spring boot 2.0 实现优雅停机

前期踩的坑 (spring boot 1.x)

1. 添加mavne依赖

1<!-- springboot监控 -->  
2<dependency>  
3    <groupId>org.springframework.boot</groupId>  
4    <artifactId>spring-boot-starter-actuator</artifactId>  
5</dependency>  

2. 启用shutdown

在配置文件里添加下面的配置

1#启用shutdown endpoint的HTTP访问
2endpoints.shutdown.enabled=true
3#不需要验证 
4endpoints.shutdown.sensitive=false

启动的时候可以看到下面的日志，就说明成功了

3. 优雅停机

发送POST请求 http://localhost:8080/shutdown
如果响应码是404 可以尝试POST http://localhost:8080/actuator/shutdown

spring boot 2.0

如果你使用的spring boot版本是2.x的就会发现，这些POST请求都会出现404的结果。

下面是spring boot 2.0 优雅停机的实现方式。

1.修改Application启动类

tomcat容器

1@SpringBootApplication
2public class ShutdownApplication {
3
4    public static void main(String[] args) {
5        SpringApplication.run(ShutdownApplication.class, args);
6    }
7
8    /**
9     * 用于接受 shutdown 事件
10     */
11    @Bean
12    public GracefulShutdown gracefulShutdown() {
13        return new GracefulShutdown();
14    }
15
16    /**
17     * 配置tomcat
18     *
19     * @return
20     */
21    @Bean
22    public ServletWebServerFactory servletContainer() {
23        TomcatServletWebServerFactory tomcat = new TomcatServletWebServerFactory();
24        tomcat.addConnectorCustomizers(gracefulShutdown());
25        return tomcat;
26    }
27
28    /**
29     * 优雅关闭 Spring Boot。容器必须是 tomcat
30     */
31    private class GracefulShutdown implements TomcatConnectorCustomizer, ApplicationListener<ContextClosedEvent> {
32        private final Logger log = LoggerFactory.getLogger(GracefulShutdown.class);
33        private volatile Connector connector;
34        private final int waitTime = 10;
35
36        @Override
37        public void customize(Connector connector) {
38            this.connector = connector;
39        }
40
41        @Override
42        public void onApplicationEvent(ContextClosedEvent contextClosedEvent) {
43            this.connector.pause();
44            Executor executor = this.connector.getProtocolHandler().getExecutor();
45            if (executor instanceof ThreadPoolExecutor) {
46                try {
47                    ThreadPoolExecutor threadPoolExecutor = (ThreadPoolExecutor) executor;
48                    threadPoolExecutor.shutdown();
49                    if (!threadPoolExecutor.awaitTermination(waitTime, TimeUnit.SECONDS)) {
50                        log.warn("Tomcat 进程在" + waitTime + " 秒内无法结束，尝试强制结束");
51                    }
52                } catch (InterruptedException ex) {
53                    Thread.currentThread().interrupt();
54                }
55            }
56        }
57    }
58}
59

Undertow容器 (没有使用过，不保证可用)

1@SpringBootApplication
2public class Application {
3
4    public static void main(String[] args) {
5        SpringApplication.run(Application.class, args);
6    }
7
8    /**
9     * 优雅关闭 Spring Boot
10     */
11    @Component
12    public class GracefulShutdown implements ApplicationListener<ContextClosedEvent> {
13
14        @Autowired
15        private GracefulShutdownWrapper gracefulShutdownWrapper;
16
17        @Autowired
18        private ServletWebServerApplicationContext context;
19
20        @Override
21        public void onApplicationEvent(ContextClosedEvent contextClosedEvent){
22            gracefulShutdownWrapper.getGracefulShutdownHandler().shutdown();
23            try {
24                UndertowServletWebServer webServer = (UndertowServletWebServer)context.getWebServer();
25                Field field = webServer.getClass().getDeclaredField("undertow");
26                field.setAccessible(true);
27                Undertow undertow = (Undertow) field.get(webServer);
28                List<Undertow.ListenerInfo> listenerInfo = undertow.getListenerInfo();
29                Undertow.ListenerInfo listener = listenerInfo.get(0);
30                ConnectorStatistics connectorStatistics = listener.getConnectorStatistics();
31                while (connectorStatistics.getActiveConnections() > 0){}
32            }catch (Exception e){
33                // Application Shutdown
34            }
35        }
36    }
37    @Component
38    public class GracefulShutdownWrapper implements HandlerWrapper{
39
40        private GracefulShutdownHandler gracefulShutdownHandler;
41
42        @Override
43        public HttpHandler wrap(HttpHandler handler) {
44            if(gracefulShutdownHandler == null) {
45                this.gracefulShutdownHandler = new GracefulShutdownHandler(handler);
46            }
47            return gracefulShutdownHandler;
48        }
49
50        public GracefulShutdownHandler getGracefulShutdownHandler() {
51            return gracefulShutdownHandler;
52        }
53
54    }
55    @Component
56    @AllArgsConstructor
57    public class UndertowExtraConfiguration {
58
59        private final GracefulShutdownWrapper gracefulShutdownWrapper;
60
61        @Bean
62        public UndertowServletWebServerFactory servletWebServerFactory() {
63            UndertowServletWebServerFactory factory = new UndertowServletWebServerFactory();
64            factory.addDeploymentInfoCustomizers(deploymentInfo -> deploymentInfo.addOuterHandlerChainWrapper(gracefulShutdownWrapper));
65            factory.addBuilderCustomizers(builder -> builder.setServerOption(UndertowOptions.ENABLE_STATISTICS, true));
66            return factory;
67        }
68
69    }
70}

2. 使用 kill命令杀死进程

使用下面的命令杀死进程。该命令是向 某个进程发送终止信号。

1kill -15 [PID]

参考链接

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