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197 lines
7.1 KiB
197 lines
7.1 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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using Externals.MySql.Data.MySqlClient;
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namespace Externals.MySql.Data.MySqlClient.Replication
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{
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/// <summary>
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/// Manager for Replication and Load Balancing features
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/// </summary>
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internal static class ReplicationManager
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{
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private static List<ReplicationServerGroup> groups = new List<ReplicationServerGroup>();
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private static Object thisLock = new Object();
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//private static Dictionary<string, ReplicationServerSelector> selectors = new Dictionary<string, ReplicationServerSelector>();
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static ReplicationManager()
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{
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Groups = groups;
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// load up our selectors
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if (MySqlConfiguration.Settings == null) return;
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foreach (var group in MySqlConfiguration.Settings.Replication.ServerGroups)
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{
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ReplicationServerGroup g = AddGroup(group.Name, group.GroupType, group.RetryTime);
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foreach (var server in group.Servers)
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g.AddServer(server.Name, server.IsMaster, server.ConnectionString);
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}
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}
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/// <summary>
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/// Returns Replication Server Group List
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/// </summary>
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internal static IList<ReplicationServerGroup> Groups { get; private set; }
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/// <summary>
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/// Adds a Default Server Group to the list
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/// </summary>
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/// <param name="name">Group name</param>
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/// <param name="retryTime">Time between reconnections for failed servers</param>
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/// <returns>Replication Server Group added</returns>
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internal static ReplicationServerGroup AddGroup(string name, int retryTime)
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{
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return AddGroup( name, null, retryTime);
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}
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/// <summary>
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/// Adds a Server Group to the list
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/// </summary>
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/// <param name="name">Group name</param>
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/// <param name="groupType">ServerGroup type reference</param>
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/// <param name="retryTime">Time between reconnections for failed servers</param>
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/// <returns>Server Group added</returns>
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internal static ReplicationServerGroup AddGroup(string name, string groupType, int retryTime)
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{
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if (string.IsNullOrEmpty(groupType))
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groupType = "Externals.MySql.Data.MySqlClient.Replication.ReplicationRoundRobinServerGroup";
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Type t = Type.GetType(groupType);
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ReplicationServerGroup g = (ReplicationServerGroup)Activator.CreateInstance(t, name, retryTime) as ReplicationServerGroup;
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groups.Add(g);
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return g;
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}
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/// <summary>
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/// Gets the next server from a replication group
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/// </summary>
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/// <param name="groupName">Group name</param>
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/// <param name="isMaster">True if the server to return must be a master</param>
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/// <returns>Replication Server defined by the Load Balancing plugin</returns>
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internal static ReplicationServer GetServer(string groupName, bool isMaster)
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{
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ReplicationServerGroup group = GetGroup(groupName);
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return group.GetServer(isMaster);
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}
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/// <summary>
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/// Gets a Server Group by name
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/// </summary>
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/// <param name="groupName">Group name</param>
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/// <returns>Server Group if found, otherwise throws an MySqlException</returns>
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internal static ReplicationServerGroup GetGroup(string groupName)
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{
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ReplicationServerGroup group = null;
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foreach (ReplicationServerGroup g in groups)
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{
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if (String.Compare(g.Name, groupName, StringComparison.OrdinalIgnoreCase) != 0) continue;
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group = g;
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break;
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}
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if (group == null)
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throw new MySqlException(String.Format(Resources.ReplicationGroupNotFound, groupName));
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return group;
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}
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/// <summary>
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/// Validates if the replication group name exists
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/// </summary>
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/// <param name="groupName">Group name to validate</param>
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/// <returns>True if replication group name is found, otherwise false</returns>
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internal static bool IsReplicationGroup(string groupName)
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{
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foreach (ReplicationServerGroup g in groups)
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if (String.Compare(g.Name, groupName, StringComparison.OrdinalIgnoreCase) == 0) return true;
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return false;
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}
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/// <summary>
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/// Assigns a new server driver to the connection object
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/// </summary>
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/// <param name="groupName">Group name</param>
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/// <param name="master">True if the server connection to assign must be a master</param>
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/// <param name="connection">MySqlConnection object where the new driver will be assigned</param>
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internal static void GetNewConnection(string groupName, bool master, MySqlConnection connection)
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{
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do
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{
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lock (thisLock)
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{
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if (!IsReplicationGroup(groupName)) return;
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ReplicationServerGroup group = GetGroup(groupName);
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ReplicationServer server = group.GetServer(master, connection.Settings);
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if (server == null)
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throw new MySqlException(Properties.Resources.Replication_NoAvailableServer);
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try
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{
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bool isNewServer = false;
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if (connection.driver == null || !connection.driver.IsOpen)
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{
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isNewServer = true;
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}
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else
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{
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MySqlConnectionStringBuilder msb = new MySqlConnectionStringBuilder(server.ConnectionString);
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if (!msb.Equals(connection.driver.Settings))
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{
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isNewServer = true;
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}
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}
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if (isNewServer)
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{
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Driver driver = Driver.Create(new MySqlConnectionStringBuilder(server.ConnectionString));
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connection.driver = driver;
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}
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return;
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}
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catch (MySqlException ex)
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{
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connection.driver = null;
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server.IsAvailable = false;
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MySqlTrace.LogError(ex.Number, ex.ToString());
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if (ex.Number == 1042)
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{
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// retry to open a failed connection and update its status
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group.HandleFailover(server, ex);
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}
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else
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throw;
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}
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}
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} while (true);
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}
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}
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}
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#endif
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