SpringBoot利用actuator进行优雅关闭_简析

优雅关闭方式，即相关配置见：https://blog.csdn.net/XlxfyzsFdblj/article/details/82054744

简析：

配置management.endpoint.shutdown.enabled = true，
对应会调用ShutdownEndpoint的shutdown方法，

 public Map<String, String> shutdown() {
        if (this.context == null) {
            return NO_CONTEXT_MESSAGE;
        } else {
            boolean var6 = false;

            Map var1;
            try {
                var6 = true;
                var1 = SHUTDOWN_MESSAGE;
                var6 = false;
            } finally {
                if (var6) {
                    Thread thread = new Thread(this::performShutdown);
                    thread.setContextClassLoader(this.getClass().getClassLoader());
                    thread.start();
                }
            }

            Thread thread = new Thread(this::performShutdown);
            thread.setContextClassLoader(this.getClass().getClassLoader());
            thread.start();
            return var1;
        }
    }

    private void performShutdown() {
        try {
            Thread.sleep(500L);
        } catch (InterruptedException var2) {
            Thread.currentThread().interrupt();
        }

        this.context.close();//关闭
    }

就会新建一个线程，
去调用ConfigurableApplicationContext接口的关闭，
具体实现在AbstractApplicationContext的close方法，
他会调用自己的doClose方法，然后开始关闭Java进程，

public void close() {
        synchronized(this.startupShutdownMonitor) {
            this.doClose();
            if (this.shutdownHook != null) {
                try {
                    Runtime.getRuntime().removeShutdownHook(this.shutdownHook);
                } catch (IllegalStateException var4) {
                }
            }

        }
    }

    protected void doClose() {
        if (this.active.get() && this.closed.compareAndSet(false, true)) {
            if (this.logger.isDebugEnabled()) {
                this.logger.debug("Closing " + this);
            }

            LiveBeansView.unregisterApplicationContext(this);

            try {
                this.publishEvent((ApplicationEvent)(new ContextClosedEvent(this)));
            } catch (Throwable var3) {
                this.logger.warn("Exception thrown from ApplicationListener handling ContextClosedEvent", var3);
            }

            if (this.lifecycleProcessor != null) {
                try {
                    this.lifecycleProcessor.onClose();
                } catch (Throwable var2) {
                    this.logger.warn("Exception thrown from LifecycleProcessor on context close", var2);
                }
            }

            this.destroyBeans();
            this.closeBeanFactory();
            this.onClose();
            if (this.earlyApplicationListeners != null) {
                this.applicationListeners.clear();
                this.applicationListeners.addAll(this.earlyApplicationListeners);
            }

            this.active.set(false);
        }

    }

对应的运行日志：

closing

然后运行destroyBeans方法，调用销毁

然后注销掉一系列东西

unregister

最后把JMX(Java管理扩展)自己也关掉

整个优雅关闭的流程就完成了。

SpringBoot利用actuator进行优雅关闭_简析

浏览过的版块