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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.node;
import java.lang.reflect.InvocationTargetException;
import org.osoa.sca.CallableReference;
import org.osoa.sca.ServiceReference;
import org.osoa.sca.ServiceRuntimeException;
/**
* A factory for SCA processing nodes. An SCA processing node can be loaded
* with an SCA composite and the SCA contributions required by the composite.
*
* @version $Rev$ $Date$
*/
public abstract class SCANodeFactory {
public static class NodeProxy implements SCANode, SCAClient {
private Object node;
private NodeProxy(Object node) {
super();
this.node = node;
}
public static <T> T createProxy(Class<T> type, Object node) {
try {
return type.getDeclaredConstructor(Object.class).newInstance(node);
} catch (Exception e) {
throw new IllegalArgumentException(e);
}
}
public <B, R extends CallableReference<B>> R cast(B target) throws IllegalArgumentException {
try {
return (R)node.getClass().getMethod("cast", Object.class).invoke(node, target);
} catch (Throwable e) {
handleException(e);
return null;
}
}
public <B> B getService(Class<B> businessInterface, String serviceName) {
try {
return (B)node.getClass().getMethod("getService", Class.class, String.class).invoke(node,
businessInterface,
serviceName);
} catch (Throwable e) {
handleException(e);
return null;
}
}
public <B> ServiceReference<B> getServiceReference(Class<B> businessInterface, String serviceName) {
try {
return (ServiceReference<B>)node.getClass().getMethod("getServiceReference", Class.class, String.class)
.invoke(node, businessInterface, serviceName);
} catch (Throwable e) {
handleException(e);
return null;
}
}
public void start() {
try {
node.getClass().getMethod("start").invoke(node);
} catch (Throwable e) {
handleException(e);
}
}
public void stop() {
try {
node.getClass().getMethod("stop").invoke(node);
} catch (Throwable e) {
handleException(e);
}
}
private static void handleException(Throwable ex) {
if (ex instanceof InvocationTargetException) {
ex = ((InvocationTargetException)ex).getTargetException();
}
if (ex instanceof RuntimeException) {
throw (RuntimeException)ex;
}
if (ex instanceof Error) {
throw (Error)ex;
} else {
throw new RuntimeException(ex);
}
}
}
/**
* Returns a new SCA node factory instance.
*
* @return a new SCA node factory
*/
public static SCANodeFactory newInstance() {
SCANodeFactory scaNodeFactory = null;
try {
// final ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
// Use reflection APIs to call ServiceDiscovery to avoid hard dependency to tuscany-extensibility
try {
Class<?> discoveryClass =
Class.forName("org.apache.tuscany.sca.extensibility.ServiceDiscovery");
Object instance = discoveryClass.getMethod("getInstance").invoke(null);
Class<?> factoryImplClass =
(Class<?>)discoveryClass.getMethod("loadFirstServiceClass", Class.class)
.invoke(instance, SCANodeFactory.class);
if (factoryImplClass != null) {
scaNodeFactory = (SCANodeFactory)factoryImplClass.newInstance();
return scaNodeFactory;
}
} catch (ClassNotFoundException e) {
// Ignore
}
// Fail back to default impl
String className = "org.apache.tuscany.sca.node.impl.NodeFactoryImpl";
Class<?> cls = Class.forName(className);
scaNodeFactory = (SCANodeFactory)cls.newInstance();
return scaNodeFactory;
} catch (Exception e) {
throw new ServiceRuntimeException(e);
}
}
/**
* Create a SCA node based on the discovery of the contribution on the classpath.
*
* @return a new SCA node.
*/
public abstract SCANode createSCANode();
/**
* Create a SCA node based on the discovery of the contribution on the classpath for the
* given classloader. This method should be treated a convinient shortcut with the following
* assumptions:
* <ul>
* <li>This is a standalone application and there is a deployable composite file on the classpath.
* <li>There is only one contribution which contains the deployable composite file physically in its packaging hierarchy.
* </ul>
* @param compositeURI The URI of the composite file relative to the root of the enclosing contribution
* @param classLoader The ClassLoader used to load the composite file as a resource. If the value is null,
* then thread context classloader will be used
* @return A newly created SCA node
*/
public abstract SCANode createSCANodeFromClassLoader(String compositeURI, ClassLoader classLoader);
/**
* Creates a new SCA node from the configuration URL
*
* @param configurationURL the URL of the node configuration which is the ATOM feed
* that contains the URI of the composite and a collection of URLs for the contributions
*
* @return a new SCA node.
*/
public abstract SCANode createSCANodeFromURL(String configurationURL);
/**
* Creates a new SCA node.
*
* @param compositeURI the URI of the composite to use
* @param contributions the URI of the contributions that provides the composites and related
* artifacts. If the list is empty, then we will use the thread context classloader to discover
* the contribution on the classpath
*
* @return a new SCA node.
*/
public abstract SCANode createSCANode(String compositeURI, SCAContribution... contributions);
/**
* Creates a new SCA node.
*
* @param compositeURI the URI of the composite to use
* @param compositeContent the XML content of the composite to use
* @param contributions the URI of the contributions that provides the composites and related artifacts
* @return a new SCA node.
*/
public abstract SCANode createSCANode(String compositeURI,
String compositeContent,
SCAContribution... contributions);
}
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