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30 day Evaluation Version distributed via the Maven Jar Repository. Clover is not free. You have 30 days to evaluate it. Please visit http://www.thecortex.net/clover to obtain a licensed version of Clover | |||||||||||||||||||
Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
ThreadedServiceModel.java | 90% | 96.8% | 100% | 96% |
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// Copyright 2004 The Apache Software Foundation
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package org.apache.hivemind.impl.servicemodel;
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import org.apache.hivemind.ApplicationRuntimeException;
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import org.apache.hivemind.Discardable;
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import org.apache.hivemind.HiveMind;
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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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/**
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* Like
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* {@link org.apache.hivemind.impl.SingletonServiceModel},
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* this method returns a proxy (implementing the service interface); unlike
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* SingletonServiceModel, it <em>always</em> returns the proxy.
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* Invoking a service method on the proxy constructs a service implementation
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* and binds it to the current thread.
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*
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* @author Howard Lewis Ship
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*/
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public final class ThreadedServiceModel extends AbstractServiceModelImpl |
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{ |
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/**
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* Name of a method in the deferred proxy that is used to obtain
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* the constructed service.
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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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public ThreadedServiceModel(ConstructableServicePoint servicePoint)
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{ |
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super(servicePoint);
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} |
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class CleanupListener implements ThreadCleanupListener |
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{ |
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// The core itself
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private Object _core;
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CleanupListener(Object core) |
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{ |
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_core = core; |
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} |
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public void threadDidCleanup() |
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{ |
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// Orhpan this object
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_notifier.removeThreadCleanupListener(this);
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unbindServiceFromCurrentThread(); |
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if (_core instanceof Discardable) |
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{ |
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Discardable d = (Discardable) _core; |
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d.threadDidDiscardService(); |
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} |
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} |
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} |
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/**
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* Used to store the active service for the current thread.
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*/
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private ThreadLocal _activeService;
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/**
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* Always returns the service proxy.
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*/
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public synchronized Object getService() |
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{ |
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// _activeService will be null on first invocation; a good
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// time to create it, the proxy, and find the notifier.
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if (_activeService == null) |
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{ |
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_activeService = new ThreadLocal();
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Module module = getServicePoint().getModule(); |
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_notifier = |
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(ThreadEventNotifier) module.getService( |
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HiveMind.THREAD_EVENT_NOTIFIER_SERVICE, |
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ThreadEventNotifier.class);
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_serviceProxy = createServiceProxy(); |
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} |
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// The result is an interceptor stack, where the final (most deeply nested) object
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// is the serviceProxy. The serviceProxy obtains the instance for the current thread
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// and delegates to it. This is a little bit different than SingletonServiceModel, which
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// creates a pair of proxies so as to defer creation of the interceptors as well. In both
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// cases, the interceptors are only created once.
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return _serviceProxy;
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} |
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/**
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* Creates a proxy instance for the service, and returns it, wrapped in any
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* interceptors for the service.
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*/
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private Object createServiceProxy()
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{ |
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if (_log.isDebugEnabled())
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_log.debug( |
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"Creating ThreadedProxy for service " + getServicePoint().getExtensionPointId());
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Object proxy = |
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ProxyUtils.createDelegatingProxy( |
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"ThreadedProxy",
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this,
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"getServiceImplementationForCurrentThread",
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getServicePoint(), |
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getServicePoint().getShutdownCoordinator()); |
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return addInterceptors(proxy);
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} |
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/**
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* Invoked by the proxy to return
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* the active service impl for this thread,
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* constructing it as necessary.
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*/
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public Object getServiceImplementationForCurrentThread()
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{ |
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Object result = _activeService.get(); |
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if (result == null) |
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result = constructServiceForCurrentThread(); |
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return result;
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} |
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private synchronized Object constructServiceForCurrentThread() |
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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 (core instanceof RegistryShutdownListener) |
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_log.error(ServiceModelMessages.registryCleanupIgnored(getServicePoint())); |
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_notifier.addThreadCleanupListener(new CleanupListener(core));
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_activeService.set(core); |
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return core;
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} |
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catch (Exception ex)
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{ |
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throw new ApplicationRuntimeException( |
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ServiceModelMessages.unableToConstructService(getServicePoint(), ex), |
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ex); |
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} |
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} |
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private void unbindServiceFromCurrentThread() |
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{ |
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_activeService.set(null);
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} |
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/**
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* Invokes {@link #getServiceImplementationForCurrentThread()} to force the creation
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* of the service implementation.
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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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} |
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