com.github.robozonky.app.runtime.DaemonShutdownHook Maven / Gradle / Ivy
/*
* Copyright 2019 The RoboZonky Project
*
* Licensed 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 com.github.robozonky.app.runtime;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
class DaemonShutdownHook extends Thread {
private static final Logger LOGGER = LogManager.getLogger(DaemonShutdownHook.class);
private final ShutdownEnabler shutdownEnabler;
private final Lifecycle lifecycle;
public DaemonShutdownHook(final Lifecycle handler, final ShutdownEnabler shutdownEnabler) {
this.shutdownEnabler = shutdownEnabler;
this.lifecycle = handler;
}
@Override
public void run() {
LOGGER.debug("Shutdown requested through {}.", lifecycle);
// will release the main thread and thus terminate the daemon
lifecycle.resumeToShutdown();
// only allow to shut down after the daemon has been closed by the app
try {
shutdownEnabler.waitUntilTriggered();
} finally {
LOGGER.debug("Shutdown allowed.");
}
}
}