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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 | |||||||||||||||
ProxyUtils.java | - | 96.8% | 75% | 94.3% |
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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.lang.reflect.Constructor;
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import java.lang.reflect.Modifier;
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import org.apache.hivemind.ApplicationRuntimeException;
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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.internal.ServiceModel;
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import org.apache.hivemind.internal.ServicePoint;
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import org.apache.hivemind.service.BodyBuilder;
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import org.apache.hivemind.service.ClassFab;
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import org.apache.hivemind.service.MethodSignature;
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/**
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* Contains some common code used to create proxies that defer to a service model method
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* for thier service.
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*
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* @author Howard Lewis Ship
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*/
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public final class ProxyUtils |
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{ |
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public static final String SERVICE_ACCESSOR_METHOD_NAME = "_service"; |
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private ProxyUtils()
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{ |
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// Prevent instantiation
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} |
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/**
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* Creates a class that implements the service interface. Implements
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* a private synchronized method, _service(), that constructs the service
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* as needed, and has each service interface method re-invoke on _service().
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* Adds a toString() method if the service interface does not define toString().
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*/
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public static Object createDelegatingProxy( |
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String type, |
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ServiceModel serviceModel, |
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String delegationMethodName, |
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ServicePoint servicePoint, |
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ShutdownCoordinator shutdownCoordinator) |
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{ |
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ProxyBuilder builder = new ProxyBuilder(type, servicePoint);
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ClassFab classFab = builder.getClassFab(); |
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addConstructor(classFab, serviceModel); |
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addServiceAccessor(classFab, delegationMethodName, servicePoint); |
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builder.addServiceMethods(SERVICE_ACCESSOR_METHOD_NAME + "()");
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Class proxyClass = classFab.createClass(); |
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try
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{ |
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Constructor c = proxyClass.getConstructor(new Class[] { serviceModel.getClass()});
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RegistryShutdownListener result = |
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(RegistryShutdownListener) c.newInstance(new Object[] { serviceModel });
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shutdownCoordinator.addRegistryShutdownListener(result); |
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return result;
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} |
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catch (Exception ex)
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{ |
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throw new ApplicationRuntimeException(ex); |
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} |
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} |
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/**
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* Adds a field, _serviceExtensionPoint, whose type
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* matches this class, and a constructor which sets
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* the field.
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*/
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private static void addConstructor(ClassFab classFab, ServiceModel model) |
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{ |
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Class modelClass = model.getClass(); |
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classFab.addField("_serviceModel", modelClass);
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classFab.addConstructor( |
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new Class[] { modelClass },
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null,
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"{ super(); _serviceModel = $1; }");
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} |
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/**
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* We
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* construct a method that always goes through this service model's
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* {@link #getServiceImplementationForCurrentThread())} method.
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*/
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private static void addServiceAccessor( |
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ClassFab classFab, |
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String serviceModelMethodName, |
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ServicePoint servicePoint) |
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{ |
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Class serviceInterface = servicePoint.getServiceInterface(); |
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classFab.addField(SERVICE_ACCESSOR_METHOD_NAME, serviceInterface); |
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classFab.addField("_shutdown", boolean.class); |
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BodyBuilder builder = new BodyBuilder();
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builder.begin(); |
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builder.addln("if (_shutdown)");
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builder.addln(" throw org.apache.hivemind.HiveMind#createRegistryShutdownException();");
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builder.add("return (");
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builder.add(serviceInterface.getName()); |
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builder.add(") _serviceModel.");
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builder.add(serviceModelMethodName); |
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builder.add("();");
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builder.end(); |
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classFab.addMethod( |
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Modifier.PRIVATE | Modifier.FINAL, |
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new MethodSignature(serviceInterface, SERVICE_ACCESSOR_METHOD_NAME, null, null), |
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builder.toString()); |
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classFab.addInterface(RegistryShutdownListener.class);
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classFab.addMethod( |
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Modifier.PUBLIC | Modifier.FINAL, |
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new MethodSignature(void.class, "registryDidShutdown", null, null), |
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"{ _serviceModel = null; _shutdown = true; }");
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} |
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} |
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