Spring : Lifecycle interface

Lifecycle interface is basically meant for managing startup and shutdown callbacks. For eg., on startup we would like to load data into the cache and on shutdown just clear the cache or start the process at startup and end it when exiting.

So SmartLifecycle is extension of Lifecycle Interface.

Example :

import org.springframework.context.SmartLifecycle;

public class LifecycleImpl implements SmartLifecycle {

    public LifecycleImpl() {
        System.out.println("LifecycleImpl class instantiated..");
    }
    
    @Override
    public boolean isAutoStartup() {
        System.out.println("isAutoStartup method our LifecyleImpl class called..");
        return true;
    }

    @Override
    public void stop(Runnable r) {
        System.out.println("stop(Runnable) method of our LifecycleImpl class called..");
        r.run();
    }

    @Override
    public boolean isRunning() {
        System.out.println("isRunning method of our LifecycleImpl class called..");
        return true;
    }

    @Override
    public void start() {
        System.out.println("start method of our LifecycleImpl class called..");
    }

    @Override
    public void stop() {
        System.out.println("stop method of our LifecycleImpl class called..");
    }

    @Override
    public int getPhase() {
        System.out.println("getPhase method of our LifecycleImpl class called..");
        return 1;
    }
}

Create the bean in simple way in context.xml.