PreemptiveLoaderAction


1   /*
2    * Copyright 1999-2004 The Apache Software Foundation.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    * 
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package org.apache.cocoon.transformation.helpers;
17  
18  import java.util.Map  ;
19  
20  import org.apache.avalon.framework.parameters.Parameters;
21  import org.apache.avalon.framework.thread.ThreadSafe;
22  import org.apache.cocoon.acting.ServiceableAction;
23  import org.apache.cocoon.environment.Redirector;
24  import org.apache.cocoon.environment.SourceResolver;
25  
26  /**
27   * This action starts the preemptive loader and runs forever.
28   * 
29   *  @author <a HREF="mailto:cziegeler@apache.org">Carsten Ziegeler</a>
30   *  @version CVS $Id: PreemptiveLoaderAction.java 30932 2004-07-29 17:35:38Z vgritsenko $
31   *  @since   2.1
32   */
33  public class PreemptiveLoaderAction 
34      extends ServiceableAction
35      implements ThreadSafe {
36  
37      /**
38       * This action starts the preemptive loading
39       * It runs forever and is stopped by the {@link DefaultIncludeCacheManager}.
40       * @see org.apache.cocoon.acting.Action#act(Redirector, SourceResolver, Map, String, Parameters)
41       */
42      public Map   act(Redirector redirector,
43                      SourceResolver resolver,
44                      Map   objectModel,
45                      String   source,
46                      Parameters parameters)
47      throws Exception   {
48          PreemptiveLoader loader = PreemptiveLoader.getInstance();
49          if (!loader.alive) {
50              loader.process(this.manager, resolver, this.getLogger());
51              return EMPTY_MAP;
52          }
53          return null;
54      }
55  }
56
A to Z: JavaDoc & Examples Daily Java News & Articles Open Source Projects Open Source Codes Free Computer Books Remove Frame
Popular Tags