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#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;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;
//#if !NETCORE10
// 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); } //#endif
}
/// <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><c>true</c> if the replication group name is found; otherwise, <c>false</c></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(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
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