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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 | } | ||