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| 1 | +/* | |
| 2 | + * Copyright (c) 2000, 2001, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package sun.print; | |
| 27 | + | |
| 28 | +import java.util.Vector; | |
| 29 | + | |
| 30 | +import javax.print.PrintService; | |
| 31 | +import javax.print.attribute.PrintServiceAttributeSet; | |
| 32 | +import javax.print.attribute.HashPrintServiceAttributeSet; | |
| 33 | +import javax.print.event.PrintServiceAttributeEvent; | |
| 34 | +import javax.print.event.PrintServiceAttributeListener; | |
| 35 | + | |
| 36 | +/* | |
| 37 | + * A utility class usable by all print services for managing listeners | |
| 38 | + * The services create an instance and delegate the listener callback | |
| 39 | + * management to this class. The ServiceNotifier calls back to the service | |
| 40 | + * to obtain the state of the attributes and notifies the listeners of | |
| 41 | + * any changes. | |
| 42 | + */ | |
| 43 | +class ServiceNotifier extends Thread { | |
| 44 | + | |
| 45 | + private PrintService service; | |
| 46 | + private Vector listeners; | |
| 47 | + private boolean stop = false; | |
| 48 | + private PrintServiceAttributeSet lastSet; | |
| 49 | + | |
| 50 | + ServiceNotifier(PrintService service) { | |
| 51 | + super(service.getName() + " notifier"); | |
| 52 | + this.service = service; | |
| 53 | + listeners = new Vector(); | |
| 54 | + try { | |
| 55 | + setPriority(Thread.NORM_PRIORITY-1); | |
| 56 | + setDaemon(true); | |
| 57 | + start(); | |
| 58 | + } catch (SecurityException e) { | |
| 59 | + } | |
| 60 | + } | |
| 61 | + | |
| 62 | + void addListener(PrintServiceAttributeListener listener) { | |
| 63 | + synchronized (this) { | |
| 64 | + if (listener == null || listeners == null) { | |
| 65 | + return; | |
| 66 | + } | |
| 67 | + listeners.add(listener); | |
| 68 | + } | |
| 69 | + } | |
| 70 | + | |
| 71 | + void removeListener(PrintServiceAttributeListener listener) { | |
| 72 | + synchronized (this) { | |
| 73 | + if (listener == null || listeners == null) { | |
| 74 | + return; | |
| 75 | + } | |
| 76 | + listeners.remove(listener); | |
| 77 | + } | |
| 78 | + } | |
| 79 | + | |
| 80 | + boolean isEmpty() { | |
| 81 | + return (listeners == null || listeners.isEmpty()); | |
| 82 | + } | |
| 83 | + | |
| 84 | + void stopNotifier() { | |
| 85 | + stop = true; | |
| 86 | + } | |
| 87 | + | |
| 88 | + /* If a service submits a job it may call this method which may prompt | |
| 89 | + * immediate notification of listeners. | |
| 90 | + */ | |
| 91 | + void wake() { | |
| 92 | + try { | |
| 93 | + interrupt(); | |
| 94 | + } catch (SecurityException e) { | |
| 95 | + } | |
| 96 | + } | |
| 97 | + | |
| 98 | + /* A heuristic is used to calculate sleep time. | |
| 99 | + * 10 times the time taken to loop through all the listeners, with | |
| 100 | + * a minimum of 15 seconds. Ensures this won't take more than 10% | |
| 101 | + * of available time. | |
| 102 | + */ | |
| 103 | + public void run() { | |
| 104 | + | |
| 105 | + long minSleepTime = 15000; | |
| 106 | + long sleepTime = 2000; | |
| 107 | + HashPrintServiceAttributeSet attrs; | |
| 108 | + PrintServiceAttributeEvent attrEvent; | |
| 109 | + PrintServiceAttributeListener listener; | |
| 110 | + PrintServiceAttributeSet psa; | |
| 111 | + | |
| 112 | + while (!stop) { | |
| 113 | + try { | |
| 114 | + Thread.sleep(sleepTime); | |
| 115 | + } catch (InterruptedException e) { | |
| 116 | + } | |
| 117 | + synchronized (this) { | |
| 118 | + if (listeners == null) { | |
| 119 | + continue; | |
| 120 | + } | |
| 121 | + long startTime = System.currentTimeMillis(); | |
| 122 | + if (listeners != null) { | |
| 123 | + if (service instanceof AttributeUpdater) { | |
| 124 | + psa = | |
| 125 | + ((AttributeUpdater)service).getUpdatedAttributes(); | |
| 126 | + } else { | |
| 127 | + psa = service.getAttributes(); | |
| 128 | + } | |
| 129 | + if (psa != null && !psa.isEmpty()) { | |
| 130 | + for (int i = 0; i < listeners.size() ; i++) { | |
| 131 | + listener = (PrintServiceAttributeListener) | |
| 132 | + listeners.elementAt(i); | |
| 133 | + attrs = | |
| 134 | + new HashPrintServiceAttributeSet(psa); | |
| 135 | + attrEvent = | |
| 136 | + new PrintServiceAttributeEvent(service, attrs); | |
| 137 | + listener.attributeUpdate(attrEvent); | |
| 138 | + } | |
| 139 | + } | |
| 140 | + } | |
| 141 | + sleepTime = (System.currentTimeMillis()-startTime)*10; | |
| 142 | + if (sleepTime < minSleepTime) { | |
| 143 | + sleepTime = minSleepTime; | |
| 144 | + } | |
| 145 | + } | |
| 146 | + } | |
| 147 | + } | |
| 148 | + | |
| 149 | +} | |