Source Code Cross Referenced for SynchronizedInt.java in  » Ajax » Laszlo-4.0.10 » EDU » oswego » cs » dl » util » concurrent » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Ajax » Laszlo 4.0.10 » EDU.oswego.cs.dl.util.concurrent 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:          File: SynchronizedInt.java
003:
004:          Originally written by Doug Lea and released into the public domain.
005:          This may be used for any purposes whatsoever without acknowledgment.
006:          Thanks for the assistance and support of Sun Microsystems Labs,
007:          and everyone contributing, testing, and using this code.
008:
009:          History:
010:          Date       Who                What
011:          19Jun1998  dl               Create public version
012:         */
013:
014:        package EDU.oswego.cs.dl.util.concurrent;
015:
016:        /**
017:         * A class useful for offloading synch for int instance variables.
018:         *
019:         * <p>[<a href="http://gee.cs.oswego.edu/dl/classes/EDU/oswego/cs/dl/util/concurrent/intro.html"> Introduction to this package. </a>]
020:         **/
021:
022:        public class SynchronizedInt extends SynchronizedVariable implements 
023:                Comparable, Cloneable {
024:
025:            protected int value_;
026:
027:            /** 
028:             * Make a new SynchronizedInt with the given initial value,
029:             * and using its own internal lock.
030:             **/
031:            public SynchronizedInt(int initialValue) {
032:                super ();
033:                value_ = initialValue;
034:            }
035:
036:            /** 
037:             * Make a new SynchronizedInt with the given initial value,
038:             * and using the supplied lock.
039:             **/
040:            public SynchronizedInt(int initialValue, Object lock) {
041:                super (lock);
042:                value_ = initialValue;
043:            }
044:
045:            /** 
046:             * Return the current value 
047:             **/
048:            public final int get() {
049:                synchronized (lock_) {
050:                    return value_;
051:                }
052:            }
053:
054:            /** 
055:             * Set to newValue.
056:             * @return the old value 
057:             **/
058:
059:            public int set(int newValue) {
060:                synchronized (lock_) {
061:                    int old = value_;
062:                    value_ = newValue;
063:                    return old;
064:                }
065:            }
066:
067:            /**
068:             * Set value to newValue only if it is currently assumedValue.
069:             * @return true if successful
070:             **/
071:            public boolean commit(int assumedValue, int newValue) {
072:                synchronized (lock_) {
073:                    boolean success = (assumedValue == value_);
074:                    if (success)
075:                        value_ = newValue;
076:                    return success;
077:                }
078:            }
079:
080:            /** 
081:             * Atomically swap values with another SynchronizedInt.
082:             * Uses identityHashCode to avoid deadlock when
083:             * two SynchronizedInts attempt to simultaneously swap with each other.
084:             * (Note: Ordering via identyHashCode is not strictly guaranteed
085:             * by the language specification to return unique, orderable
086:             * values, but in practice JVMs rely on them being unique.)
087:             * @return the new value 
088:             **/
089:
090:            public int swap(SynchronizedInt other) {
091:                if (other == this )
092:                    return get();
093:                SynchronizedInt fst = this ;
094:                SynchronizedInt snd = other;
095:                if (System.identityHashCode(fst) > System.identityHashCode(snd)) {
096:                    fst = other;
097:                    snd = this ;
098:                }
099:                synchronized (fst.lock_) {
100:                    synchronized (snd.lock_) {
101:                        fst.set(snd.set(fst.get()));
102:                        return get();
103:                    }
104:                }
105:            }
106:
107:            /** 
108:             * Increment the value.
109:             * @return the new value 
110:             **/
111:            public int increment() {
112:                synchronized (lock_) {
113:                    return ++value_;
114:                }
115:            }
116:
117:            /** 
118:             * Decrement the value.
119:             * @return the new value 
120:             **/
121:            public int decrement() {
122:                synchronized (lock_) {
123:                    return --value_;
124:                }
125:            }
126:
127:            /** 
128:             * Add amount to value (i.e., set value += amount)
129:             * @return the new value 
130:             **/
131:            public int add(int amount) {
132:                synchronized (lock_) {
133:                    return value_ += amount;
134:                }
135:            }
136:
137:            /** 
138:             * Subtract amount from value (i.e., set value -= amount)
139:             * @return the new value 
140:             **/
141:            public int subtract(int amount) {
142:                synchronized (lock_) {
143:                    return value_ -= amount;
144:                }
145:            }
146:
147:            /** 
148:             * Multiply value by factor (i.e., set value *= factor)
149:             * @return the new value 
150:             **/
151:            public synchronized int multiply(int factor) {
152:                synchronized (lock_) {
153:                    return value_ *= factor;
154:                }
155:            }
156:
157:            /** 
158:             * Divide value by factor (i.e., set value /= factor)
159:             * @return the new value 
160:             **/
161:            public int divide(int factor) {
162:                synchronized (lock_) {
163:                    return value_ /= factor;
164:                }
165:            }
166:
167:            /** 
168:             * Set the value to the negative of its old value
169:             * @return the new value 
170:             **/
171:            public int negate() {
172:                synchronized (lock_) {
173:                    value_ = -value_;
174:                    return value_;
175:                }
176:            }
177:
178:            /** 
179:             * Set the value to its complement
180:             * @return the new value 
181:             **/
182:            public int complement() {
183:                synchronized (lock_) {
184:                    value_ = ~value_;
185:                    return value_;
186:                }
187:            }
188:
189:            /** 
190:             * Set value to value &amp; b.
191:             * @return the new value 
192:             **/
193:            public int and(int b) {
194:                synchronized (lock_) {
195:                    value_ = value_ & b;
196:                    return value_;
197:                }
198:            }
199:
200:            /** 
201:             * Set value to value | b.
202:             * @return the new value 
203:             **/
204:            public int or(int b) {
205:                synchronized (lock_) {
206:                    value_ = value_ | b;
207:                    return value_;
208:                }
209:            }
210:
211:            /** 
212:             * Set value to value ^ b.
213:             * @return the new value 
214:             **/
215:            public int xor(int b) {
216:                synchronized (lock_) {
217:                    value_ = value_ ^ b;
218:                    return value_;
219:                }
220:            }
221:
222:            public int compareTo(int other) {
223:                int val = get();
224:                return (val < other) ? -1 : (val == other) ? 0 : 1;
225:            }
226:
227:            public int compareTo(SynchronizedInt other) {
228:                return compareTo(other.get());
229:            }
230:
231:            public int compareTo(Object other) {
232:                return compareTo((SynchronizedInt) other);
233:            }
234:
235:            public boolean equals(Object other) {
236:                if (other != null && other instanceof  SynchronizedInt)
237:                    return get() == ((SynchronizedInt) other).get();
238:                else
239:                    return false;
240:            }
241:
242:            public int hashCode() {
243:                return get();
244:            }
245:
246:            public String toString() {
247:                return String.valueOf(get());
248:            }
249:
250:        }
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