| /******************************************************************************* |
| * Copyright (c) 2000, 2004 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.help.internal.base; |
| import java.io.*; |
| import java.nio.channels.*; |
| import java.util.*; |
| |
| import org.eclipse.core.runtime.*; |
| import org.eclipse.help.internal.appserver.*; |
| import org.eclipse.osgi.util.NLS; |
| |
| /** |
| * Help application. Starts webserver and help web application for use by |
| * infocenter and stand-alone help. Application takes a parameter "mode", that |
| * can take values: "infocenter" - when help system should run as infocenter, |
| * "standalone" - when help system should run as standalone. |
| */ |
| public class HelpApplication implements IPlatformRunnable, IExecutableExtension { |
| private static final String APPLICATION_LOCK_FILE = ".applicationlock"; //$NON-NLS-1$ |
| private static final int STATUS_EXITTING = 0; |
| private static final int STATUS_RESTARTING = 2; |
| private static final int STATUS_RUNNING = 1; |
| private static int status = STATUS_RUNNING; |
| private File metadata; |
| private FileLock lock; |
| /** |
| * Causes help service to stop and exit |
| */ |
| public static void stop() { |
| status = STATUS_EXITTING; |
| if (BaseHelpSystem.MODE_STANDALONE == BaseHelpSystem.getMode()) { |
| // UI loop may be sleeping if no SWT browser is up |
| DisplayUtils.wakeupUI(); |
| } |
| } |
| /** |
| * Causes help service to exit and start again |
| */ |
| public static void restart() { |
| if (status != STATUS_EXITTING) { |
| status = STATUS_RESTARTING; |
| } |
| } |
| /** |
| * Runs help service application. |
| */ |
| public Object run(Object args) throws Exception { |
| if (status == STATUS_RESTARTING) { |
| return EXIT_RESTART; |
| } |
| |
| metadata = new File(Platform.getLocation().toFile(), ".metadata/"); //$NON-NLS-1$ |
| if (!BaseHelpSystem.ensureWebappRunning()) { |
| System.out |
| .println(NLS.bind(HelpBaseResources.HelpApplication_couldNotStart, Platform.getLogFileLocation().toOSString())); |
| return EXIT_OK; |
| } |
| |
| if (status == STATUS_RESTARTING) { |
| return EXIT_RESTART; |
| |
| } |
| writeHostAndPort(); |
| obtainLock(); |
| |
| if (BaseHelpSystem.MODE_STANDALONE == BaseHelpSystem.getMode()) { |
| //try running UI loop if possible |
| DisplayUtils.runUI(); |
| } |
| //run a headless loop; |
| while (status == STATUS_RUNNING) { |
| try { |
| Thread.sleep(100); |
| } catch (InterruptedException ie) { |
| break; |
| } |
| } |
| releaseLock(); |
| if (status == STATUS_RESTARTING) { |
| return EXIT_RESTART; |
| } else { |
| return EXIT_OK; |
| } |
| } |
| /** |
| * @see IExecutableExtension |
| */ |
| public void setInitializationData(IConfigurationElement configElement, |
| String propertyName, Object data) { |
| String value = (String) ((Map) data).get("mode"); //$NON-NLS-1$ |
| if ("infocenter".equalsIgnoreCase(value)) { //$NON-NLS-1$ |
| BaseHelpSystem.setMode(BaseHelpSystem.MODE_INFOCENTER); |
| } else if ("standalone".equalsIgnoreCase(value)) { //$NON-NLS-1$ |
| BaseHelpSystem.setMode(BaseHelpSystem.MODE_STANDALONE); |
| } |
| } |
| private void writeHostAndPort() throws IOException { |
| Properties p = new Properties(); |
| p.put("host", WebappManager.getHost()); //$NON-NLS-1$ |
| p.put("port", "" + WebappManager.getPort()); //$NON-NLS-1$ //$NON-NLS-2$ |
| |
| File hostPortFile = new File(metadata, ".connection"); //$NON-NLS-1$ |
| hostPortFile.deleteOnExit(); |
| FileOutputStream out = null; |
| try { |
| out = new FileOutputStream(hostPortFile); |
| p.store(out, null); |
| } finally { |
| if (out != null) { |
| try { |
| out.close(); |
| } catch (IOException ioe2) { |
| } |
| } |
| } |
| |
| } |
| private void obtainLock() { |
| File lockFile = new File(metadata, APPLICATION_LOCK_FILE); |
| try { |
| RandomAccessFile raf = new RandomAccessFile(lockFile, "rw"); //$NON-NLS-1$ |
| lock = raf.getChannel().lock(); |
| } catch (IOException ioe) { |
| lock = null; |
| } |
| } |
| private void releaseLock() { |
| if (lock != null) { |
| try { |
| lock.channel().close(); |
| } catch (IOException ioe) { |
| } |
| } |
| } |
| public static boolean isRunning() { |
| return status == STATUS_RUNNING; |
| } |
| } |