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https://github.com/rbock/sqlpp11.git
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Merge pull request #155 from fpark12/develop
Added a generic connection pool
This commit is contained in:
Roland Bock
192
include/sqlpp11/connection_pool.h
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192
include/sqlpp11/connection_pool.h
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/*
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* Copyright (c) 2013 - 2017, Roland Bock, Frank Park
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice, this
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* list of conditions and the following disclaimer in the documentation and/or
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* other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef SQLPP_CONNECTION_POOL_H
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#define SQLPP_CONNECTION_POOL_H
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#include <mutex>
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#include <stack>
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#include <unordered_map>
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#include <memory>
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#include <iostream>
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#include <chrono>
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#include <type_traits>
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#include <sqlpp11/exception.h>
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#include <sqlpp11/pool_connection.h>
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namespace sqlpp
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{
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namespace reconnect_policy
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{
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struct auto_reconnect {
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template<typename Connection>
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void operator()(Connection* connection)
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{
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if(!connection->is_valid())
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connection->reconnect()
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}
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template<typename Connection>
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void clean(Connection* connection) {}
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};
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using namespace std::chrono_literals;
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class periodic_reconnect
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{
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private:
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std::chrono::seconds revalidate_after;
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std::unordered_map<void*,std::chrono::time_point<std::chrono::system_clock> > last_checked;
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public:
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periodic_reconnect(const std::chrono::seconds r = 28800s) //default wait_timeout in MySQL
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: revalidate_after(r), last_checked() {}
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template<typename Connection>
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void operator()(Connection* con)
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{
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auto last = last_checked.find(con);
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auto now = std::chrono::system_clock::now();
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if(last == last_checked.end())
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{
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if (!con->is_valid())
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{
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con->reconnect();
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}
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last_checked.emplace_hint(last, con, now);
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}
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else if(now - last->second > revalidate_after)
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{
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if (!con->is_valid())
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{
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con->reconnect();
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}
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last = now;
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}
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}
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template<typename Connection>
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void clean(Connection* con) {
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auto itr = last_checked.find(con);
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if(itr != last_checked.end())
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{
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last_checked.erase(itr);
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}
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}
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};
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struct never_reconnect {
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template<typename Connection>
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void operator()(Connection*) {}
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template<typename Connection>
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void clean(Connection*) {}
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};
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}
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template <typename Connection_config,
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typename Reconnect_policy = reconnect_policy::auto_reconnect,
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typename Connection = typename std::enable_if<std::is_class<Connection_config::connection>::value, Connection_config::connection>::type>
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class connection_pool
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{
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friend pool_connection<Connection_config, Reconnect_policy, Connection>;
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private:
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std::mutex connection_pool_mutex;
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const std::shared_ptr<Connection_config> config;
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size_t maximum_pool_size = 0;
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std::stack<std::unique_ptr<Connection>> free_connections;
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Reconnect_policy reconnect_policy;
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void free_connection(std::unique_ptr<Connection>& connection)
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{
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std::lock_guard<std::mutex> lock(connection_pool_mutex);
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if (free_connections.size() >= maximum_pool_size)
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{
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// Exceeds default size, do nothign and let connection self destroy.
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}
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else
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{
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if (connection.get())
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{
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if (connection->is_valid())
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{
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free_connections.push(std::move(connection));
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}
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else
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{
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throw sqlpp::exception("Trying to free a connection with incompatible config.");
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}
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}
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else
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{
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throw sqlpp::exception("Trying to free an empty connection.");
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}
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}
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}
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public:
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connection_pool(const std::shared_ptr<Connection_config>& config, size_t pool_size)
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: config(config), maximum_pool_size(pool_size), reconnect_policy(Reconnect_policy()) {}
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~connection_pool() = default;
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connection_pool(const connection_pool&) = delete;
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connection_pool(connection_pool&& other)
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: config(std::move(other.config)), maximum_pool_size(std::move(other.maximum_pool_size)),
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reconnect_policy(std::move(other.reconnect_policy)) {}
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connection_pool& operator=(const connection_pool&) = delete;
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connection_pool& operator=(connection_pool&&) = delete;
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pool_connection<Connection_config, Reconnect_policy, Connection> get_connection()
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{
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std::lock_guard<std::mutex> lock(connection_pool_mutex);
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if (!free_connections.empty())
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{
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auto connection = std::move(free_connections.top());
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free_connections.pop();
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return pool_connection<Connection_config, Reconnect_policy, Connection>(connection, this);
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}
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try
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{
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return pool_connection<Connection_config, Reconnect_policy, Connection>(std::move(std::make_unique<Connection>(config)), this);
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}
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catch (const sqlpp::exception& e)
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{
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std::cerr << "Failed to spawn a new connection." << std::endl;
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std::cerr << e.what() << std::endl;
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throw;
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}
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}
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};
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template<typename Connection_config,
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typename Reconnect_policy = reconnect_policy::auto_reconnect,
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typename Connection = typename std::enable_if<std::is_class<Connection_config::connection>::value,Connection_config::connection>::type>
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connection_pool<Connection_config, Reconnect_policy, Connection> make_connection_pool(
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const std::shared_ptr<Connection_config>& config,
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size_t max_pool_size)
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{
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return connection_pool<Connection_config, Reconnect_policy, Connection>(config, max_pool_size);
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}
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}
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#endif
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76
include/sqlpp11/pool_connection.h
Normal file
76
include/sqlpp11/pool_connection.h
Normal file
@@ -0,0 +1,76 @@
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/*
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* Copyright (c) 2013 - 2017, Roland Bock, Frank Park
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice, this
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* list of conditions and the following disclaimer in the documentation and/or
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* other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
|
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef SQLPP_POOL_CONNECTION_H
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#define SQLPP_POOL_CONNECTION_H
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#include <memory>
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namespace sqlpp
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{
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template <typename Connection_config, typename Reconnect_policy, typename Connection,
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typename Connection_pool = connection_pool<Connection_config, Reconnect_policy, Connection>>
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struct pool_connection
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{
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private:
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std::unique_ptr<Connection> _impl;
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Connection_pool* origin;
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public:
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pool_connection(std::unique_ptr<Connection>& connection, Connection_pool* origin)
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: _impl(std::move(connection)), origin(origin) {}
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~pool_connection()
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{
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origin->free_connection(_impl);
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}
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template<typename... Args>
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auto operator()(Args&&... args) -> decltype(_impl->args(std::forward<Args>(args)...))
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{
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return _impl->args(std::forward<Args>(args)...);
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}
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template <typename T>
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auto operator()(const T& t) -> decltype(_impl->run(t))
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{
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return _impl->run(t);
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}
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Connection* operator->()
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{
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return &_impl;
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}
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pool_connection(const pool_connection&) = delete;
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pool_connection(pool_connection&& other)
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: _impl(std::move(other._impl)), origin(other.origin) {}
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pool_connection& operator=(const pool_connection&) = delete;
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pool_connection& operator=(pool_connection&&) = delete;
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};
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}
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#endif
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