Apache Commons Daemon 1.0.12 发布

Commons Daemon 可以帮你实现将一个普通的 Java 应用变成系统的一个后台服务。

例如 Tomcat 就是利用这个项目来实现作为 Linux 和 Windows 的服务启动和停止的

Apache Commons Daemon 1.0.12 发布了，主要是修复了在 1.0.11 中发现的 bug。

/**   * 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");          }      }  }