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173 lines
5.9 KiB
173 lines
5.9 KiB
#if MYSQL_6_9
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// Copyright © 2014, Oracle and/or its affiliates. All rights reserved.
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//
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// MySQL Connector/NET is licensed under the terms of the GPLv2
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// <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most
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// MySQL Connectors. There are special exceptions to the terms and
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// conditions of the GPLv2 as it is applied to this software, see the
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// FLOSS License Exception
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// <http://www.mysql.com/about/legal/licensing/foss-exception.html>.
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published
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// by the Free Software Foundation; version 2 of the License.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this program; if not, write to the Free Software Foundation, Inc.,
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// 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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using Externals.MySql.Data.MySqlClient.Properties;
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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Text;
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namespace Externals.MySql.Data.MySqlClient.Replication
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{
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/// <summary>
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/// Base class used to implement load balancing features
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/// </summary>
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internal abstract class ReplicationServerGroup
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{
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protected List<ReplicationServer> servers = new List<ReplicationServer>();
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/// <param name="name">Group name</param>
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/// <param name="retryTime"></param>
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public ReplicationServerGroup(string name, int retryTime)
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{
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Servers = servers;
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Name = name;
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RetryTime = retryTime;
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}
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/// <summary>
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/// Group name
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/// </summary>
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public string Name { get; protected set; }
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/// <summary>
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/// Retry time between connections to failed servers
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/// </summary>
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public int RetryTime { get; protected set; }
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/// <summary>
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/// Servers list in the group
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/// </summary>
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protected IList<ReplicationServer> Servers { get; private set; }
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/// <summary>
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/// Adds a server into the group
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/// </summary>
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/// <param name="name">Server name</param>
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/// <param name="isMaster">True if the server to add is master, False for slave server</param>
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/// <param name="connectionString">Connection string used by this server</param>
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/// <returns></returns>
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internal protected ReplicationServer AddServer(string name, bool isMaster, string connectionString)
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{
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ReplicationServer server = new ReplicationServer(name, isMaster, connectionString);
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servers.Add(server);
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return server;
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}
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/// <summary>
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/// Removes a server from group
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/// </summary>
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/// <param name="name">Server name</param>
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internal protected void RemoveServer(string name)
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{
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ReplicationServer serverToRemove = GetServer(name);
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if (serverToRemove == null)
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throw new MySqlException(String.Format(Resources.ReplicationServerNotFound, name));
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servers.Remove(serverToRemove);
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}
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/// <summary>
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/// Gets a server by name
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/// </summary>
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/// <param name="name">Server name</param>
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/// <returns>Replication server</returns>
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internal protected ReplicationServer GetServer(string name)
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{
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foreach (var server in servers)
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if (String.Compare(name, server.Name, StringComparison.OrdinalIgnoreCase) == 0) return server;
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return null;
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}
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/// <summary>
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/// Must be implemented. Defines the next server for a custom load balancing implementation.
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/// </summary>
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/// <param name="isMaster">Defines if the server to return is a master or any</param>
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/// <returns>Next server based on the load balancing implementation.
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/// Null if no available server is found.
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/// </returns>
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internal protected abstract ReplicationServer GetServer(bool isMaster);
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internal protected virtual ReplicationServer GetServer(bool isMaster, MySqlConnectionStringBuilder settings)
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{
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return GetServer(isMaster);
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}
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/// <summary>
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/// Handles a failed connection to a server.
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/// This method can be overrided to implement a custom failover handling
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/// </summary>
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/// <param name="server">The failed server</param>
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internal protected virtual void HandleFailover(ReplicationServer server)
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{
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BackgroundWorker worker = new BackgroundWorker();
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worker.DoWork += delegate(object sender, DoWorkEventArgs e)
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{
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bool isRunning = false;
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ReplicationServer server1 = e.Argument as ReplicationServer;
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System.Timers.Timer timer = new System.Timers.Timer(RetryTime * 1000.0);
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System.Timers.ElapsedEventHandler elapsedEvent = delegate(object sender1, System.Timers.ElapsedEventArgs e1)
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{
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if (isRunning) return;
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try
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{
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isRunning = true;
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using (MySqlConnection connectionFailed = new MySqlConnection(server.ConnectionString))
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{
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connectionFailed.Open();
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server1.IsAvailable = true;
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timer.Stop();
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}
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}
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catch
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{
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MySqlTrace.LogWarning(0,
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string.Format(Properties.Resources.Replication_ConnectionAttemptFailed, server1.Name));
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}
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finally
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{
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isRunning = false;
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}
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};
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timer.Elapsed += elapsedEvent;
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timer.Start();
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elapsedEvent(sender, null);
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};
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worker.RunWorkerAsync(server);
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}
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/// <summary>
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/// Handles a failed connection to a server.
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/// </summary>
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/// <param name="server">The failed server</param>
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/// <param name="exception">Exception that caused the failover</param>
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internal protected virtual void HandleFailover(ReplicationServer server, Exception exception)
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{
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HandleFailover(server);
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}
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}
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}
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#endif
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