Java异步编程之Future

package com.pingan.fic.trade.thread;

import com.alibaba.fastjson.JSONObject;
import org.junit.Test;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.*;

/**
 * ExecutorServiceTest
 * Created by MAKUN649 on 2017/2/15.
 */
public class ExecutorServiceTest {

    ExecutorService executorService = Executors.newFixedThreadPool(3);

    final String request1 = "request1";
    final String request2 = "request2";
    final String request3 = "request3";


    @Test
    public void testFutureTask() throws InterruptedException, ExecutionException {

        FutureTask futureTask1 = new FutureTask<>(new Callable() {
            @Override
            public Map call() throws Exception {
                return getResult(request1);
            }
        });

        FutureTask futureTask2 = new FutureTask<>(new Callable() {
            @Override
            public Map call() throws Exception {
                return getResult(request2);
            }
        });

        FutureTask futureTask3 = new FutureTask<>(new Callable() {
            @Override
            public Map call() throws Exception {
                return getResult(request3);
            }
        });

        executorService.submit(futureTask1);
        executorService.submit(futureTask2);
        executorService.submit(futureTask3);

        Map result1 = futureTask1.get();
        Map result2 = futureTask2.get();
        Map result3 = futureTask3.get();
        List list1 = (List) result1.get("data");
        List list2 = (List) result2.get("data");
        List list3 = (List) result3.get("data");
        list1.addAll(list2);
        list1.addAll(list3);
        System.out.println("result list : " + JSONObject.toJSONString(list1));

    }


    @Test
    public void testFuture() throws ExecutionException, InterruptedException {
        Future future1 = executorService.submit(new Callable() {
            @Override
            public Map call() throws Exception {
                return getResult(request1);
            }
        });

        Future future2 = executorService.submit(new Callable() {
            @Override
            public Map call() throws Exception {
                return getResult(request2);
            }
        });

        Future future3 = executorService.submit(new Callable() {
            @Override
            public Map call() throws Exception {
                return getResult(request3);
            }
        });
        Map result1 = future1.get();
        Map result2 = future2.get();
        Map result3 = future3.get();

        List list1 = (List) result1.get("data");
        List list2 = (List) result2.get("data");
        List list3 = (List) result3.get("data");
        list1.addAll(list2);
        list1.addAll(list3);
        System.out.println("result list : " + JSONObject.toJSONString(list1));

    }


    private Map getResult(String request) throws InterruptedException {
        Map result = new HashMap<>();
        List list = new ArrayList<>();
        for (int i = 0 ; i < 10 ; i ++){
            list.add(request+":"+i);
        }
        result.put("rtnCode","0000");
        result.put("rtnMsg","查询成功");
        result.put("data",list);
        Thread.sleep(5000);
        System.out.println(request+"查询成功");
        return result;
    }


}
Java异步编程之Future

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