jdk1.8练习201909200843By:镜花水月(月神)

package org.jimmy.test2019091701;

import java.util.Arrays;
import java.util.List;
import java.util.Set;
import java.util.concurrent.Callable;
import java.util.concurrent.CompletionService;
import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorCompletionService;
import java.util.concurrent.Executors;
import java.util.stream.Collectors;
import java.util.stream.Stream;

/**
 * @author YueShen
 * @date 2019年9月17日 下午5:48:33
 * @detail
 */
public class Test {

    public static Executor executor = Executors.newFixedThreadPool(30);

    public static <T>List<T> forkJoin(List<Callable<T>> list){
        CompletionService<T> service = new ExecutorCompletionService<T>(executor);
        list.forEach(service::submit);
        return Stream.generate(() -> 1).limit(list.size()).map(x -> {
            try{
                return service.take().get();
            }catch(Exception e){

            }
            return null;
        }).collect(Collectors.toList());
    }

    public static <T>List<T> forkJoin(Callable<T>... callables){
        return forkJoin(Arrays.asList(callables));
    }

    public static <T>Set<T> test(){
        return null;
    }

    public static void main(String[] args) {
        List<Integer> numList = forkJoin(() -> -2, () -> -1,
            () -> 0,
             () -> -1
        );
        System.out.println(numList);
        numList = forkJoin(() -> 1 + 1, () -> 2 + 2);
        System.out.println(numList);
    }

}