Java ThreadPoolTaskExecutor抛出RejectedExecutionException
我希望实现以下行为:Java ThreadPoolTaskExecutor抛出RejectedExecutionException,java,spring,spring-boot,java.util.concurrent,completable-future,Java,Spring,Spring Boot,Java.util.concurrent,Completable Future,我希望实现以下行为: 从文件中读取n个事件 在线程中处理它们 如果仍有任何事件,请返回步骤1 我编写了以下应用程序来测试解决方案,但它在随机时刻失败了,例如 java.lang.IllegalStateException: Failed to execute CommandLineRunner Caused by: org.springframework.core.task.TaskRejectedException: Executor [java.util.concurrent.ThreadP
java.lang.IllegalStateException: Failed to execute CommandLineRunner
Caused by: org.springframework.core.task.TaskRejectedException: Executor [java.util.concurrent.ThreadPoolExecutor@62b3df3a[Running, pool size = 5, active threads = 4, queued tasks = 0, completed tasks = 70]] did not accept task: java.util.concurrent.CompletableFuture$AsyncSupply@71ea1fda
如果我不想将事件放入队列,我应该设置什么队列容量?我想马上处理它们
我使用的是OpenJDK11和SpringBoot2.2.2.0版本
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.stream.Collectors;
@SpringBootApplication
public class DemoApplication implements CommandLineRunner {
@Autowired
private ThreadPoolTaskExecutor eventExecutor;
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
@Bean(name = "eventExecutor")
public ThreadPoolTaskExecutor eventExecutor() {
ThreadPoolTaskExecutor pool = new ThreadPoolTaskExecutor();
pool.setCorePoolSize(5);
pool.setMaxPoolSize(5);
pool.setQueueCapacity(0);
pool.setAwaitTerminationSeconds(0);
pool.initialize();
return pool;
}
@Override
public void run(String... args) {
System.out.println("Start events processing");
long start = System.currentTimeMillis();
int result = 0;
for (int i = 0; i < 100; i++) {
List<CompletableFuture<Integer>> completableFutures = getEvents(5).stream()
.map(event -> CompletableFuture.supplyAsync(() -> processEvent(event), eventExecutor))
.collect(Collectors.toList());
result += completableFutures.stream()
.mapToInt(CompletableFuture::join)
.sum();
}
long timeMillis = System.currentTimeMillis() - start;
System.out.println("Took " + timeMillis + "ms, " + result);
}
private List<Event> getEvents(int n) {
List<Event> events = new ArrayList<>();
for (int i = 1; i <= n; i++) {
events.add(new Event(i));
}
return events;
}
private int processEvent(Event event) {
System.out.println("processing event " + event.id);
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("processing event " + event.id + " finished");
return 1;
}
private static class Event {
private int id;
private Event(int id) {
this.id = id;
}
}
}
import org.springframework.beans.factory.annotation.Autowired;
导入org.springframework.boot.CommandLineRunner;
导入org.springframework.boot.SpringApplication;
导入org.springframework.boot.autoconfigure.springboot应用程序;
导入org.springframework.context.annotation.Bean;
导入org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
导入java.util.ArrayList;
导入java.util.List;
导入java.util.concurrent.CompletableFuture;
导入java.util.stream.collector;
@SpringBoot应用程序
公共类DemoApplication实现CommandLineRunner{
@自动连线
私有线程池任务执行器事件执行器;
公共静态void main(字符串[]args){
run(DemoApplication.class,args);
}
@Bean(name=“eventExecutor”)
公共线程池TaskExecutor eventExecutor(){
ThreadPoolTaskExecutor池=新的ThreadPoolTaskExecutor();
池。setCorePoolSize(5);
pool.setMaxPoolSize(5);
池。设置队列容量(0);
pool.SetWaitingTerminationSeconds(0);
pool.initialize();
回流池;
}
@凌驾
公共无效运行(字符串…参数){
System.out.println(“启动事件处理”);
长启动=System.currentTimeMillis();
int结果=0;
对于(int i=0;i<100;i++){
List completableFutures=getEvents(5).stream()
.map(事件->CompletableFuture.SupplySync(()->processEvent(事件),eventExecutor))
.collect(Collectors.toList());
结果+=completableFutures.stream()
.mapToInt(CompletableFuture::join)
.sum();
}
long-timeMillis=System.currentTimeMillis()-开始;
System.out.println(“take”+timeMillis+“ms”+result);
}
私有列表getEvents(int n){
列表事件=新建ArrayList();
对于(int i=1;i我建议将pool.setQueueCapacity(0)
更改为使用正值,以便在如此配置的固定大小池(corePoolSize==maxPoolSize==5)中没有可用线程时,允许任务排队处理
输出“pool size=5,active threads=4”显示了线程的大致数量
从理论上讲,在尝试处理新的一批事件之前,线程可能不会返回到池中。您可能需要池中的更多线程来处理每个线程的每个任务,而不排队,或者增加队列大小,以便在线程忙时任务可以排队