Clover coverage report - Code Coverage for hivemind release 1.0-beta-1
Coverage timestamp: Sat Jul 3 2004 09:41:37 EDT
file stats: LOC: 194   Methods: 7
NCLOC: 137   Classes: 1
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 Source file Conditionals Statements Methods TOTAL
EventLinkerImpl.java 100% 92.9% 100% 95.5%
coverage coverage
 1   
 //  Copyright 2004 The Apache Software Foundation
 2   
 //
 3   
 // Licensed under the Apache License, Version 2.0 (the "License");
 4   
 // you may not use this file except in compliance with the License.
 5   
 // You may obtain a copy of the License at
 6   
 //
 7   
 //     http://www.apache.org/licenses/LICENSE-2.0
 8   
 //
 9   
 // Unless required by applicable law or agreed to in writing, software
 10   
 // distributed under the License is distributed on an "AS IS" BASIS,
 11   
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 12   
 // See the License for the specific language governing permissions and
 13   
 // limitations under the License.
 14   
 
 15   
 package org.apache.hivemind.service.impl;
 16   
 
 17   
 import java.beans.BeanInfo;
 18   
 import java.beans.EventSetDescriptor;
 19   
 import java.beans.IntrospectionException;
 20   
 import java.beans.Introspector;
 21   
 import java.lang.reflect.Method;
 22   
 import java.util.HashMap;
 23   
 import java.util.Map;
 24   
 
 25   
 import org.apache.commons.logging.Log;
 26   
 import org.apache.commons.logging.LogFactory;
 27   
 import org.apache.hivemind.ErrorHandler;
 28   
 import org.apache.hivemind.HiveMind;
 29   
 import org.apache.hivemind.Location;
 30   
 import org.apache.hivemind.impl.BaseLocatable;
 31   
 import org.apache.hivemind.service.EventLinker;
 32   
 
 33   
 /**
 34   
  * Implementation of {@link org.apache.hivemind.service.EventLinker}. Will output warnings
 35   
  * whenever a consumer can't be registered for at least one event set (which can happen
 36   
  * when the consumer does not implement the necessary interfaces).
 37   
  *
 38   
  * @author Howard Lewis Ship
 39   
  */
 40   
 public class EventLinkerImpl extends BaseLocatable implements EventLinker
 41   
 {
 42   
     private Log _log;
 43   
     private ErrorHandler _errorHandler;
 44   
 
 45   
     /**
 46   
      * Map of {@link java.beans.EventSetDescriptor}[], keyed on producer class.
 47   
      */
 48   
     private Map _producerEventSets;
 49   
 
 50  9
     public EventLinkerImpl(Log log, ErrorHandler errorHandler)
 51   
     {
 52  9
         _log = log;
 53  9
         _errorHandler = errorHandler;
 54   
     }
 55   
 
 56  10
     public void addEventListener(
 57   
         Object producer,
 58   
         String eventSetName,
 59   
         Object consumer,
 60   
         Location location)
 61   
     {
 62  10
         EventSetDescriptor[] sets = getEventSets(producer);
 63  10
         boolean nameMatch = HiveMind.isNonBlank(eventSetName);
 64  10
         Class consumerClass = consumer.getClass();
 65   
 
 66  10
         int count = 0;
 67  10
         for (int i = 0; i < sets.length; i++)
 68   
         {
 69  9
             EventSetDescriptor set = sets[i];
 70  9
             String name = set.getName();
 71   
 
 72  9
             if (nameMatch)
 73   
             {
 74  3
                 if (!eventSetName.equals(name))
 75  1
                     continue;
 76   
 
 77  2
                 if (isAssignable(set, consumerClass))
 78  1
                     addEventListener(producer, set, consumer, location);
 79   
                 else
 80   
                 {
 81  1
                     _errorHandler.error(
 82   
                         _log,
 83   
                         ServiceMessages.notCompatibleWithEvent(consumer, set, producer),
 84   
                         location,
 85   
                         null);
 86   
                 }
 87   
 
 88  2
                 return;
 89   
             }
 90   
 
 91   
             // Not matching on name, add anything that fits!
 92   
 
 93  6
             if (isAssignable(set, consumerClass))
 94   
             {
 95  5
                 addEventListener(producer, set, consumer, location);
 96  5
                 count++;
 97   
             }
 98   
         }
 99   
 
 100  8
         if (count == 0)
 101   
         {
 102  3
             if (nameMatch)
 103  1
                 _errorHandler.error(
 104   
                     _log,
 105   
                     ServiceMessages.noSuchEventSet(producer, eventSetName),
 106   
                     location,
 107   
                     null);
 108   
             else
 109  2
                 _errorHandler.error(
 110   
                     _log,
 111   
                     ServiceMessages.noEventMatches(consumer, producer),
 112   
                     location,
 113   
                     null);
 114   
         }
 115   
     }
 116   
 
 117  8
     private boolean isAssignable(EventSetDescriptor set, Class consumerClass)
 118   
     {
 119  8
         return set.getListenerType().isAssignableFrom(consumerClass);
 120   
     }
 121   
 
 122  6
     private void addEventListener(
 123   
         Object producer,
 124   
         EventSetDescriptor set,
 125   
         Object consumer,
 126   
         Location location)
 127   
     {
 128  6
         Method m = set.getAddListenerMethod();
 129   
 
 130  6
         try
 131   
         {
 132  6
             m.invoke(producer, new Object[] { consumer });
 133   
         }
 134   
         catch (Exception ex)
 135   
         {
 136  0
             _errorHandler.error(
 137   
                 _log,
 138   
                 ServiceMessages.unableToAddListener(producer, set, consumer, location, ex),
 139   
                 location,
 140   
                 ex);
 141   
 
 142   
         }
 143   
     }
 144   
 
 145  10
     private EventSetDescriptor[] getEventSets(Object producer)
 146   
     {
 147  10
         return getEventSets(producer.getClass());
 148   
     }
 149   
 
 150  10
     private synchronized EventSetDescriptor[] getEventSets(Class producerClass)
 151   
     {
 152  10
         EventSetDescriptor[] result = null;
 153   
 
 154  10
         if (_producerEventSets == null)
 155  9
             _producerEventSets = new HashMap();
 156   
         else
 157  1
             result = (EventSetDescriptor[]) _producerEventSets.get(producerClass);
 158   
 
 159  10
         if (result == null)
 160   
         {
 161  9
             result = findEventSets(producerClass);
 162   
 
 163  9
             _producerEventSets.put(producerClass, result);
 164   
         }
 165   
 
 166  10
         return result;
 167   
     }
 168   
 
 169  9
     private EventSetDescriptor[] findEventSets(Class producerClass)
 170   
     {
 171  9
         try
 172   
         {
 173  9
             BeanInfo beanInfo = Introspector.getBeanInfo(producerClass);
 174   
 
 175   
             // Will return an empty array (not null) when the class contains
 176   
             // no event sets.
 177   
 
 178  9
             return beanInfo.getEventSetDescriptors();
 179   
         }
 180   
         catch (IntrospectionException ex)
 181   
         {
 182  0
             _errorHandler.error(
 183   
                 _log,
 184   
                 ServiceMessages.unableToIntrospectClass(producerClass, ex),
 185   
                 null,
 186   
                 ex);
 187   
 
 188  0
             return new EventSetDescriptor[0];
 189   
         }
 190   
 
 191   
     }
 192   
 
 193   
 }
 194