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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 | |||||||||||||||
ServicePointImpl.java | 81.8% | 92.2% | 100% | 91.5% |
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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;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.List;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.apache.hivemind.ApplicationRuntimeException;
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import org.apache.hivemind.ClassResolver;
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import org.apache.hivemind.HiveMind;
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import org.apache.hivemind.ShutdownCoordinator;
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import org.apache.hivemind.internal.ServiceImplementationConstructor;
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import org.apache.hivemind.internal.ServiceInterceptorContribution;
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import org.apache.hivemind.internal.ServiceModel;
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import org.apache.hivemind.internal.ServiceModelFactory;
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import org.apache.hivemind.order.Orderer;
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import org.apache.hivemind.schema.Schema;
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import org.apache.hivemind.util.ToStringBuilder;
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/**
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* Abstract implementation of {@link org.apache.hivemind.internal.ServicePoint}.
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* Provides some of the machinery for creating new service instances, delegating
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* most of it to the {@link org.apache.hivemind.internal.ServiceModel} instace
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* for the service.
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*
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* @author Howard Lewis Ship
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*/
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public final class ServicePointImpl |
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extends AbstractExtensionPoint
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implements ConstructableServicePoint
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{ |
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private Object _service;
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private boolean _building; |
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private String _serviceInterfaceName;
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private Class _serviceInterface;
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private ServiceImplementationConstructor _serviceConstructor;
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private List _interceptorContributions;
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private boolean _interceptorsOrdered; |
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private Schema _parametersSchema;
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private String _serviceModel;
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private ShutdownCoordinator _shutdownCoordinator;
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private ServiceModel _serviceModelObject;
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protected void extendDescription(ToStringBuilder builder) |
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{ |
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if (_service != null) |
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builder.append("service", _service);
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builder.append("serviceInterfaceName", _serviceInterfaceName);
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builder.append("factoryContribution", _serviceConstructor);
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builder.append("interceptorContributions", _interceptorContributions);
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builder.append("parametersSchema", _parametersSchema);
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builder.append("serviceModel", _serviceModel);
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if (_building)
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builder.append("building", _building);
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} |
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public void addInterceptorContribution(ServiceInterceptorContribution contribution) |
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{ |
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if (_interceptorContributions == null) |
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_interceptorContributions = new ArrayList();
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_interceptorContributions.add(contribution); |
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} |
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public synchronized Class getServiceInterface() |
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{ |
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if (_serviceInterface == null) |
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_serviceInterface = lookupServiceInterface(); |
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return _serviceInterface;
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} |
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private Class lookupServiceInterface()
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{ |
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ClassResolver resolver = getModule().getClassResolver(); |
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Class result = null;
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try
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{ |
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result = resolver.findClass(_serviceInterfaceName); |
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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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ImplMessages.badInterface(_serviceInterfaceName, getExtensionPointId()), |
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getLocation(), |
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ex); |
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} |
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if (!result.isInterface())
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throw new ApplicationRuntimeException( |
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ImplMessages.interfaceRequired(_serviceInterfaceName, getExtensionPointId()), |
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getLocation(), |
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null);
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return result;
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} |
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public void setServiceConstructor(ServiceImplementationConstructor contribution) |
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{ |
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_serviceConstructor = contribution; |
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} |
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public void setServiceInterfaceName(String string) |
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{ |
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_serviceInterfaceName = string; |
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} |
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public void setParametersSchema(Schema schema) |
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{ |
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_parametersSchema = schema; |
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} |
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public Schema getParametersSchema()
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{ |
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return _parametersSchema;
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} |
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public ServiceImplementationConstructor getServiceConstructor()
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{ |
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return _serviceConstructor;
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} |
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/**
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* Invoked by {@link #getService(Class)} to get a service implementation
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* from the {@link ServiceModel}.
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*
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* <p>
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* TODO: I'm concerned that this synchronized method could cause a deadlock. It would take
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* a LOT (mutually dependent services in multiple threads being realized at the same time).
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*
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*
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*/
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private synchronized Object getService() |
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{ |
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if (_service == null) |
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{ |
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if (_building)
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throw new ApplicationRuntimeException(ImplMessages.recursiveServiceBuild(this)); |
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_building = true;
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try
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{ |
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ServiceModelFactory factory = getModule().getServiceModelFactory(getServiceModel()); |
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_serviceModelObject = factory.createServiceModelForService(this);
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_service = _serviceModelObject.getService(); |
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} |
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finally
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{ |
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_building = false;
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} |
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} |
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return _service;
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} |
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public Object getService(Class serviceInterface)
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{ |
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Object result = getService(); |
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if (!serviceInterface.isAssignableFrom(result.getClass()))
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{ |
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throw new ApplicationRuntimeException( |
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ImplMessages.serviceWrongInterface(this, serviceInterface),
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getLocation(), |
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null);
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} |
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return result;
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} |
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public String getServiceModel()
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{ |
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return _serviceModel;
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} |
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public void setServiceModel(String model) |
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{ |
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_serviceModel = model; |
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} |
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public void clearConstructorInformation() |
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{ |
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_serviceConstructor = null;
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_interceptorContributions = null;
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} |
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// Hm. Does this need to be synchronized?
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public List getOrderedInterceptorContributions()
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{ |
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if (!_interceptorsOrdered)
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{ |
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_interceptorContributions = orderInterceptors(); |
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_interceptorsOrdered = true;
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} |
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return _interceptorContributions;
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} |
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private List orderInterceptors()
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{ |
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if (HiveMind.isEmpty(_interceptorContributions))
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return null; |
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// Any error logging should go to the extension point
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// we're constructing.
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Log log = LogFactory.getLog(getExtensionPointId()); |
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Orderer orderer = |
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new Orderer(log, getModule().getErrorHandler(), ImplMessages.interceptorContribution());
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Iterator i = _interceptorContributions.iterator(); |
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while (i.hasNext())
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{ |
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ServiceInterceptorContribution sic = (ServiceInterceptorContribution) i.next(); |
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// Sort them into runtime excecution order. When we build
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// the interceptor stack we'll apply them in reverse order,
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// building outward from the core service implementation.
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orderer.add( |
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sic, |
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sic.getFactoryServiceId(), |
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sic.getPrecedingInterceptorIds(), |
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sic.getFollowingInterceptorIds()); |
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} |
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return orderer.getOrderedObjects();
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} |
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public ShutdownCoordinator getShutdownCoordinator()
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{ |
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return _shutdownCoordinator;
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} |
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public void setShutdownCoordinator(ShutdownCoordinator coordinator) |
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{ |
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_shutdownCoordinator = coordinator; |
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} |
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/**
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* Forces the service into existence.
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*/
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public void forceServiceInstantiation() |
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{ |
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getService(); |
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_serviceModelObject.instantiateService(); |
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} |
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public Log getServiceLog()
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{ |
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return LogFactory.getLog(getExtensionPointId());
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} |
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} |
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