/* * Copyright (c) 2000, 2001, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code 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 General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */package sun.print;import java.util.Vector;import javax.print.PrintService;import javax.print.attribute.PrintServiceAttributeSet;import javax.print.attribute.HashPrintServiceAttributeSet;import javax.print.event.PrintServiceAttributeEvent;import javax.print.event.PrintServiceAttributeListener;/* * A utility class usable by all print services for managing listeners * The services create an instance and delegate the listener callback * management to this class. The ServiceNotifier calls back to the service * to obtain the state of the attributes and notifies the listeners of * any changes. */class ServiceNotifier extends Thread { private PrintService service; private Vector listeners; private boolean stop = false; private PrintServiceAttributeSet lastSet; ServiceNotifier(PrintService service) { super(service.getName() + " notifier"); this.service = service; listeners = new Vector(); try { setPriority(Thread.NORM_PRIORITY-1); setDaemon(true); start(); } catch (SecurityException e) { } } void addListener(PrintServiceAttributeListener listener) { synchronized (this) { if (listener == null || listeners == null) { return; } listeners.add(listener); } } void removeListener(PrintServiceAttributeListener listener) { synchronized (this) { if (listener == null || listeners == null) { return; } listeners.remove(listener); } } boolean isEmpty() { return (listeners == null || listeners.isEmpty()); } void stopNotifier() { stop = true; } /* If a service submits a job it may call this method which may prompt * immediate notification of listeners. */ void wake() { try { interrupt(); } catch (SecurityException e) { } } /* A heuristic is used to calculate sleep time. * 10 times the time taken to loop through all the listeners, with * a minimum of 15 seconds. Ensures this won't take more than 10% * of available time. */ public void run() { long minSleepTime = 15000; long sleepTime = 2000; HashPrintServiceAttributeSet attrs; PrintServiceAttributeEvent attrEvent; PrintServiceAttributeListener listener; PrintServiceAttributeSet psa; while (!stop) { try { Thread.sleep(sleepTime); } catch (InterruptedException e) { } synchronized (this) { if (listeners == null) { continue; } long startTime = System.currentTimeMillis(); if (listeners != null) { if (service instanceof AttributeUpdater) { psa = ((AttributeUpdater)service).getUpdatedAttributes(); } else { psa = service.getAttributes(); } if (psa != null && !psa.isEmpty()) { for (int i = 0; i < listeners.size() ; i++) { listener = (PrintServiceAttributeListener) listeners.elementAt(i); attrs = new HashPrintServiceAttributeSet(psa); attrEvent = new PrintServiceAttributeEvent(service, attrs); listener.attributeUpdate(attrEvent); } } } sleepTime = (System.currentTimeMillis()-startTime)*10; if (sleepTime < minSleepTime) { sleepTime = minSleepTime; } } } }}
/*
* Copyright (c) 2000, 2001, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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 General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.print;
import java.util.Vector;
import javax.print.PrintService;
import javax.print.attribute.PrintServiceAttributeSet;
import javax.print.attribute.HashPrintServiceAttributeSet;
import javax.print.event.PrintServiceAttributeEvent;
import javax.print.event.PrintServiceAttributeListener;
/*
* A utility class usable by all print services for managing listeners
* The services create an instance and delegate the listener callback
* management to this class. The ServiceNotifier calls back to the service
* to obtain the state of the attributes and notifies the listeners of
* any changes.
*/
class ServiceNotifier extends Thread {
private PrintService service;
private Vector listeners;
private boolean stop = false;
private PrintServiceAttributeSet lastSet;
ServiceNotifier(PrintService service) {
super(service.getName() + " notifier");
this.service = service;
listeners = new Vector();
try {
setPriority(Thread.NORM_PRIORITY-1);
setDaemon(true);
start();
} catch (SecurityException e) {
}
}
void addListener(PrintServiceAttributeListener listener) {
synchronized (this) {
if (listener == null || listeners == null) {
return;
}
listeners.add(listener);
}
}
void removeListener(PrintServiceAttributeListener listener) {
synchronized (this) {
if (listener == null || listeners == null) {
return;
}
listeners.remove(listener);
}
}
boolean isEmpty() {
return (listeners == null || listeners.isEmpty());
}
void stopNotifier() {
stop = true;
}
/* If a service submits a job it may call this method which may prompt
* immediate notification of listeners.
*/
void wake() {
try {
interrupt();
} catch (SecurityException e) {
}
}
/* A heuristic is used to calculate sleep time.
* 10 times the time taken to loop through all the listeners, with
* a minimum of 15 seconds. Ensures this won't take more than 10%
* of available time.
*/
public void run() {
long minSleepTime = 15000;
long sleepTime = 2000;
HashPrintServiceAttributeSet attrs;
PrintServiceAttributeEvent attrEvent;
PrintServiceAttributeListener listener;
PrintServiceAttributeSet psa;
while (!stop) {
try {
Thread.sleep(sleepTime);
} catch (InterruptedException e) {
}
synchronized (this) {
if (listeners == null) {
continue;
}
long startTime = System.currentTimeMillis();
if (listeners != null) {
if (service instanceof AttributeUpdater) {
psa =
((AttributeUpdater)service).getUpdatedAttributes();
} else {
psa = service.getAttributes();
}
if (psa != null && !psa.isEmpty()) {
for (int i = 0; i < listeners.size() ; i++) {
listener = (PrintServiceAttributeListener)
listeners.elementAt(i);
attrs =
new HashPrintServiceAttributeSet(psa);
attrEvent =
new PrintServiceAttributeEvent(service, attrs);
listener.attributeUpdate(attrEvent);
}
}
}
sleepTime = (System.currentTimeMillis()-startTime)*10;
if (sleepTime < minSleepTime) {
sleepTime = minSleepTime;
}
}
}
}
}