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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.util.ArrayList;
import java.util.List;
import org.apache.tuscany.sca.contribution.util.ServiceConfigurationUtil;
/**
* Default implementation of a contribution listener extension point.
*
* @version $Rev$ $Date$
*/
public class DefaultContributionListenerExtensionPoint implements ContributionListenerExtensionPoint {
private List<ContributionListener> listeners = new ArrayList<ContributionListener>();
private boolean loadedListeners;
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
*/
private void loadListeners() {
if (loadedListeners)
return;
// Get the databinding service declarations
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
List<String> listenerDeclarations;
try {
listenerDeclarations = ServiceConfigurationUtil.getServiceClassNames(classLoader, ContributionListener.class.getName());
} catch (IOException e) {
throw new IllegalStateException(e);
}
// Load data bindings
for (String listenerDeclaration: listenerDeclarations) {
ContributionListener listener;
try {
Class<ContributionListener> listenerClass = (Class<ContributionListener>)Class.forName(listenerDeclaration, true, classLoader);
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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