com.oracle.truffle.runtime.collection.DelegatingBlockingQueue Maven / Gradle / Ivy
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package com.oracle.truffle.runtime.collection;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.ReentrantLock;
public final class DelegatingBlockingQueue implements BlockingQueue {
private final ReentrantLock lock;
private final Condition notEmpty;
private final SerialQueue delegate;
public DelegatingBlockingQueue(SerialQueue delegate) {
this.lock = new ReentrantLock();
this.notEmpty = this.lock.newCondition();
this.delegate = delegate;
}
@Override
public boolean add(E x) {
lock.lock();
try {
final boolean wasEmpty = isEmpty();
delegate.add(x);
if (wasEmpty) {
notEmpty.signalAll();
}
return true;
} finally {
lock.unlock();
}
}
public int addIndexOf(E x) {
lock.lock();
try {
final boolean wasEmpty = isEmpty();
final int index = delegate.addIndexOf(x);
if (wasEmpty) {
notEmpty.signalAll();
}
return index;
} finally {
lock.unlock();
}
}
public int indexOf(E x) {
lock.lock();
try {
return delegate.indexOf(x);
} finally {
lock.unlock();
}
}
@Override
public boolean offer(E x) {
return add(x);
}
@Override
public void put(E x) throws InterruptedException {
add(x);
}
@Override
public boolean offer(E x, long l, TimeUnit unit) throws InterruptedException {
return add(x);
}
@SuppressWarnings("unchecked")
private E lockedPoll() {
return delegate.poll();
}
@Override
public E poll() {
lock.lock();
try {
return lockedPoll();
} finally {
lock.unlock();
}
}
@Override
public E poll(long timeout, TimeUnit unit) throws InterruptedException {
long nanos = unit.toNanos(timeout);
final ReentrantLock localLock = this.lock;
localLock.lockInterruptibly();
E result;
try {
while ((result = lockedPoll()) == null && nanos > 0) {
nanos = notEmpty.awaitNanos(nanos);
}
} finally {
localLock.unlock();
}
return result;
}
@Override
public E remove() {
lock.lock();
try {
final E result = lockedPoll();
if (result == null) {
throw new NoSuchElementException();
}
return result;
} finally {
lock.unlock();
}
}
@Override
public boolean remove(Object o) {
throw new UnsupportedOperationException();
}
@SuppressWarnings("unchecked")
@Override
public E peek() {
lock.lock();
try {
return delegate.peek();
} finally {
lock.unlock();
}
}
@Override
public E element() {
final E result = peek();
if (result == null) {
throw new NoSuchElementException();
}
return result;
}
@Override
public E take() throws InterruptedException {
lock.lockInterruptibly();
E result;
try {
while ((result = lockedPoll()) == null) {
notEmpty.await();
}
} finally {
lock.unlock();
}
return result;
}
@Override
public int remainingCapacity() {
return Integer.MAX_VALUE;
}
@Override
public boolean containsAll(Collection collection) {
throw new UnsupportedOperationException();
}
@Override
public boolean addAll(Collection collection) {
throw new UnsupportedOperationException();
}
@Override
public boolean removeAll(Collection collection) {
throw new UnsupportedOperationException();
}
@Override
public boolean retainAll(Collection collection) {
throw new UnsupportedOperationException();
}
@Override
public void clear() {
lock.lock();
try {
delegate.clear();
// Note: no need to awake waiting threads, because no item was added.
} finally {
lock.unlock();
}
}
@Override
public int size() {
lock.lock();
try {
return delegate.size();
} finally {
lock.unlock();
}
}
@Override
public boolean isEmpty() {
return size() == 0;
}
@Override
public boolean contains(Object o) {
throw new UnsupportedOperationException();
}
@SuppressWarnings("unchecked")
@Override
public Iterator iterator() {
final Object[] result = toArray();
return (Iterator) Arrays.asList(result).iterator();
}
@Override
public Object[] toArray() {
lock.lock();
try {
return delegate.toArray();
} finally {
lock.unlock();
}
}
@Override
public T[] toArray(T[] a) {
lock.lock();
try {
return delegate.toArray(a);
} finally {
lock.unlock();
}
}
@Override
public int drainTo(Collection collection) {
int count = 0;
final Iterator iterator = iterator();
while (iterator.hasNext()) {
collection.add(iterator.next());
count++;
}
return count;
}
@Override
public int drainTo(Collection collection, int i) {
throw new UnsupportedOperationException();
}
public int internalCapacity() {
lock.lock();
try {
return delegate.internalCapacity();
} finally {
lock.unlock();
}
}
}
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