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1   /*
2    * $Id: PipelineComponent.java 7976 2007-08-21 14:26:13Z 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.impl.model.pipeline;
12  
13  import org.mule.config.i18n.CoreMessages;
14  import org.mule.impl.MuleDescriptor;
15  import org.mule.impl.MuleMessage;
16  import org.mule.impl.RequestContext;
17  import org.mule.impl.model.direct.DirectComponent;
18  import org.mule.umo.UMOEvent;
19  import org.mule.umo.UMOException;
20  import org.mule.umo.UMOMessage;
21  import org.mule.umo.lifecycle.Callable;
22  import org.mule.umo.lifecycle.Disposable;
23  import org.mule.umo.lifecycle.Initialisable;
24  import org.mule.umo.lifecycle.InitialisationException;
25  import org.mule.umo.model.UMOModel;
26  import org.mule.umo.provider.DispatchException;
27  
28  public class PipelineComponent extends DirectComponent
29  {
30      /**
31       * Serial version
32       */
33      private static final long serialVersionUID = -2788210157354765190L;
34  
35      private Callable callable;
36  
37      public PipelineComponent(MuleDescriptor descriptor, UMOModel model)
38      {
39          super(descriptor, model);
40      }
41  
42      protected void doInitialise() throws InitialisationException
43      {
44  
45          super.doInitialise();
46          Object component = null;
47          try
48          {
49              component = lookupComponent();
50          }
51          catch (UMOException e)
52          {
53              throw new InitialisationException(e, this);
54          }
55          if (component instanceof Callable)
56          {
57              callable = (Callable) component;
58          }
59          else
60          {
61              throw new InitialisationException(
62                  CoreMessages.objectNotOfCorrectType(component.getClass(), Callable.class), this);
63          }
64  
65          if (component instanceof Initialisable)
66          {
67              ((Initialisable) component).initialise();
68          }
69  
70      }
71  
72      protected UMOMessage doSend(UMOEvent event) throws UMOException
73      {
74          try
75          {
76              Object result = callable.onCall(RequestContext.getEventContext());
77              UMOMessage returnMessage = null;
78              if (result instanceof UMOMessage)
79              {
80                  returnMessage = (UMOMessage) result;
81              }
82              else
83              {
84                  returnMessage = new MuleMessage(result, event.getMessage());
85              }
86              if (!event.isStopFurtherProcessing())
87              {
88                  // // TODO what about this code?
89                  // Map context = RequestContext.clearProperties();
90                  // if (context != null) {
91                  // returnMessage.addProperties(context);
92                  // }
93                  if (descriptor.getOutboundRouter().hasEndpoints())
94                  {
95                      UMOMessage outboundReturnMessage = descriptor.getOutboundRouter().route(returnMessage,
96                          event.getSession(), event.isSynchronous());
97                      if (outboundReturnMessage != null)
98                      {
99                          returnMessage = outboundReturnMessage;
100                     }
101                 }
102                 else
103                 {
104                     logger.debug("Outbound router on component '" + descriptor.getName()
105                                  + "' doesn't have any endpoints configured.");
106                 }
107             }
108 
109             return returnMessage;
110         }
111         catch (Exception e)
112         {
113             throw new DispatchException(event.getMessage(), event.getEndpoint(), e);
114         }
115     }
116 
117     protected void doDispatch(UMOEvent event) throws UMOException
118     {
119         sendEvent(event);
120     }
121 
122     protected void doDispose()
123     {
124         if (callable instanceof Disposable)
125         {
126             ((Disposable) callable).dispose();
127         }
128     }
129 }