1   /**
2    * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved.
3    *
4    * This library is free software; you can redistribute it and/or modify it under
5    * the terms of the GNU Lesser General Public License as published by the Free
6    * Software Foundation; either version 2.1 of the License, or (at your option)
7    * any later version.
8    *
9    * This library is distributed in the hope that it will be useful, but WITHOUT
10   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
11   * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
12   * details.
13   */
14  
15  package com.liferay.portal.dao.shard;
16  
17  import com.liferay.portal.util.PortalInstances;
18  import com.liferay.portal.util.PropsValues;
19  
20  import java.util.Map;
21  
22  /**
23   * <a href="RoundRobinShardSelector.java.html"><b><i>View Source</i></b></a>
24   *
25   * @author Alexander Chow
26   */
27  public class RoundRobinShardSelector implements ShardSelector {
28  
29      public String getShardName(
30          String scope, String shardName, Map<String, String> params) {
31  
32          if (scope.equals(ShardUtil.COMPANY_SCOPE)) {
33              int instances = PortalInstances.getCompanyIds().length;
34              int shards = PropsValues.SHARD_AVAILABLE_NAMES.length;
35  
36              return PropsValues.SHARD_AVAILABLE_NAMES[instances % shards];
37          }
38          else {
39              return PropsValues.SHARD_DEFAULT_NAME;
40          }
41      }
42  
43  }