BlockingQueue methods and implemetation

BlockingQueue

BlockingQueue is a Queue which supports flow control by introducing blocking (while underflow or overflow) along with storing the elements.

take() method of BlockingQueue will block if Queue is empty and thread trying to dequeue from an empty queue is blocked until some other thread inserts an item into the queue.

put() method of BlockingQueue will block if Queue is full and thread trying to enqueue an item in a full queue is blocked until some other thread makes space in the queue.

BlockingQueue

Implementation of BlockingQueue interface in java.util.concurrent package:

ArrayBlockingQueue

DelayQueue

LinkedBlockingDeque

LinkedBlockingQueue

PriorityBlockingQueue

SynchronousQueue

Operations of Blocking Queue

	Throws exception	Special value	Blocks	Times out
Insert	add(e)	offer(e)	put(e)	offer(e, time, unit)
Remove	remove()	poll()	take()	poll(time, unit)
Examine	element()	peek()	not applicable	not applicable
Conditions	Queue is empty while removing, or Queue is full while adding element.	null or false	Block the thread until the operation can be accomplished.	Block the thread for a given maximum time limit before giving up.