BE THE CODER > Spring > Core Examples

Spring Inversion of Control (IoC) also known as Dependency Injection (DI) is a process by which objects define their dependencies with collaborating objects. Spring provides a better alternative to using DisposableBean interface. The attribute destroy-method allows us to specify a no-argument method as a destruction callback method.

File Name :

/SpringCore001/conf/callback/destroy2.xml

File Name :

com/bethecoder/tutorials/spring3/basic/SimpleDisposableBean2.java


package com.bethecoder.tutorials.spring3.basic;



public class SimpleDisposableBean2 {



  private String simpleProp;



  public String getSimpleProp() {

    return simpleProp;

  }



  public void setSimpleProp(String simpleProp) {

    this.simpleProp = simpleProp;

  }



  public void dispose() {



    System.out.println("In custom destroy callback : " + simpleProp);

    

    simpleProp = null; 

      

    System.out.println("In custom destroy callback : " + simpleProp);

  }

  

  public String toString() {

    return "SimpleDisposableBean2[" + simpleProp + "]";

  }

}

File Name :	com/bethecoder/tutorials/spring3/tests/callbacks/DestructionCallback2.java
Author :	Sudhakar KV
Email :	[email protected]


package com.bethecoder.tutorials.spring3.tests.callbacks;



import org.springframework.context.ApplicationContext;

import org.springframework.context.support.AbstractApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;



import com.bethecoder.tutorials.spring3.basic.SimpleDisposableBean2;



public class DestructionCallback2 {



  /**

   * @param args

   */

  public static void main(String[] args) {

    

    System.out.println("Initializing ApplicationContext");

    ApplicationContext factory = new ClassPathXmlApplicationContext("destroy2.xml");

    System.out.println("ApplicationContext Initialized");

    

    System.out.println("Accessing first bean");

    SimpleDisposableBean2 first = (SimpleDisposableBean2) factory.getBean("first");

    System.out.println(first);



    System.out.println("Accessing second bean");

    SimpleDisposableBean2 second = (SimpleDisposableBean2) factory.getBean("second");

    System.out.println(second);

    

    /**

     * Register a Shutdown hook for graceful Shutdown.

     * Calls the relevant destroy methods on your singleton beans 

     * so that all resources are released

     */

    AbstractApplicationContext abc = (AbstractApplicationContext ) factory;

    abc.registerShutdownHook();

  

  }



}

Destruction Callback