Source Code Cross Referenced for AutoStateTracker.java in  » 6.0-JDK-Modules » j2me » com » sun » midp » automation » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » com.sun.midp.automation 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *   
003:         *
004:         * Copyright  1990-2007 Sun Microsystems, Inc. All Rights Reserved.
005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
006:         * 
007:         * This program is free software; you can redistribute it and/or
008:         * modify it under the terms of the GNU General Public License version
009:         * 2 only, as published by the Free Software Foundation.
010:         * 
011:         * This program is distributed in the hope that it will be useful, but
012:         * WITHOUT ANY WARRANTY; without even the implied warranty of
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014:         * General Public License version 2 for more details (a copy is
015:         * included at /legal/license.txt).
016:         * 
017:         * You should have received a copy of the GNU General Public License
018:         * version 2 along with this work; if not, write to the Free Software
019:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA
021:         * 
022:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
023:         * Clara, CA 95054 or visit www.sun.com if you need additional
024:         * information or have any questions.
025:         */
026:
027:        package com.sun.midp.automation;
028:
029:        /**
030:         * Utility class for tracking states
031:         */
032:        class AutoStateTracker {
033:            /**
034:             * Protected by 'this' lock
035:             */
036:
037:            /** Current state */
038:            private Object currentState;
039:
040:            /** Number of waiters currently waiting */
041:            private int totalWaiters;
042:
043:            /** flag, indicating that wait must be interrupted */
044:            private boolean interruptWait;
045:
046:            /**
047:             * Protected by wakeWaitersLock
048:             */
049:
050:            /** Lock used to wait for waiters to awake */
051:            private Object wakeWaitersLock;
052:
053:            /** Number of waiters to awake */
054:            private int waitersToWake;
055:
056:            /**
057:             * Constructor
058:             *
059:             * @param initialState initial state
060:             */
061:            AutoStateTracker(Object initialState) {
062:                currentState = initialState;
063:                totalWaiters = 0;
064:                waitersToWake = 0;
065:                interruptWait = false;
066:                wakeWaitersLock = new Object();
067:            }
068:
069:            /**
070:             * Returns current state.
071:             *
072:             * @return current state
073:             */
074:            final Object getCurrentState() {
075:                synchronized (this ) {
076:                    return currentState;
077:                }
078:            }
079:
080:            /** 
081:             * Sets a state. 
082:             * Assumption: only one thread sets a state, 
083:             * 'this' lock shouldn't be already taken.
084:             *
085:             * @param state state to set as current
086:             * @param interrupt if true, interrupt all waiters 
087:             * after setting a state.
088:             */
089:            final void setCurrentState(Object state, boolean interrupt) {
090:                synchronized (this ) {
091:                    if (currentState == state) {
092:                        return;
093:                    }
094:
095:                    interruptWait = interrupt;
096:                    currentState = state;
097:                    waitersToWake = totalWaiters;
098:                    notifyAll();
099:                }
100:
101:                // wait until all waiters have been awaken, so they have 
102:                // a chance to recheck condition they are waiting for
103:                synchronized (wakeWaitersLock) {
104:                    while (waitersToWake != 0) {
105:                        try {
106:                            wakeWaitersLock.wait();
107:                        } catch (InterruptedException e) {
108:                            // just ignore
109:                        }
110:                    }
111:                }
112:            }
113:
114:            /**
115:             * Interrupts waiters
116:             */
117:            final void interruptWait() {
118:                synchronized (this ) {
119:                    interruptWait = true;
120:                    notifyAll();
121:                }
122:            }
123:
124:            /**
125:             * Checks condition waiters are waiting for:
126:             * specified state has been reached.
127:             * Assumption: 'this' lock is already taken.
128:             *
129:             * @param state state to check againts
130:             * @return true, if specified state has been reached
131:             */
132:            protected boolean isStateReached(Object state) {
133:                return (currentState == state);
134:            }
135:
136:            /**
137:             * Waits until specified state has been reached.
138:             *
139:             * @param state state to wait for
140:             */
141:            final void waitFor(Object state) {
142:                synchronized (this ) {
143:                    while (!isStateReached(state) && !interruptWait) {
144:                        try {
145:                            totalWaiters++;
146:                            wait();
147:                            totalWaiters--;
148:
149:                            synchronized (wakeWaitersLock) {
150:                                waitersToWake--;
151:                                // if all threads affected by setCurrentState 
152:                                // notification have waken up, notify setCurrentState
153:                                // about it
154:                                if (waitersToWake == 0) {
155:                                    wakeWaitersLock.notify();
156:                                }
157:                            }
158:                        } catch (InterruptedException e) {
159:                            // just ignore
160:                        }
161:                    }
162:                }
163:            }
164:        }
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