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1   /*
2    * Copyright 2007-2008 the original author or authors.
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  
17  package org.gwe.persistence.model.order;
18  
19  import java.util.ArrayList;
20  import java.util.List;
21  import java.util.concurrent.Callable;
22  import java.util.concurrent.ExecutionException;
23  import java.util.concurrent.ExecutorService;
24  import java.util.concurrent.Future;
25  
26  import org.gwe.persistence.model.live.JobLive;
27  import org.gwe.utils.concurrent.ThreadPoolUtils;
28  
29  /**
30   * @author Marco Ruiz
31   * @since Aug 19, 2008
32   */
33  public abstract class JobSideWorker extends ArrayList<Callable<Void>> {
34  	
35      private static ExecutorService threadPool = ThreadPoolUtils.createThreadPool("Job Side Workers");
36  
37      public final void execute(JobLive ctx) throws Throwable {
38  		beforeExecuteProcessors(ctx);
39  		if (!this.isEmpty()) {
40  			List<Future<Void>> results = threadPool.invokeAll(this);
41  			for (Future<Void> result : results) {
42  				try {
43  					result.get();
44  				} catch(ExecutionException e) {
45  					throw e.getCause();
46  				}
47              }
48  		}
49  	}
50  	
51  	protected abstract void beforeExecuteProcessors(JobLive ctx) throws Exception;
52  
53  }