/*
|
* CDDL HEADER START
|
*
|
* The contents of this file are subject to the terms of the
|
* Common Development and Distribution License, Version 1.0 only
|
* (the "License"). You may not use this file except in compliance
|
* with the License.
|
*
|
* You can obtain a copy of the license at
|
* trunk/opends/resource/legal-notices/OpenDS.LICENSE
|
* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
|
* See the License for the specific language governing permissions
|
* and limitations under the License.
|
*
|
* When distributing Covered Code, include this CDDL HEADER in each
|
* file and include the License file at
|
* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
|
* add the following below this CDDL HEADER, with the fields enclosed
|
* by brackets "[]" replaced with your own identifying * information:
|
* Portions Copyright [yyyy] [name of copyright owner]
|
*
|
* CDDL HEADER END
|
*
|
*
|
* Portions Copyright 2006 Sun Microsystems, Inc.
|
*/
|
package org.opends.quicksetup.util;
|
|
|
|
/**
|
* This class provides a mechanism for running a task in the background using a
|
* separate thread and providing the caller with notification when it has
|
* completed.
|
*/
|
public abstract class BackgroundTask
|
{
|
/**
|
* Creates a new thread and begins running the task in the background. When
|
* the task has completed, the {@code backgroundTaskCompleted} method will be
|
* invoked.
|
*/
|
public final void startBackgroundTask()
|
{
|
BackgroundTaskThread taskThread = new BackgroundTaskThread(this);
|
taskThread.start();
|
}
|
|
|
|
/**
|
* Performs all processing associated with the task.
|
*
|
* @return An {@code Object} with information about the processing performed
|
* for this task, or {@code null} if no return value is needed.
|
*
|
* @throws Exception exception that will be passed through the method
|
* backgroundTaskCompleted.
|
*/
|
public abstract Object processBackgroundTask() throws Exception;
|
|
|
|
/**
|
* This method will be invoked to indicate that the background task has
|
* completed. If processing completed successfully, then the
|
* {@code Throwable} argument will be {@code null} and the {@code returnValue}
|
* argument will contain the value returned by the
|
* {@code processBackgroundTask} method. If an exception or error was thrown,
|
* then the {@code throwable} argument will not be {@code null}.
|
*
|
* @param returnValue The value returned by the
|
* {@code processBackgroundTask} method when processing
|
* completed, or {@code null} if no value was returned or
|
* an exception was encountered during processing.
|
* @param throwable A {@code Throwable} instance (e.g., an exception) that
|
* was raised during processing, or {@code null} if all
|
* processing completed successfully.
|
*/
|
public abstract void backgroundTaskCompleted(Object returnValue,
|
Throwable throwable);
|
}
|
