/**
* Copyright 2016 Yahoo Inc.
*
* 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.yahoo.pulsar.broker;
import java.lang.reflect.Method;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import org.apache.zookeeper.ZooKeeper.States;
import org.slf4j.ILoggerFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.yahoo.pulsar.zookeeper.ZooKeeperSessionWatcher.ShutdownService;
import io.netty.util.concurrent.DefaultThreadFactory;
public class MessagingServiceShutdownHook extends Thread implements ShutdownService {
private static final Logger LOG = LoggerFactory.getLogger(MessagingServiceShutdownHook.class);
private static final String LogbackLoggerContextClassName = "ch.qos.logback.classic.LoggerContext";
private PulsarService service = null;
public MessagingServiceShutdownHook(PulsarService service) {
this.service = service;
}
@Override
public void run() {
if (service.getConfiguration() != null) {
LOG.info("messaging service shutdown hook started, lookup port="
+ service.getConfiguration().getWebServicePort() + ", broker url=" + service.getBrokerServiceUrl());
}
ExecutorService executor = Executors.newSingleThreadExecutor(new DefaultThreadFactory("shutdown-thread"));
try {
CompletableFuture<Void> future = new CompletableFuture<>();
executor.execute(() -> {
try {
service.close();
future.complete(null);
} catch (PulsarServerException e) {
future.completeExceptionally(e);
}
});
future.get(service.getConfiguration().getBrokerShutdownTimeoutMs(), TimeUnit.MILLISECONDS);
LOG.info("Completed graceful shutdown. Exiting");
} catch (TimeoutException e) {
LOG.warn("Graceful shutdown timeout expired. Closing now");
} catch (Exception e) {
LOG.error("Failed to perform graceful shutdown, Exiting anyway", e);
} finally {
immediateFlushBufferedLogs();
// always put system to halt immediately
Runtime.getRuntime().halt(0);
}
}
@Override
public void shutdown(int exitCode) {
try {
// Try to close ZK session to ensure all ephemeral locks gets released immediately
if (service != null) {
if (service.getZkClient().getState() != States.CLOSED) {
service.getZkClient().close();
}
}
} catch (Exception e) {
LOG.warn(e.getMessage(), e);
}
LOG.info("Invoking Runtime.halt({})", exitCode);
immediateFlushBufferedLogs();
Runtime.getRuntime().halt(exitCode);
}
public static void immediateFlushBufferedLogs() {
ILoggerFactory loggerFactory = LoggerFactory.getILoggerFactory();
if (loggerFactory.getClass().getName().equals(LogbackLoggerContextClassName)) {
// Use reflection to force the flush on the logger
try {
Class<?> logbackLoggerContextClass = Class.forName(LogbackLoggerContextClassName);
Method stop = logbackLoggerContextClass.getMethod("stop");
stop.invoke(loggerFactory);
} catch (Throwable t) {
LOG.info("Failed to flush logs", t);
}
}
}
}