Java tutorial
/* * 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.launcher; import static org.apache.tuscany.sca.node.launcher.NodeLauncherUtil.node; import java.io.File; import java.io.IOException; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.net.MalformedURLException; import java.net.URL; import java.util.List; import java.util.logging.Level; import java.util.logging.Logger; import org.apache.commons.cli.CommandLine; import org.apache.commons.cli.CommandLineParser; import org.apache.commons.cli.HelpFormatter; import org.apache.commons.cli.Option; import org.apache.commons.cli.Options; import org.apache.commons.cli.PosixParser; /** * A launcher for SCA nodes in JSE. * * Agruments: * [-c <compositeURI>]: The composite URI * [-t <ttl>]: Time to live in milliseconds before the node is started * contribution1 ... contributionN: A list of contribution files or URLs * * @version $Rev: 883155 $ $Date: 2009-11-22 22:17:59 +0000 (Sun, 22 Nov 2009) $ */ public class NodeLauncher { static final Logger logger = Logger.getLogger(NodeLauncher.class.getName()); /** * Constructs a new node launcher. */ private NodeLauncher() { } /** * Returns a new launcher instance. * * @return a new launcher instance */ public static NodeLauncher newInstance() { return new NodeLauncher(); } /** * 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. * @throws LauncherException */ public <T> T createNodeFromURL(String configurationURL) throws LauncherException { return (T) node(configurationURL, null, null, null, null); } /** * 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. * @throws LauncherException */ public <T> T createNode(String compositeURI, Contribution... contributions) throws LauncherException { return (T) node(null, compositeURI, null, contributions, null); } /** * 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. * @throws LauncherException */ public <T> T createNode(String compositeURI, String compositeContent, Contribution... contributions) throws LauncherException { return (T) node(null, compositeURI, compositeContent, contributions, null); } /** * Create a SCA node based on the discovery of the contribution on the classpath for the * given classloader. This method should be treated a convenient 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 <T> T createNodeFromClassLoader(String compositeURI, ClassLoader classLoader) throws LauncherException { return (T) node(null, compositeURI, null, null, classLoader); } static Options getCommandLineOptions() { Options options = new Options(); Option opt1 = new Option("c", "composite", true, "URI for the composite"); opt1.setArgName("compositeURI"); options.addOption(opt1); Option opt2 = new Option("n", "node", true, "URI for the node configuration"); opt2.setArgName("nodeConfigurationURI"); options.addOption(opt2); Option opt3 = new Option("t", "ttl", true, "Time to live"); opt3.setArgName("timeToLiveInMilliseconds"); options.addOption(opt3); Option opt4 = new Option("s", "service", true, "Service to invoke (componentName/serviceName#operation(arg0,...,argN)"); options.addOption(opt4); return options; } public static void main(String[] args) throws Exception { CommandLineParser parser = new PosixParser(); Options options = getCommandLineOptions(); CommandLine cli = parser.parse(options, args); Object node = null; ShutdownThread shutdown = null; try { while (true) { if (cli.hasOption("node")) { // Create a node from a configuration URI String configurationURI = cli.getOptionValue("node"); logger.info("SCA Node configuration: " + configurationURI); // Create a node launcher NodeLauncher launcher = newInstance(); node = launcher.createNodeFromURL(configurationURI); } else { // Create a node from a composite URI and a contribution location String compositeURI = cli.getOptionValue("composite"); List<String> contribs = cli.getArgList(); Contribution[] contributions = null; if (!contribs.isEmpty()) { contributions = new Contribution[contribs.size()]; int index = 0; for (String contrib : contribs) { logger.info("SCA contribution: " + contrib); URL url = null; try { url = new URL(contrib); } catch (MalformedURLException e) { url = new File(contrib).toURI().toURL(); } contributions[index] = new Contribution("contribution-" + index, url.toString()); index++; } } else { HelpFormatter formatter = new HelpFormatter(); formatter.setSyntaxPrefix("Usage: "); formatter.printHelp("java " + NodeLauncher.class.getName() + " [-c <compositeURI>]" + " [-s <service>]" + " [-t <ttl>]" + " contribution1 ... contributionN", options); return; } // Create a node launcher logger.info("SCA composite: " + compositeURI); NodeLauncher launcher = newInstance(); node = launcher.createNode(compositeURI, contributions); } logger.info("Apache Tuscany SCA Node is starting..."); // Start the node try { node.getClass().getMethod("start").invoke(node); } catch (Exception e) { logger.log(Level.SEVERE, "SCA Node could not be started", e); throw e; } logger.info("SCA Node is now started."); String service = cli.getOptionValue("service"); String regex = "(#|\\(|,|\\))"; if (service != null) { // componentName/serviceName/bindingName#methodName(arg0, ..., agrN) String tokens[] = service.split(regex); String serviceName = tokens[0]; String operationName = tokens[1]; String params[] = new String[tokens.length - 2]; System.arraycopy(tokens, 2, params, 0, params.length); logger.info("Invoking service: " + service); Method method = node.getClass().getMethod("getService", Class.class, String.class); Object proxy = method.invoke(node, null, serviceName); Object result = invoke(proxy, operationName, params); if (result != null) { logger.info("Result is: " + result); } break; } // Install a shutdown hook shutdown = new ShutdownThread(node); Runtime.getRuntime().addShutdownHook(shutdown); long ttl = Long.parseLong(cli.getOptionValue("ttl", "-1")); if (ttl >= 0) { logger.info("Waiting for " + ttl + " milliseconds ..."); Thread.sleep(ttl); // Stop the node if (node != null) { Object n = node; node = null; stopNode(n); } break; // Exit } logger.info("Press 'q' to quit, 'r' to restart."); int k = 0; try { while ((k != 'q') && (k != 'r')) { k = System.in.read(); } } catch (IOException e) { // Wait forever Object lock = new Object(); synchronized (lock) { lock.wait(); } } // Stop the node if (node != null) { Object n = node; node = null; stopNode(n); } // Quit if (k == 'q') { break; } } } catch (Exception e) { // Stop the node if (node != null) { try { Object n = node; node = null; stopNode(n); } catch (Exception e2) { } } throw e; } finally { // Remove the shutdown hook if (shutdown != null) { Runtime.getRuntime().removeShutdownHook(shutdown); } } } static Object invoke(Object proxy, String operationName, String... params) throws IllegalAccessException, InvocationTargetException { for (Method m : proxy.getClass().getMethods()) { if (m.getName().equals(operationName) && m.getParameterTypes().length == params.length) { Object parameters[] = new Object[params.length]; int i = 0; for (Class<?> type : m.getParameterTypes()) { if (type == byte.class || type == Byte.class) { parameters[i] = Byte.valueOf(params[i]); } else if (type == char.class || type == Character.class) { parameters[i] = params[i].charAt(0); } else if (type == boolean.class || type == Boolean.class) { parameters[i] = Boolean.valueOf(params[i]); } else if (type == short.class || type == Short.class) { parameters[i] = Short.valueOf(params[i]); } else if (type == int.class || type == Integer.class) { parameters[i] = Integer.valueOf(params[i]); } else if (type == long.class || type == Long.class) { parameters[i] = Long.valueOf(params[i]); } else if (type == float.class || type == Float.class) { parameters[i] = Float.valueOf(params[i]); } else if (type == double.class || type == Double.class) { parameters[i] = Double.valueOf(params[i]); } else if (type == String.class) { parameters[i] = params[i]; } else { throw new IllegalArgumentException("Parameter type is not supported: " + type); } i++; } Object result = m.invoke(proxy, parameters); return result; } } throw new IllegalArgumentException("Invalid service operation: " + operationName); } /** * Stop the given node. * * @param node * @throws Exception */ private static void stopNode(Object node) throws Exception { try { node.getClass().getMethod("stop").invoke(node); logger.info("SCA Node is now stopped."); } catch (Exception e) { logger.log(Level.SEVERE, "SCA Node could not be stopped", e); throw e; } } private static class ShutdownThread extends Thread { private Object node; public ShutdownThread(Object node) { super(); this.node = node; } @Override public void run() { try { stopNode(node); } catch (Exception e) { // Ignore } } } }