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