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PC World Komputer 1995 November
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progressbusy.java
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1995-08-11
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/*
* @(#)ProgressBusy.java 1.2 95/05/11 Chris Warth
*
* Copyright (c) 1995 Sun Microsystems, Inc. All Rights Reserved.
*
* Permission to use, copy, modify, and distribute this software
* and its documentation for NON-COMMERCIAL purposes and without
* fee is hereby granted provided that this copyright notice
* appears in all copies. Please refer to the file "copyright.html"
* for further important copyright and licensing information.
*
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
* THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
* TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
*/
package browser;
import net.ProgressEntry;
import net.ProgressData;
class ProgressBusy extends Thread {
ProgressWindow target;
ProgressBusy(ProgressWindow w) {
target = w;
start();
}
synchronized void wakeUp() {
notify();
}
synchronized void waitForWork(boolean foundwork) {
// if we found work the last time around we only wait a short time,
// otherwise we wait forever for some new work to arrive.
// This is to avoid having this thread suck up resources when there
// is nothing to draw.
//
wait((foundwork ? 100 : 0));
}
public void run() {
ProgressEntry plist[] = ProgressData.pdata.streams;
int pos = 0;
int oldpos = 0;
int direction = +5;
setName("Progress Busy Loop");
while (true) {
boolean foundwork = false;
for (int i = 0 ; i < plist.length; i++) {
ProgressEntry pe = plist[i];
if (pe != null && pe.connected == false) {
target.busyPaint(i, oldpos, pos);
foundwork = true;
}
}
waitForWork(foundwork);
oldpos = pos;
pos += direction;
if (pos > 100) {
pos = 100 - (pos - 100);
direction = -direction;
} else if (pos < 0) {
pos = -pos;
direction = -direction;
}
}
}
}