executorservice

问题 I'm wondering can I get the result when it cause timeout Exception when use Future and ExecutorService, for example, below is my code package com.example; import java.util.UUID; import java.util.concurrent.ExecutorService; import java.util.concurrent.Future; import java.util.concurrent.LinkedBlockingQueue; import java.util.concurrent.ThreadPoolExecutor; import java.util.concurrent.TimeUnit; import java.util.concurrent.TimeoutException; import org.apache.commons.lang3.concurrent

问题 I'm wondering can I get the result when it cause timeout Exception when use Future and ExecutorService, for example, below is my code package com.example; import java.util.UUID; import java.util.concurrent.ExecutorService; import java.util.concurrent.Future; import java.util.concurrent.LinkedBlockingQueue; import java.util.concurrent.ThreadPoolExecutor; import java.util.concurrent.TimeUnit; import java.util.concurrent.TimeoutException; import org.apache.commons.lang3.concurrent

问题 I am working on a program that will read data from a data source, and publish that data as it is read. I have a reader and a writer, the reader spawns several threads to read all the data it needs to read, puts the data into a queue, and the writer reads the data from the queue an publishes it. I have a controller for my readers and a controller for my writers. The controllers implement the Callable interface, but could implement the Runnable interface as my call return is Void . I want to

问题 I am working on a program that will read data from a data source, and publish that data as it is read. I have a reader and a writer, the reader spawns several threads to read all the data it needs to read, puts the data into a queue, and the writer reads the data from the queue an publishes it. I have a controller for my readers and a controller for my writers. The controllers implement the Callable interface, but could implement the Runnable interface as my call return is Void . I want to

问题 I know that shutdown() and awaitTermination() exist. The problem is that the runnables in the pool need to be able to add an unknown number (can't use a countdownlatch) of other runnables to it and if I call shutdown() those tasks will be rejected. How can I know when they're done? 回答1: Instead of submitting Runnable tasks to an Executor , you should rather use ForkJoinTask/ForkJoinPool instead. A ForkJoinTask runs inside a ForkJoinPool and can spawn an arbitrary number of (sub)tasks and wait

问题 I have multiple runnable classes and I want to run them with executor service through a centralized class (call it Launcher class which contains list of all runnables). I wrote a Launcher class which takes all the beans to instantiate using applicationContext.getBean() . Each runnable class also defines a pool size for it (number of threads to spawn for this runnable). public class DaemonsLauncher { @Autowired private ApplicationContext appContext; private List<Daemon> daemons = new ArrayList

问题 I have multiple runnable classes and I want to run them with executor service through a centralized class (call it Launcher class which contains list of all runnables). I wrote a Launcher class which takes all the beans to instantiate using applicationContext.getBean() . Each runnable class also defines a pool size for it (number of threads to spawn for this runnable). public class DaemonsLauncher { @Autowired private ApplicationContext appContext; private List<Daemon> daemons = new ArrayList

问题 I have multiple runnable classes and I want to run them with executor service through a centralized class (call it Launcher class which contains list of all runnables). I wrote a Launcher class which takes all the beans to instantiate using applicationContext.getBean() . Each runnable class also defines a pool size for it (number of threads to spawn for this runnable). public class DaemonsLauncher { @Autowired private ApplicationContext appContext; private List<Daemon> daemons = new ArrayList

问题 I'm trying to implement a sample application to test Callable and ExecutorService interfaces. In my app I have: @Bean("fixedThreadPool") public ExecutorService fixedThreadPool() { return Executors.newFixedThreadPool(5); } Then: public void removeUserIds(Set<String> userIds) { UriComponentsBuilder builder = UriComponentsBuilder.fromUriString("http://localhost:8080/remove"); final List<Callable<String>> callables = new ArrayList<>(); userIds.forEach(userId -> { final Callable<String> task = ()

问题 I have a bunch of runnables that I want to execute via a thread pool. However, each runnable also writes some result to some file. So right now, the runnable's interface is simple: class MyRunnable implements Runnable { ... MyRunnable(BufferedWriter writer, Task t) { this.writer = writer; this.task = t; } public void run() { ... this.writer.write(SOME_DATA); } } However, what I want is to associate one BufferedWriter (in other words, one output file) with each of the thread in the Executor