Examples with ServiceManager com.google.common.util.concurrent.ServiceManager used on opensource projects

Example 11 with ServiceManager

use of com.google.common.util.concurrent.ServiceManager in project incubator-gobblin by apache.

the class ServiceBasedAppLauncher method start.

/**
 * Starts the {@link ApplicationLauncher} by starting all associated services. This method also adds a shutdown hook
 * that invokes {@link #stop()} and the {@link #close()} methods. So {@link #stop()} and {@link #close()} need not be
 * called explicitly; they can be triggered during the JVM shutdown.
 */
@Override
public synchronized void start() {
    if (this.hasStarted) {
        LOG.warn("ApplicationLauncher has already started");
        return;
    }
    this.hasStarted = true;
    this.serviceManager = new ServiceManager(this.services);
    // A listener that shutdowns the application if any service fails.
    this.serviceManager.addListener(new ServiceManager.Listener() {

        @Override
        public void failure(Service service) {
            super.failure(service);
            LOG.error(String.format("Service %s has failed.", service.getClass().getSimpleName()), service.failureCause());
            try {
                service.stopAsync();
                ServiceBasedAppLauncher.this.stop();
            } catch (ApplicationException ae) {
                LOG.error("Could not shutdown services gracefully. This may cause the application to hang.");
            }
        }
    });
    Runtime.getRuntime().addShutdownHook(new Thread() {

        @Override
        public void run() {
            try {
                ServiceBasedAppLauncher.this.stop();
            } catch (ApplicationException e) {
                LOG.error("Failed to shutdown application", e);
            } finally {
                try {
                    ServiceBasedAppLauncher.this.close();
                } catch (IOException e) {
                    LOG.error("Failed to close application", e);
                }
            }
        }
    });
    LOG.info("Starting the Gobblin application and all its associated Services");
    // Start the application
    this.serviceManager.startAsync().awaitHealthy();
}