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diff --git a/src/lib/dhcpsrv/cache_host_data_source.h b/src/lib/dhcpsrv/cache_host_data_source.h
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+++ b/src/lib/dhcpsrv/cache_host_data_source.h
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+// Copyright (C) 2018-2020 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 CACHE_HOST_DATA_SOURCE_H
+#define CACHE_HOST_DATA_SOURCE_H
+
+#include <dhcpsrv/base_host_data_source.h>
+
+namespace isc {
+namespace dhcp {
+
+/// @brief Abstract interface extending base simple data source for host
+/// reservations to host cache.
+/// Only the insert() method is required to use the cache.
+class CacheHostDataSource : public virtual BaseHostDataSource {
+public:
+
+    /// @brief Default destructor implementation.
+    virtual ~CacheHostDataSource() { }
+
+    /// @brief Insert a host into the cache.
+    ///
+    /// Similar to @c add() but with a different purpose.
+    ///
+    /// @param host Pointer to the new @c Host object being inserted.
+    /// @param overwrite false if doing nothing in case of conflicts
+    /// (and returning 1), true if removing conflicting entries
+    /// (and returning their number).
+    /// @return number of conflicts limited to one if overwrite is false.
+    virtual size_t insert(const ConstHostPtr& host, bool overwrite) = 0;
+
+    /// @brief Remove a host from the cache.
+    ///
+    /// Does the same as @c del, @c del4 or @c del6 but with
+    /// a more uniform interface and a different purpose.
+    ///
+    /// @note A pointer to a copy does not remove the object.
+    ///
+    /// @param host Pointer to the existing @c Host object being removed.
+    /// @return true when found and removed.
+    virtual bool remove(const HostPtr& host) = 0;
+
+    /// @brief Flush entries.
+    ///
+    /// @param count number of entries to remove, 0 means all.
+    virtual void flush(size_t count) = 0;
+
+    /// @brief Return the number of entries.
+    ///
+    /// @return the current number of active entries in the cache.
+    virtual size_t size() const = 0;
+
+    /// @brief Return the maximum number of entries.
+    ///
+    /// @return the maximum number of entries, 0 means unbound.
+    virtual size_t capacity() const = 0;
+};
+
+/// @brief CacheHostDataSource pointer.
+typedef boost::shared_ptr<CacheHostDataSource> CacheHostDataSourcePtr;
+
+} // end of namespace isc::dhcp
+} // end of namespace isc
+
+#endif // CACHE_HOST_DATA_SOURCE_H