CompletableFuture源碼詳解之java.util.concurrent.CompletableFuture#runAsync(java.lang.Runnable)

　　CompletableFuture#runAsync方法是用來執行無返回結果的異步程序，當執行一大堆業務邏輯代碼，而又不需要返回結果的時候，可以使用此方法異步執行，提升接口性能，方法源碼如下：

/**
     * Returns a new CompletableFuture that is asynchronously completed
     * by a task running in the {@link ForkJoinPool#commonPool()} after
     * it runs the given action.
     *
     * @param runnable the action to run before completing the
     * returned CompletableFuture
     * @return the new CompletableFuture
     */
    public static CompletableFuture<Void> runAsync(Runnable runnable) {
        return asyncRunStage(asyncPool, runnable);
    }

　　源碼所示，任務使用的是 ForkJoinPool#commonPool() 線程池執行，后續會寫這塊的內容，具體使用實例如下：

import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;

/**
 * 測試類
 * @author yangchangkui
 */
public class TestMy {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        long start = System.currentTimeMillis();
        CompletableFuture<Void> voidCompletableFuture = CompletableFuture.runAsync(() -> {
            try {
                //do something ...
                Thread.sleep(300);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        });
        //判斷是否已經完成
        System.out.println("耗時1："+(System.currentTimeMillis()-start)+"，isDone:"+voidCompletableFuture.isDone());

        //do something ...
        Thread.sleep(300);
        //判斷是否已經完成
        System.out.println("耗時2："+(System.currentTimeMillis()-start)+"，isDone:"+voidCompletableFuture.isDone());
    }
}

 

執行結果如下圖：