148 lines
3.8 KiB
C++
148 lines
3.8 KiB
C++
/*
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* Copyright (c) 2018 MariaDB Corporation Ab
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file and at www.mariadb.com/bsl11.
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*
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* Change Date: 2022-01-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2 or later of the General
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* Public License.
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*/
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#pragma once
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#include <maxscale/ccdefs.hh>
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#include <list>
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#include <mutex>
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#include <string>
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#include <unordered_map>
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#include <maxscale/service.h>
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using namespace maxscale;
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/** This contains the database to server mapping */
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typedef std::unordered_map<std::string, SERVER*> ServerMap;
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typedef std::unordered_map<uint64_t, SERVER*> BinaryPSMap;
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typedef std::unordered_map<uint32_t, uint32_t> PSHandleMap;
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class Shard
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{
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public:
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Shard();
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~Shard();
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/**
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* @brief Add a database location
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*
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* @param db Database to add
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* @param target Target where database is located
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*
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* @return True if location was added
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*/
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bool add_location(std::string db, SERVER* target);
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/**
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* @brief Retrieve the location of a database
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*
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* @param db Database to locate
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*
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* @return The database or NULL if no server contains the database
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*/
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SERVER* get_location(std::string db);
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void add_statement(std::string stmt, SERVER* target);
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void add_statement(uint32_t id, SERVER* target);
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void add_ps_handle(uint32_t id, uint32_t handle);
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uint32_t get_ps_handle(uint32_t id);
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bool remove_ps_handle(uint32_t id);
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SERVER* get_statement(std::string stmt);
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SERVER* get_statement(uint32_t id);
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bool remove_statement(std::string stmt);
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bool remove_statement(uint32_t id);
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/**
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* @brief Change the location of a database
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*
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* @param db Database to relocate
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* @param target Target where database is relocated to
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*/
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void replace_location(std::string db, SERVER* target);
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/**
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* @brief Check if shard contains stale information
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*
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* @param max_interval The maximum lifetime of the shard
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*
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* @return True if the shard is stale
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*/
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bool stale(double max_interval) const;
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/**
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* @brief Check if shard is empty
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*
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* @return True if shard contains no locations
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*/
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bool empty() const;
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/**
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* @brief Retrieve all database to server mappings
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*
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* @param keys A map where the database to server mappings are added
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*/
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void get_content(ServerMap& dest);
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/**
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* @brief Check if this shard is newer than the other shard
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*
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* @param shard The other shard to check
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*
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* @return True if this shard is newer
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*/
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bool newer_than(const Shard& shard) const;
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private:
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ServerMap m_map;
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ServerMap stmt_map;
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BinaryPSMap m_binary_map;
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PSHandleMap m_ps_handles;
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time_t m_last_updated;
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};
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typedef std::unordered_map<std::string, Shard> ShardMap;
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class ShardManager
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{
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public:
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ShardManager();
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~ShardManager();
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/**
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* @brief Retrieve or create a shard
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*
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* @param user User whose shard to retrieve
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* @param max_lifetime The maximum lifetime of a shard
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*
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* @return The latest version of the shard or a newly created shard if no
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* old version is available
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*/
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Shard get_shard(std::string user, double max_lifetime);
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/**
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* @brief Update the shard information
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*
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* The shard information is updated if the new shard contains more up to date
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* information than the one stored in the shard manager.
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*
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* @param shard New version of the shard
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* @param user The user whose shard this is
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*/
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void update_shard(Shard& shard, std::string user);
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private:
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mutable std::mutex m_lock;
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ShardMap m_maps;
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};
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