89f66d4484
Summary: Useful for allowing new classes to create and manage Customizable objects without using internal APIs. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8301 Reviewed By: zhichao-cao Differential Revision: D29428303 Pulled By: mrambacher fbshipit-source-id: 3d33d5197cc8379fe35b54d3d169f91f0dfe7a47
208 lines
11 KiB
C++
208 lines
11 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#pragma once
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#include <map>
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#include <stdexcept>
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#include <string>
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#include <vector>
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#include "rocksdb/configurable.h"
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#include "rocksdb/convenience.h"
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namespace ROCKSDB_NAMESPACE {
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// Helper class defining static methods for supporting the Configurable
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// class. The purpose of this class is to keep the Configurable class
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// as tight as possible and provide methods for doing the actual work
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// of configuring the objects.
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class ConfigurableHelper {
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public:
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constexpr static const char* kIdPropName = "id";
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constexpr static const char* kIdPropSuffix = ".id";
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// Configures the input Configurable object based on the parameters.
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// On successful completion, the Configurable is updated with the settings
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// from the opt_map.
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//
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// The acceptable values of the name/value pairs are documented with the
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// specific class/instance.
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//
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// @param config_options Controls how the arguments are processed.
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// @param opt_map Name/value pairs of the options to update
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// @param unused If specified, this value will return the name/value
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// pairs from opt_map that were NotFound for this object.
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// @return OK If all values in the map were successfully updated
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// @return NotFound If any of the names in the opt_map were not valid
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// for this object. If unused is specified, it will contain the
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// collection of NotFound entries
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// @return NotSupported If any of the names are valid but the object does
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// not know how to convert the value. This can happen if, for example,
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// there is some nested Configurable that cannot be created.
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// @return InvalidArgument If any of the values cannot be successfully
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// parsed. This can also be returned if PrepareOptions encounters an
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// error.
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static Status ConfigureOptions(
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const ConfigOptions& config_options, Configurable& configurable,
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const std::unordered_map<std::string, std::string>& options,
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std::unordered_map<std::string, std::string>* unused);
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// Splits the input opt_value into the ID field and the remaining options.
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// The input opt_value can be in the form of "name" or "name=value
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// [;name=value]". The first form uses the "name" as an id with no options The
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// latter form converts the input into a map of name=value pairs and sets "id"
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// to the "id" value from the map.
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// @param opt_value The value to split into id and options
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// @param id The id field from the opt_value
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// @param options The remaining name/value pairs from the opt_value
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// @param default_id If specified and there is no id field in the map, this
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// value is returned as the ID
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// @return OK if the value was converted to a map succesfully and an ID was
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// found.
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// @return InvalidArgument if the value could not be converted to a map or
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// there was or there is no id property in the map.
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static Status GetOptionsMap(
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const std::string& opt_value, const std::string& default_id,
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std::string* id, std::unordered_map<std::string, std::string>* options);
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#ifndef ROCKSDB_LITE
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// Internal method to configure a set of options for this object.
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// Classes may override this value to change its behavior.
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// @param config_options Controls how the options are being configured
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// @param type_name The name that was registered for this set of options
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// @param type_map The map of options for this name
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// @param opt_ptr Pointer to the object being configured for this option set.
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// @param options The option name/values being updated. On return, any
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// option that was found is removed from the list.
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// @return OK If all of the options were successfully updated.
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// @return InvalidArgument If an option was found but the value could not
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// be updated.
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// @return NotFound If an option name was not found in type_mape
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// @return NotSupported If the option was found but no rule for converting
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// the value could be found.
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static Status ConfigureSomeOptions(
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const ConfigOptions& config_options, Configurable& configurable,
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const std::unordered_map<std::string, OptionTypeInfo>& type_map,
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std::unordered_map<std::string, std::string>* options, void* opt_ptr);
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// Configures a single option in the input Configurable.
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// This method will look through the set of option names for this
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// Configurable searching for one with the input name. If such an option
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// is found, it will be configured via the input value.
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//
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// @param config_options Controls how the option is being configured
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// @param configurable The object to configure
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// @param name For options with sub-options (like Structs or
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// Configurables),
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// this value may be the name of the sub-field of the option being
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// updated. For example, if the option is
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// "compaction_options_fifo.allow_compaction", then field name would be
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// "allow_compaction". For most options, field_name and opt_name will be
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// equivalent.
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// @param value The new value for this option.
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// @param See ConfigureOptions for the possible return values
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static Status ConfigureSingleOption(const ConfigOptions& config_options,
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Configurable& configurable,
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const std::string& name,
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const std::string& value);
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// Configures the option referenced by opt_info for this configurable
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// This method configures the option based on opt_info for the input
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// configurable.
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// @param config_options Controls how the option is being configured
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// @param configurable The object to configure
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// @param opt_name The full option name
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// @param name For options with sub-options (like Structs or
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// Configurables),
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// this value may be the name of the sub-field of the option being
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// updated. For example, if the option is
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// "compaction_options_fifo.allow_compaction", then field name would be
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// "allow_compaction". For most options, field_name and opt_name will be
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// equivalent.
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// @param value The new value for this option.
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// @param See ConfigureOptions for the possible return values
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static Status ConfigureOption(const ConfigOptions& config_options,
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Configurable& configurable,
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const OptionTypeInfo& opt_info,
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const std::string& opt_name,
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const std::string& name,
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const std::string& value, void* opt_ptr);
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// Returns the value of the option associated with the input name
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// This method is the functional inverse of ConfigureOption
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// @param config_options Controls how the value is returned
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// @param configurable The object from which to get the option.
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// @param name The name of the option to return a value for.
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// @param value The returned value associated with the named option.
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// Note that value will be only the serialized version
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// of the option and not "name=value"
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// @return OK If the named field was successfully updated to value.
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// @return NotFound If the name is not valid for this object.
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// @param InvalidArgument If the name is valid for this object but
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// its value cannot be serialized.
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static Status GetOption(const ConfigOptions& config_options,
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const Configurable& configurable,
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const std::string& name, std::string* value);
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// Serializes the input Configurable into the output result.
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// This is the inverse of ConfigureOptions
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// @param config_options Controls how serialization happens.
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// @param configurable The object to serialize
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// @param prefix A prefix to add to the each option as it is serialized.
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// @param result The string representation of the configurable.
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// @return OK If the options for this object wer successfully serialized.
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// @return InvalidArgument If one or more of the options could not be
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// serialized.
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static Status SerializeOptions(const ConfigOptions& config_options,
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const Configurable& configurable,
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const std::string& prefix,
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std::string* result);
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// Internal method to list the option names for this object.
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// Classes may override this value to change its behavior.
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// @see ListOptions for more details
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static Status ListOptions(const ConfigOptions& config_options,
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const Configurable& configurable,
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const std::string& prefix,
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std::unordered_set<std::string>* result);
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// Checks to see if the two configurables are equivalent to one other.
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// This method assumes that the two objects are of the same class.
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// @param config_options Controls how the options are compared.
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// @param this_one The object to compare to.
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// @param that_one The other object being compared.
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// @param mismatch If the objects do not match, this parameter contains
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// the name of the option that triggered the match failure.
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// @param True if the objects match, false otherwise.
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static bool AreEquivalent(const ConfigOptions& config_options,
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const Configurable& this_one,
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const Configurable& that_one,
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std::string* mismatch);
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private:
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// Looks for the option specified by name in the RegisteredOptions.
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// This method traverses the types in the input options vector. If an entry
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// matching name is found, that entry, opt_name, and pointer are returned.
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// @param options The vector of options to search through
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// @param name The name of the option to search for in the OptionType map
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// @param opt_name If the name was found, this value is set to the option name
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// associated with the input name/type.
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// @param opt_ptr If the name was found, this value is set to the option
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// pointer
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// in the RegisteredOptions vector associated with this entry
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// @return A pointer to the OptionTypeInfo from the options if found,
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// nullptr if the name was not found in the input options
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static const OptionTypeInfo* FindOption(
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const std::vector<Configurable::RegisteredOptions>& options,
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const std::string& name, std::string* opt_name, void** opt_ptr);
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static Status ConfigureCustomizableOption(
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const ConfigOptions& config_options, Configurable& configurable,
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const OptionTypeInfo& opt_info, const std::string& opt_name,
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const std::string& name, const std::string& value, void* opt_ptr);
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#endif // ROCKSDB_LITE
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};
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} // namespace ROCKSDB_NAMESPACE
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