com.github.segmentio.stats.AtomicDouble Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of analytics Show documentation

The analytics API you've always wanted.

The newest version!

package com.github.segmentio.stats;

import static java.lang.Double.doubleToLongBits;

import java.util.concurrent.atomic.AtomicLong;

/**
 * A thread-safe and lock-free double implementation
 * based on this stack overflow answer:
 * http://stackoverflow.com/questions/5505460/java-is-there-no-atomicfloat-or-atomicdouble
 *
 */
class AtomicDouble extends Number {

	private static final long serialVersionUID = -2480549991498013056L;
	private AtomicLong bits;

	public AtomicDouble() {
		this(0);
	}

	public AtomicDouble(double initialValue) {
		bits = new AtomicLong(doubleToLongBits(initialValue));
	}

	public final boolean compareAndSet(double expect, double update) {
		return bits.compareAndSet(doubleToLongBits(expect),
				doubleToLongBits(update));
	}

	public final void set(double newValue) {
		bits.set(doubleToLongBits(newValue));
	}

	public final double get() {

		return Double.longBitsToDouble(bits.get());
	}

	public float floatValue() {
		return (float)get();
	}

	public final double addAndGet(double newValue) {
		return Double.longBitsToDouble(bits.addAndGet(doubleToLongBits(newValue)));
	}

	public final double getAndSet(double newValue) {
		return Double.longBitsToDouble(bits.getAndSet(doubleToLongBits(newValue)));
	}

	public final boolean weakCompareAndSet(float expect, float update) {
		return bits.weakCompareAndSet(doubleToLongBits(expect),
				doubleToLongBits(update));
	}

	public double doubleValue() {
		return (double) floatValue();
	}

	public int intValue() {
		return (int) get();
	}

	public long longValue() {
		return (long) get();
	}

}