executorservice

I implemented the Spring-TaskExecutor (which is the equivalent of the JDK 1.5's Executor.) to process notifications notifications receiving from external systems. Interface with only one method: public interface AsynchronousService { void executeAsynchronously(Runnable task); } and the corresponding implementation: public class AsynchronousServiceImpl implements AsynchronousService { private Executor taskExecutor; @Override public void executeAsynchronously(Runnable task) { taskExecutor.execute(task); } @Required public void setTaskExecutor(Executor taskExecutor) { this.taskExecutor =

这个博客介绍的不错： http://my.oschina.net/jielucky/blog/157946 http://my.oschina.net/adwangxiao/blog/110188 我再顺着这个博客往下写： 赛马是个不错的多线程场景，包括所有赛马都准备好，然后指挥官喊预备跑部分，然后所有赛马跑到了，关闭所有跑道两部分，这个场景可以很好的运用多线程。如下图所示. package com.xue.gang.barrier; import java.util.concurrent.BrokenBarrierException; import java.util.concurrent.CountDownLatch; import java.util.concurrent.CyclicBarrier; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; public class CyclicBarrierMutiRunner { public static void main(String args[]) throws InterruptedException{ final int size = 10; ExecutorService

I have a simple web service running inside a Tomcat container, which by nature is multi-threaded. In each request that comes into the service, I want to make concurrent calls to an external service. The ExecutorCompletionService in java.util.concurrent gets me partly there. I can provide it a thread pool, and it will take care of executing my concurrent calls and I will be notified when any of the results are ready. The code to process a particular incoming request might look like: void handleRequest(Integer[] input) { // Submit tasks CompletionService<Integer> completionService = new

I'm doing a POC on Bulk write (around 5.5k items) in local Dynamo DB using DynamoDB SDK for Java. I'm aware that each bulk write cannot have more than 25 write operations, so I am dividing the whole dataset into chunks of 25 items each. Then I'm passing these chunks as callable actions in Executor framework. Still, I'm not having a satisfactory result as the 5.5k records are getting inserted in more than 100 seconds. I'm not sure how else can I optimize this. While creating the table I provisioned the WriteCapacityUnit as 400(not sure what's the maximum value I can give) and experimented with

This question already has an answer here: Executors.newCachedThreadPool() versus Executors.newFixedThreadPool() 8 answers In case newCachedThreadPool() as per creates a thread pool that creates new threads as needed, but will reuse previously constructed threads when they are available whereas in case of newFixedThreadPool(int size) specify size to create the thread pool with size specified. Why isn't newFixedThreadPool(int size) implemented in newCachedThreadPool() fashion where thread pool creates the new thread only when required and will limit the thread to size? Any clarrification on the