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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.extension.helper.impl;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import org.apache.tuscany.sca.core.ExtensionPointRegistry;
import org.apache.tuscany.sca.extensibility.ServiceDeclaration;
import org.apache.tuscany.sca.extensibility.ServiceDiscovery;
/**
* Discovers Activators in the classpath using the J2SE
* jar file extensions for Service Provider discovery
*
* @version $Rev$ $Date$
*/
public class DiscoveryUtils {
@SuppressWarnings("unchecked")
public static <T> List<T> discoverActivators(Class<T> activatorClass, ExtensionPointRegistry registry) {
List<T> activators;
try {
Set<ServiceDeclaration> activatorClasses =
ServiceDiscovery.getInstance().getServiceDeclarations(activatorClass);
activators = new ArrayList<T>();
for (ServiceDeclaration declaration : activatorClasses) {
try {
Class<T> c = (Class<T>)declaration.loadClass();
activators.add(c.cast(instantiateActivator(c, registry)));
} catch (Throwable e) {
e.printStackTrace(); // TODO: log
}
}
} catch (IOException e) {
throw new RuntimeException(e);
}
return activators;
}
static Object instantiateActivator(Class activator, ExtensionPointRegistry registry) {
Constructor[] cs = activator.getConstructors();
if (cs.length != 1) {
throw new RuntimeException("Activator must have only one constructors");
}
Class<?>[] paramTypes = cs[0].getParameterTypes();
Object[] extensions = new Object[paramTypes.length];
for (int i = 0; i < paramTypes.length; i++) {
if ("org.apache.tuscany.sca.host.http.ServletHost".equals(paramTypes[i].getName())) {
extensions[i] = getServletHost(registry);
} else {
extensions[i] = registry.getExtensionPoint(paramTypes[i]);
}
}
try {
return cs[0].newInstance(extensions);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
private static Object getServletHost(ExtensionPointRegistry registry) {
try {
Class<?> servletHostEPClass = Class.forName("org.apache.tuscany.sca.host.http.ServletHostExtensionPoint");
Object servletHostEP = registry.getExtensionPoint(servletHostEPClass);
Class<?> extensibleServletHost = Class.forName("org.apache.tuscany.sca.host.http.ExtensibleServletHost");
return extensibleServletHost.getConstructor(new Class[] {servletHostEPClass}).newInstance(servletHostEP);
} catch (ClassNotFoundException e) {
throw new RuntimeException(e);
} catch (IllegalArgumentException e) {
throw new RuntimeException(e);
} catch (SecurityException e) {
throw new RuntimeException(e);
} catch (InstantiationException e) {
throw new RuntimeException(e);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
} catch (InvocationTargetException e) {
throw new RuntimeException(e);
} catch (NoSuchMethodException e) {
throw new RuntimeException(e);
}
}
}
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