From 132aa8a77685ec92bc90c03f987650d275a7b639 Mon Sep 17 00:00:00 2001 From: lresende Date: Mon, 30 Sep 2013 06:59:11 +0000 Subject: 2.0.1 RC1 release tag git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@1527464 13f79535-47bb-0310-9956-ffa450edef68 --- .../java/impl/ClassLoaderModelResolver.java | 193 +++++++++++++++++++++ 1 file changed, 193 insertions(+) create mode 100644 sca-java-2.x/tags/2.0.1-RC1/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/ClassLoaderModelResolver.java (limited to 'sca-java-2.x/tags/2.0.1-RC1/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/ClassLoaderModelResolver.java') diff --git a/sca-java-2.x/tags/2.0.1-RC1/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/ClassLoaderModelResolver.java b/sca-java-2.x/tags/2.0.1-RC1/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/ClassLoaderModelResolver.java new file mode 100644 index 0000000000..bb7ae3f29d --- /dev/null +++ b/sca-java-2.x/tags/2.0.1-RC1/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/ClassLoaderModelResolver.java @@ -0,0 +1,193 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + */ + +package org.apache.tuscany.sca.contribution.java.impl; + +import java.io.IOException; +import java.lang.ref.WeakReference; +import java.lang.reflect.Field; +import java.net.URL; +import java.net.URLClassLoader; +import java.util.ArrayList; +import java.util.Collections; +import java.util.Enumeration; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.Vector; + +import org.apache.tuscany.sca.contribution.Contribution; +import org.apache.tuscany.sca.contribution.Import; +import org.apache.tuscany.sca.contribution.java.JavaImport; +import org.apache.tuscany.sca.contribution.processor.ProcessorContext; +import org.apache.tuscany.sca.contribution.resolver.ClassReference; +import org.apache.tuscany.sca.contribution.resolver.DefaultDelegatingModelResolver; +import org.apache.tuscany.sca.contribution.resolver.ModelResolver; +import org.apache.tuscany.sca.core.FactoryExtensionPoint; +import org.apache.tuscany.sca.extensibility.ServiceDiscovery; + +/** + * A Model Resolver for ClassReferences. + * + * @version $Rev$ $Date$ + */ +public class ClassLoaderModelResolver extends URLClassLoader implements ModelResolver { + private WeakReference contribution; + private ProcessorContext context; + private Map importResolvers = new HashMap(); + + // a space to pass back the contribution that was used to resolve + // a class via an import + private Contribution contributionContainingClass; + + private static ClassLoader parentClassLoader(Contribution contribution) { + if (contribution.getClassLoader() != null) { + return contribution.getClassLoader(); + } + ClassLoader parentClassLoader = ServiceDiscovery.getInstance().getContextClassLoader(); + return parentClassLoader; + } + + private static URL[] getContributionURLs(final Contribution contribution) throws IOException { + if (contribution.getClassLoader() != null) { + // Do not include the contribution url + return new URL[0]; + } + List urls = new ArrayList(); + urls.add(new URL(contribution.getLocation())); + urls.addAll(ContributionHelper.getNestedJarUrls(contribution)); + return urls.toArray(new URL[urls.size()]); + } + + public ClassLoaderModelResolver(final Contribution contribution, FactoryExtensionPoint modelFactories) throws IOException { + super(getContributionURLs(contribution), parentClassLoader(contribution)); + this.contribution = new WeakReference(contribution); + // Index Java import resolvers by package name + Map> resolverMap = new HashMap>(); + for (Import import_: this.contribution.get().getImports()) { + if (import_ instanceof JavaImport) { + JavaImport javaImport = (JavaImport)import_; + List resolvers = resolverMap.get(javaImport.getPackage()); + if (resolvers == null) { + resolvers = new ArrayList(); + resolverMap.put(javaImport.getPackage(), resolvers); + } + resolvers.add(javaImport.getModelResolver()); + } + } + + // Create a delegating model resolver for each imported package + for (Map.Entry> entry: resolverMap.entrySet()) { + importResolvers.put(entry.getKey(), new DefaultDelegatingModelResolver(entry.getValue())); + } + } + + public void addModel(Object resolved, ProcessorContext context) { + throw new IllegalStateException(); + } + + public Object removeModel(Object resolved, ProcessorContext context) { + throw new IllegalStateException(); + } + + public T resolveModel(Class modelClass, T unresolved, ProcessorContext context) { + if (!(unresolved instanceof ClassReference)) { + return unresolved; + } + + try { + this.context = context; + contributionContainingClass = contribution.get(); + + // Load the class and return a class reference for it + String className = ((ClassReference)unresolved).getClassName(); + Class clazz = Class.forName(className, false, this); + ClassReference classReference = new ClassReference(clazz); + classReference.setContributionContainingClass(contributionContainingClass); + contributionContainingClass = null; + return modelClass.cast(classReference); + + } catch (ClassNotFoundException e) { + return unresolved; + } finally { + contributionContainingClass = null; + } + } + + @Override + public URL findResource(String name) { + + //TODO delegate to the Java import resolvers + + URL url = super.findResource(name); + return url; + } + + @Override + public Enumeration findResources(String name) throws IOException { + + //TODO delegate to the Java import resolvers + //Enumeration importedResources; + + Enumeration resources = super.findResources(name); + List allResources = new ArrayList(); + //for (; importedResources.hasMoreElements(); ) { + // allResources.add(importedResources.nextElement()); + //} + for (; resources.hasMoreElements(); ) { + allResources.add(resources.nextElement()); + } + return Collections.enumeration(allResources); + } + + @Override + protected Class findClass(String name) throws ClassNotFoundException { + + // Extract the package name + int d = name.lastIndexOf('.'); + String packageName; + if (d != -1) { + packageName = name.substring(0, d); + } else { + packageName = null; + } + + // First try to load the class using the Java import resolvers + ModelResolver importResolver = importResolvers.get(packageName); + if (importResolver != null) { + ClassReference classReference = importResolver.resolveModel(ClassReference.class, new ClassReference(name), context); + if (!classReference.isUnresolved()) { + contributionContainingClass = classReference.getContributionContainingClass(); + return classReference.getJavaClass(); + } + } + + // Next, try to load the class from the current contribution + Class clazz = super.findClass(name); + return clazz; + } + + public void clear() { + contribution = null; + contributionContainingClass = null; + context = null; + importResolvers = null; + } + +} -- cgit v1.2.3