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: 184   Methods: 9
NCLOC: 101   Classes: 2
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 Source file Conditionals Statements Methods TOTAL
ThreadedServiceModel.java 90% 96.9% 100% 96.1%
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.impl.servicemodel;
 16   
 
 17   
 import org.apache.hivemind.ApplicationRuntimeException;
 18   
 import org.apache.hivemind.Discardable;
 19   
 import org.apache.hivemind.HiveMind;
 20   
 import org.apache.hivemind.events.RegistryShutdownListener;
 21   
 import org.apache.hivemind.impl.ConstructableServicePoint;
 22   
 import org.apache.hivemind.impl.ProxyUtils;
 23   
 import org.apache.hivemind.internal.Module;
 24   
 import org.apache.hivemind.service.ThreadCleanupListener;
 25   
 import org.apache.hivemind.service.ThreadEventNotifier;
 26   
 
 27   
 /**
 28   
  * Like
 29   
  * {@link org.apache.hivemind.impl.SingletonServiceModel}, 
 30   
  * this method returns a proxy (implementing the service interface); unlike
 31   
  * SingletonServiceModel, it <em>always</em> returns the proxy.
 32   
  * Invoking a service method on the proxy constructs a service implementation
 33   
  * and binds it to the current thread. 
 34   
  *
 35   
  * @author Howard Lewis Ship
 36   
  */
 37   
 public final class ThreadedServiceModel extends AbstractServiceModelImpl
 38   
 {
 39   
     /**
 40   
      * Name of a method in the deferred proxy that is used to obtain
 41   
      * the constructed service.
 42   
      */
 43   
     protected static final String SERVICE_ACCESSOR_METHOD_NAME = "_service";
 44   
 
 45   
     private Object _serviceProxy;
 46   
     private ThreadEventNotifier _notifier;
 47   
 
 48  6
     public ThreadedServiceModel(ConstructableServicePoint servicePoint)
 49   
     {
 50  6
         super(servicePoint);
 51   
     }
 52   
 
 53   
     class CleanupListener implements ThreadCleanupListener
 54   
     {
 55   
         // The core, wrapped by any interceptors
 56   
         private Object _service;
 57   
         // The core itself
 58   
         private Object _core;
 59   
 
 60  8
         CleanupListener(Object service, Object core)
 61   
         {
 62  8
             _service = service;
 63  8
             _core = core;
 64   
         }
 65   
 
 66  2
         public void threadDidCleanup()
 67   
         {
 68   
             // Orhpan this object
 69  2
             _notifier.removeThreadCleanupListener(this);
 70   
 
 71  2
             unbindServiceFromCurrentThread();
 72   
 
 73  2
             if (_core instanceof Discardable)
 74   
             {
 75  1
                 Discardable d = (Discardable) _core;
 76   
 
 77  1
                 d.threadDidDiscardService();
 78   
             }
 79   
         }
 80   
     }
 81   
 
 82   
     /**
 83   
      * Used to store the active service for the current thread.
 84   
      */
 85   
     private ThreadLocal _activeService;
 86   
 
 87   
     /**
 88   
      * Always returns the service proxy.
 89   
      */
 90  6
     public synchronized Object getService()
 91   
     {
 92   
         // _activeService will be null on first invocation; a good
 93   
         // time to create it, the proxy, and find the notifier.
 94   
 
 95  6
         if (_activeService == null)
 96   
         {
 97  6
             _activeService = new ThreadLocal();
 98   
 
 99  6
             Module module = getServicePoint().getModule();
 100   
 
 101  6
             _notifier =
 102   
                 (ThreadEventNotifier) module.getService(
 103   
                     HiveMind.THREAD_EVENT_NOTIFIER_SERVICE,
 104   
                     ThreadEventNotifier.class);
 105   
 
 106  6
             _serviceProxy = createServiceProxy();
 107   
         }
 108   
 
 109  6
         return _serviceProxy;
 110   
     }
 111   
 
 112   
     /**
 113   
      * Creates a proxy class for the service and then constructs the class itself.
 114   
      */
 115  6
     private Object createServiceProxy()
 116   
     {
 117  6
         if (_log.isDebugEnabled())
 118  3
             _log.debug(
 119   
                 "Creating ThreadedProxy for service " + getServicePoint().getExtensionPointId());
 120   
 
 121  6
         return ProxyUtils.createDelegatingProxy(
 122   
             "ThreadedProxy",
 123   
             this,
 124   
             "getServiceImplementationForCurrentThread",
 125   
             getServicePoint(),
 126   
             getServicePoint().getShutdownCoordinator());
 127   
     }
 128   
 
 129   
     /**
 130   
      * Invoked by the proxy to return 
 131   
      * the active service impl for this thread,
 132   
      * constructing it as necessary.
 133   
      */
 134  17
     public Object getServiceImplementationForCurrentThread()
 135   
     {
 136  17
         Object result = _activeService.get();
 137   
 
 138  17
         if (result == null)
 139  8
             result = constructServiceForCurrentThread();
 140   
 
 141  17
         return result;
 142   
     }
 143   
 
 144  8
     private Object constructServiceForCurrentThread()
 145   
     {
 146  8
         try
 147   
         {
 148  8
             Object core = constructCoreServiceImplementation();
 149  8
             Object result = addInterceptors(core);
 150   
 
 151  8
             if (core instanceof RegistryShutdownListener)
 152  1
                 _log.error(ServiceModelMessages.registryCleanupIgnored(getServicePoint()));
 153   
 
 154  8
             _notifier.addThreadCleanupListener(new CleanupListener(result, core));
 155   
 
 156  8
             _activeService.set(result);
 157   
 
 158  8
             return result;
 159   
         }
 160   
         catch (Exception ex)
 161   
         {
 162  0
             throw new ApplicationRuntimeException(
 163   
                 ServiceModelMessages.unableToConstructService(getServicePoint(), ex),
 164   
                 ex);
 165   
         }
 166   
     }
 167   
 
 168  2
     private void unbindServiceFromCurrentThread()
 169   
     {
 170  2
         _activeService.set(null);
 171   
     }
 172   
 
 173   
     /**
 174   
      * Invokes {@link #getServiceImplementationForCurrentThread()} to force the creation
 175   
      * of the service implementation.
 176   
      */
 177   
 
 178  1
     public void instantiateService()
 179   
     {
 180  1
         getServiceImplementationForCurrentThread();
 181   
     }
 182   
 
 183   
 }
 184