|
|
#if MYSQL_6_10
// Copyright ?2014, 2018, Oracle and/or its affiliates. All rights reserved.
//
// MySQL Connector/NET is licensed under the terms of the GPLv2
// <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, 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
// <http://www.mysql.com/about/legal/licensing/foss-exception.html>.
//
// 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 System;using System.Collections.Generic;using System.ComponentModel;using System.Text;
namespace Externals.MySql.Data.MySqlClient.Replication{ /// <summary>
/// Base class used to implement load balancing features.
/// </summary>
internal abstract class ReplicationServerGroup { /// <summary>
/// List of servers available for replication.
/// </summary>
protected List<ReplicationServer> servers = new List<ReplicationServer>();
/// <param name="name">The group name.</param>
/// <param name="retryTime">The number of seconds to perform a retry.</param>
public ReplicationServerGroup(string name, int retryTime) { Servers = servers; Name = name; RetryTime = retryTime; }
/// <summary>
/// Gets the group name.
/// </summary>
public string Name { get; protected set; } /// <summary>
/// Gets the retry time between connections to failed servers.
/// </summary>
public int RetryTime { get; protected set; } /// <summary>
/// Gets the server list in the group.
/// </summary>
protected IList<ReplicationServer> Servers { get; private set; }
/// <summary>
/// Adds a server into the group.
/// </summary>
/// <param name="name">The server name.</param>
/// <param name="isMaster">A flag indicating if the server to add is master or slave.</param>
/// <param name="connectionString">The connection string used by this server.</param>
/// <returns>A <see cref="ReplicationServer"/> object representing the recently added object.</returns>
internal protected ReplicationServer AddServer(string name, bool isMaster, string connectionString) { ReplicationServer server = new ReplicationServer(name, isMaster, connectionString); servers.Add(server); return server; }
/// <summary>
/// Removes a server from the group.
/// </summary>
/// <param name="name">The server name.</param>
internal protected void RemoveServer(string name) { ReplicationServer serverToRemove = GetServer(name); if (serverToRemove == null) throw new MySqlException(String.Format(Resources.ReplicationServerNotFound, name)); servers.Remove(serverToRemove); }
/// <summary>
/// Gets a server by name.
/// </summary>
/// <param name="name">The server name.</param>
/// <returns>The replication server.</returns>
internal protected ReplicationServer GetServer(string name) { foreach (var server in servers) if (String.Compare(name, server.Name, StringComparison.OrdinalIgnoreCase) == 0) return server; return null; }
/// <summary>
/// Must be implemented. Defines the next server for a custom load balancing implementation.
/// </summary>
/// <param name="isMaster">Defines if the server to return is a master or any.</param>
/// <returns>The next server based on the load balancing implementation.
/// Null if no available server is found.
/// </returns>
internal protected abstract ReplicationServer GetServer(bool isMaster);
/// <summary>
/// Defines the next server for a custom load balancing implementation.
/// </summary>
/// <param name="isMaster">Defines if the server to return is a master or any.</param>
/// <param name="settings">Currently not being used.</param>
/// <returns>The next server based on the load balancing implementation.
/// Null if no available server is found.
/// </returns>
internal protected virtual ReplicationServer GetServer(bool isMaster, MySqlConnectionStringBuilder settings) { return GetServer(isMaster); }
/// <summary>
/// Handles a failed connection to a server.
/// </summary>
/// <param name="server">The failed server.</param>
/// <remarks>This method can be overrided to implement a custom failover handling.</remarks>
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;#if !NETSTANDARD1_3
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(Resources.Replication_ConnectionAttemptFailed, server1.Name)); } finally { isRunning = false; } }; timer.Elapsed += elapsedEvent; timer.Start(); elapsedEvent(sender, null);#else
Windows.UI.Xaml.DispatcherTimer timer = new Windows.UI.Xaml.DispatcherTimer(); TimeSpan ts = new TimeSpan(RetryTime * 1000); System.EventHandler<object> elapsedEvent = (TickSender, TickEventArgs) => { 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.Tick += elapsedEvent; elapsedEvent(sender, null); timer.Start();#endif
};
worker.RunWorkerAsync(server); }
/// <summary>
/// Handles a failed connection to a server.
/// </summary>
/// <param name="server">The failed server.</param>
/// <param name="exception">The exception that caused the failover.</param>
internal protected virtual void HandleFailover(ReplicationServer server, Exception exception) { HandleFailover(server); } }}
#endif
|
