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1   /*
2    * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
3    * The software in this package is published under the terms of the CPAL v1.0
4    * license, a copy of which has been included with this distribution in the
5    * LICENSE.txt file.
6    */
7   package org.mule.api.interceptor;
8   
9   import org.mule.api.MuleEvent;
10  import org.mule.api.MuleException;
11  import org.mule.api.processor.InterceptingMessageProcessor;
12  
13  /**
14   * <code>Interceptor</code> is based on a similar concept of servlet filters and
15   * works much the same way. This method is more commonally known as the interceptor
16   * pattern and it allows for pre and processing of invocations on the object being
17   * intercepted.
18   */
19  public interface Interceptor extends InterceptingMessageProcessor
20  {
21  
22      /**
23       * Invoked when the component should be called. The implementation can call
24       * next.process(event) to call the component or the next filer in the chain.
25       * 
26       * @param event the event containing info about the current message and service
27       * @return A result message that may have been altered by this invocation
28       * @throws org.mule.api.MuleException if the invocation fails
29       */
30      MuleEvent process(MuleEvent event) throws MuleException;
31  
32  }