Don't shutdown logging system before contexts
Add `SpringApplicationShutdownHook` to manage orderly application shutdown, specifically around the `LoggingSystem`. `SpringApplication` now offers a `getShutdownHandlers()` method that can be used to add handlers that are guaranteed to only run after the `ApplicationContext` has been closed and is inactive. Fixes gh-26660pull/26861/head
Andy Wilkinson
3 years ago
committed by
Phillip Webb
parent
39aa27e13c
commit
f3f119b111
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/*
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* Copyright 2012-2021 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.boot;
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import org.springframework.context.ApplicationContext;
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/**
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* Interface that can be used to add or remove code that should run when the JVM is
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* shutdown. Shutdown handers are similar to JVM {@link Runtime#addShutdownHook(Thread)
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* shutdown hooks} except that they run sequentially rather than concurrently.
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* <p>
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* Shutdown handlers are guaranteed to be called only after registered
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* {@link ApplicationContext} instances have been closed and are no longer active.
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*
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* @author Phillip Webb
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* @author Andy Wilkinson
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* @since 2.5.1
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* @see SpringApplication#getShutdownHandlers()
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* @see SpringApplication#setRegisterShutdownHook(boolean)
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*/
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public interface SpringApplicationShutdownHandlers {
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/**
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* Add an action to the handlers that will be run when the JVM exits.
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* @param action the action to add
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*/
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void add(Runnable action);
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/**
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* Remove a previously added an action so that it no longer runs when the JVM exits.
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* @param action the action to remove
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*/
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void remove(Runnable action);
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}
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@ -0,0 +1,205 @@
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/*
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* Copyright 2012-2021 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.boot;
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import java.security.AccessControlException;
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import java.util.Collections;
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import java.util.IdentityHashMap;
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import java.util.LinkedHashSet;
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import java.util.Set;
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import java.util.WeakHashMap;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.TimeoutException;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.springframework.context.ApplicationContext;
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import org.springframework.context.ApplicationListener;
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import org.springframework.context.ConfigurableApplicationContext;
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import org.springframework.context.event.ContextClosedEvent;
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import org.springframework.util.Assert;
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/**
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* A {@link Runnable} to be used as a {@link Runtime#addShutdownHook(Thread) shutdown
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* hook} to perform graceful shutdown of Spring Boot applications. This hook tracks
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* registered application contexts as well as any actions registered via
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* {@link SpringApplication#getShutdownHandlers()}.
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*
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* @author Andy Wilkinson
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* @author Phillip Webb
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*/
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class SpringApplicationShutdownHook implements Runnable {
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private static final int SLEEP = 50;
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private static final long TIMEOUT = TimeUnit.MINUTES.toMillis(10);
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private static final Log logger = LogFactory.getLog(SpringApplicationShutdownHook.class);
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private final Handlers handlers = new Handlers();
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private final Set<ConfigurableApplicationContext> contexts = new LinkedHashSet<>();
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private final Set<ConfigurableApplicationContext> closedContexts = Collections.newSetFromMap(new WeakHashMap<>());
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private final ApplicationContextClosedListener contextCloseListener = new ApplicationContextClosedListener();
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private boolean inProgress;
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SpringApplicationShutdownHook() {
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try {
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addRuntimeShutdownHook();
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}
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catch (AccessControlException ex) {
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// Not allowed in some environments
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}
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}
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protected void addRuntimeShutdownHook() {
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Runtime.getRuntime().addShutdownHook(new Thread(this, "SpringApplicationShutdownHook"));
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}
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SpringApplicationShutdownHandlers getHandlers() {
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return this.handlers;
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}
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void registerApplicationContext(ConfigurableApplicationContext context) {
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synchronized (SpringApplicationShutdownHook.class) {
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assertNotInProgress();
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context.addApplicationListener(this.contextCloseListener);
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this.contexts.add(context);
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}
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}
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@Override
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public void run() {
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Set<ConfigurableApplicationContext> contexts;
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Set<ConfigurableApplicationContext> closedContexts;
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Set<Runnable> actions;
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synchronized (SpringApplicationShutdownHook.class) {
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this.inProgress = true;
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contexts = new LinkedHashSet<>(this.contexts);
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closedContexts = new LinkedHashSet<>(this.closedContexts);
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actions = new LinkedHashSet<>(this.handlers.getActions());
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}
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contexts.forEach(this::closeAndWait);
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closedContexts.forEach(this::closeAndWait);
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actions.forEach(Runnable::run);
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}
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boolean isApplicationContextRegistered(ConfigurableApplicationContext context) {
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synchronized (SpringApplicationShutdownHook.class) {
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return this.contexts.contains(context);
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}
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}
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void reset() {
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synchronized (SpringApplicationShutdownHook.class) {
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this.contexts.clear();
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this.closedContexts.clear();
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this.handlers.getActions().clear();
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this.inProgress = false;
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}
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}
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/**
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* Call {@link ConfigurableApplicationContext#close()} and wait until the context
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* becomes inactive. We can't assume that just because the close method returns that
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* the context is actually inactive. It could be that another thread is still in the
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* process of disposing beans.
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* @param context the context to clean
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*/
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private void closeAndWait(ConfigurableApplicationContext context) {
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context.close();
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try {
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int waited = 0;
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while (context.isActive()) {
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if (waited > TIMEOUT) {
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throw new TimeoutException();
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}
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Thread.sleep(SLEEP);
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waited += SLEEP;
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}
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}
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catch (InterruptedException ex) {
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Thread.currentThread().interrupt();
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logger.warn("Interrupted waiting for application context " + context + " to become inactive");
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}
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catch (TimeoutException ex) {
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logger.warn("Timed out waiting for application context " + context + " to become inactive", ex);
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}
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}
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private void assertNotInProgress() {
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Assert.state(!SpringApplicationShutdownHook.this.inProgress, "Shutdown in progress");
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}
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/**
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* The handler actions for this shutdown hook.
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*/
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private class Handlers implements SpringApplicationShutdownHandlers {
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private final Set<Runnable> actions = Collections.newSetFromMap(new IdentityHashMap<>());
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@Override
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public void add(Runnable action) {
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Assert.notNull(action, "Action must not be null");
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synchronized (SpringApplicationShutdownHook.class) {
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assertNotInProgress();
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this.actions.add(action);
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}
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}
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@Override
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public void remove(Runnable action) {
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Assert.notNull(action, "Action must not be null");
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synchronized (SpringApplicationShutdownHook.class) {
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assertNotInProgress();
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this.actions.remove(action);
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}
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}
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Set<Runnable> getActions() {
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return this.actions;
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}
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}
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/**
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* {@link ApplicationListener} to track closed contexts.
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*/
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private class ApplicationContextClosedListener implements ApplicationListener<ContextClosedEvent> {
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@Override
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public void onApplicationEvent(ContextClosedEvent event) {
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// The ContextClosedEvent is fired at the start of a call to {@code close()}
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// and if that happens in a different thread then the context may still be
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// active. Rather than just removing the context, we add it to a {@code
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// closedContexts} set. This is weak set so that the context can be GC'd once
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// the {@code close()} method returns.
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synchronized (SpringApplicationShutdownHook.class) {
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ApplicationContext applicationContext = event.getApplicationContext();
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SpringApplicationShutdownHook.this.contexts.remove(applicationContext);
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SpringApplicationShutdownHook.this.closedContexts
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.add((ConfigurableApplicationContext) applicationContext);
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}
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}
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}
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}
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@ -0,0 +1,85 @@
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/*
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* Copyright 2012-2021 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.boot;
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import org.assertj.core.api.AbstractBooleanAssert;
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import org.assertj.core.api.AssertProvider;
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import org.assertj.core.api.Assertions;
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import org.assertj.core.api.ObjectAssert;
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import org.springframework.boot.SpringApplicationShutdownHookInstance.Assert;
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import org.springframework.context.ConfigurableApplicationContext;
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/**
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* Test access to the static {@link SpringApplicationShutdownHook} instance in
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* {@link SpringApplication}.
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*
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* @author Phillip Webb
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*/
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public final class SpringApplicationShutdownHookInstance implements AssertProvider<Assert> {
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private final SpringApplicationShutdownHook shutdownHook;
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private SpringApplicationShutdownHookInstance(SpringApplicationShutdownHook shutdownHook) {
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this.shutdownHook = shutdownHook;
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}
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SpringApplicationShutdownHook getShutdownHook() {
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return this.shutdownHook;
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}
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@Override
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public Assert assertThat() {
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return new Assert(this.shutdownHook);
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}
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public static void reset() {
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get().getShutdownHook().reset();
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}
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public static SpringApplicationShutdownHookInstance get() {
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return new SpringApplicationShutdownHookInstance(SpringApplication.shutdownHook);
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}
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/**
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* Assertions that can be performed on the {@link SpringApplicationShutdownHook}.
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*/
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public static class Assert extends ObjectAssert<SpringApplicationShutdownHook> {
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Assert(SpringApplicationShutdownHook actual) {
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super(actual);
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}
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public Assert registeredApplicationContext(ConfigurableApplicationContext context) {
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assertThatIsApplicationContextRegistered(context).isTrue();
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return this;
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}
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public Assert didNotRegisterApplicationContext(ConfigurableApplicationContext context) {
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assertThatIsApplicationContextRegistered(context).isFalse();
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return this;
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}
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private AbstractBooleanAssert<?> assertThatIsApplicationContextRegistered(
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ConfigurableApplicationContext context) {
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return Assertions.assertThat(this.actual.isApplicationContextRegistered(context))
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.as("ApplicationContext registered with shutdown hook");
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}
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}
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}
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@ -0,0 +1,224 @@
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/*
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* Copyright 2012-2021 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.boot;
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import java.lang.Thread.State;
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import java.time.Duration;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.concurrent.CopyOnWriteArrayList;
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import java.util.concurrent.CountDownLatch;
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import org.awaitility.Awaitility;
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import org.junit.jupiter.api.Test;
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import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
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import org.springframework.beans.factory.support.DefaultListableBeanFactory;
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import org.springframework.context.ConfigurableApplicationContext;
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import org.springframework.context.support.AbstractApplicationContext;
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import static org.assertj.core.api.Assertions.assertThat;
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import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException;
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import static org.assertj.core.api.Assertions.assertThatIllegalStateException;
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/**
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* Tests for {@link SpringApplicationShutdownHook}.
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*
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* @author Phillip Webb
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* @author Andy Wilkinson
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*/
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class SpringApplicationShutdownHookTests {
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@Test
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void createCallsRegister() {
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TestSpringApplicationShutdownHook shutdownHook = new TestSpringApplicationShutdownHook();
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assertThat(shutdownHook.isRuntimeShutdownHookAdded()).isTrue();
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}
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@Test
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void runClosesContextsBeforeRunningHandlerActions() {
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TestSpringApplicationShutdownHook shutdownHook = new TestSpringApplicationShutdownHook();
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List<Object> finished = new CopyOnWriteArrayList<>();
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ConfigurableApplicationContext context = new TestApplicationContext(finished);
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shutdownHook.registerApplicationContext(context);
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context.refresh();
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Runnable handlerAction = new TestHandlerAction(finished);
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shutdownHook.getHandlers().add(handlerAction);
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shutdownHook.run();
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assertThat(finished).containsExactly(context, handlerAction);
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}
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@Test
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void runWhenContextIsBeingClosedInAnotherThreadWaitsUntilContextIsInactive() throws InterruptedException {
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// This situation occurs in the Spring Tools IDE. It triggers a context close via
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// JMX and then stops the JVM. The two actions happen almost simultaneously
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TestSpringApplicationShutdownHook shutdownHook = new TestSpringApplicationShutdownHook();
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List<Object> finished = new CopyOnWriteArrayList<>();
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CountDownLatch closing = new CountDownLatch(1);
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CountDownLatch proceedWithClose = new CountDownLatch(1);
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ConfigurableApplicationContext context = new TestApplicationContext(finished, closing, proceedWithClose);
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shutdownHook.registerApplicationContext(context);
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context.refresh();
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Runnable handlerAction = new TestHandlerAction(finished);
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shutdownHook.getHandlers().add(handlerAction);
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Thread contextThread = new Thread(context::close);
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contextThread.start();
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// Wait for context thread to begin closing the context
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closing.await();
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Thread shutdownThread = new Thread(shutdownHook);
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shutdownThread.start();
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// Shutdown thread should become blocked on monitor held by context thread
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Awaitility.await().atMost(Duration.ofSeconds(30)).until(shutdownThread::getState, State.BLOCKED::equals);
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// Allow context thread to proceed, unblocking shutdown thread
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proceedWithClose.countDown();
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contextThread.join();
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shutdownThread.join();
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// Context should have been closed before handler action was run
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assertThat(finished).containsExactly(context, handlerAction);
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}
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@Test
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void runWhenContextIsClosedDirectlyRunsHandlerActions() {
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TestSpringApplicationShutdownHook shutdownHook = new TestSpringApplicationShutdownHook();
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List<Object> finished = new CopyOnWriteArrayList<>();
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ConfigurableApplicationContext context = new TestApplicationContext(finished);
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shutdownHook.registerApplicationContext(context);
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context.refresh();
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context.close();
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Runnable handlerAction1 = new TestHandlerAction(finished);
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Runnable handlerAction2 = new TestHandlerAction(finished);
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shutdownHook.getHandlers().add(handlerAction1);
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shutdownHook.getHandlers().add(handlerAction2);
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shutdownHook.run();
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assertThat(finished).contains(handlerAction1, handlerAction2);
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}
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@Test
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void addHandlerActionWhenNullThrowsException() {
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TestSpringApplicationShutdownHook shutdownHook = new TestSpringApplicationShutdownHook();
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assertThatIllegalArgumentException().isThrownBy(() -> shutdownHook.getHandlers().add(null))
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.withMessage("Action must not be null");
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}
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@Test
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void addHandlerActionWhenShuttingDownThrowsException() {
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TestSpringApplicationShutdownHook shutdownHook = new TestSpringApplicationShutdownHook();
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shutdownHook.run();
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Runnable handlerAction = new TestHandlerAction(new ArrayList<>());
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assertThatIllegalStateException().isThrownBy(() -> shutdownHook.getHandlers().add(handlerAction))
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.withMessage("Shutdown in progress");
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}
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@Test
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void removeHandlerActionWhenNullThrowsException() {
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TestSpringApplicationShutdownHook shutdownHook = new TestSpringApplicationShutdownHook();
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assertThatIllegalArgumentException().isThrownBy(() -> shutdownHook.getHandlers().remove(null))
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.withMessage("Action must not be null");
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}
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@Test
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void removeHandlerActionWhenShuttingDownThrowsException() {
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TestSpringApplicationShutdownHook shutdownHook = new TestSpringApplicationShutdownHook();
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Runnable handlerAction = new TestHandlerAction(new ArrayList<>());
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shutdownHook.getHandlers().add(handlerAction);
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shutdownHook.run();
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assertThatIllegalStateException().isThrownBy(() -> shutdownHook.getHandlers().remove(handlerAction))
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.withMessage("Shutdown in progress");
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}
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static class TestSpringApplicationShutdownHook extends SpringApplicationShutdownHook {
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private boolean runtimeShutdownHookAdded;
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@Override
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protected void addRuntimeShutdownHook() {
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this.runtimeShutdownHookAdded = true;
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}
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|
||||
boolean isRuntimeShutdownHookAdded() {
|
||||
return this.runtimeShutdownHookAdded;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
static class TestApplicationContext extends AbstractApplicationContext {
|
||||
|
||||
private final ConfigurableListableBeanFactory beanFactory = new DefaultListableBeanFactory();
|
||||
|
||||
private final List<Object> finished;
|
||||
|
||||
private final CountDownLatch closing;
|
||||
|
||||
private final CountDownLatch proceedWithClose;
|
||||
|
||||
TestApplicationContext(List<Object> finished) {
|
||||
this(finished, null, null);
|
||||
}
|
||||
|
||||
TestApplicationContext(List<Object> finished, CountDownLatch closing, CountDownLatch proceedWithClose) {
|
||||
this.finished = finished;
|
||||
this.closing = closing;
|
||||
this.proceedWithClose = proceedWithClose;
|
||||
}
|
||||
|
||||
@Override
|
||||
protected void refreshBeanFactory() {
|
||||
}
|
||||
|
||||
@Override
|
||||
protected void closeBeanFactory() {
|
||||
}
|
||||
|
||||
@Override
|
||||
protected void onClose() {
|
||||
if (this.closing != null) {
|
||||
this.closing.countDown();
|
||||
}
|
||||
if (this.proceedWithClose != null) {
|
||||
try {
|
||||
this.proceedWithClose.await();
|
||||
}
|
||||
catch (InterruptedException ex) {
|
||||
Thread.currentThread().interrupt();
|
||||
}
|
||||
}
|
||||
this.finished.add(this);
|
||||
}
|
||||
|
||||
@Override
|
||||
public ConfigurableListableBeanFactory getBeanFactory() {
|
||||
return this.beanFactory;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
static class TestHandlerAction implements Runnable {
|
||||
|
||||
private final List<Object> finished;
|
||||
|
||||
TestHandlerAction(List<Object> finished) {
|
||||
this.finished = finished;
|
||||
}
|
||||
|
||||
@Override
|
||||
public void run() {
|
||||
this.finished.add(this);
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
Loading…
Reference in New Issue