spring GracefulShutdown 源码
springboot GracefulShutdown 代码
文件路径:/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/tomcat/GracefulShutdown.java
/*
* Copyright 2012-2020 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.tomcat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.apache.catalina.Container;
import org.apache.catalina.Service;
import org.apache.catalina.connector.Connector;
import org.apache.catalina.core.StandardContext;
import org.apache.catalina.core.StandardWrapper;
import org.apache.catalina.startup.Tomcat;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.boot.web.server.GracefulShutdownCallback;
import org.springframework.boot.web.server.GracefulShutdownResult;
/**
* Handles Tomcat graceful shutdown.
*
* @author Andy Wilkinson
*/
final class GracefulShutdown {
private static final Log logger = LogFactory.getLog(GracefulShutdown.class);
private final Tomcat tomcat;
private volatile boolean aborted = false;
GracefulShutdown(Tomcat tomcat) {
this.tomcat = tomcat;
}
void shutDownGracefully(GracefulShutdownCallback callback) {
logger.info("Commencing graceful shutdown. Waiting for active requests to complete");
new Thread(() -> doShutdown(callback), "tomcat-shutdown").start();
}
private void doShutdown(GracefulShutdownCallback callback) {
List<Connector> connectors = getConnectors();
connectors.forEach(this::close);
try {
for (Container host : this.tomcat.getEngine().findChildren()) {
for (Container context : host.findChildren()) {
while (isActive(context)) {
if (this.aborted) {
logger.info("Graceful shutdown aborted with one or more requests still active");
callback.shutdownComplete(GracefulShutdownResult.REQUESTS_ACTIVE);
return;
}
Thread.sleep(50);
}
}
}
}
catch (InterruptedException ex) {
Thread.currentThread().interrupt();
}
logger.info("Graceful shutdown complete");
callback.shutdownComplete(GracefulShutdownResult.IDLE);
}
private List<Connector> getConnectors() {
List<Connector> connectors = new ArrayList<>();
for (Service service : this.tomcat.getServer().findServices()) {
Collections.addAll(connectors, service.findConnectors());
}
return connectors;
}
private void close(Connector connector) {
connector.pause();
connector.getProtocolHandler().closeServerSocketGraceful();
}
private boolean isActive(Container context) {
try {
if (((StandardContext) context).getInProgressAsyncCount() > 0) {
return true;
}
for (Container wrapper : context.findChildren()) {
if (((StandardWrapper) wrapper).getCountAllocated() > 0) {
return true;
}
}
return false;
}
catch (Exception ex) {
throw new RuntimeException(ex);
}
}
void abort() {
this.aborted = true;
}
}
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