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Copy pathParallelMain3.java
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54 lines (42 loc) · 1.59 KB
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package parallel;
import java.util.concurrent.*;
import static util.MyLogger.*;
public class ParallelMain3 {
public static void main(String[] args) throws InterruptedException, ExecutionException {
// 스레드 풀을 준비한다.
ExecutorService es = Executors.newFixedThreadPool(2);
long startTime = System.currentTimeMillis();
// 1. Fork 작업을 분할한다.
SumTask task1 = new SumTask(1,4);
SumTask task2 = new SumTask(5,8);
// 2. 분할한 작업을 처리한다.
Future<Integer> future1 = es.submit(task1);
Future<Integer> future2 = es.submit(task2);
// 3. Join - 처리한 결과를 합친다. get: 결과가 나올 떄 가지 대기한다.
Integer result1 = future1.get();
Integer result2 = future2.get();
int sum = result1 + result2;
long endTime = System.currentTimeMillis();
log("time : " + (endTime - startTime) + "ms, sum : " + sum);
es.shutdown();
}
static class SumTask implements Callable<Integer> {
int startValue;
int endValue;
public SumTask(int startValue, int endValue) {
this.startValue = startValue;
this.endValue = endValue;
}
@Override
public Integer call() {
log("작업 시작");
int sum = 0;
for (int i = startValue; i <= endValue; i++) {
int calculated = HeavyJob.headvyTask(i);
sum += calculated;
}
log("작업 완료 result= "+sum);
return sum;
}
}
}