Spring中SmartLifecycle的用法解读

import org.springframework.context.SmartLifecycle;
import org.springframework.stereotype.Component;

@Component
public class TestSmartLifecycle implements SmartLifecycle {
    private boolean isRunning = false;
    
    @Override
    public void start() {
        System.out.println("start");
        // 执行完其他业务后，可以修改 isRunning = true
        isRunning = true;
    }
    
    @Override
    public int getPhase() {
        // 默认为0
        return 0;
    }
    
    @Override
    public boolean isAutoStartup() {
        // 默认为false
        return true;
    }
    
    @Override
    public boolean isRunning() {
        // 默认返回false
        return isRunning;
    }
    
    @Override
    public void stop(Runnable callback) {
        System.out.println("stop(Runnable)");
        // 如果你让isRunning返回true，需要执行stop这个方法，那么就不要忘记调用callback.run()。
        // 否则在你程序退出时，Spring的DefaultLifecycleProcessor会认为你这个TestSmartLifecycle没有stop完成，程序会一直卡着结束不了，等待一定时间（默认超时时间30秒）后才会自动结束。
        // PS：如果你想修改这个默认超时时间，可以按下面思路做，当然下面代码是springMVC配置文件形式的参考，在SpringBoot中自然不是配置xml来完成，这里只是提供一种思路。
        // <bean id="lifecycleProcessor" class="org.springframework.context.support.DefaultLifecycleProcessor">
        //      <!-- timeout value in milliseconds -->
        //      <property name="timeoutPerShutdownPhase" value="10000"/>
        // </bean>
        callback.run();
        isRunning = false;
    }
    
    @Override
    public void stop() {
        System.out.println("stop");
        isRunning = false;
    }
}

public interface SmartLifecycle extends Lifecycle, Phased {
 
	
	boolean isAutoStartup();
 
	
	void stop(Runnable callback); 
}

public class SmartLifecycleImpl implements SmartLifecycle {
    private Boolean isRunning = false;
    @Override
    public boolean isAutoStartup() {
        return true;
    }
 
    @Override
    public void stop(Runnable callback) {
        callback.run();
    }
 
    @Override
    public void start() {
        System.out.println("SmartLifecycleImpl is starting ....");
        isRunning = true;
    }
 
    @Override
    public void stop() {
        System.out.println("SmartLifecycleImpl is stopped.");
    }
    
    @Override
    public boolean isRunning() {
        return isRunning;
    }
 
    @Override
    public int getPhase() {
        return 0;
    }
}

public class ProviderBootstrap { 
    public static void main(String[] args) throws Exception {
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(ProviderConfiguration.class);
        context.start();
        System.in.read();
    } 
    @Configuration
    static class ProviderConfiguration { 
        @Bean
        public SmartLifecycleImpl getSmartLifecycleImpl(){
            return new SmartLifecycleImpl();
        }
    }
}