Tuesday, December 21, 2004

Surviving Abrupt Shutdown

Nice article for doing tasks before the program exits. Surviving Abrupt Shutdown

Now I have the following lines of code in the constructor :

shutdownHook = new ShutdownHook();

and the new ShutdownHook class takes a snapshot of the Prevayler system.

* Created on Dec 22, 2004
* @author Bala Paranj
package com.zepho.mailer;

import com.zepho.persistence.UserDAO;

public class ShutdownHook extends Thread {
public void run() {
System.out.println("Taking Prevayler system snapshot before shut down...");
UserDAO userDAO = new UserDAO();
userDAO.backup();// TODO: backup must be taken only once every 24 hours.

Thus avoiding the reading of commands from multiple files during system startup. This speeds up the system startup.

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