Coverage Report - org.mule.component.BindingInvocationHandler
 
Classes in this File Line Coverage Branch Coverage Complexity
BindingInvocationHandler
0%
0/50
0%
0/28
0
 
 1  
 /*
 2  
  * $Id: BindingInvocationHandler.java 19191 2010-08-25 21:05:23Z tcarlson $
 3  
  * --------------------------------------------------------------------------------------
 4  
  * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.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.component;
 12  
 
 13  
 import org.mule.DefaultMuleEvent;
 14  
 import org.mule.DefaultMuleMessage;
 15  
 import org.mule.RequestContext;
 16  
 import org.mule.api.MuleContext;
 17  
 import org.mule.api.MuleEvent;
 18  
 import org.mule.api.MuleMessage;
 19  
 import org.mule.api.component.InterfaceBinding;
 20  
 import org.mule.api.config.MuleProperties;
 21  
 import org.mule.config.i18n.CoreMessages;
 22  
 import org.mule.transport.NullPayload;
 23  
 import org.mule.util.StringMessageUtils;
 24  
 
 25  
 import java.lang.reflect.InvocationHandler;
 26  
 import java.lang.reflect.Method;
 27  
 import java.util.Map;
 28  
 
 29  
 import edu.emory.mathcs.backport.java.util.concurrent.ConcurrentHashMap;
 30  
 
 31  
 import org.apache.commons.logging.Log;
 32  
 import org.apache.commons.logging.LogFactory;
 33  
 
 34  
 public class BindingInvocationHandler implements InvocationHandler
 35  
 {
 36  
 
 37  
     public static final String DEFAULT_METHOD_NAME_TOKEN = "default";
 38  
 
 39  0
     protected static Log logger = LogFactory.getLog(BindingInvocationHandler.class);
 40  
 
 41  0
     protected Map<String, InterfaceBinding> routers = null;
 42  
 
 43  
     protected MuleContext muleContext;
 44  
 
 45  
     @SuppressWarnings("unchecked")
 46  
     public BindingInvocationHandler(InterfaceBinding router)
 47  0
     {
 48  0
         routers = new ConcurrentHashMap();
 49  0
         addRouterForInterface(router);
 50  0
     }
 51  
 
 52  
     public void addRouterForInterface(InterfaceBinding router)
 53  
     {
 54  0
         if (router.getMethod() == null)
 55  
         {
 56  0
             if (routers.size() == 0)
 57  
             {
 58  0
                 routers.put(DEFAULT_METHOD_NAME_TOKEN, router);
 59  
             }
 60  
             else
 61  
             {
 62  0
                 throw new IllegalArgumentException(CoreMessages.mustSetMethodNamesOnBinding().getMessage());
 63  
             }
 64  
         }
 65  
         else
 66  
         {
 67  0
             routers.put(router.getMethod(), router);
 68  
         }
 69  0
         muleContext = router.getEndpoint().getConnector().getMuleContext();
 70  0
     }
 71  
 
 72  
     public Object invoke(Object proxy, Method method, Object[] args) throws Throwable
 73  
     {
 74  0
         if (method.getName().equals("toString"))
 75  
         {
 76  0
             return toString();
 77  
         }
 78  
 
 79  0
         MuleMessage message = createMuleMessage(args);
 80  
 
 81  
         // Some transports such as Axis, RMI and EJB can use the method information
 82  0
         message.setInvocationProperty(MuleProperties.MULE_METHOD_PROPERTY, method.getName());
 83  
 
 84  0
         InterfaceBinding router = routers.get(method.getName());
 85  0
         if (router == null)
 86  
         {
 87  0
             router = routers.get(DEFAULT_METHOD_NAME_TOKEN);
 88  
         }
 89  
 
 90  0
         if (router == null)
 91  
         {
 92  0
             throw new IllegalArgumentException(CoreMessages.cannotFindBindingForMethod(method.getName()).toString());
 93  
         }
 94  
 
 95  0
         MuleEvent currentEvent = RequestContext.getEvent();
 96  0
         MuleEvent replyEvent = router.process(new DefaultMuleEvent(message,currentEvent));
 97  
 
 98  0
         if (replyEvent != null && replyEvent.getMessage()!=null)
 99  
         {
 100  0
             MuleMessage reply = replyEvent.getMessage();
 101  0
             if (reply.getExceptionPayload() != null)
 102  
             {
 103  0
                 throw findDeclaredMethodException(method, reply.getExceptionPayload().getException());
 104  
             }
 105  
             else
 106  
             {
 107  0
                 return determineReply(reply, method);
 108  
             }
 109  
         }
 110  
         else
 111  
         {
 112  0
             return null;
 113  
         }
 114  
     }
 115  
     
 116  
     private MuleMessage createMuleMessage(Object[] args)
 117  
     {
 118  0
         if (args == null)
 119  
         {
 120  0
             return new DefaultMuleMessage(NullPayload.getInstance(), muleContext);
 121  
         }
 122  0
         else if (args.length == 1)
 123  
         {
 124  0
             return new DefaultMuleMessage(args[0], muleContext);
 125  
         }
 126  
         else
 127  
         {
 128  0
             return new DefaultMuleMessage(args, muleContext);
 129  
         }
 130  
     }
 131  
 
 132  
     /**
 133  
      * Return the causing exception instead of the general "container" exception (typically 
 134  
      * UndeclaredThrowableException) if the cause is known and the type matches one of the
 135  
      * exceptions declared in the given method's "throws" clause.
 136  
      */
 137  
     private Throwable findDeclaredMethodException(Method method, Throwable throwable) throws Throwable 
 138  
     {       
 139  0
         Throwable cause = throwable.getCause();
 140  0
         if (cause != null)
 141  
         {
 142  
             // Try to find a matching exception type from the method's "throws" clause, and if so
 143  
             // return that exception.
 144  0
             Class[] exceptions = method.getExceptionTypes();         
 145  0
             for (int i = 0; i < exceptions.length; i++)
 146  
             {
 147  0
                 if (cause.getClass().equals(exceptions[i]))
 148  
                 {
 149  0
                     return cause; 
 150  
                 }                       
 151  
             }   
 152  
         }
 153  
         
 154  0
         return throwable;
 155  
     }
 156  
     
 157  
     private Object determineReply(MuleMessage reply, Method bindingMethod)
 158  
     {
 159  0
         if (MuleMessage.class.isAssignableFrom(bindingMethod.getReturnType()))
 160  
         {
 161  0
             return reply;
 162  
         }
 163  
         else
 164  
         {
 165  0
             return reply.getPayload();
 166  
         }
 167  
     }
 168  
     
 169  
     @Override
 170  
     public String toString()
 171  
     {
 172  0
         final StringBuffer sb = new StringBuffer();
 173  0
         sb.append("BindingInvocation");
 174  0
         sb.append("{routers='").append(StringMessageUtils.toString(routers));
 175  0
         sb.append('}');
 176  0
         return sb.toString();
 177  
     }
 178  
     
 179  
 }