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您好我想運行下面的代碼,並且在執行器被終止後,我期待剩餘任務的計數爲0,但由於某種原因,當它滿足以下條件時它超過100。執行器沒有完成所有的任務
while(executor.isTerminated()) {
System.out.println("Total Task Remaining : " + ExecutorServiceExample.task.size());
System.out.println("*** Executor Terminated ***");
break;
}
Code Snippet。
package test;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
public class ExecutorServiceExample {
public static volatile Set<String> task = new HashSet<String>();
public static void main(String args[]) {
ExecutorService executor = Executors.newFixedThreadPool(2000);
for (int i = 0; i < 10000; i++) {
String name = "task#" + i;
task.add(name);
Runnable runner = new TaskPrint(name);
executor.execute(runner);
}
try {
executor.shutdown();
executor.awaitTermination(Long.MAX_VALUE, TimeUnit.MILLISECONDS);
if (executor.isTerminated()) {
System.out.println("Total Task Remaining : " + ExecutorServiceExample.task.size());
System.out.println("*** Executor Terminated ***");
}
} catch (InterruptedException ignored) {
}
}
}
class TaskPrint implements Runnable {
private final String name;
public TaskPrint(String name) {
this.name = name;
}
public void run() {
ExecutorServiceExample.task.remove(name);
}
}
基於任務數量的結果有些奇怪。
100個任務的輸出。
Total Task Remaining : 0
*** Executor Terminated ***
1000個任務的輸出。
Total Task Remaining : 0
*** Executor Terminated ***
10000個任務的輸出。
Total Task Remaining : -27
*** Executor Terminated ***
100000個任務的輸出。
Total Task Remaining : 1205
*** Executor Terminated ***
一個synchronizedSet我不知道,但我知道,創建2個數千個線程與'Executors.newFixedThreadPool(2000年);'是自找麻煩... –
我不知道爲什麼因爲HashSet不同步... –
@ G.Demecki我將它改爲'ExecutorService executor = Executors.newFixedThreadPool(10);'現在剩餘的總任務多於2000 –