The use of multithreading in programming

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Examples of ptn multithreading usage:

In the ptn project, due to the large amount of tunnel data captured by the network management system, each tunnel needs to be processed relative to the business. In the traditional for cycle, each tunnel is executed in turn, which is very slow.

Now the large tunnerl list is divided into n list, and each list is a thread to improve efficiency.

Details are as follows:

Jdk comes with thread pool result manager: ExecutorCompletionService, which encapsulates BlockingQueue and Executor. Then use the ExecutorCompletionService.submit () method to submit the task.

1. Create a new thread pool

ExecutorService exs = Executors.newFixedThreadPool (analysisThreadNum)

two。 Thread pool manager, which can obtain multithreaded processing results

CompletionService completionService = new ExecutorCompletionService (exs)

3. Split a list into multiple list equally divided into tunnullist

List averageAssign = CommUtils.averageAssign (tunnels, analysisThreadNum)

4. Traversing averageAssign and averaging list

List futureList = new ArrayList ()

For (List list: averageAssign) {

FutureList.add (completionService.submit (new LogicPathOverlappedCheckTask (list, portNameLinkIdMap,tunnelClassifyMap, allNEs, allBoards, allTopoLines))

}

5. Merge multithreaded results

For (int I = 1, curr = 0, length = futureList.size (); I