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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    * 
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   * 
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.jetspeed.util.interceptors;
18  
19  import org.aopalliance.intercept.MethodInterceptor;
20  import org.aopalliance.intercept.MethodInvocation;
21  import org.apache.jetspeed.page.impl.DatabasePageManagerCache;
22  
23  /***
24   * Aspect that will attempt to rollback cache entries upon Page Manager failures
25   *
26   * @author <a href="mailto:david@bluesunrise.com">David Sean Taylor</a>
27   */
28  public class PageManagerInterceptor implements MethodInterceptor
29  {
30  
31      /*** Serialization version identifier */
32      private static final long serialVersionUID = -1316279974504594833L;
33  
34      /***
35       * Encloses <code>super.invoke()</code> in a try/catch block, where the
36       * catch block contains additional retry logic.
37       */
38      public Object invoke(MethodInvocation invocation) throws Throwable
39      {
40          try
41          {            
42              return invocation.proceed();
43          } 
44          catch (Exception exp)
45          {
46              DatabasePageManagerCache.rollbackTransactions();
47              throw exp;
48          }
49      }
50  
51  }