[Opensource] How can i create Listener Objects for DBObject?

[fjm]

Hello, Gaspar Gonzalez Oliva,

    We found the same problem, and  have added following code into DBObject.java:

    //=============== begin ====	
	private static Vector listeners = null;

	public void deleteNotify(String keyFieldValue, ErrorCollection ee)
	    throws DBException {

		DBListener oneListener = null;

		if (listeners != null) {
			Vector theListeners = null;
			synchronized(listeners) {
				theListeners = (Vector)listeners.clone();
			}

			for (Enumeration e = theListeners.elements(); e.hasMoreElements();) {
				oneListener = (DBListener)e.nextElement();
				oneListener.deletedAction(this.getName(),keyFieldValue,ee);
			}
		}
	}

	public void addNotify(String keyFieldValue, ErrorCollection ee) throws DBException {

			DBListener oneListener = null;

			if (listeners != null) {
				Vector theListeners = null;
				synchronized(listeners) {
					theListeners = (Vector)listeners.clone();
				}

				for (Enumeration e = theListeners.elements(); e.hasMoreElements();) {
					oneListener = (DBListener)e.nextElement();
					oneListener.addedAction(this.getName(),keyFieldValue,ee);
				}
			}
	}

	public void codeUpgradeNotify(String keyFieldValue, ErrorCollection ee) throws DBException {

			DBListener oneListener = null;

			if (listeners != null) {
				Vector theListeners = null;
				synchronized(listeners) {
					theListeners = (Vector)listeners.clone();
				}

				for (Enumeration e = theListeners.elements(); e.hasMoreElements();) {
					oneListener = (DBListener)e.nextElement();
					oneListener.codeUpgradedAction(this.getName(),keyFieldValue,ee);
				}
			}
	}

	/**
	 * Adds a DBListener object to list of listeners
	 *
	 * @param listener DBListener The object that wants to listen in on DBObject add/delete
	 */
	public static synchronized void addListener(DBListener listener) { 

			if (listeners == null) {
				listeners = new Vector(4);
			}

			listeners.add(listener);
	}
    //=============== end ====	

and DBListener.java:

-------------------------------------------------------------------------------
package com.jsite.expresso.misc;

import com.jcorporate.expresso.core.controller.ErrorCollection;
import com.jcorporate.expresso.core.db.DBException;

public interface DBListener {

	public void deletedAction(String dbobjName, String keyFieldValue, ErrorCollection ee)
	       throws DBException;
	
	public void addedAction(String dbobjName, String keyFieldValue, ErrorCollection ee)
	       throws DBException;
} 
------------------------------------------------------------------------------- 	

>Hi,
>
>I see that Expresso 5.0.4 have a DBObject method called <addCacheEventListener>,  but is
>marked deprecated, that let us register another object to "listening"
>(updates/adds/deletes) to this DBObject.  This method is deprecated, my question is:
>
>1-What another option i have to do this, "listening"?. is the <notifyListeners>
>method, the solution?.
>2-Since what version of Expresso it is deprecated?
>
>Gaspar
>
>
>
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¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡fjm
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡fzxfjl at public.cz.js.cn
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡2003-07-10