Examples of jersey.repackaged.jsr166e.StampedLock

jersey.repackaged.jsr166e.StampedLock
xclusively locked method long stamp = sl.writeLock(); try { x += deltaX; y += deltaY; } finally { sl.unlockWrite(stamp); } } double distanceFromOrigin() { // A read-only method long stamp = sl.tryOptimisticRead(); double currentX = x, currentY = y; if (!sl.validate(stamp)) { stamp = sl.readLock(); try { currentX = x; currentY = y; } finally { sl.unlockRead(stamp); } } return Math.sqrt(currentX * currentX + currentY * currentY); } void moveIfAtOrigin(double newX, double newY) { // upgrade // Could instead start with optimistic, not read mode long stamp = sl.readLock(); try { while (x == 0.0 && y == 0.0) { long ws = sl.tryConvertToWriteLock(stamp); if (ws != 0L) { stamp = ws; x = newX; y = newY; break; } else { sl.unlockRead(stamp); stamp = sl.writeLock(); } } } finally { sl.unlock(stamp); } } }} @since 1.8 @author Doug Lea


    // Vector-only methods


    /** See {@link Vector#firstElement} */
    public E firstElement() {
        final StampedLock lock = this.lock;
        long stamp = lock.tryOptimisticRead();
        Object[] items;
        if ((items = array) != null && count > 0 && items.length > 0) {
            @SuppressWarnings("unchecked") E e = (E)items[0];
            if (lock.validate(stamp))
                return e;
        }
        return lockedFirstElement();
    }

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    }


    @SuppressWarnings("unchecked") private E lockedFirstElement() {
        Object e = null;
        boolean oobe = false;
        final StampedLock lock = this.lock;
        long stamp = lock.readLock();
        try {
            Object[] items = array;
            if (items != null && count > 0 && items.length > 0)
                e = items[0];
            else
                oobe = true;
        } finally {
            lock.unlockRead(stamp);
        }
        if (oobe)
            throw new NoSuchElementException();
        return (E) e;
    }

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        return (E) e;
    }


    /** See {@link Vector#lastElement} */
    public E lastElement() {
        final StampedLock lock = this.lock;
        long stamp = lock.tryOptimisticRead();
        Object[] items;
        int i;
        if ((items = array) != null && (i = count - 1) >= 0 &&
            i < items.length) {
            @SuppressWarnings("unchecked") E e = (E)items[i];
            if (lock.validate(stamp))
                return e;
        }
        return lockedLastElement();
    }

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                lock.unlockWrite(stamp);
            }
        }


        public boolean remove(Object o) {
            final StampedLock lock = list.lock;
            long stamp = lock.writeLock();
            try {
                if (list.rawRemoveAt(findFirstIndex(list.array, o, offset,
                                                    offset + size))) {
                    --size;
                    return true;
                }
                else
                    return false;
            } finally {
                lock.unlockWrite(stamp);
            }
        }

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                throw new ArrayIndexOutOfBoundsException(toIndex);
            return new ReadMostlyVectorSublist<E>(list, offset+fromIndex, ssize);
        }


        public Object[] toArray() {
            final StampedLock lock = list.lock;
            long stamp = lock.readLock();
            try {
                return list.internalToArray(offset, offset + size);
            } finally {
                lock.unlockRead(stamp);
            }
        }

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                lock.unlockRead(stamp);
            }
        }


        public <T> T[] toArray(T[] a) {
            final StampedLock lock = list.lock;
            long stamp = lock.readLock();
            try {
                return list.internalToArray(a, offset, offset + size);
            } finally {
                lock.unlockRead(stamp);
            }
        }

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                lock.unlockRead(stamp);
            }
        }


        public String toString() {
            final StampedLock lock = list.lock;
            long stamp = lock.readLock();
            try {
                return list.internalToString(offset, offset + size);
            } finally {
                lock.unlockRead(stamp);
            }
        }

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        int origin;
        int fence;
        int lastRet;


        SubItr(ReadMostlyVectorSublist<E> sublist, int index) {
            final StampedLock lock = sublist.list.lock;
            long stamp = lock.readLock();
            try {
                this.sublist = sublist;
                this.list = sublist.list;
                this.lock = lock;
                this.cursor = index;
                this.origin = sublist.offset;
                this.fence = origin + sublist.size;
                this.lastRet = -1;
            } finally {
                this.seq = lock.tryConvertToOptimisticRead(stamp);
            }
            if (index < 0 || cursor > fence)
                throw new ArrayIndexOutOfBoundsException(index);
        }

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    }


    @SuppressWarnings("unchecked") private E lockedLastElement() {
        Object e = null;
        boolean oobe = false;
        final StampedLock lock = this.lock;
        long stamp = lock.readLock();
        try {
            Object[] items = array;
            int i = count - 1;
            if (items != null && i >= 0 && i < items.length)
                e = items[i];
            else
                oobe = true;
        } finally {
            lock.unlockRead(stamp);
        }
        if (oobe)
            throw new NoSuchElementException();
        return (E) e;
    }

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    /** See {@link Vector#indexOf(Object, int)} */
    public int indexOf(Object o, int index) {
        if (index < 0)
            throw new ArrayIndexOutOfBoundsException(index);
        int idx;
        final StampedLock lock = this.lock;
        long stamp = lock.readLock();
        try {
            idx = findFirstIndex(array, o, index, count);
        } finally {
            lock.unlockRead(stamp);
        }
        return idx;
    }

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Related Classes of jersey.repackaged.jsr166e.StampedLock

jersey.repackaged.jsr166e.extra.ReadMostlyVector

jersey.repackaged.jsr166e.extra.ReadMostlyVector$Itr

jersey.repackaged.jsr166e.extra.ReadMostlyVector$ReadMostlyVectorSublist

jersey.repackaged.jsr166e.extra.ReadMostlyVector$SubItr

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