/** @throws GridException If operation failed. */
private void initializeLatch() throws GridException {
if (initGuard.compareAndSet(false, true)) {
try {
internalLatch =
CU.outTx(
new Callable<CountDownLatch>() {
@Override
public CountDownLatch call() throws Exception {
GridCacheTx tx =
CU.txStartInternal(ctx, latchView, PESSIMISTIC, REPEATABLE_READ);
try {
GridCacheCountDownLatchValue val = latchView.get(key);
if (val == null) {
if (log.isDebugEnabled())
log.debug("Failed to find count down latch with given name: " + name);
assert cnt == 0;
return new CountDownLatch(cnt);
}
tx.commit();
return new CountDownLatch(val.get());
} finally {
tx.end();
}
}
},
ctx);
if (log.isDebugEnabled()) log.debug("Initialized internal latch: " + internalLatch);
} finally {
initLatch.countDown();
}
} else {
try {
initLatch.await();
} catch (InterruptedException ignored) {
throw new GridException("Thread has been interrupted.");
}
if (internalLatch == null)
throw new GridException("Internal latch has not been properly initialized.");
}
}
/**
* Synchronous sequence update operation. Will add given amount to the sequence value.
*
* @param l Increment amount.
* @param updateCall Cache call that will update sequence reservation count in accordance with l.
* @param updated If {@code true}, will return sequence value after update, otherwise will return
* sequence value prior to update.
* @return Sequence value.
* @throws GridException If update failed.
*/
private long internalUpdate(long l, @Nullable Callable<Long> updateCall, boolean updated)
throws GridException {
checkRemoved();
assert l > 0;
lock.lock();
try {
// If reserved range isn't exhausted.
if (locVal + l <= upBound) {
long curVal = locVal;
locVal += l;
return updated ? locVal : curVal;
}
} finally {
lock.unlock();
}
if (updateCall == null) updateCall = internalUpdate(l, updated);
while (true) {
if (updateGuard.compareAndSet(false, true)) {
try {
// This call must be outside lock.
return CU.outTx(updateCall, ctx);
} finally {
lock.lock();
try {
updateGuard.set(false);
cond.signalAll();
} finally {
lock.unlock();
}
}
} else {
lock.lock();
try {
while (locVal >= upBound && updateGuard.get()) {
try {
cond.await(500, MILLISECONDS);
} catch (InterruptedException e) {
throw new GridInterruptedException(e);
}
}
checkRemoved();
// If reserved range isn't exhausted.
if (locVal + l <= upBound) {
long curVal = locVal;
locVal += l;
return updated ? locVal : curVal;
}
} finally {
lock.unlock();
}
}
}
}
/** {@inheritDoc} */
@Override
public int countDown(int val) throws GridException {
A.ensure(val > 0, "val should be positive");
return CU.outTx(new CountDownCallable(val), ctx);
}
/** {@inheritDoc} */
@Override
public void countDownAll() throws GridException {
CU.outTx(new CountDownCallable(0), ctx);
}
/** {@inheritDoc} */
@Override
public int countDown() throws GridException {
return CU.outTx(new CountDownCallable(1), ctx);
}