/*******************************************************************************
* CogTool Copyright Notice and Distribution Terms
* CogTool 1.3, Copyright (c) 2005-2013 Carnegie Mellon University
* This software is distributed under the terms of the FSF Lesser
* Gnu Public License (see LGPL.txt).
*
* CogTool is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* CogTool is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with CogTool; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* CogTool makes use of several third-party components, with the
* following notices:
*
* Eclipse SWT version 3.448
* Eclipse GEF Draw2D version 3.2.1
*
* Unless otherwise indicated, all Content made available by the Eclipse
* Foundation is provided to you under the terms and conditions of the Eclipse
* Public License Version 1.0 ("EPL"). A copy of the EPL is provided with this
* Content and is also available at http://www.eclipse.org/legal/epl-v10.html.
*
* CLISP version 2.38
*
* Copyright (c) Sam Steingold, Bruno Haible 2001-2006
* This software is distributed under the terms of the FSF Gnu Public License.
* See COPYRIGHT file in clisp installation folder for more information.
*
* ACT-R 6.0
*
* Copyright (c) 1998-2007 Dan Bothell, Mike Byrne, Christian Lebiere &
* John R Anderson.
* This software is distributed under the terms of the FSF Lesser
* Gnu Public License (see LGPL.txt).
*
* Apache Jakarta Commons-Lang 2.1
*
* This product contains software developed by the Apache Software Foundation
* (http://www.apache.org/)
*
* jopt-simple version 1.0
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* Copyright (c) 2004-2013 Paul R. Holser, Jr.
*
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* a copy of this software and associated documentation files (the
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* Mozilla XULRunner 1.9.0.5
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/.
* Software distributed under the License is distributed on an "AS IS"
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* The J2SE(TM) Java Runtime Environment version 5.0
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******************************************************************************/
package edu.cmu.cs.hcii.cogtool.util;
/**
* Abstract implementation for scheduling the progress callback feedback
* to be run by SWT "at the next reasonable opportunity" (see
* <code>org.eclipse.swt.widgets.Display</code>).
*/
public abstract class AProgressCallback implements ProgressCallback, Runnable
{
/**
* Caches the progress percentage provided by <code>updateProgress</code>
*/
protected double progress = 0.0;
/**
* Caches the status provided by <code>updateProgress</code>
*/
protected String status = "";
/**
* Each subclass must override <code>progressCallback</code>
* to handle the periodic informing of progress by another
* computation. Executed on main UI thread.
*
* @param progressPct a number from 0.0 to 1.0 (inclusive) indicating
* the percentage progress from 0% to 100%
* @param progressStatus an arbitrary string that may be interpreted and/or
* displayed by the progress callback object
*/
protected abstract void progressCallback(double progressPct,
String progressStatus);
/**
* Use the given progress (a number between 0.0 and 1.0 inclusive,
* reflecting a percentage between 0% and 100%) and status
* (which may be interpreted or displayed to the user) to react
* to progress by a computation.
* <p>
* The notification presumably came from another thread, so
* the reaction must be scheduled to execute on the main user interface
* thread; thus, we schedule the invocation of the
* <code>progressCallback</code> as overridden by the subclass.
*
* @param progressSoFar a number from 0.0 to 1.0 (inclusive) indicating
* the percentage progress from 0% to 100%
* @param statusAsOfProgress an arbitrary string that may be interpreted
* and/or displayed
*/
public void updateProgress(double progressSoFar, String statusAsOfProgress)
{
// Executes in the child thread
synchronized(this) {
progress = progressSoFar;
status = statusAsOfProgress;
}
WindowUtil.scheduleAsynchronously(this);
}
/**
* Perform any cleanup necessary to recover system resources.
*/
public void dispose()
{
// Nothing to do by default
}
/**
* To schedule a method to be run by SWT "at the next reasonable
* opportunity", this object must be a <code>Runnable</code>, since
* its <code>run</code> method will be invoked when scheduled.
* <p>
* The purpose of this is to execute in the main UI thread the reaction to
* the notification of a change in progress.
*/
public void run()
{
// Executes in the main UI thread
double localProgress;
String localStatus;
synchronized(this) {
localProgress = progress;
localStatus = status;
}
progressCallback(localProgress, localStatus);
}
}