Question

我试图理解Lifecycle接口逻辑。 Lifecycle的文档说：

容器会将启动/停止信号传播到所有组件适用于每个容器，例如用于停止/重启场景运行时。

但似乎cantainer根本没有调用这种方法（开始/停止）。

例如，下一个代码段的结果只是单个输出＆＃34;＆gt;＆gt; call：正在运行：false＆＃34;

@Configuration
public class TestApp implements Lifecycle {

    boolean runStatus = false;

    @Override
    public void start() {
        System.err.println(">> call: start (Lifecycle)");
        runStatus = true;
    }

    @Override
    public void stop() {
        System.err.println(">> call: stop (Lifecycle)");
        runStatus = false;
    }

    @Override
    public boolean isRunning() {
        System.err.println(">> call: is running: " + runStatus);
        return runStatus;
    }

    public static void main(String[] args) {
        AbstractApplicationContext ctx = new AnnotationConfigApplicationContext(TestApp.class);
        ctx.stop();
    }
}

P.S。我听说过SmartLifecycle，它运行正常。但我对如何正确使用Lifecycle中的启动/停止方法感兴趣。

Answer 1

您应该手动start()和stop()上下文。

@Configuration
 public class TestApp implements Lifecycle {

  boolean runStatus = false;

  public TestApp (){}


  @Bean
  public TestApp testApp(){
    return new TestApp();
  }

  @Override
  public void start() {
    System.err.println(">> call: start (Lifecycle)");
    runStatus = true;
  }

  @Override
  public void stop() {
    System.err.println(">> call: stop (Lifecycle)");
    runStatus = false;
  }

  @Override
  public boolean isRunning() {
    System.err.println(">> call: is running: " + runStatus);
    return runStatus;
  }

  public static void main(String[] args) {
    AbstractApplicationContext ctx = new AnnotationConfigApplicationContext(TestApp.class);
    ctx.start();
    TestApp ta = ctx.getBean(TestApp.class);
    ctx.stop();
  }
}

Spring在什么条件下调用Lifecycle的启动/停止挂钩？

1 个答案: