![]() ![]() I know that this is an old topic but I saw that you didnt consider a concurrent implementation of a priority queue. Like the example of a PriorityQueue, the calling code could be agnostic to this, though as you may want to use some sort of wait timeout that's not always case. With a BlockingQueue you're typically in the realm of worker threads picking up queued work and when there's no work to do, those threads can be blocked until work becomes available. While priority queues are often implemented with heaps, they are. That said typically the code processing the jobs should be agnostic to the order. If two elements have the same priority, they are served according to their order in the queue. For example on a queue of jobs, you might want to be able to give those jobs priority. There's numerous reasons why you might need a PriorityQueue that boil down to message ordering. Heaps are binary trees for which every parent node has a value less than or equal to any of its children. If your code requires knowledge of both these concepts a re-think may be needed. This module provides an implementation of the heap queue algorithm, also known as the priority queue algorithm. Typically you could should depend on the abstract type, either PriorityQueue or BlockingQueue. The priority part in the queues you are using simply means the items are read from the queue in a specific order (either natural if they implement Comparable or according to a Comparator). The maximum number of children of a node in the heap. Let’s say if X is a parent node of Y, then the value of X follows some specific order with respect to value of Y and the same order will be followed across the tree. ("Added an element to the queue") Ī normal Queue will return null when accessed if it is empty, while a BlockingQueue blocks if the queue is empty until a value is available. Heaps: A heap is a specific tree based data structure in which all the nodes of tree are in a specific order. ![]() (priorityQueue.remove() +" is removed from priorityQueue object") Public class PriorityBlockingQueueExample Which one should I choose over another among these programs and why? Generally the question is why should I choose to use PriorityBlockingQueue over PriorityQueue. ![]()
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