DistributedLock Issues : Interrupt thread after get lock, CountDownLatch is not reset while lock at the next time

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Interrupt thread after get lock, CountDownLatch is not reset while lock at the next time

reset CountDownLatch at method prepare(), code :
private synchronized void prepare() { ...... syncPoint = new CountDownLatch(1); }

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Interrupt thread after get lock, the field currentNode is null, cleanup will throw NullPointException

Allow it to be null, code :
private void cleanup() { if(currentNode != null) { //delete currentNode.... } ...... }