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1   /*
2    * $Id: BatchConstraint.java 7963 2007-08-21 08:53:15Z dirk.olmes $
3    * --------------------------------------------------------------------------------------
4    * Copyright (c) MuleSource, Inc.  All rights reserved.  http://www.mulesource.com
5    *
6    * The software in this package is published under the terms of the CPAL v1.0
7    * license, a copy of which has been included with this distribution in the
8    * LICENSE.txt file.
9    */
10  
11  package org.mule.transaction.constraints;
12  
13  import org.mule.umo.UMOEvent;
14  
15  /**
16   * <code>BatchConstraint</code> is a filter that counts on every execution and
17   * returns true when the batch size value equals the execution count.
18   */
19  // @ThreadSafe
20  public class BatchConstraint extends ConstraintFilter
21  {
22      // @GuardedBy(this)
23      private int batchSize = 1;
24      // @GuardedBy(this)
25      private int batchCount = 0;
26  
27      public boolean accept(UMOEvent event)
28      {
29          synchronized (this)
30          {
31              batchCount++;
32              return batchCount == batchSize;
33          }
34      }
35  
36      public int getBatchSize()
37      {
38          synchronized (this)
39          {
40              return batchSize;
41          }
42      }
43  
44      public synchronized void setBatchSize(int batchSize)
45      {
46          synchronized (this)
47          {
48              this.batchSize = batchSize;
49          }
50      }
51  
52      public Object clone() throws CloneNotSupportedException
53      {
54          synchronized (this)
55          {
56              BatchConstraint clone = (BatchConstraint) super.clone();
57              clone.setBatchSize(batchSize);
58              for (int i = 0; i < batchCount; i++)
59              {
60                  clone.accept(null);
61              }
62              return clone;
63          }
64      }
65  
66  }