Mega Code Archive
Atomic Float
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/*
* @(#)$Id$
*
* Copyright 2006-2008 Makoto YUI
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Contributors:
* Makoto YUI - initial implementation
*/
//package xbird.util.primitive;
import java.util.concurrent.atomic.AtomicInteger;
/**
*
* <DIV lang="en"></DIV>
* <DIV lang="ja"></DIV>
*
* @author Makoto YUI (yuin405+xbird@gmail.com)
*/
public class AtomicFloat extends Number {
private static final long serialVersionUID = 4992180751166673712L;
private final AtomicInteger value;
public AtomicFloat() {
this(0.0f);
}
public AtomicFloat(float value) {
this.value = new AtomicInteger(i(value));
}
public final float get() {
return f(value.get());
}
public final void set(float newValue) {
value.set(i(newValue));
}
public final void lazySet(float newValue) {
value.lazySet(i(newValue));
}
public final float getAndSet(float newValue) {
return f(value.getAndSet(i(newValue)));
}
public final boolean compareAndSet(float expect, float update) {
return value.compareAndSet(i(expect), i(update));
}
public final boolean weakCompareAndSet(float expect, float update) {
return value.weakCompareAndSet(i(expect), i(update));
}
public final float getAndIncrement() {
return getAndAdd(1.0f);
}
public final float getAndDecrement() {
return getAndAdd(-1.0f);
}
public final float getAndAdd(float delta) {
for(;;) {
int icurrent = value.get();
float current = f(icurrent);
float next = current + delta;
int inext = i(next);
if(value.compareAndSet(icurrent, inext)) {
return current;
}
}
}
public final float incrementAndGet() {
return addAndGet(1.0f);
}
public final float decrementAndGet() {
return addAndGet(-1.0f);
}
public final float addAndGet(float delta) {
for(;;) {
int icurrent = value.get();
float current = f(icurrent);
float next = current + delta;
int inext = i(next);
if(value.compareAndSet(icurrent, inext)) {
return next;
}
}
}
public String toString() {
return Float.toString(get());
}
@Override
public int intValue() {
return (int) get();
}
@Override
public long longValue() {
return (long) get();
}
@Override
public float floatValue() {
return get();
}
@Override
public double doubleValue() {
return (double) get();
}
private static final int i(final float f) {
return Float.floatToIntBits(f);
}
private static final float f(final int i) {
return Float.intBitsToFloat(i);
}
}
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