/**
* This file is part of Graylog2.
*
* Graylog2 is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Graylog2 is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Graylog2. If not, see <http://www.gnu.org/licenses/>.
*/
package org.graylog2.system.shutdown;
import com.google.common.util.concurrent.Uninterruptibles;
import com.google.inject.Inject;
import org.graylog2.Configuration;
import org.graylog2.initializers.BufferSynchronizerService;
import org.graylog2.plugin.ServerStatus;
import org.graylog2.shared.initializers.InputSetupService;
import org.graylog2.shared.initializers.PeriodicalsService;
import org.graylog2.shared.initializers.RestApiService;
import org.graylog2.system.activities.Activity;
import org.graylog2.system.activities.ActivityWriter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.inject.Singleton;
import java.util.concurrent.TimeUnit;
@Singleton
public class GracefulShutdown implements Runnable {
private static final Logger LOG = LoggerFactory.getLogger(GracefulShutdown.class);
private static final int SLEEP_SECS = 1;
private final Configuration configuration;
private final BufferSynchronizerService bufferSynchronizerService;
private final PeriodicalsService periodicalsService;
private final InputSetupService inputSetupService;
private final ServerStatus serverStatus;
private final ActivityWriter activityWriter;
private final RestApiService restApiService;
@Inject
public GracefulShutdown(ServerStatus serverStatus,
ActivityWriter activityWriter,
Configuration configuration,
BufferSynchronizerService bufferSynchronizerService,
PeriodicalsService periodicalsService,
InputSetupService inputSetupService,
RestApiService restApiService) {
this.serverStatus = serverStatus;
this.activityWriter = activityWriter;
this.configuration = configuration;
this.bufferSynchronizerService = bufferSynchronizerService;
this.periodicalsService = periodicalsService;
this.inputSetupService = inputSetupService;
this.restApiService = restApiService;
}
@Override
public void run() {
doRun(true);
}
public void runWithoutExit() {
doRun(false);
}
private void doRun(boolean exit) {
LOG.info("Graceful shutdown initiated.");
serverStatus.shutdown();
// Give possible load balancers time to recognize state change. State is DEAD because of HALTING.
LOG.info("Node status: [{}]. Waiting <{}sec> for possible load balancers to recognize state change.",
serverStatus.getLifecycle(),
configuration.getLoadBalancerRecognitionPeriodSeconds());
Uninterruptibles.sleepUninterruptibly(configuration.getLoadBalancerRecognitionPeriodSeconds(), TimeUnit.SECONDS);
activityWriter.write(new Activity("Graceful shutdown initiated.", GracefulShutdown.class));
/*
* Wait a second to give for example the calling REST call some time to respond
* to the client. Using a latch or something here might be a bit over-engineered.
*/
Uninterruptibles.sleepUninterruptibly(SLEEP_SECS, TimeUnit.SECONDS);
// Stop REST API service to avoid changes from outside.
restApiService.stopAsync();
// stop all inputs so no new messages can come in
inputSetupService.stopAsync();
restApiService.awaitTerminated();
inputSetupService.awaitTerminated();
// Try to flush all remaining messages from the system
bufferSynchronizerService.stopAsync().awaitTerminated();
// stop all maintenance tasks
periodicalsService.stopAsync().awaitTerminated();
// Shut down hard with no shutdown hooks running.
LOG.info("Goodbye.");
if (exit) {
System.exit(0);
}
}
}