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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);
+
+}