Dear Wiki user, You have subscribed to a wiki page or wiki category on "Commons Wiki" for change notification.
The "Daemon" page has been changed by ChrisMcKay: http://wiki.apache.org/commons/Daemon?action=diff&rev1=9&rev2=10 ... + == Examples == + + === Combined java class for Windows and Linux === + + The following Java code works when called from both a Windows service (using prunsrv) and Linux (using jsvc). The Windows start and stop taken from Christopher Pierce's blog at http://blog.platinumsolutions.com/node/234 + + {{{ + /** + * Launch the Engine from a variety of sources, either through a main() or invoked through + * Apache Daemon. + */ + public class EngineLauncher implements Daemon { + private static final Log4J log = Log4J.getLog(); + private static Engine engine = null; + + private static EngineLauncher engineLauncherInstance = new EngineLauncher(); + + /** + * The Java entry point. + * @param args Command line arguments, all ignored. + */ + public static void main(String[] args) { + // the main routine is only here so I can also run the app from the command line + engineLauncherInstance.initialize(); + + Scanner sc = new Scanner(System.in); + // wait until receive stop command from keyboard + System.out.printf("Enter 'stop' to halt: "); + while(!sc.nextLine().toLowerCase().equals("stop")); + + if (!engine.isStopped()) { + engineLauncherInstance.terminate(); + } + + } + + /** + * Static methods called by prunsrv to start/stop + * the Windows service. Pass the argument "start" + * to start the service, and pass "stop" to + * stop the service. + * + * Taken lock, stock and barrel from Christopher Pierce's blog at http://blog.platinumsolutions.com/node/234 + * + * @param args Arguments from prunsrv command line + **/ + public static void windowsService(String args[]) { + String cmd = "start"; + if (args.length > 0) { + cmd = args[0]; + } + + if ("start".equals(cmd)) { + engineLauncherInstance.windowsStart(); + } + else { + engineLauncherInstance.windowsStop(); + } + } + + public void windowsStart() { + log.debug("windowsStart called"); + initialize(); + while (!engine.isStopped()) { + // don't return until stopped + synchronized(this) { + try { + this.wait(60000); // wait 1 minute and check if stopped + } + catch(InterruptedException ie){} + } + } + } + + public void windowsStop() { + log.debug("windowsStop called"); + terminate(); + synchronized(this) { + // stop the start loop + this.notify(); + } + } + + // Implementing the Daemon interface is not required for Windows but is for Linux + @Override + public void init(DaemonContext arg0) throws Exception { + log.debug("Daemon init"); + } + + @Override + public void start() { + log.debug("Daemon start"); + initialize(); + } + + @Override + public void stop() { + log.debug("Daemon stop"); + terminate(); + } + + @Override + public void destroy() { + log.debug("Daemon destroy"); + } + + /** + * Do the work of starting the engine + */ + private void initialize() { + if (engine == null) { + log.info("Starting the Engine"); + ... spawn threads etc + } + } + + /** + * Cleanly stop the engine. + */ + public void terminate() { + if (engine != null) { + log.info("Stopping the Engine"); + engine.stop(); + log.info("Engine stopped"); + } + } + } + + + }}} + --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org For additional commands, e-mail: dev-h...@commons.apache.org
