1   /**
2    * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3    *
4    * Permission is hereby granted, free of charge, to any person obtaining a copy
5    * of this software and associated documentation files (the "Software"), to deal
6    * in the Software without restriction, including without limitation the rights
7    * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8    * copies of the Software, and to permit persons to whom the Software is
9    * furnished to do so, subject to the following conditions:
10   *
11   * The above copyright notice and this permission notice shall be included in
12   * all copies or substantial portions of the Software.
13   *
14   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20   * SOFTWARE.
21   */
22  
23  package com.liferay.portal.dao.shard;
24  
25  import com.liferay.portal.util.PortalInstances;
26  import com.liferay.portal.util.PropsValues;
27  
28  import java.util.Map;
29  
30  /**
31   * <a href="RoundRobinShardSelector.java.html"><b><i>View Source</i></b></a>
32   *
33   * @author Alexander Chow
34   *
35   */
36  public class RoundRobinShardSelector implements ShardSelector {
37  
38      public String getShardName(
39          String scope, String shardName, Map<String, String> params) {
40  
41          if (scope.equals(ShardUtil.COMPANY_SCOPE)) {
42              int instances = PortalInstances.getCompanyIds().length;
43              int shards = PropsValues.SHARD_AVAILABLE_NAMES.length;
44  
45              return PropsValues.SHARD_AVAILABLE_NAMES[instances % shards];
46          }
47          else {
48              return PropsValues.SHARD_DEFAULT_NAME;
49          }
50      }
51  
52  }