Saturday, December 27, 2014

CompletionService.java - initial phrasebook

producer/consumer - upgraded.

buffer - as explained elsewhere in my blog, there's buffer in any async design. In the ExecutorCompletionService scenario, the buffer is the "completion queue". In the classic producer/consumer scenario, buffer is the item queue.

items = "tasks" - In P/C setup, Thread 1 could be producing "items" and Thread 2 could be taking up the items off the buffer and using them. In the important special case of task items, the consumer thread
(possibly worker thread) would pick up the task from queue and execute them. CompletionService is all about task items.

tasks executed by..? - in P/C with task queue, tasks are executed by consumer. In CompletionService, tasks are executed by the mysterious "Service", not consumer. See CompletionService javadoc.

3-party - 1 more than P/C. Beside the P and C threads, the task executor could run on another thread.

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