/*
* This file is part of the Echo Web Application Framework (hereinafter "Echo").
* Copyright (C) 2002-2009 NextApp, Inc.
*
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* 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" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*/
package nextapp.echo2.testapp.interactive.testscreen;
import nextapp.echo2.app.ApplicationInstance;
import nextapp.echo2.app.Button;
import nextapp.echo2.app.Extent;
import nextapp.echo2.app.Insets;
import nextapp.echo2.app.Label;
import nextapp.echo2.app.TaskQueueHandle;
import nextapp.echo2.app.Column;
import nextapp.echo2.app.event.ActionEvent;
import nextapp.echo2.app.event.ActionListener;
import nextapp.echo2.app.layout.SplitPaneLayoutData;
/**
* Test for asynchronous (server push) operations.
*/
public class PushTest extends Column {
/**
* Thread to simulate long-running operation on server.
* Note that threading is not allowed by J2EE containers
* conforming to the 1.3 (or earlier) J2EE specification.
* If you plan on deploying an Echo2 user interface to such
* a container, please refrain from using this class as
* an example.
*/
private class SimulatedServerOperation
extends Thread {
private int percentComplete = 0;
public void run() {
while (percentComplete < 100) {
percentComplete += (Math.random() * 20);
if (percentComplete > 100) {
percentComplete = 100;
}
ApplicationInstance app = getApplicationInstance();
if (app != null) {
app.enqueueTask(taskQueue, new ProgressUpdateTask(percentComplete));
try {
Thread.sleep((long) (Math.random() * 1000));
} catch (InterruptedException ex) { }
}
}
}
}
private class ProgressUpdateTask
implements Runnable {
private int percentComplete;
private ProgressUpdateTask(int percentComplete) {
this.percentComplete = percentComplete;
}
/**
* @see java.lang.Runnable#run()
*/
public void run() {
if (percentComplete < 100) {
statusLabel.setText("Asynchronous operation in progress; " + percentComplete
+ "% complete.");
} else {
statusLabel.setText("Asynchronous operation complete.");
getApplicationInstance().removeTaskQueue(taskQueue);
taskQueue = null;
}
}
}
private TaskQueueHandle taskQueue;
private Label statusLabel;
public PushTest() {
super();
SplitPaneLayoutData splitPaneLayoutData = new SplitPaneLayoutData();
splitPaneLayoutData.setInsets(new Insets(10));
setLayoutData(splitPaneLayoutData);
setCellSpacing(new Extent(20));
statusLabel = new Label("Asynchronous operation not active.");
add(statusLabel);
Button startButton = new Button("Start Asynchronous (Server Push) Operation");
startButton.setStyleName("Default");
startButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (taskQueue == null) {
// Only start new operation if taskQueue is null, indicating that last operation has completed.
taskQueue = getApplicationInstance().createTaskQueue();
new SimulatedServerOperation().start();
}
}
});
add(startButton);
}
/**
* @see nextapp.echo2.app.Component#dispose()
*/
public void dispose() {
if (taskQueue != null) {
getApplicationInstance().removeTaskQueue(taskQueue);
}
super.dispose();
}
}