设计一个代理程序,仅需要Spring容器管理部分bean并启动即可。该工程最终打成一个可执行Jar包，并构建成docker镜像后进行启动
public class Main {
public static void main(String[] args) throws InterruptedException {
ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("classpath*:services.xml");
applicationContext.start();
}
}
有一个bean开启线程执行业务任务
@Component
public class HelloLifeCycle implements Lifecycle {
private volatile boolean running = false;
private volatile boolean businessRunning = true;
private ExecutorService executors = Executors.newFixedThreadPool(1);
public HelloLifeCycle() {
executors.execute(() -> {
while (businessRunning) {
//启动后,做业务需要做的事情
}
});
}
public void start() {
logger.info("lifycycle start");
running = true;
}
public void stop() {
businessRunning=false;
logger.info("lifycycle stop ,and stop the execute");
executors.shutdown();
try {
executors.awaitTermination(1, TimeUnit.HOURS);
} catch (InterruptedException e) {
}
running = false;
}
public boolean isRunning() {
return running;
}
}
该业务类实现了Spring的LifeCycle钩子，Spring在调用其context的start()和stop（）方法时会回调业务类实现的start和stop方法
优雅关闭
如果就像上面的Main启动类，我们直接kill这个进程时，Spring是不会优雅关闭的，从而不会调用stop方法
public class Main {
public static void main(String[] args) throws InterruptedException {
ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("classpath*:services.xml");
applicationContext.registerShutdownHook();
applicationContext.start();
}
}
当注册了JVM钩子后，即可以实现优雅关闭