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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 | |||||||||||||||
BuilderFactory.java | 100% | 98.1% | 100% | 98.6% |
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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.service.impl;
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import java.lang.reflect.Method;
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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.ErrorHandler;
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import org.apache.hivemind.HiveMind;
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import org.apache.hivemind.Location;
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import org.apache.hivemind.ServiceImplementationFactory;
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import org.apache.hivemind.internal.Module;
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import org.apache.hivemind.service.EventLinker;
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import org.apache.hivemind.util.ConstructorUtils;
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import org.apache.hivemind.util.PropertyUtils;
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/**
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* Implementation of {@link org.apache.hivemind.ServiceImplementationFactory}
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* that can instantiate an object and then configure its properties.
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*
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* <p>
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* Some thought has been given to using bytecode generation to create properties
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* for messages, extension point id, and so forth. This is being avoided because it
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* undermines the ability to test service implemenations as POJOs, outside the
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* framework of HiveMind.
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*
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* <p>
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* Instead the service is configured by means of the implementation's
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* constructor and setter methods.
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*
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* @author Howard Lewis Ship
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*/
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public class BuilderFactory implements ServiceImplementationFactory |
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{ |
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private static final String POINT_ID = "hivemind.BuilderFactory"; |
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public Object createCoreServiceImplementation(
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String serviceId, |
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Class serviceInterface, |
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Module invokingModule, |
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List parameters) |
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{ |
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HiveMind.checkFactoryParameterCount(POINT_ID, parameters, 1); |
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Log log = LogFactory.getLog(serviceId); |
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ErrorHandler errorHandler = invokingModule.getErrorHandler(); |
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BuilderParameter parameter = (BuilderParameter) parameters.get(0); |
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Object result = instantiateCoreServiceInstance(serviceId, invokingModule, parameter); |
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setProperties(serviceId, invokingModule, parameter, result, log); |
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registerForEvents(log, errorHandler, parameter, result); |
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invokeInitializer(parameter, result, serviceId, log, invokingModule); |
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return result;
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} |
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private void registerForEvents( |
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Log log, |
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ErrorHandler eventHandler, |
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BuilderParameter parameter, |
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Object result) |
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{ |
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List eventRegistrations = parameter.getEventRegistrations(); |
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if (eventRegistrations.isEmpty())
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return;
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EventLinker linker = new EventLinkerImpl(log, eventHandler);
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Iterator i = eventRegistrations.iterator(); |
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while (i.hasNext())
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{ |
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EventRegistration er = (EventRegistration) i.next(); |
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linker.addEventListener( |
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er.getProducer(), |
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er.getEventSetName(), |
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result, |
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er.getLocation()); |
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} |
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} |
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private void setProperties( |
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String serviceId, |
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Module invokingModule, |
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BuilderParameter parameter, |
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Object target, |
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Log log) |
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{ |
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List properties = parameter.getProperties(); |
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int count = properties.size();
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for (int i = 0; i < count; i++) |
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{ |
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BuilderFacet facet = (BuilderFacet) properties.get(i); |
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String propertyName = facet.getPropertyName(); |
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// Facets that can autowire, should.
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facet.autowire(target, serviceId, invokingModule); |
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// There will be a facet for log, messages, service-id, etc. even if no
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// property name is specified, so we skip it here. In many cases, those
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// facets will have just done an autowire.
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if (propertyName == null) |
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continue;
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Class targetType = PropertyUtils.getPropertyType(target, propertyName); |
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Object value = facet.getFacetValue(serviceId, invokingModule, targetType); |
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Location location = HiveMind.getLocation(facet); |
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HiveMind.setLocation(value, location); |
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try
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{ |
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PropertyUtils.write(target, propertyName, value); |
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} |
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catch (Exception ex)
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{ |
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throw new ApplicationRuntimeException(ex.getMessage(), target, location, ex); |
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} |
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} |
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} |
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private Object instantiateCoreServiceInstance(
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String serviceId, |
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Module invokingModule, |
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BuilderParameter parameter) |
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{ |
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ClassResolver resolver = invokingModule.getClassResolver(); |
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Class serviceClass = resolver.findClass(parameter.getClassName()); |
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Object[] constructorParameters = |
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buildConstructorParameters(parameter, invokingModule, serviceId); |
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return ConstructorUtils.invokeConstructor(serviceClass, constructorParameters, parameter);
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} |
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private Object[] buildConstructorParameters(
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BuilderParameter parameter, |
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Module invokingModule, |
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String serviceId) |
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{ |
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List parameters = parameter.getParameters(); |
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int count = parameters.size();
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if (count == 0)
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return null; |
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Object[] result = new Object[count];
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for (int i = 0; i < count; i++) |
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{ |
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BuilderFacet facet = (BuilderFacet) parameters.get(i); |
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result[i] = facet.getFacetValue(serviceId, invokingModule, Object.class);
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HiveMind.setLocation(result[i], HiveMind.getLocation(facet)); |
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} |
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return result;
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} |
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private void invokeInitializer( |
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BuilderParameter parameters, |
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Object service, |
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String serviceId, |
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Log log, |
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Module module) |
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{ |
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String methodName = parameters.getInitializeMethod(); |
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if (HiveMind.isBlank(methodName))
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return;
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try
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{ |
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Class serviceClass = service.getClass(); |
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Method m = serviceClass.getMethod(methodName, null);
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m.invoke(service, null);
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} |
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catch (Exception ex)
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{ |
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module.getErrorHandler().error( |
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log, |
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ServiceMessages.unableToInitializeService( |
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serviceId, |
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methodName, |
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service.getClass(), |
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ex), |
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parameters.getLocation(), |
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ex); |
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} |
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} |
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} |
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