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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
#pragma once
#include <map>
#include <stdexcept>
#include <string>
#include <vector>
#include "rocksdb/configurable.h"
#include "rocksdb/convenience.h"
namespace ROCKSDB_NAMESPACE {
// Helper class defining static methods for supporting the Configurable
// class. The purpose of this class is to keep the Configurable class
// as tight as possible and provide methods for doing the actual work
// of configuring the objects.
class ConfigurableHelper {
public:
// Configures the input Configurable object based on the parameters.
// On successful completion, the Configurable is updated with the settings
// from the opt_map.
//
// The acceptable values of the name/value pairs are documented with the
// specific class/instance.
//
// @param config_options Controls how the arguments are processed.
// @param opt_map Name/value pairs of the options to update
// @param unused If specified, this value will return the name/value
// pairs from opt_map that were NotFound for this object.
// @return OK If all values in the map were successfully updated
// @return NotFound If any of the names in the opt_map were not valid
// for this object. If unused is specified, it will contain the
// collection of NotFound entries
// @return NotSupported If any of the names are valid but the object does
// not know how to convert the value. This can happen if, for example,
// there is some nested Configurable that cannot be created.
// @return InvalidArgument If any of the values cannot be successfully
// parsed. This can also be returned if PrepareOptions encounters an
// error.
static Status ConfigureOptions(
const ConfigOptions& config_options, Configurable& configurable,
const std::unordered_map<std::string, std::string>& options,
std::unordered_map<std::string, std::string>* unused);
#ifndef ROCKSDB_LITE
// Internal method to configure a set of options for this object.
// Classes may override this value to change its behavior.
// @param config_options Controls how the options are being configured
// @param type_name The name that was registered for this set of options
// @param type_map The map of options for this name
// @param opt_ptr Pointer to the object being configured for this option set.
// @param options The option name/values being updated. On return, any
// option that was found is removed from the list.
// @return OK If all of the options were successfully updated.
// @return InvalidArgument If an option was found but the value could not
// be updated.
// @return NotFound If an option name was not found in type_mape
// @return NotSupported If the option was found but no rule for converting
// the value could be found.
static Status ConfigureSomeOptions(
const ConfigOptions& config_options, Configurable& configurable,
const std::unordered_map<std::string, OptionTypeInfo>& type_map,
std::unordered_map<std::string, std::string>* options, void* opt_ptr);
// Configures a single option in the input Configurable.
// This method will look through the set of option names for this
// Configurable searching for one with the input name. If such an option
// is found, it will be configured via the input value.
//
// @param config_options Controls how the option is being configured
// @param configurable The object to configure
// @param name For options with sub-options (like Structs or
// Configurables),
// this value may be the name of the sub-field of the option being
// updated. For example, if the option is
// "compaction_options_fifo.allow_compaction", then field name would be
// "allow_compaction". For most options, field_name and opt_name will be
// equivalent.
// @param value The new value for this option.
// @param See ConfigureOptions for the possible return values
static Status ConfigureSingleOption(const ConfigOptions& config_options,
Configurable& configurable,
const std::string& name,
const std::string& value);
// Configures the option referenced by opt_info for this configurable
// This method configures the option based on opt_info for the input
// configurable.
// @param config_options Controls how the option is being configured
// @param configurable The object to configure
// @param opt_name The full option name
// @param name For options with sub-options (like Structs or
// Configurables),
// this value may be the name of the sub-field of the option being
// updated. For example, if the option is
// "compaction_options_fifo.allow_compaction", then field name would be
// "allow_compaction". For most options, field_name and opt_name will be
// equivalent.
// @param value The new value for this option.
// @param See ConfigureOptions for the possible return values
static Status ConfigureOption(const ConfigOptions& config_options,
Configurable& configurable,
const OptionTypeInfo& opt_info,
const std::string& opt_name,
const std::string& name,
const std::string& value, void* opt_ptr);
// Returns the value of the option associated with the input name
// This method is the functional inverse of ConfigureOption
// @param config_options Controls how the value is returned
// @param configurable The object from which to get the option.
// @param name The name of the option to return a value for.
// @param value The returned value associated with the named option.
// Note that value will be only the serialized version
// of the option and not "name=value"
// @return OK If the named field was successfully updated to value.
// @return NotFound If the name is not valid for this object.
// @param InvalidArgument If the name is valid for this object but
// its value cannot be serialized.
static Status GetOption(const ConfigOptions& config_options,
const Configurable& configurable,
const std::string& name, std::string* value);
// Serializes the input Configurable into the output result.
// This is the inverse of ConfigureOptions
// @param config_options Controls how serialization happens.
// @param configurable The object to serialize
// @param prefix A prefix to add to the each option as it is serialized.
// @param result The string representation of the configurable.
// @return OK If the options for this object wer successfully serialized.
// @return InvalidArgument If one or more of the options could not be
// serialized.
static Status SerializeOptions(const ConfigOptions& config_options,
const Configurable& configurable,
const std::string& prefix,
std::string* result);
// Internal method to list the option names for this object.
// Classes may override this value to change its behavior.
// @see ListOptions for more details
static Status ListOptions(const ConfigOptions& config_options,
const Configurable& configurable,
const std::string& prefix,
std::unordered_set<std::string>* result);
// Checks to see if the two configurables are equivalent to one other.
// This method assumes that the two objects are of the same class.
// @param config_options Controls how the options are compared.
// @param this_one The object to compare to.
// @param that_one The other object being compared.
// @param mismatch If the objects do not match, this parameter contains
// the name of the option that triggered the match failure.
// @param True if the objects match, false otherwise.
static bool AreEquivalent(const ConfigOptions& config_options,
const Configurable& this_one,
const Configurable& that_one,
std::string* mismatch);
private:
// Looks for the option specified by name in the RegisteredOptions.
// This method traverses the types in the input options vector. If an entry
// matching name is found, that entry, opt_name, and pointer are returned.
// @param options The vector of options to search through
// @param name The name of the option to search for in the OptionType map
// @param opt_name If the name was found, this value is set to the option name
// associated with the input name/type.
// @param opt_ptr If the name was found, this value is set to the option
// pointer
// in the RegisteredOptions vector associated with this entry
// @return A pointer to the OptionTypeInfo from the options if found,
// nullptr if the name was not found in the input options
static const OptionTypeInfo* FindOption(
const std::vector<Configurable::RegisteredOptions>& options,
const std::string& name, std::string* opt_name, void** opt_ptr);
static Status ConfigureCustomizableOption(
const ConfigOptions& config_options, Configurable& configurable,
const OptionTypeInfo& opt_info, const std::string& opt_name,
const std::string& name, const std::string& value, void* opt_ptr);
#endif // ROCKSDB_LITE
};
} // namespace ROCKSDB_NAMESPACE
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