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| package org.apache.hivemind.impl.servicemodel; |
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| |
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| import java.util.ArrayList; |
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| import java.util.List; |
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| |
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| import org.apache.hivemind.ApplicationRuntimeException; |
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| import org.apache.hivemind.HiveMind; |
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| import org.apache.hivemind.PoolManageable; |
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| import org.apache.hivemind.ShutdownCoordinator; |
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| import org.apache.hivemind.events.RegistryShutdownListener; |
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| import org.apache.hivemind.impl.ConstructableServicePoint; |
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| import org.apache.hivemind.impl.ProxyUtils; |
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| import org.apache.hivemind.internal.Module; |
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| import org.apache.hivemind.service.ThreadCleanupListener; |
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| import org.apache.hivemind.service.ThreadEventNotifier; |
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| public class PooledServiceModel extends AbstractServiceModelImpl |
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| { |
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| protected static final String SERVICE_ACCESSOR_METHOD_NAME = "_service"; |
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| private Object _serviceProxy; |
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| private ThreadEventNotifier _notifier; |
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| private ThreadLocal _activeService; |
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| private List _servicePool; |
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| private Class _serviceInterface; |
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| private static final PoolManageable NULL_MANAGEABLE = new PoolManageable() |
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| { |
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| public void activateService()
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| { |
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| } |
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| public void passivateService()
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| { |
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| } |
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| }; |
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| |
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| private class PooledService implements ThreadCleanupListener |
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| { |
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| private Object _core; |
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| private PoolManageable _managed; |
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| PooledService(Object core)
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| { |
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| _core = core;
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| if (core instanceof PoolManageable)
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| _managed = (PoolManageable) core;
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| else |
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| _managed = NULL_MANAGEABLE;
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| } |
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| public void threadDidCleanup()
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| { |
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| unbindPooledServiceFromCurrentThread(this);
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| } |
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| void activate()
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| { |
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| _managed.activateService();
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| } |
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| void passivate()
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| { |
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| _managed.passivateService();
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| } |
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| public Object getService()
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| { |
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| return _core;
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| } |
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| } |
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| public PooledServiceModel(ConstructableServicePoint servicePoint)
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| { |
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| super(servicePoint);
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| _serviceInterface = servicePoint.getServiceInterface();
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| } |
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| public synchronized Object getService()
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| { |
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| if (_notifier == null)
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| { |
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| Module module = getServicePoint().getModule();
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| _notifier = (ThreadEventNotifier) module.getService(
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| HiveMind.THREAD_EVENT_NOTIFIER_SERVICE, |
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| ThreadEventNotifier.class); |
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| } |
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| if (_serviceProxy == null)
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| _serviceProxy = constructServiceProxy();
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| return _serviceProxy;
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| } |
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| private Object constructServiceProxy()
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| { |
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| ConstructableServicePoint servicePoint = getServicePoint();
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| if (_log.isDebugEnabled())
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| _log.debug("Creating PooledProxy for service " + servicePoint.getExtensionPointId());
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| Object proxy = ProxyUtils.createDelegatingProxy(
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| "PooledProxy", |
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| this, |
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| "getServiceImplementationForCurrentThread", |
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| servicePoint); |
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| Object intercepted = addInterceptors(proxy);
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| RegistryShutdownListener outerProxy = ProxyUtils
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| .createOuterProxy(intercepted, servicePoint); |
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| ShutdownCoordinator coordinator = servicePoint.getShutdownCoordinator();
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| coordinator.addRegistryShutdownListener(outerProxy);
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| return outerProxy;
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| } |
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| public synchronized Object getServiceImplementationForCurrentThread()
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| { |
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| if (_activeService == null)
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| _activeService = new ThreadLocal();
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| PooledService pooled = (PooledService) _activeService.get();
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| if (pooled == null)
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| { |
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| pooled = obtainPooledService();
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| pooled.activate();
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| _notifier.addThreadCleanupListener(pooled);
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| _activeService.set(pooled);
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| } |
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| return pooled.getService();
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| } |
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| private PooledService obtainPooledService()
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| { |
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| PooledService result = getServiceFromPool();
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| if (result == null)
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| result = constructPooledService();
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| return result;
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| } |
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| private synchronized PooledService getServiceFromPool()
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| { |
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| int count = _servicePool == null ? 0 : _servicePool.size();
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| if (count == 0)
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| return null;
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| return (PooledService) _servicePool.remove(count - 1);
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| } |
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| private synchronized void returnServiceToPool(PooledService pooled)
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| { |
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| if (_servicePool == null)
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| _servicePool = new ArrayList();
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| _servicePool.add(pooled);
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| } |
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| private synchronized PooledService constructPooledService()
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| { |
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| try
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| { |
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| Object core = constructCoreServiceImplementation();
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| if (!_serviceInterface.isInstance(core))
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| core = constructBridgeProxy(core);
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| if( core instanceof RegistryShutdownListener )
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| { |
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| getShutdownCoordinatorService().addRegistryShutdownListener( ( RegistryShutdownListener )core );
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| } |
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| return new PooledService(core);
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| } |
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| catch (Exception ex) |
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| { |
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| throw new ApplicationRuntimeException(ServiceModelMessages.unableToConstructService(
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| getServicePoint(), |
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| ex), ex); |
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| } |
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| } |
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| private void unbindPooledServiceFromCurrentThread(PooledService pooled)
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| { |
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| _notifier.removeThreadCleanupListener(pooled);
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| _activeService.set(null);
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| pooled.passivate();
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| returnServiceToPool(pooled);
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| } |
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| public void instantiateService()
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| { |
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| getServiceImplementationForCurrentThread();
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| } |
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| } |