java.util.concurrent.atomic.AtomicLongFieldUpdater#set()源码实例Demo

/**
 * get returns the last value set or assigned
 */
public void testGetSet() {
    AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
    a = updaterFor("x");
    x = 1;
    assertEquals(1, a.get(this));
    a.set(this, 2);
    assertEquals(2, a.get(this));
    a.set(this, -3);
    assertEquals(-3, a.get(this));
}
 

/**
 * getAndIncrement returns previous value and increments
 */
public void testGetAndIncrement() {
    AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
    a = updaterFor("x");
    x = 1;
    assertEquals(1, a.getAndIncrement(this));
    assertEquals(2, a.get(this));
    a.set(this, -2);
    assertEquals(-2, a.getAndIncrement(this));
    assertEquals(-1, a.getAndIncrement(this));
    assertEquals(0, a.getAndIncrement(this));
    assertEquals(1, a.get(this));
}
 

/**
 * incrementAndGet increments and returns current value
 */
public void testIncrementAndGet() {
    AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
    a = updaterFor("x");
    x = 1;
    assertEquals(2, a.incrementAndGet(this));
    assertEquals(2, a.get(this));
    a.set(this, -2);
    assertEquals(-1, a.incrementAndGet(this));
    assertEquals(0, a.incrementAndGet(this));
    assertEquals(1, a.incrementAndGet(this));
    assertEquals(1, a.get(this));
}
 

/**
 * AtomicLongFieldUpdater getAndUpdate returns previous value and updates
 * result of supplied function
 */
public void testLongFieldUpdaterGetAndUpdate() {
    AtomicLongFieldUpdater a = aLongFieldUpdater();
    a.set(this, 1);
    assertEquals(1L, a.getAndUpdate(this, Atomic8Test::addLong17));
    assertEquals(18L, a.getAndUpdate(this, Atomic8Test::addLong17));
    assertEquals(35L, a.get(this));
    assertEquals(35L, aLongField);
}
 

/**
 * AtomicLongFieldUpdater updateAndGet updates with supplied function and
 * returns result.
 */
public void testLongFieldUpdaterUpdateAndGet() {
    AtomicLongFieldUpdater a = aLongFieldUpdater();
    a.set(this, 1);
    assertEquals(18L, a.updateAndGet(this, Atomic8Test::addLong17));
    assertEquals(35L, a.updateAndGet(this, Atomic8Test::addLong17));
    assertEquals(35L, a.get(this));
    assertEquals(35L, aLongField);
}
 

/**
 * AtomicLongFieldUpdater getAndAccumulate returns previous value
 * and updates with supplied function.
 */
public void testLongFieldUpdaterGetAndAccumulate() {
    AtomicLongFieldUpdater a = aLongFieldUpdater();
    a.set(this, 1);
    assertEquals(1L, a.getAndAccumulate(this, 2L, Long::sum));
    assertEquals(3L, a.getAndAccumulate(this, 3L, Long::sum));
    assertEquals(6L, a.get(this));
    assertEquals(6L, aLongField);
}
 

/**
 * AtomicLongFieldUpdater accumulateAndGet updates with supplied
 * function and returns result.
 */
public void testLongFieldUpdaterAccumulateAndGet() {
    AtomicLongFieldUpdater a = aLongFieldUpdater();
    a.set(this, 1);
    assertEquals(7L, a.accumulateAndGet(this, 6L, Long::sum));
    assertEquals(10L, a.accumulateAndGet(this, 3L, Long::sum));
    assertEquals(10L, a.get(this));
    assertEquals(10L, aLongField);
}
 

/**
 * Object arguments for parameters of type T that are not
 * instances of the class passed to the newUpdater call will
 * result in a ClassCastException being thrown.
 */
public void testFieldUpdaters_ClassCastException() {
    // Use raw types to allow passing wrong object type, provoking CCE
    final AtomicLongFieldUpdater longUpdater = aLongFieldUpdater();
    final AtomicIntegerFieldUpdater intUpdater = anIntFieldUpdater();
    final AtomicReferenceFieldUpdater refUpdater = anIntegerFieldUpdater();
    final Object obj = new Object();
    for (Object x : new Object[]{ new Object(), null }) {
        Runnable[] throwingActions = {
            () -> longUpdater.get(x),
            () -> intUpdater.get(x),
            () -> refUpdater.get(x),

            () -> longUpdater.set(x, 17L),
            () -> intUpdater.set(x, 17),
            () -> refUpdater.set(x, (Integer) 17),

            () -> longUpdater.addAndGet(x, 17L),
            () -> intUpdater.addAndGet(x, 17),

            () -> longUpdater.getAndUpdate(x, y -> y),
            () -> intUpdater.getAndUpdate(x, y -> y),
            () -> refUpdater.getAndUpdate(x, y -> y),

            () -> longUpdater.compareAndSet(x, 17L, 42L),
            () -> intUpdater.compareAndSet(x, 17, 42),
            () -> refUpdater.compareAndSet(x, (Integer) 17, (Integer) 42),
        };
        assertThrows(ClassCastException.class, throwingActions);
    }
}
 

/**
 * get returns the last value set or assigned
 */
public void testGetSet() {
    AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
    a = updaterFor("x");
    x = 1;
    assertEquals(1, a.get(this));
    a.set(this, 2);
    assertEquals(2, a.get(this));
    a.set(this, -3);
    assertEquals(-3, a.get(this));
}
 

/**
 * getAndIncrement returns previous value and increments
 */
public void testGetAndIncrement() {
    AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
    a = updaterFor("x");
    x = 1;
    assertEquals(1, a.getAndIncrement(this));
    assertEquals(2, a.get(this));
    a.set(this, -2);
    assertEquals(-2, a.getAndIncrement(this));
    assertEquals(-1, a.getAndIncrement(this));
    assertEquals(0, a.getAndIncrement(this));
    assertEquals(1, a.get(this));
}
 

/**
 * incrementAndGet increments and returns current value
 */
public void testIncrementAndGet() {
    AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
    a = updaterFor("x");
    x = 1;
    assertEquals(2, a.incrementAndGet(this));
    assertEquals(2, a.get(this));
    a.set(this, -2);
    assertEquals(-1, a.incrementAndGet(this));
    assertEquals(0, a.incrementAndGet(this));
    assertEquals(1, a.incrementAndGet(this));
    assertEquals(1, a.get(this));
}
 

/**
 * AtomicLongFieldUpdater getAndUpdate returns previous value and updates
 * result of supplied function
 */
public void testLongFieldUpdaterGetAndUpdate() {
    AtomicLongFieldUpdater a = aLongFieldUpdater();
    a.set(this, 1);
    assertEquals(1L, a.getAndUpdate(this, Atomic8Test::addLong17));
    assertEquals(18L, a.getAndUpdate(this, Atomic8Test::addLong17));
    assertEquals(35L, a.get(this));
    assertEquals(35L, aLongField);
}
 

/**
 * AtomicLongFieldUpdater updateAndGet updates with supplied function and
 * returns result.
 */
public void testLongFieldUpdaterUpdateAndGet() {
    AtomicLongFieldUpdater a = aLongFieldUpdater();
    a.set(this, 1);
    assertEquals(18L, a.updateAndGet(this, Atomic8Test::addLong17));
    assertEquals(35L, a.updateAndGet(this, Atomic8Test::addLong17));
    assertEquals(35L, a.get(this));
    assertEquals(35L, aLongField);
}
 

/**
 * AtomicLongFieldUpdater getAndAccumulate returns previous value
 * and updates with supplied function.
 */
public void testLongFieldUpdaterGetAndAccumulate() {
    AtomicLongFieldUpdater a = aLongFieldUpdater();
    a.set(this, 1);
    assertEquals(1L, a.getAndAccumulate(this, 2L, Long::sum));
    assertEquals(3L, a.getAndAccumulate(this, 3L, Long::sum));
    assertEquals(6L, a.get(this));
    assertEquals(6L, aLongField);
}
 

/**
 * AtomicLongFieldUpdater accumulateAndGet updates with supplied
 * function and returns result.
 */
public void testLongFieldUpdaterAccumulateAndGet() {
    AtomicLongFieldUpdater a = aLongFieldUpdater();
    a.set(this, 1);
    assertEquals(7L, a.accumulateAndGet(this, 6L, Long::sum));
    assertEquals(10L, a.accumulateAndGet(this, 3L, Long::sum));
    assertEquals(10L, a.get(this));
    assertEquals(10L, aLongField);
}