package org.litesoft.GWT.client.command.queue;

import com.google.gwt.user.client.*;

public interface CommandQueueListener extends java.util.EventListener
{
    boolean beforeCommandAdded( CommandQueueBase pQueue, Command pCommand );

    void afterCommandAdded( CommandQueueBase pQueue, Command pCommand );

    /**
     * Called immediately before a pCommand is be executed
     *
     * @param pQueue   the pQueue executing the pCommand
     * @param pCommand the pCommand to be executed
     *
     * @return <code>false</code> to cancel executing the pCommand
     */
    boolean beforeCommandExecuted( CommandQueueBase pQueue, Command pCommand );

    /**
     * Called immediately after a pCommand is executed
     *
     * @param pQueue   the pQueue executing the pCommand
     * @param pCommand the pCommand which was executed
     */
    void afterCommandExecuted( CommandQueueBase pQueue, Command pCommand );
}