ResumeActivity


1   /**
2    * Sequoia: Database clustering technology.
3    * Copyright (C) 2006 Continuent, Inc.
4    * Contact: sequoia@continuent.org
5    * 
6    * Licensed under the Apache License, Version 2.0 (the "License");
7    * you may not use this file except in compliance with the License.
8    * You may obtain a copy of the License at
9    * 
10   * http://www.apache.org/licenses/LICENSE-2.0
11   * 
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License. 
17   *
18   * Initial developer(s): Emmanuel Cecchet.
19   * Contributor(s): Damian Arregui.
20   */
21  
22  package org.continuent.sequoia.controller.virtualdatabase.protocol;
23  
24  import java.io.Serializable  ;
25  
26  import org.continuent.hedera.common.Member;
27  import org.continuent.sequoia.controller.scheduler.AbstractScheduler;
28  import org.continuent.sequoia.controller.virtualdatabase.DistributedVirtualDatabase;
29  
30  /**
31   * This class defines a ResumeActivity message. It undoes the affects of
32   * SuspendActivity. When executed it does the following things:
33   * <ol>
34   * <li>Resume writes, transactions and persistent connections.
35   * </ol>
36   * <p>
37   * 
38   * @author <a HREF="mailto:ralph.hannus@continuent.com">Ralph Hannus</a>
39   * @version 1.0
40   */
41  public class ResumeActivity extends DistributedVirtualDatabaseMessage
42  {
43    private static final long serialVersionUID = 7285174496382359441L;
44  
45    /**
46     * Creates a new <code>DisableBackendsAndSetCheckpoint</code> object
47     */
48    public ResumeActivity()
49    {
50    }
51  
52    /**
53     * @see org.continuent.sequoia.controller.virtualdatabase.protocol.DistributedVirtualDatabaseMessage#handleMessageSingleThreaded(org.continuent.sequoia.controller.virtualdatabase.DistributedVirtualDatabase,
54     *      org.continuent.hedera.common.Member)
55     */
56    public Object   handleMessageSingleThreaded(DistributedVirtualDatabase dvdb,
57        Member sender)
58    {
59      return null;
60    }
61  
62    /**
63     * @see org.continuent.sequoia.controller.virtualdatabase.protocol.DistributedVirtualDatabaseMessage#handleMessageMultiThreaded(org.continuent.sequoia.controller.virtualdatabase.DistributedVirtualDatabase,
64     *      org.continuent.hedera.common.Member, java.lang.Object)
65     */
66    public Serializable   handleMessageMultiThreaded(
67        DistributedVirtualDatabase dvdb, Member sender,
68        Object   handleMessageSingleThreadedResult)
69    {
70  
71      AbstractScheduler scheduler = dvdb.getRequestManager().getScheduler();
72      scheduler.resumeWritesTransactionsAndPersistentConnections();
73      return null;
74    }
75  }
76
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