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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 | |||||||||||||||
StrategyFactory.java | 90% | 97.6% | 100% | 96.6% |
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// Copyright 2004, 2005 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.lib.strategy;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.Modifier;
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import java.util.Iterator;
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import java.util.List;
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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.ServiceImplementationFactory;
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import org.apache.hivemind.ServiceImplementationFactoryParameters;
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import org.apache.hivemind.lib.util.StrategyRegistry;
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import org.apache.hivemind.lib.util.StrategyRegistryImpl;
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import org.apache.hivemind.service.ClassFab;
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import org.apache.hivemind.service.ClassFabUtils;
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import org.apache.hivemind.service.ClassFactory;
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import org.apache.hivemind.service.MethodIterator;
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import org.apache.hivemind.service.MethodSignature;
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/**
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* Implementation of the <code>hivemind.lib.StrategyFactory</code> service that constructs a
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* service where the first parameter of each method is used to selecte a strategy from an
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* {@link org.apache.hivemind.lib.util.StrategyRegistry}. The method invocation is then delegated
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* to the strategy instance.
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* <p>
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* The service factory parameter defines a configuration (of
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* {@link org.apache.hivemind.lib.strategy.StrategyContribution}s) that provide the mapping from
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* Java classes (or interfaces) to adapter instances.
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*
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* @author Howard M. Lewis Ship
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* @since 1.1
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*/
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public class StrategyFactory implements ServiceImplementationFactory |
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{ |
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private ClassFactory _classFactory;
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public Object createCoreServiceImplementation(
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ServiceImplementationFactoryParameters factoryParameters) |
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{ |
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StrategyRegistry ar = new StrategyRegistryImpl();
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buildRegistry(factoryParameters, ar); |
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Class implClass = buildImplementationClass(factoryParameters); |
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try
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{ |
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Constructor c = implClass.getConstructors()[0]; |
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return c.newInstance(new Object[] |
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{ ar }); |
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} |
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catch (Exception ex)
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{ |
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throw new ApplicationRuntimeException(ex.getMessage(), HiveMind |
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.getLocation(factoryParameters.getFirstParameter()), ex); |
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} |
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} |
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// package private for testing purposes
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void buildRegistry(ServiceImplementationFactoryParameters factoryParameters, StrategyRegistry ar)
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{ |
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Class serviceInterface = factoryParameters.getServiceInterface(); |
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StrategyParameter p = (StrategyParameter) factoryParameters.getFirstParameter(); |
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List contributions = p.getContributions(); |
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Iterator i = contributions.iterator(); |
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while (i.hasNext())
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{ |
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StrategyContribution c = (StrategyContribution) i.next(); |
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try
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{ |
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Object adapter = c.getStrategy(); |
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if (!serviceInterface.isAssignableFrom(adapter.getClass()))
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throw new ClassCastException(StrategyMessages.strategyWrongInterface(adapter, c |
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.getRegisterClass(), serviceInterface)); |
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ar.register(c.getRegisterClass(), adapter); |
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} |
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catch (Exception ex)
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{ |
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factoryParameters.getErrorLog().error(ex.getMessage(), c.getLocation(), ex); |
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} |
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} |
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} |
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// package private for testing purposes
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private Class buildImplementationClass(ServiceImplementationFactoryParameters factoryParameters)
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{ |
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String name = ClassFabUtils.generateClassName(factoryParameters.getServiceInterface()); |
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return buildImplementationClass(factoryParameters, name);
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} |
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// package private for testing purposes
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Class buildImplementationClass(ServiceImplementationFactoryParameters factoryParameters, |
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String name) |
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{ |
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Class serviceInterface = factoryParameters.getServiceInterface(); |
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ClassFab cf = _classFactory.newClass(name, Object.class);
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cf.addInterface(serviceInterface); |
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cf.addField("_registry", StrategyRegistry.class); |
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cf.addConstructor(new Class[]
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{ StrategyRegistry.class }, null, "_registry = $1;"); |
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// TODO: Should we add a check for $1 == null?
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cf.addMethod(Modifier.PRIVATE, new MethodSignature(serviceInterface, "_getStrategy", |
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new Class[]
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{ Object.class }, null), "return (" + serviceInterface.getName() |
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+ ") _registry.getStrategy($1.getClass());");
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MethodIterator i = new MethodIterator(serviceInterface);
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while (i.hasNext())
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{ |
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MethodSignature sig = i.next(); |
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if (proper(sig))
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{ |
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addAdaptedMethod(cf, sig); |
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} |
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else
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{ |
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ClassFabUtils.addNoOpMethod(cf, sig); |
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factoryParameters.getErrorLog().error( |
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StrategyMessages.improperServiceMethod(sig), |
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HiveMind.getLocation(factoryParameters.getFirstParameter()), |
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null);
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} |
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} |
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if (!i.getToString())
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ClassFabUtils.addToStringMethod(cf, StrategyMessages.toString(factoryParameters |
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.getServiceId(), serviceInterface)); |
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return cf.createClass();
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} |
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private void addAdaptedMethod(ClassFab cf, MethodSignature sig) |
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{ |
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String body = "return ($r) _getStrategy($1)." + sig.getName() + "($$);"; |
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cf.addMethod(Modifier.PUBLIC, sig, body); |
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} |
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/**
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* A "proper" method is one with at least one parameter and whose first parameter is an object
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* (not primitive) type.
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*/
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private boolean proper(MethodSignature sig) |
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{ |
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Class[] parameterTypes = sig.getParameterTypes(); |
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return parameterTypes != null && parameterTypes.length > 0 |
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&& !parameterTypes[0].isPrimitive(); |
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} |
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public void setClassFactory(ClassFactory classFactory) |
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{ |
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_classFactory = classFactory; |
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} |
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} |
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