Clover coverage report - Code Coverage for hivemind release 1.1-alpha-1
Coverage timestamp: Tue Jan 18 2005 07:55:08 EST
file stats: LOC: 180   Methods: 7
NCLOC: 124   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, 2005 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.hivemind.ErrorLog;
 26   
 import org.apache.hivemind.HiveMind;
 27   
 import org.apache.hivemind.Location;
 28   
 import org.apache.hivemind.impl.BaseLocatable;
 29   
 import org.apache.hivemind.service.EventLinker;
 30   
 
 31   
 /**
 32   
  * Implementation of {@link org.apache.hivemind.service.EventLinker}. Will output warnings whenever
 33   
  * a consumer can't be registered for at least one event set (which can happen when the consumer
 34   
  * does not implement the necessary interfaces).
 35   
  * 
 36   
  * @author Howard Lewis Ship
 37   
  */
 38   
 public class EventLinkerImpl extends BaseLocatable implements EventLinker
 39   
 {
 40   
     private ErrorLog _errorLog;
 41   
 
 42   
     /**
 43   
      * Map of {@link java.beans.EventSetDescriptor}[], keyed on producer class.
 44   
      */
 45   
     private Map _producerEventSets;
 46   
 
 47  9
     public EventLinkerImpl(ErrorLog errorLog)
 48   
     {
 49  9
         _errorLog = errorLog;
 50   
     }
 51   
 
 52  10
     public void addEventListener(Object producer, String eventSetName, Object consumer,
 53   
             Location location)
 54   
     {
 55  10
         EventSetDescriptor[] sets = getEventSets(producer);
 56  10
         boolean nameMatch = HiveMind.isNonBlank(eventSetName);
 57  10
         Class consumerClass = consumer.getClass();
 58   
 
 59  10
         int count = 0;
 60  10
         for (int i = 0; i < sets.length; i++)
 61   
         {
 62  9
             EventSetDescriptor set = sets[i];
 63  9
             String name = set.getName();
 64   
 
 65  9
             if (nameMatch)
 66   
             {
 67  3
                 if (!eventSetName.equals(name))
 68  1
                     continue;
 69   
 
 70  2
                 if (isAssignable(set, consumerClass))
 71  1
                     addEventListener(producer, set, consumer, location);
 72   
                 else
 73   
                 {
 74  1
                     _errorLog.error(
 75   
                             ServiceMessages.notCompatibleWithEvent(consumer, set, producer),
 76   
                             location,
 77   
                             null);
 78   
                 }
 79   
 
 80  2
                 return;
 81   
             }
 82   
 
 83   
             // Not matching on name, add anything that fits!
 84   
 
 85  6
             if (isAssignable(set, consumerClass))
 86   
             {
 87  5
                 addEventListener(producer, set, consumer, location);
 88  5
                 count++;
 89   
             }
 90   
         }
 91   
 
 92  8
         if (count == 0)
 93   
         {
 94  3
             if (nameMatch)
 95  1
                 _errorLog.error(
 96   
                         ServiceMessages.noSuchEventSet(producer, eventSetName),
 97   
                         location,
 98   
                         null);
 99   
             else
 100  2
                 _errorLog.error(ServiceMessages.noEventMatches(consumer, producer), location, null);
 101   
         }
 102   
     }
 103   
 
 104  8
     private boolean isAssignable(EventSetDescriptor set, Class consumerClass)
 105   
     {
 106  8
         return set.getListenerType().isAssignableFrom(consumerClass);
 107   
     }
 108   
 
 109  6
     private void addEventListener(Object producer, EventSetDescriptor set, Object consumer,
 110   
             Location location)
 111   
     {
 112  6
         Method m = set.getAddListenerMethod();
 113   
 
 114  6
         try
 115   
         {
 116  6
             m.invoke(producer, new Object[]
 117   
             { consumer });
 118   
         }
 119   
         catch (Exception ex)
 120   
         {
 121  0
             _errorLog.error(ServiceMessages.unableToAddListener(
 122   
                     producer,
 123   
                     set,
 124   
                     consumer,
 125   
                     location,
 126   
                     ex), location, ex);
 127   
 
 128   
         }
 129   
     }
 130   
 
 131  10
     private EventSetDescriptor[] getEventSets(Object producer)
 132   
     {
 133  10
         return getEventSets(producer.getClass());
 134   
     }
 135   
 
 136  10
     private synchronized EventSetDescriptor[] getEventSets(Class producerClass)
 137   
     {
 138  10
         EventSetDescriptor[] result = null;
 139   
 
 140  10
         if (_producerEventSets == null)
 141  9
             _producerEventSets = new HashMap();
 142   
         else
 143  1
             result = (EventSetDescriptor[]) _producerEventSets.get(producerClass);
 144   
 
 145  10
         if (result == null)
 146   
         {
 147  9
             result = findEventSets(producerClass);
 148   
 
 149  9
             _producerEventSets.put(producerClass, result);
 150   
         }
 151   
 
 152  10
         return result;
 153   
     }
 154   
 
 155  9
     private EventSetDescriptor[] findEventSets(Class producerClass)
 156   
     {
 157  9
         synchronized (HiveMind.INTROSPECTOR_MUTEX)
 158   
         {
 159  9
             try
 160   
             {
 161  9
                 BeanInfo beanInfo = Introspector.getBeanInfo(producerClass);
 162   
 
 163   
                 // Will return an empty array (not null) when the class contains
 164   
                 // no event sets.
 165   
 
 166  9
                 return beanInfo.getEventSetDescriptors();
 167   
             }
 168   
             catch (IntrospectionException ex)
 169   
             {
 170  0
                 _errorLog.error(
 171   
                         ServiceMessages.unableToIntrospectClass(producerClass, ex),
 172   
                         null,
 173   
                         ex);
 174   
 
 175  0
                 return new EventSetDescriptor[0];
 176   
             }
 177   
         }
 178   
     }
 179   
 
 180   
 }