Source Code Cross Referenced for IsolateSynch.java in  » 6.0-JDK-Modules » j2me » com » sun » midp » i3test » 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.i3test 
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.i3test;
028:
029:        import com.sun.cldc.util.Semaphore;
030:
031:        /**
032:         * A simple cross-isolate synchronization mechanism.
033:         * Handles the simple case of synchronizing between two
034:         * isolates, performing "master" and "slave" roles.
035:         * This is useful for cross-isolate unit testing.
036:         * This is a utility class, containing only static methods.
037:         * No instances of this class are ever created.
038:         * 
039:         * <p>This class must be initialized once (presumably the by master),
040:         * by calling init(), before starting the slave isolate.  The master isolate 
041:         * can call awaitReady() to wait for the slave isolate to become ready.
042:         * The slave isolate performs whatever initialization and testing it wants and 
043:         * then calls pause().  This blocks the slave and
044:         * unblocks the master's call to awaitReady(), giving the master the 
045:         * opportunity to inspect the slave's state.  The master can then call 
046:         * signalContinue() to unblock the slave.  Finally, the fini() call will 
047:         * destroy the shared objects created by init().
048:         *
049:         * <p>Example code for master isolate:
050:         * <pre>
051:         * void testAnotherIsolate() {
052:         *     IsolateSynch.init();
053:         *     Isolate iso = new Isolate(start_class, args);
054:         *     iso.start();
055:         *     IsolateSynch.awaitReady();
056:         *     // assertions can be made safely here about the state of the slave
057:         *     IsolateSynch.signalContinue();
058:         *     IsolateSynch.fini();
059:         * }
060:         * </pre>
061:         * <p>Example code for slave isolate:
062:         * <pre>
063:         * public static void main(Strings args[]) {
064:         *     // perform initialization and execute code under test
065:         *     IsolateSynch.pause();
066:         *     // perform any cleanup here
067:         * }
068:         * </pre>
069:         */
070:        public class IsolateSynch {
071:
072:            static Semaphore semReady;
073:            static Semaphore semContinue;
074:
075:            static native Semaphore getSemReady0();
076:
077:            static native Semaphore getSemContinue0();
078:
079:            private static native void init0(Semaphore semReady,
080:                    Semaphore semCont);
081:
082:            private static native void fini0();
083:
084:            private IsolateSynch() {
085:                // disallow creation of instances
086:            }
087:
088:            /**
089:             * Initialize shared objects.
090:             * @throws IllegalStateException if already initialized.
091:             */
092:            public static void init() {
093:                semReady = new Semaphore(0);
094:                semContinue = new Semaphore(0);
095:                init0(semReady, semContinue);
096:            }
097:
098:            /**
099:             * Blocks until the slave pauses, indicating that it's ready.  Intended to
100:             * be called by the master isolate.
101:             */
102:            public static void awaitReady() {
103:                getSemReady0().acquire();
104:            }
105:
106:            /**
107:             * Informs the slave that it can continue after having paused.  Intended 
108:             * to be called by the master isolate.
109:             */
110:            public static void signalContinue() {
111:                getSemContinue0().release();
112:            }
113:
114:            /**
115:             * Blocks the caller and unblocks the master.  Intended to be called by 
116:             * the slave.
117:             */
118:            public static void pause() {
119:                getSemReady0().release();
120:                getSemContinue0().acquire();
121:            }
122:
123:            /**
124:             * Cleans up shared objects.  Does nothing if there is
125:             * nothing to clean up.
126:             */
127:            public static void fini() {
128:                semReady = null;
129:                semContinue = null;
130:                fini0();
131:            }
132:
133:        }
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