executorservice

问题 I Used ExecutorService that interrupts tasks after a timeout.I use a ScheduledExecutorService for this. First I submitted the thread and it once to begin immediately and retain the future that is created. After that i use ScheduledExecutorService as a new task that would cancel the retained future after some period of time. //Start Spring executor to submit tasks ThreadPoolTaskExecutor taskExecutor = (ThreadPoolTaskExecutor) ApplicationContextProvider.getApplicationContext().getBean(

问题 I have a sample java code below which if run as a console application behaves as I expected ( spawning a single thread to execute the runnable). The strange behavior (spawning two threads - sample below) I see is when I run this sample as a service application using Apache's prunsrv64.exe. I am testing this on a Windows 7 machine - 64bit. Sample Output: Thread -28 Current time: 09:50:11 AM Thread -52 Current time: 09:50:12 AM Thread -28 Current time: 09:50:21 AM Thread -52 Current time: 09:50

问题 Sorry I have to open a new thread to describe this problem. This morning I asked this question, there're some replies but my problem is still not solved. This time I will attach some runnable code(simplified but with the same problem) for you to reproduce the problem: public class ThreadPoolTest { public static void main(String[] args) throws Exception { final ExecutorService taskExecutor = Executors.newFixedThreadPool(5); Future<Void> futures[] = new Future[5]; for (int i = 0; i < futures

问题 I put a bunch of runnable objects into an ExecutorService: // simplified content of main method ExecutorService threadPool = Executors.newCachedThreadPool(); for(int i = 0; i < workerCount; i++) { threadPool.execute(new Worker()); } I would expect my program/process to stop immediately after all workers are done. But according to my log, it takes another 20-30 seconds until that happens. The workers do not allocate any resources, in fact, they do nothing at the moment. Don't get me wrong,

问题 I have code which needs to do something like this There is a list of classes each with some method (lets say execute()). I need to invoke that method on each class and there is a fixed timeOut for each invocation. Now, one of the class's execute method is badly written and results in a timeout due to which the jvm does not exit. I am running the class like this. java ExecutorServiceTest execute TestClass1 TestClass2 TestClass3 Why does the jvm not exit after completing the execution of the

问题 I want to perform a search using iterative deepening, meaning every time I do it, I go deeper and it takes longer. There is a time limit (2 seconds) to get the best result possible. From what I've researched, the best way to do this is using an ExecutorService, a Future and interrupting it when the time runs out. This is what I have at the moment: In my main function: ExecutorService service = Executors.newSingleThreadExecutor(); ab = new AB(); Future<Integer> f = service.submit(ab); Integer

问题 Is their a way to schedule a thread pool using ExecutorService , in lines similar to thread.sleep() My current code looks something like Executors.newScheduledThreadPool(poolSize); public void run() { try { pool.execute(new Worker()); } But I want to call the run method, only after some time interval. Can someone let me know how to do this? 回答1: This can be achieved using ScheduledThreadPoolExecutor. Sample code pool = new ScheduledThreadPoolExecutor(10); pool.scheduleWithFixedDelay(new

问题 I am working on a project in which I have multiple interface and two Implementations classes which needs to implement these two interfaces. Suppose my first Interface is - public Interface interfaceA { public String abc() throws Exception; } And its implementation is - public class TestA implements interfaceA { // abc method } I am calling it like this - TestA testA = new TestA(); testA.abc(); Now my second interface is - public Interface interfaceB { public String xyz() throws Exception; }

问题 I am using ScheduledExecutorService to run scheduled threads. I implemented ServletContextListener.contextDestroyed and invoked ScheduledExecutorService.shutdownNow and awaitTermination . Here is an example: @Override public void contextDestroyed(ServletContextEvent servletcontextevent) { pool.shutdownNow(); // Disable new tasks from being submitted try { // Wait a while for existing tasks to terminate if (!pool.awaitTermination(50, TimeUnit.SECONDS)) { pool.shutdownNow(); // Cancel currently

问题 Given Executor service with a fixed pool of threads, is it possible to guarantee deterministic assignment of tasks to threads? More precisely, assume there are just two threads, namely pool-thread-0 and pool-thread-1 and there is a collection of 2 tasks to be executed. What I wish to achieve is that the former thread always executes the first one, while the latter handles the remaining one. Here is an example: public static void main(String[] args) throws InterruptedException,