackendSelector::Type::MYSQL));
+    ASSERT_EQ(1, mysql_list.size());
+
+    // There are two cats entries in postgresql.
+    PropertiesList postgresql_list =
+        config_mgr_.getPool()->getProperties("cats",
+                                            BackendSelector(BackendSelector::Type::POSTGRESQL));
+    ASSERT_EQ(2, postgresql_list.size());
+
+    // Try to use the backend that is not present.
+    EXPECT_THROW(config_mgr_.getPool()->getProperties("cats",
+                                                      BackendSelector(static_cast<BackendSelector::Type>(-1))),
+                 NoSuchDatabase);
+
+}
+
+// Test that all properties can be retrieved from each backend.
+TEST_F(ConfigBackendMgrTest, getAllProperties) {
+
+    addTestBackends();
+    addTestData();
+
+    // The mysql backend holds two entries.
+    PropertiesList mysql_list =
+        config_mgr_.getPool()->getAllProperties(BackendSelector(BackendSelector::Type::MYSQL));
+    ASSERT_EQ(2, mysql_list.size());
+
+    // The postgresql backends also holds two entries.
+    PropertiesList postgresql_list =
+        config_mgr_.getPool()->getAllProperties(BackendSelector(BackendSelector::Type::POSTGRESQL));
+    ASSERT_EQ(2, postgresql_list.size());
+
+    // Try to use the backend that is not present.
+    EXPECT_THROW(config_mgr_.getPool()->getProperties("cats",
+                                                      BackendSelector(static_cast<BackendSelector::Type>(-1))),
+                 NoSuchDatabase);
+}
+
+// Verify that unregistering a factory works.
+TEST_F(ConfigBackendMgrTest, unregister) {
+
+    // Verify we can't remove what is not there.
+    ASSERT_FALSE(config_mgr_.unregisterBackendFactory("mysql"));
+
+    // Add both MySQL and Postgresql backends
+    addTestBackends();
+
+    // Backend should be present.
+    EXPECT_NO_THROW(config_mgr_.getPool()->getProperties("cats",
+                                                         BackendSelector(BackendSelector::Type::MYSQL)));
+
+    // Verify that unregistering MySQL factory returns true.
+    ASSERT_TRUE(config_mgr_.unregisterBackendFactory("mysql"));
+
+    // Verify that the factory is actually gone.
+    ASSERT_THROW(config_mgr_.addBackend("type=mysql"), db::InvalidType);
+
+    // Verify we can't remove what is not there.
+    ASSERT_FALSE(config_mgr_.unregisterBackendFactory("mysql"));
+
+    // Try to use the backend that is not present.
+    EXPECT_THROW(config_mgr_.getPool()->getProperties("cats",
+                                                       BackendSelector(BackendSelector::Type::MYSQL)),
+                 NoSuchDatabase);
+}
+
+}
diff --git a/src/lib/config_backend/tests/run_unittests.cc b/src/lib/config_backend/tests/run_unittests.cc
new file mode 100644
index 0000000..6754d66
--- /dev/null
+++ b/src/lib/config_backend/tests/run_unittests.cc
@@ -0,0 +1,19 @@
+// Copyright (C) 2018 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <log/logger_support.h>
+#include <gtest/gtest.h>
+
+int
+main(int argc, char* argv[]) {
+    ::testing::InitGoogleTest(&argc, argv);
+
+    int result = RUN_ALL_TESTS();
+
+    return (result);
+}