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