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/*
* 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;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Constructor;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.tuscany.sca.contribution.Contribution;
import org.apache.tuscany.sca.contribution.ModelFactoryExtensionPoint;
import org.apache.tuscany.sca.contribution.processor.PackageProcessor;
import org.apache.tuscany.sca.contribution.service.ContributionException;
import org.apache.tuscany.sca.extensibility.ServiceDeclaration;
import org.apache.tuscany.sca.extensibility.ServiceDiscovery;
/**
* Default implementation of a contribution classloader provider extension point.
*
* @version $Rev$ $Date$
*/
public class DefaultContributionClassloaderProviderExtensionPoint implements ContributionClassloaderProviderExtensionPoint {
private HashMap<String, ContributionClassLoaderProvider> providers = new HashMap<String, ContributionClassLoaderProvider>();
private boolean loaded;
/**
* Constructs a new DefaultModelFactoryExtensionPoint.
*/
public DefaultContributionClassloaderProviderExtensionPoint() {
}
/**
* Add a contribution classloader provider extension.
*
* @param provider The provider to add
*/
public void addProvider(ContributionClassLoaderProvider provider){
providers.put(provider.getContributionType(), provider);
}
/**
* Remove a contribution classloader provider extension.
*
* @param provider The provider to remove
*/
public void removeProvider(ContributionClassLoaderProvider provider){
providers.remove(provider.getContributionType());
}
/**
* Get a contribution classloader provider for the given contribution type.
* @param contributionType the lookup key
* @return The provider
*/
public ContributionClassLoaderProvider getProvider(String contributionType){
loadProviders();
return providers.get(contributionType);
}
private synchronized void loadProviders() {
if (loaded)
return;
// Get the processor service declarations
Set<ServiceDeclaration> processorDeclarations;
try {
processorDeclarations = ServiceDiscovery.getInstance().getServiceDeclarations(ContributionClassLoaderProvider.class);
} catch (IOException e) {
throw new IllegalStateException(e);
}
for (ServiceDeclaration processorDeclaration: processorDeclarations) {
Map<String, String> attributes = processorDeclaration.getAttributes();
// Load a URL artifact processor
String contributionType = attributes.get("type");
// Create a processor wrapper and register it
ContributionClassLoaderProvider provider = new LazyContributionClassLoaderProvider(contributionType, processorDeclaration);
addProvider(provider);
}
loaded = true;
}
/**
* A facade for package processors.
*/
private static class LazyContributionClassLoaderProvider implements ContributionClassLoaderProvider {
private ServiceDeclaration processorDeclaration;
private String contributionType;
private ContributionClassLoaderProvider provider;
private LazyContributionClassLoaderProvider(String contributionType, ServiceDeclaration processorDeclaration) {
this.processorDeclaration = processorDeclaration;
this.contributionType = contributionType;
}
public String getContributionType() {
return contributionType;
}
@SuppressWarnings("unchecked")
public ClassLoader getClassLoader(Contribution contribution, ClassLoader parent){
if (provider == null) {
try {
Class<ContributionClassLoaderProvider> providerClass = (Class<ContributionClassLoaderProvider>)processorDeclaration.loadClass();
Constructor<ContributionClassLoaderProvider> constructor = providerClass.getConstructor();
provider = constructor.newInstance();
} catch (Exception e) {
throw new IllegalStateException(e);
}
}
return provider.getClassLoader(contribution, parent);
}
}
}
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