jsr166y.LinkedTransferQueue.xfer java code examples

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}

/**
 * Inserts the specified element at the tail of this queue.
 * As the queue is unbounded, this method will never throw
 * {@link IllegalStateException} or return {@code false}.
 *
 * @return {@code true} (as specified by {@link Collection#add})
 * @throws NullPointerException if the specified element is null
 */
public boolean add(E e) {
  xfer(e, true, ASYNC, 0);
  return true;
}

/**
 * Inserts the specified element at the tail of this queue.
 * As the queue is unbounded, this method will never block.
 *
 * @throws NullPointerException if the specified element is null
 */
public void put(E e) {
  xfer(e, true, ASYNC, 0);
}

/**
 * Inserts the specified element at the tail of this queue.
 * As the queue is unbounded, this method will never return {@code false}.
 *
 * @return {@code true} (as specified by {@link Queue#offer})
 * @throws NullPointerException if the specified element is null
 */
public boolean offer(E e) {
  xfer(e, true, ASYNC, 0);
  return true;
}

/**
 * Transfers the element to a waiting consumer immediately, if possible.
 *
 * <p>More precisely, transfers the specified element immediately
 * if there exists a consumer already waiting to receive it (in
 * {@link #take} or timed {@link #poll(long,TimeUnit) poll}),
 * otherwise returning {@code false} without enqueuing the element.
 *
 * @throws NullPointerException if the specified element is null
 */
public boolean tryTransfer(E e) {
  return xfer(e, true, NOW, 0) == null;
}

public E poll() {
  return xfer(null, false, NOW, 0);
}

/**
 * Inserts the specified element at the tail of this queue.
 * As the queue is unbounded, this method will never block or
 * return {@code false}.
 *
 * @return {@code true} (as specified by
 *  {@link java.util.concurrent.BlockingQueue#offer(Object,long,TimeUnit)
 *  BlockingQueue.offer})
 * @throws NullPointerException if the specified element is null
 */
public boolean offer(E e, long timeout, TimeUnit unit) {
  xfer(e, true, ASYNC, 0);
  return true;
}

public E take() throws InterruptedException {
  E e = xfer(null, false, SYNC, 0);
  if (e != null)
    return e;
  Thread.interrupted();
  throw new InterruptedException();
}

public E poll(long timeout, TimeUnit unit) throws InterruptedException {
  E e = xfer(null, false, TIMED, unit.toNanos(timeout));
  if (e != null || !Thread.interrupted())
    return e;
  throw new InterruptedException();
}

/**
 * Transfers the element to a consumer, waiting if necessary to do so.
 *
 * <p>More precisely, transfers the specified element immediately
 * if there exists a consumer already waiting to receive it (in
 * {@link #take} or timed {@link #poll(long,TimeUnit) poll}),
 * else inserts the specified element at the tail of this queue
 * and waits until the element is received by a consumer.
 *
 * @throws NullPointerException if the specified element is null
 */
public void transfer(E e) throws InterruptedException {
  if (xfer(e, true, SYNC, 0) != null) {
    Thread.interrupted(); // failure possible only due to interrupt
    throw new InterruptedException();
  }
}

/**
 * Transfers the element to a consumer if it is possible to do so
 * before the timeout elapses.
 *
 * <p>More precisely, transfers the specified element immediately
 * if there exists a consumer already waiting to receive it (in
 * {@link #take} or timed {@link #poll(long,TimeUnit) poll}),
 * else inserts the specified element at the tail of this queue
 * and waits until the element is received by a consumer,
 * returning {@code false} if the specified wait time elapses
 * before the element can be transferred.
 *
 * @throws NullPointerException if the specified element is null
 */
public boolean tryTransfer(E e, long timeout, TimeUnit unit)
  throws InterruptedException {
  if (xfer(e, true, TIMED, unit.toNanos(timeout)) == null)
    return true;
  if (!Thread.interrupted())
    return false;
  throw new InterruptedException();
}

/**
 * Inserts the specified element at the tail of this queue.
 * As the queue is unbounded, this method will never block.
 *
 * @throws NullPointerException if the specified element is null
 */
public void put(E e) {
  xfer(e, true, ASYNC, 0);
}

/**
 * Inserts the specified element at the tail of this queue.
 * As the queue is unbounded, this method will never return {@code false}.
 *
 * @return {@code true} (as specified by {@link Queue#offer})
 * @throws NullPointerException if the specified element is null
 */
public boolean offer(E e) {
  xfer(e, true, ASYNC, 0);
  return true;
}

/**
 * Inserts the specified element at the tail of this queue.
 * As the queue is unbounded, this method will never throw
 * {@link IllegalStateException} or return {@code false}.
 *
 * @return {@code true} (as specified by {@link Collection#add})
 * @throws NullPointerException if the specified element is null
 */
public boolean add(E e) {
  xfer(e, true, ASYNC, 0);
  return true;
}

/**
 * Transfers the element to a waiting consumer immediately, if possible.
 *
 * <p>More precisely, transfers the specified element immediately
 * if there exists a consumer already waiting to receive it (in
 * {@link #take} or timed {@link #poll(long,TimeUnit) poll}),
 * otherwise returning {@code false} without enqueuing the element.
 *
 * @throws NullPointerException if the specified element is null
 */
public boolean tryTransfer(E e) {
  return xfer(e, true, NOW, 0) == null;
}

/**
 * Inserts the specified element at the tail of this queue.
 * As the queue is unbounded, this method will never block or
 * return {@code false}.
 *
 * @return {@code true} (as specified by
 *  {@link BlockingQueue#offer(Object,long,TimeUnit) BlockingQueue.offer})
 * @throws NullPointerException if the specified element is null
 */
public boolean offer(E e, long timeout, TimeUnit unit) {
  xfer(e, true, ASYNC, 0);
  return true;
}

public E poll() {
  return xfer(null, false, NOW, 0);
}

public E take() throws InterruptedException {
  E e = xfer(null, false, SYNC, 0);
  if (e != null)
    return e;
  Thread.interrupted();
  throw new InterruptedException();
}

public E poll(long timeout, TimeUnit unit) throws InterruptedException {
  E e = xfer(null, false, TIMED, unit.toNanos(timeout));
  if (e != null || !Thread.interrupted())
    return e;
  throw new InterruptedException();
}

/**
 * Transfers the element to a consumer, waiting if necessary to do so.
 *
 * <p>More precisely, transfers the specified element immediately
 * if there exists a consumer already waiting to receive it (in
 * {@link #take} or timed {@link #poll(long,TimeUnit) poll}),
 * else inserts the specified element at the tail of this queue
 * and waits until the element is received by a consumer.
 *
 * @throws NullPointerException if the specified element is null
 */
public void transfer(E e) throws InterruptedException {
  if (xfer(e, true, SYNC, 0) != null) {
    Thread.interrupted(); // failure possible only due to interrupt
    throw new InterruptedException();
  }
}

/**
 * Transfers the element to a consumer if it is possible to do so
 * before the timeout elapses.
 *
 * <p>More precisely, transfers the specified element immediately
 * if there exists a consumer already waiting to receive it (in
 * {@link #take} or timed {@link #poll(long,TimeUnit) poll}),
 * else inserts the specified element at the tail of this queue
 * and waits until the element is received by a consumer,
 * returning {@code false} if the specified wait time elapses
 * before the element can be transferred.
 *
 * @throws NullPointerException if the specified element is null
 */
public boolean tryTransfer(E e, long timeout, TimeUnit unit)
  throws InterruptedException {
  if (xfer(e, true, TIMED, unit.toNanos(timeout)) == null)
    return true;
  if (!Thread.interrupted())
    return false;
  throw new InterruptedException();
}

Javadoc

Implements all queuing methods. See above for explanation.

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