Clover coverage report - Code Coverage for hivemind release 1.1-alpha-2
Coverage timestamp: Wed Feb 23 2005 09:59:04 EST
file stats: LOC: 260   Methods: 17
NCLOC: 155   Classes: 2
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 Source file Conditionals Statements Methods TOTAL
PooledServiceModel.java 90.9% 98.2% 100% 96.8%
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.impl.servicemodel;
 16   
 
 17   
 import java.util.ArrayList;
 18   
 import java.util.List;
 19   
 
 20   
 import org.apache.hivemind.ApplicationRuntimeException;
 21   
 import org.apache.hivemind.HiveMind;
 22   
 import org.apache.hivemind.PoolManageable;
 23   
 import org.apache.hivemind.ShutdownCoordinator;
 24   
 import org.apache.hivemind.events.RegistryShutdownListener;
 25   
 import org.apache.hivemind.impl.ConstructableServicePoint;
 26   
 import org.apache.hivemind.impl.ProxyUtils;
 27   
 import org.apache.hivemind.internal.Module;
 28   
 import org.apache.hivemind.service.ThreadCleanupListener;
 29   
 import org.apache.hivemind.service.ThreadEventNotifier;
 30   
 
 31   
 /**
 32   
  * Similar to the
 33   
  * {@link org.apache.hivemind.impl.servicemodel.ThreadedServiceModel threaded service model},
 34   
  * except that, once created, services are pooled for later use.
 35   
  * 
 36   
  * @author Howard Lewis Ship
 37   
  */
 38   
 public class PooledServiceModel extends AbstractServiceModelImpl
 39   
 {
 40   
     /**
 41   
      * Name of a method in the deferred proxy that is used to obtain the constructed service.
 42   
      */
 43   
     protected static final String SERVICE_ACCESSOR_METHOD_NAME = "_service";
 44   
 
 45   
     private Object _serviceProxy;
 46   
 
 47   
     private ThreadEventNotifier _notifier;
 48   
 
 49   
     private ThreadLocal _activeService;
 50   
 
 51   
     private List _servicePool;
 52   
 
 53   
     /** @since 1.1 */
 54   
 
 55   
     private Class _serviceInterface;
 56   
 
 57   
     /**
 58   
      * Shared, null implementation of PoolManageable.
 59   
      */
 60   
     private static final PoolManageable NULL_MANAGEABLE = new PoolManageable()
 61   
     {
 62  404
         public void activateService()
 63   
         {
 64   
         }
 65   
 
 66  401
         public void passivateService()
 67   
         {
 68   
         }
 69   
     };
 70   
 
 71   
     private class PooledService implements ThreadCleanupListener
 72   
     {
 73   
         private Object _core;
 74   
 
 75   
         private PoolManageable _managed;
 76   
 
 77   
         /**
 78   
          * @param service
 79   
          *            the full service implementation, including any interceptors
 80   
          * @param core
 81   
          *            the core service implementation, which may optionally implement
 82   
          *            {@link PoolManageable}
 83   
          */
 84  44
         PooledService(Object core)
 85   
         {
 86  44
             _core = core;
 87   
 
 88  44
             if (core instanceof PoolManageable)
 89  1
                 _managed = (PoolManageable) core;
 90   
             else
 91  43
                 _managed = NULL_MANAGEABLE;
 92   
         }
 93   
 
 94  402
         public void threadDidCleanup()
 95   
         {
 96  402
             unbindPooledServiceFromCurrentThread(this);
 97   
         }
 98   
 
 99  406
         void activate()
 100   
         {
 101  406
             _managed.activateService();
 102   
         }
 103   
 
 104  402
         void passivate()
 105   
         {
 106  402
             _managed.passivateService();
 107   
         }
 108   
 
 109   
         /**
 110   
          * Returns the configured service implementation.
 111   
          */
 112  410
         public Object getService()
 113   
         {
 114  410
             return _core;
 115   
         }
 116   
 
 117   
     }
 118   
 
 119  6
     public PooledServiceModel(ConstructableServicePoint servicePoint)
 120   
     {
 121  6
         super(servicePoint);
 122   
 
 123  6
         _serviceInterface = servicePoint.getServiceInterface();
 124   
     }
 125   
 
 126  6
     public synchronized Object getService()
 127   
     {
 128  6
         if (_notifier == null)
 129   
         {
 130  6
             Module module = getServicePoint().getModule();
 131   
 
 132  6
             _notifier = (ThreadEventNotifier) module.getService(
 133   
                     HiveMind.THREAD_EVENT_NOTIFIER_SERVICE,
 134   
                     ThreadEventNotifier.class);
 135   
         }
 136   
 
 137  6
         if (_serviceProxy == null)
 138  6
             _serviceProxy = constructServiceProxy();
 139   
 
 140  6
         return _serviceProxy;
 141   
     }
 142   
 
 143   
     /**
 144   
      * Constructs the service proxy and returns it, wrapped in any interceptors.
 145   
      */
 146  6
     private Object constructServiceProxy()
 147   
     {
 148  6
         ConstructableServicePoint servicePoint = getServicePoint();
 149   
 
 150  6
         if (_log.isDebugEnabled())
 151  1
             _log.debug("Creating PooledProxy for service " + servicePoint.getExtensionPointId());
 152   
 
 153  6
         Object proxy = ProxyUtils.createDelegatingProxy(
 154   
                 "PooledProxy",
 155   
                 this,
 156   
                 "getServiceImplementationForCurrentThread",
 157   
                 servicePoint);
 158   
 
 159  6
         Object intercepted = addInterceptors(proxy);
 160   
 
 161  6
         RegistryShutdownListener outerProxy = ProxyUtils
 162   
                 .createOuterProxy(intercepted, servicePoint);
 163   
 
 164  6
         ShutdownCoordinator coordinator = servicePoint.getShutdownCoordinator();
 165   
 
 166  6
         coordinator.addRegistryShutdownListener(outerProxy);
 167   
 
 168  6
         return outerProxy;
 169   
     }
 170   
 
 171  410
     public synchronized Object getServiceImplementationForCurrentThread()
 172   
     {
 173  410
         if (_activeService == null)
 174  6
             _activeService = new ThreadLocal();
 175   
 
 176  410
         PooledService pooled = (PooledService) _activeService.get();
 177   
 
 178  410
         if (pooled == null)
 179   
         {
 180  406
             pooled = obtainPooledService();
 181   
 
 182  406
             pooled.activate();
 183   
 
 184  406
             _notifier.addThreadCleanupListener(pooled);
 185  406
             _activeService.set(pooled);
 186   
         }
 187   
 
 188  410
         return pooled.getService();
 189   
     }
 190   
 
 191  406
     private PooledService obtainPooledService()
 192   
     {
 193  406
         PooledService result = getServiceFromPool();
 194   
 
 195  406
         if (result == null)
 196  44
             result = constructPooledService();
 197   
 
 198  406
         return result;
 199   
     }
 200   
 
 201  406
     private synchronized PooledService getServiceFromPool()
 202   
     {
 203  406
         int count = _servicePool == null ? 0 : _servicePool.size();
 204   
 
 205  406
         if (count == 0)
 206  44
             return null;
 207   
 
 208  362
         return (PooledService) _servicePool.remove(count - 1);
 209   
     }
 210   
 
 211  402
     private synchronized void returnServiceToPool(PooledService pooled)
 212   
     {
 213  402
         if (_servicePool == null)
 214  4
             _servicePool = new ArrayList();
 215   
 
 216  402
         _servicePool.add(pooled);
 217   
     }
 218   
 
 219  44
     private synchronized PooledService constructPooledService()
 220   
     {
 221  44
         try
 222   
         {
 223  44
             Object core = constructCoreServiceImplementation();
 224   
 
 225   
             // This is related to bean services.
 226   
 
 227  44
             if (!_serviceInterface.isInstance(core))
 228  1
                 core = constructBridgeProxy(core);
 229   
 
 230  44
             return new PooledService(core);
 231   
         }
 232   
         catch (Exception ex)
 233   
         {
 234  0
             throw new ApplicationRuntimeException(ServiceModelMessages.unableToConstructService(
 235   
                     getServicePoint(),
 236   
                     ex), ex);
 237   
         }
 238   
     }
 239   
 
 240  402
     private void unbindPooledServiceFromCurrentThread(PooledService pooled)
 241   
     {
 242  402
         _notifier.removeThreadCleanupListener(pooled);
 243   
 
 244  402
         _activeService.set(null);
 245   
 
 246  402
         pooled.passivate();
 247   
 
 248  402
         returnServiceToPool(pooled);
 249   
     }
 250   
 
 251   
     /**
 252   
      * Invokes {@link #getServiceImplementationForCurrentThread()}to instantiate an instance of the
 253   
      * service.
 254   
      */
 255  1
     public void instantiateService()
 256   
     {
 257  1
         getServiceImplementationForCurrentThread();
 258   
     }
 259   
 
 260   
 }