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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.transport.tcp;
8   
9   import org.mule.DefaultMuleMessage;
10  import org.mule.api.ExceptionPayload;
11  import org.mule.api.MuleMessage;
12  import org.mule.api.construct.FlowConstruct;
13  import org.mule.api.endpoint.InboundEndpoint;
14  import org.mule.api.lifecycle.CreateException;
15  import org.mule.api.transport.Connector;
16  import org.mule.message.DefaultExceptionPayload;
17  import org.mule.transport.AbstractMessageReceiver;
18  import org.mule.transport.NullPayload;
19  
20  import java.io.IOException;
21  import java.net.Socket;
22  import java.util.ArrayList;
23  import java.util.List;
24  
25  import javax.resource.spi.work.Work;
26  
27  /**
28   * Extends {@link TcpMessageReceiver} providing managing of protocol error conditions.
29   * {@link TcpMessageReceiver.TcpWorker#getNextMessage(Object)} is extended so, in case
30   * of an protocol error it will try to send the exception back to the client instead
31   * of ignoring it. If an exception is thrown managing the error it will ignored.
32   */
33  public class ExceptionReturnTcpMessageReceiver extends TcpMessageReceiver
34  {
35  
36      public ExceptionReturnTcpMessageReceiver(Connector connector, FlowConstruct flowConstruct,
37           InboundEndpoint endpoint)
38              throws CreateException
39      {
40          super(connector, flowConstruct, endpoint);
41      }
42  
43      @Override
44      protected Work createWork(Socket socket) throws IOException
45      {
46          return new TcpWorker(socket, this);
47      }
48  
49      protected class TcpWorker extends TcpMessageReceiver.TcpWorker
50      {
51  
52          public TcpWorker(Socket socket, AbstractMessageReceiver receiver) throws IOException
53          {
54              super(socket, receiver);
55          }
56  
57          @Override
58          protected Object getNextMessage(Object resource) throws Exception
59          {
60              try
61              {
62                  return super.getNextMessage(resource);
63              }
64              catch (Exception e)
65              {
66                  manageException(e);
67                  return null;
68              }
69          }
70  
71          private void manageException(Exception readingException) throws Exception
72          {
73              try
74              {
75                  logger.warn("Failed to read message: " + readingException);
76  
77                  MuleMessage msg = new DefaultMuleMessage(NullPayload.getInstance(), connector.getMuleContext());
78                  ExceptionPayload exceptionPayload = new DefaultExceptionPayload(readingException);
79                  msg.setExceptionPayload(exceptionPayload);
80                  List msgList = new ArrayList(1);
81                  msgList.add(msg);
82  
83                  handleResults(msgList);
84              }
85              catch (Exception writingException)
86              {
87                  logger.warn("Failed to write exception back to client: " + writingException);
88                  throw writingException;
89              }
90          }
91      }
92  }