ChainedExceptionListener


1   /*
2    * Copyright 2002-2006 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.springframework.jms.connection;
18  
19  import java.util.ArrayList  ;
20  import java.util.Iterator  ;
21  import java.util.List  ;
22  
23  import javax.jms.ExceptionListener  ;
24  import javax.jms.JMSException  ;
25  
26  import org.springframework.util.Assert;
27  
28  /**
29   * Implementation of the JMS ExceptionListener interface that supports chaining,
30   * allowing the addition of multiple ExceptionListener instances in order.
31   *
32   * @author Juergen Hoeller
33   * @since 2.0
34   */
35  public class ChainedExceptionListener implements ExceptionListener   {
36  
37      /** List of ExceptionListeners */
38      private final List   delegates = new ArrayList  (2);
39  
40  
41      /**
42       * Add an ExceptionListener to the chained delegate list.
43       */
44      public final void addDelegate(ExceptionListener   listener) {
45          Assert.notNull(listener, "ExceptionListener must not be null");
46          this.delegates.add(listener);
47      }
48  
49      /**
50       * Return all registered ExceptionListener delegates (as array).
51       */
52      public final ExceptionListener  [] getDelegates() {
53          return (ExceptionListener  []) this.delegates.toArray(new ExceptionListener  [this.delegates.size()]);
54      }
55  
56  
57      public void onException(JMSException   ex) {
58          for (Iterator   it = this.delegates.iterator(); it.hasNext();) {
59              ExceptionListener   listener = (ExceptionListener  ) it.next();
60              listener.onException(ex);
61          }
62      }
63  
64  }
65
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