Continuing our series of articles concerning proposed practices while working with the Java programming language, we are going to perform a performance comparison between four popular Queue implementation classes with relevant semantics. To make things more realistic we are going to test against a multi–threading environment so as to discuss and demonstrate how to utilize ArrayBlockingQueue, ConcurrentLinkedQueue, LinkedBlockingQueue and/or LinkedList for high performance applications.
Last but not least we are going to provide our own implementation of a ConcurrentHashMap. The ConcurrentLinkedHashMap implementation differs from ConcurrentHashMap in that it maintains a doubly–linked list running through all of its entries. This linked list defines the iteration ordering, which is normally the order in which keys were inserted into the map. The ConcurrentLinkedHashMap benefits from the combined characteristics of ConcurrentHashMap and LinkedHashMap achieving performance just slightly below that of ConcurrentHashMap due to the added expense of maintaining the linked list.
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