org.springframework.boot.web.embedded.jetty.GracefulShutdown Maven / Gradle / Ivy
/*
* Copyright 2012-2021 the original author or authors.
*
* 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
*
* https://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 org.springframework.boot.web.embedded.jetty;
import java.lang.reflect.Method;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.function.Supplier;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.eclipse.jetty.server.Connector;
import org.eclipse.jetty.server.Server;
import org.springframework.boot.web.server.GracefulShutdownCallback;
import org.springframework.boot.web.server.GracefulShutdownResult;
import org.springframework.core.log.LogMessage;
import org.springframework.util.ReflectionUtils;
/**
* Handles Jetty graceful shutdown.
*
* @author Andy Wilkinson
*/
final class GracefulShutdown {
private static final Log logger = LogFactory.getLog(JettyWebServer.class);
private final Server server;
private final Supplier activeRequests;
private volatile boolean shuttingDown = false;
GracefulShutdown(Server server, Supplier activeRequests) {
this.server = server;
this.activeRequests = activeRequests;
}
void shutDownGracefully(GracefulShutdownCallback callback) {
logger.info("Commencing graceful shutdown. Waiting for active requests to complete");
boolean jetty10 = isJetty10();
for (Connector connector : this.server.getConnectors()) {
shutdown(connector, !jetty10);
}
this.shuttingDown = true;
new Thread(() -> awaitShutdown(callback), "jetty-shutdown").start();
}
@SuppressWarnings("unchecked")
private void shutdown(Connector connector, boolean getResult) {
Future result;
try {
result = connector.shutdown();
}
catch (NoSuchMethodError ex) {
Method shutdown = ReflectionUtils.findMethod(connector.getClass(), "shutdown");
result = (Future) ReflectionUtils.invokeMethod(shutdown, connector);
}
if (getResult) {
try {
result.get();
}
catch (InterruptedException ex) {
Thread.currentThread().interrupt();
}
catch (ExecutionException ex) {
// Continue
}
}
}
private boolean isJetty10() {
try {
return CompletableFuture.class.equals(Connector.class.getMethod("shutdown").getReturnType());
}
catch (Exception ex) {
return false;
}
}
private void awaitShutdown(GracefulShutdownCallback callback) {
while (this.shuttingDown && this.activeRequests.get() > 0) {
sleep(100);
}
this.shuttingDown = false;
long activeRequests = this.activeRequests.get();
if (activeRequests == 0) {
logger.info("Graceful shutdown complete");
callback.shutdownComplete(GracefulShutdownResult.IDLE);
}
else {
logger.info(LogMessage.format("Graceful shutdown aborted with %d request(s) still active", activeRequests));
callback.shutdownComplete(GracefulShutdownResult.REQUESTS_ACTIVE);
}
}
private void sleep(long millis) {
try {
Thread.sleep(millis);
}
catch (InterruptedException ex) {
Thread.currentThread().interrupt();
}
}
void abort() {
this.shuttingDown = false;
}
}