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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.service;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.List;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArrayList;
import org.apache.tuscany.sca.contribution.ModelFactoryExtensionPoint;
import org.apache.tuscany.sca.core.ExtensionPointRegistry;
import org.apache.tuscany.sca.extensibility.ServiceDeclaration;
import org.apache.tuscany.sca.extensibility.ServiceDiscovery;
/**
* Default implementation of a contribution listener extension point.
*
* @version $Rev$ $Date$
*/
public class DefaultContributionListenerExtensionPoint implements ContributionListenerExtensionPoint {
private List<ContributionListener> listeners = new CopyOnWriteArrayList<ContributionListener>();
private boolean loadedListeners;
private ModelFactoryExtensionPoint modelFactories;
/**
* Constructs a new DefaultContributionListenerExtensionPoint.
*
*/
public DefaultContributionListenerExtensionPoint(ModelFactoryExtensionPoint modelFactories) {
this.modelFactories = modelFactories;
}
/**
* Constructs a new DefaultContributionListenerExtensionPoint.
*
*/
public DefaultContributionListenerExtensionPoint(ExtensionPointRegistry extensionPoints) {
this.modelFactories = extensionPoints.getExtensionPoint(ModelFactoryExtensionPoint.class);
}
public void addContributionListener(ContributionListener listener) {
listeners.add(listener);
}
public List<ContributionListener> getContributionListeners() {
loadListeners();
return listeners;
}
public void removeContributionListener(ContributionListener listener) {
listeners.remove(listener);
}
/**
* Dynamically load listeners declared under META-INF/services
*/
@SuppressWarnings("unchecked")
private synchronized void loadListeners() {
if (loadedListeners)
return;
// Get the listener service declarations
Set<ServiceDeclaration> listenerDeclarations;
try {
listenerDeclarations = ServiceDiscovery.getInstance().getServiceDeclarations(ContributionListener.class);
} catch (IOException e) {
throw new IllegalStateException(e);
}
// Load and instantiate the listeners
for (ServiceDeclaration listenerDeclaration: listenerDeclarations) {
ContributionListener listener;
try {
Class<ContributionListener> listenerClass = (Class<ContributionListener>)listenerDeclaration.loadClass();
try {
Constructor<ContributionListener> constructor = listenerClass.getConstructor(ModelFactoryExtensionPoint.class);
try {
listener = constructor.newInstance(modelFactories);
} catch (InvocationTargetException e) {
throw new IllegalArgumentException(e);
}
} catch (NoSuchMethodException e) {
listener = listenerClass.newInstance();
}
} catch (ClassNotFoundException e) {
throw new IllegalArgumentException(e);
} catch (InstantiationException e) {
throw new IllegalArgumentException(e);
} catch (IllegalAccessException e) {
throw new IllegalArgumentException(e);
}
addContributionListener(listener);
}
loadedListeners = true;
}
}
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