java.util.concurrent.atomic.DoubleAccumulator#accumulate()源码实例Demo

/**
 * doubleValue returns current value.
 */
public void testDoubleValue() {
    DoubleAccumulator ai = new DoubleAccumulator(Double::max, 0.0);
    assertEquals(0.0, ai.doubleValue());
    ai.accumulate(1.0);
    assertEquals(1.0, ai.doubleValue());
}
 

static void testDoubleAccumulator() {
    DoubleBinaryOperator plus = (DoubleBinaryOperator & Serializable) (x, y) -> x + y;
    DoubleAccumulator a = new DoubleAccumulator(plus, 13.9d);
    a.accumulate(17.5d);
    DoubleAccumulator result = echo(a);
    if (result.get() != a.get())
        throw new RuntimeException("Unexpected value");
    a.reset();
    result.reset();
    if (result.get() != a.get())
        throw new RuntimeException("Unexpected value after reset");

    checkSerialClassName(a, "java.util.concurrent.atomic.DoubleAccumulator$SerializationProxy");
}
 

static void testDoubleAccumulator() {
    DoubleBinaryOperator plus = (DoubleBinaryOperator & Serializable) (x, y) -> x + y;
    DoubleAccumulator a = new DoubleAccumulator(plus, 13.9d);
    a.accumulate(17.5d);
    DoubleAccumulator result = echo(a);
    if (result.get() != a.get())
        throw new RuntimeException("Unexpected value");
    a.reset();
    result.reset();
    if (result.get() != a.get())
        throw new RuntimeException("Unexpected value after reset");

    checkSerialClassName(a, "java.util.concurrent.atomic.DoubleAccumulator$SerializationProxy");
}
 

/**
 * getThenReset() returns current value; subsequent get() returns zero
 */
public void testGetThenReset() {
    DoubleAccumulator ai = new DoubleAccumulator(Double::max, 0.0);
    ai.accumulate(2.0);
    assertEquals(2.0, ai.get());
    assertEquals(2.0, ai.getThenReset());
    assertEquals(0.0, ai.get());
}
 

static void testDoubleAccumulator() {
    DoubleBinaryOperator plus = (DoubleBinaryOperator & Serializable) (x, y) -> x + y;
    DoubleAccumulator a = new DoubleAccumulator(plus, 13.9d);
    a.accumulate(17.5d);
    DoubleAccumulator result = echo(a);
    if (result.get() != a.get())
        throw new RuntimeException("Unexpected value");
    a.reset();
    result.reset();
    if (result.get() != a.get())
        throw new RuntimeException("Unexpected value after reset");

    checkSerialClassName(a, "java.util.concurrent.atomic.DoubleAccumulator$SerializationProxy");
}
 

static void testDoubleAccumulator() {
    DoubleBinaryOperator plus = (DoubleBinaryOperator & Serializable) (x, y) -> x + y;
    DoubleAccumulator a = new DoubleAccumulator(plus, 13.9d);
    a.accumulate(17.5d);
    DoubleAccumulator result = echo(a);
    if (result.get() != a.get())
        throw new RuntimeException("Unexpected value");
    a.reset();
    result.reset();
    if (result.get() != a.get())
        throw new RuntimeException("Unexpected value after reset");

    checkSerialClassName(a, "java.util.concurrent.atomic.DoubleAccumulator$SerializationProxy");
}
 

static void testDoubleAccumulator() {
    DoubleBinaryOperator plus = (DoubleBinaryOperator & Serializable) (x, y) -> x + y;
    DoubleAccumulator a = new DoubleAccumulator(plus, 13.9d);
    a.accumulate(17.5d);
    DoubleAccumulator result = echo(a);
    if (result.get() != a.get())
        throw new RuntimeException("Unexpected value");
    a.reset();
    result.reset();
    if (result.get() != a.get())
        throw new RuntimeException("Unexpected value after reset");

    checkSerialClassName(a, "java.util.concurrent.atomic.DoubleAccumulator$SerializationProxy");
}
 

/**
 * accumulate accumulates given value to current, and get returns current value
 */
public void testAccumulateAndGet() {
    DoubleAccumulator ai = new DoubleAccumulator(Double::max, 0.0);
    ai.accumulate(2.0);
    assertEquals(2.0, ai.get());
    ai.accumulate(-4.0);
    assertEquals(2.0, ai.get());
    ai.accumulate(4.0);
    assertEquals(4.0, ai.get());
}
 

/**
 * reset() causes subsequent get() to return zero
 */
public void testReset() {
    DoubleAccumulator ai = new DoubleAccumulator(Double::max, 0.0);
    ai.accumulate(2.0);
    assertEquals(2.0, ai.get());
    ai.reset();
    assertEquals(0.0, ai.get());
}
 

/**
 * getThenReset() returns current value; subsequent get() returns zero
 */
public void testGetThenReset() {
    DoubleAccumulator ai = new DoubleAccumulator(Double::max, 0.0);
    ai.accumulate(2.0);
    assertEquals(2.0, ai.get());
    assertEquals(2.0, ai.getThenReset());
    assertEquals(0.0, ai.get());
}
 

static void testDoubleAccumulator() {
    DoubleBinaryOperator plus = (DoubleBinaryOperator & Serializable) (x, y) -> x + y;
    DoubleAccumulator a = new DoubleAccumulator(plus, 13.9d);
    a.accumulate(17.5d);
    DoubleAccumulator result = echo(a);
    if (result.get() != a.get())
        throw new RuntimeException("Unexpected value");
    a.reset();
    result.reset();
    if (result.get() != a.get())
        throw new RuntimeException("Unexpected value after reset");

    checkSerialClassName(a, "java.util.concurrent.atomic.DoubleAccumulator$SerializationProxy");
}
 

/**
 * intValue returns current value.
 */
public void testIntValue() {
    DoubleAccumulator ai = new DoubleAccumulator(Double::max, 0.0);
    assertEquals(0, ai.intValue());
    ai.accumulate(1.0);
    assertEquals(1, ai.intValue());
}
 

/**
 * longValue returns current value.
 */
public void testLongValue() {
    DoubleAccumulator ai = new DoubleAccumulator(Double::max, 0.0);
    assertEquals(0, ai.longValue());
    ai.accumulate(1.0);
    assertEquals(1, ai.longValue());
}
 

/**
 * floatValue returns current value.
 */
public void testFloatValue() {
    DoubleAccumulator ai = new DoubleAccumulator(Double::max, 0.0);
    assertEquals(0.0f, ai.floatValue());
    ai.accumulate(1.0);
    assertEquals(1.0f, ai.floatValue());
}
 

/**
 * doubleValue returns current value.
 */
public void testDoubleValue() {
    DoubleAccumulator ai = new DoubleAccumulator(Double::max, 0.0);
    assertEquals(0.0, ai.doubleValue());
    ai.accumulate(1.0);
    assertEquals(1.0, ai.doubleValue());
}
 

public void run() {
    phaser.arriveAndAwaitAdvance();
    DoubleAccumulator a = acc;
    for (int i = 0; i < incs; ++i)
        a.accumulate(i);
    result = a.get();
    phaser.arrive();
}
 

static void testDoubleAccumulator() {
    DoubleBinaryOperator plus = (DoubleBinaryOperator & Serializable) (x, y) -> x + y;
    DoubleAccumulator a = new DoubleAccumulator(plus, 13.9d);
    a.accumulate(17.5d);
    DoubleAccumulator result = echo(a);
    if (result.get() != a.get())
        throw new RuntimeException("Unexpected value");
    a.reset();
    result.reset();
    if (result.get() != a.get())
        throw new RuntimeException("Unexpected value after reset");

    checkSerialClassName(a, "java.util.concurrent.atomic.DoubleAccumulator$SerializationProxy");
}
 

static void testDoubleAccumulator() {
    DoubleBinaryOperator plus = (DoubleBinaryOperator & Serializable) (x, y) -> x + y;
    DoubleAccumulator a = new DoubleAccumulator(plus, 13.9d);
    a.accumulate(17.5d);
    DoubleAccumulator result = echo(a);
    if (result.get() != a.get())
        throw new RuntimeException("Unexpected value");
    a.reset();
    result.reset();
    if (result.get() != a.get())
        throw new RuntimeException("Unexpected value after reset");

    checkSerialClassName(a, "java.util.concurrent.atomic.DoubleAccumulator$SerializationProxy");
}
 

/**
 * longValue returns current value.
 */
public void testLongValue() {
    DoubleAccumulator ai = new DoubleAccumulator(Double::max, 0.0);
    assertEquals(0, ai.longValue());
    ai.accumulate(1.0);
    assertEquals(1, ai.longValue());
}
 

static void testDoubleAccumulator() {
    DoubleBinaryOperator plus = (DoubleBinaryOperator & Serializable) (x, y) -> x + y;
    DoubleAccumulator a = new DoubleAccumulator(plus, 13.9d);
    a.accumulate(17.5d);
    DoubleAccumulator result = echo(a);
    if (result.get() != a.get())
        throw new RuntimeException("Unexpected value");
    a.reset();
    result.reset();
    if (result.get() != a.get())
        throw new RuntimeException("Unexpected value after reset");

    checkSerialClassName(a, "java.util.concurrent.atomic.DoubleAccumulator$SerializationProxy");
}