sp; newd = new Descriptor<E>(desc.size - 1, null);
} while (!descriptor.compareAndSet(desc, newd));
return elem;
}
/**
* Get element with the index.
*
* @param index
* index
* @return element with the index
*/
@Override
public E get(int index) {
int pos = index + FIRST_BUCKET_SIZE;
int zeroNumPos = Integer.numberOfLeadingZeros(pos);
int bucketInd = zeroNumFirst - zeroNumPos;
int idx = (0x80000000>>>zeroNumPos) ^ pos;
return buckets.get(bucketInd).get(idx);
}
/**
* Set the element with index to e.
*
* @param index
* index of element to be reset
* @param e
* element to set
*/
/**
* {@inheritDoc}
*/
public E set(int index, E e) {
int pos = index + FIRST_BUCKET_SIZE;
int bucketInd = Integer.numberOfLeadingZeros(FIRST_BUCKET_SIZE)
- Integer.numberOfLeadingZeros(pos);
int idx = Integer.highestOneBit(pos) ^ pos;
AtomicReferenceArray<E> bucket = buckets.get(bucketInd);
while (true) {
E oldV = bucket.get(idx);
if (bucket.compareAndSet(idx, oldV, e))
return oldV;
}
}
/**
* reserve more space.
*
* @param newSize
* new size be reserved
*/
public void reserve(int newSize) {
int size = descriptor.get().size;
int pos = size + FIRST_BUCKET_SIZE - 1;
int i = Integer.numberOfLeadingZeros(FIRST_BUCKET_SIZE)
- Integer.numberOfLeadingZeros(pos);
if (i < 1)
i = 1;
int initialSize = buckets.get(i - 1).length();
while (i < Integer.numberOfLeadingZeros(FIRST_BUCKET_SIZE)
- Integer.numberOfLeadingZeros(newSize + FIRST_BUCKET_SIZE - 1)) {
i++;
initialSize *= FIRST_BUCKET_SIZE;
buckets.compareAndSet(i, null, new AtomicReferenceArray<E>(
initialSize));
}
}
/**
* size of vector.
*
* @return size of vector
*/
public int size() {