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| 1 | /* | ||
| 2 | * Copyright (c) 2003, 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.management; | ||
| 27 | |||
| 28 | import java.lang.management.MemoryUsage; | ||
| 29 | import java.util.Iterator; | ||
| 30 | import java.util.Map; | ||
| 31 | import java.util.HashMap; | ||
| 32 | |||
| 33 | /** | ||
| 34 | * An abstract sensor. | ||
| 35 | * | ||
| 36 | * <p> | ||
| 37 | * A <tt>AbstractSensor</tt> object consists of two attributes: | ||
| 38 | * <ul> | ||
| 39 | * <li><tt>on</tt> is a boolean flag indicating if a sensor is | ||
| 40 | * triggered. This flag will be set or cleared by the | ||
| 41 | * component that owns the sensor.</li> | ||
| 42 | * <li><tt>count</tt> is the total number of times that a sensor | ||
| 43 | * has been triggered.</li> | ||
| 44 | * </ul> | ||
| 45 | * | ||
| 46 | * @author Mandy Chung | ||
| 47 | * @since 1.5 | ||
| 48 | */ | ||
| 49 | |||
| 50 | public abstract class Sensor { | ||
| 51 | private Object lock; | ||
| 52 | private String name; | ||
| 53 | private long count; | ||
| 54 | private boolean on; | ||
| 55 | |||
| 56 | /** | ||
| 57 | * Constructs a <tt>Sensor</tt> object. | ||
| 58 | * | ||
| 59 | * @param name The name of this sensor. | ||
| 60 | */ | ||
| 61 | public Sensor(String name) { | ||
| 62 | this.name = name; | ||
| 63 | this.count = 0; | ||
| 64 | this.on = false; | ||
| 65 | this.lock = new Object(); | ||
| 66 | } | ||
| 67 | |||
| 68 | /** | ||
| 69 | * Returns the name of this sensor. | ||
| 70 | * | ||
| 71 | * @return the name of this sensor. | ||
| 72 | */ | ||
| 73 | public String getName() { | ||
| 74 | return name; | ||
| 75 | } | ||
| 76 | |||
| 77 | /** | ||
| 78 | * Returns the total number of times that this sensor has been triggered. | ||
| 79 | * | ||
| 80 | * @return the total number of times that this sensor has been triggered. | ||
| 81 | */ | ||
| 82 | public long getCount() { | ||
| 83 | synchronized (lock) { | ||
| 84 | return count; | ||
| 85 | } | ||
| 86 | } | ||
| 87 | |||
| 88 | /** | ||
| 89 | * Tests if this sensor is currently on. | ||
| 90 | * | ||
| 91 | * @return <tt>true</tt> if the sensor is currently on; | ||
| 92 | * <tt>false</tt> otherwise. | ||
| 93 | * | ||
| 94 | */ | ||
| 95 | public boolean isOn() { | ||
| 96 | synchronized (lock) { | ||
| 97 | return on; | ||
| 98 | } | ||
| 99 | } | ||
| 100 | |||
| 101 | /** | ||
| 102 | * Triggers this sensor. This method first sets this sensor on | ||
| 103 | * and increments its sensor count. | ||
| 104 | */ | ||
| 105 | public void trigger() { | ||
| 106 | synchronized (lock) { | ||
| 107 | on = true; | ||
| 108 | count++; | ||
| 109 | } | ||
| 110 | triggerAction(); | ||
| 111 | } | ||
| 112 | |||
| 113 | /** | ||
| 114 | * Triggers this sensor. This method sets this sensor on | ||
| 115 | * and increments the count with the input <tt>increment</tt>. | ||
| 116 | */ | ||
| 117 | public void trigger(int increment) { | ||
| 118 | synchronized (lock) { | ||
| 119 | on = true; | ||
| 120 | count += increment; | ||
| 121 | // Do something here... | ||
| 122 | } | ||
| 123 | triggerAction(); | ||
| 124 | } | ||
| 125 | |||
| 126 | /** | ||
| 127 | * Triggers this sensor piggybacking a memory usage object. | ||
| 128 | * This method sets this sensor on | ||
| 129 | * and increments the count with the input <tt>increment</tt>. | ||
| 130 | */ | ||
| 131 | public void trigger(int increment, MemoryUsage usage) { | ||
| 132 | synchronized (lock) { | ||
| 133 | on = true; | ||
| 134 | count += increment; | ||
| 135 | // Do something here... | ||
| 136 | } | ||
| 137 | triggerAction(usage); | ||
| 138 | } | ||
| 139 | |||
| 140 | /** | ||
| 141 | * Clears this sensor. | ||
| 142 | */ | ||
| 143 | public void clear() { | ||
| 144 | synchronized (lock) { | ||
| 145 | on = false; | ||
| 146 | } | ||
| 147 | clearAction(); | ||
| 148 | } | ||
| 149 | |||
| 150 | |||
| 151 | /** | ||
| 152 | * Clears this sensor | ||
| 153 | * and increments the count with the input <tt>increment</tt>. | ||
| 154 | */ | ||
| 155 | public void clear(int increment) { | ||
| 156 | synchronized (lock) { | ||
| 157 | on = false; | ||
| 158 | count += increment; | ||
| 159 | } | ||
| 160 | clearAction(); | ||
| 161 | } | ||
| 162 | |||
| 163 | public String toString() { | ||
| 164 | return "Sensor - " + getName() + | ||
| 165 | (isOn() ? " on " : " off ") + | ||
| 166 | " count = " + getCount(); | ||
| 167 | } | ||
| 168 | |||
| 169 | abstract void triggerAction(); | ||
| 170 | abstract void triggerAction(MemoryUsage u); | ||
| 171 | abstract void clearAction(); | ||
| 172 | } | ||