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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.core;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.apache.tuscany.sca.extensibility.ServiceDeclaration;
import org.apache.tuscany.sca.extensibility.ServiceDiscovery;
/**
* Default implementation of an extension point to hold Tuscany module activators.
*
* @version $Rev$ $Date$
*/
public class DefaultModuleActivatorExtensionPoint implements ModuleActivatorExtensionPoint {
private final static Logger logger = Logger.getLogger(DefaultModuleActivatorExtensionPoint.class.getName());
private List<ModuleActivator> activators = new ArrayList<ModuleActivator>();
private boolean loadedActivators;
/**
* Constructs a new extension point.
*/
public DefaultModuleActivatorExtensionPoint() {
}
public void addModuleActivator(ModuleActivator activator) {
activators.add(activator);
}
public List<ModuleActivator> getModuleActivators() {
loadModuleActivators();
return activators;
}
public void removeModuleActivator(Object activator) {
activators.remove(activator);
}
/**
* Dynamically load module activators declared under META-INF/services
*/
private synchronized void loadModuleActivators() {
if (loadedActivators)
return;
// Get the activator service declarations
Collection<ServiceDeclaration> activatorDeclarations;
try {
// Load the module activators by ranking
activatorDeclarations = ServiceDiscovery.getInstance().getServiceDeclarations(ModuleActivator.class.getName(), true);
} catch (IOException e) {
throw new IllegalStateException(e);
}
// Load and instantiate module activators
for (ServiceDeclaration activatorDeclaration : activatorDeclarations) {
if (logger.isLoggable(Level.FINE)) {
logger.fine("Loading " + activatorDeclaration.getClassName());
}
ModuleActivator activator = null;
try {
Class<ModuleActivator> activatorClass = (Class<ModuleActivator>)activatorDeclaration.loadClass();
Constructor<ModuleActivator> constructor = null;
try {
constructor = activatorClass.getConstructor();
activator = constructor.newInstance();
} catch (NoSuchMethodException e) {
// Try the one that takes a Map<String, String>
constructor = activatorClass.getConstructor(Map.class);
activator = constructor.newInstance(activatorDeclaration.getAttributes());
}
} catch (Throwable e) {
String optional = activatorDeclaration.getAttributes().get("optional");
if ("true".equalsIgnoreCase(optional)) {
// If the optional flag is true, just log the error
logger.log(Level.SEVERE, e.getMessage(), e);
continue;
} else {
throw new IllegalArgumentException(e);
}
}
addModuleActivator(activator);
}
loadedActivators = true;
}
}
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