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79 lines
2.9 KiB
79 lines
2.9 KiB
// Copyright ?2013, 2020, Oracle and/or its affiliates.
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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, version 2.0, as
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// published by the Free Software Foundation.
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//
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// This program is also distributed with certain software (including
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// but not limited to OpenSSL) that is licensed under separate terms,
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// as designated in a particular file or component or in included license
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// documentation. The authors of MySQL hereby grant you an
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// additional permission to link the program and your derivative works
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// with the separately licensed software that they have included with
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// MySQL.
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//
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// Without limiting anything contained in the foregoing, this file,
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// which is part of MySQL Connector/NET, is also subject to the
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// Universal FOSS Exception, version 1.0, a copy of which can be found at
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// http://oss.oracle.com/licenses/universal-foss-exception.
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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
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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// See the GNU General Public License, version 2.0, for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along 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 System;
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using System.Collections.Generic;
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using System.Text;
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namespace MySql.Data.MySqlClient.Replication
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{
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/// <summary>
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/// Class that implements Round Robing Load Balancing technique.
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/// </summary>
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public class ReplicationRoundRobinServerGroup : ReplicationServerGroup
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{
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private int nextServer;
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public ReplicationRoundRobinServerGroup(string name, int retryTime) : base(name, retryTime)
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{
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this.nextServer = -1;
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}
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/// <summary>
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/// Gets an available server based on Round Robin load balancing.
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/// </summary>
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/// <param name="isSource">Flag indicating if the server to return must be a source.</param>
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/// <returns>A <see cref="ReplicationServer"/> object representing the next available server.</returns>
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internal protected override ReplicationServer GetServer(bool isSource)
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{
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for (int i = 0; i < this.Servers.Count; i++)
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{
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this.nextServer++;
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if (this.nextServer == this.Servers.Count)
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{
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this.nextServer = 0;
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}
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ReplicationServer s = this.Servers[this.nextServer];
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if (!s.IsAvailable)
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{
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continue;
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}
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if (isSource && !s.IsSource)
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{
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continue;
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}
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return s;
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}
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return null;
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}
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}
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}
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