ExecutorService的运行在调用线程的任务？(ExecutorService which

是否有任何java.util.ExecutorService实现它只是运行在调用线程的所有执行的任务？如果这不是默认包含在Java中，有没有包含这样一种方式的图书馆吗？

Answer 1:

现有的唯一实现我能找到是SynchronousExecutorService -可惜的地方埋在骆驼图书馆。

粘贴的源代码（没有评论）在这里以供将来参考：

package org.apache.camel.util.concurrent;

import java.util.List;
import java.util.concurrent.AbstractExecutorService;
import java.util.concurrent.TimeUnit;

public class SynchronousExecutorService extends AbstractExecutorService {

    private volatile boolean shutdown;

    public void shutdown() {
        shutdown = true;
    }

    public List<Runnable> shutdownNow() {
        return null;
    }

    public boolean isShutdown() {
        return shutdown;
    }

    public boolean isTerminated() {
        return shutdown;
    }

    public boolean awaitTermination(long time, TimeUnit unit) throws InterruptedException {
        return true;
    }

    public void execute(Runnable runnable) {
        runnable.run();
    }

}

Answer 2:

您可以使用番石榴com.google.common.util.concurrent.MoreExecutors.sameThreadExecutor（），这不正是你想要什么： https://github.com/google/guava/blob/0434c5199c83c3f43b8b6a86c62e121d518fe7d0/guava/src/com/google/通用/ UTIL /并发/ MoreExecutors.java＃L267

编辑：该方法已更名为com.google.common.util.concurrent.MoreExecutors.newDirectExecutorService（） https://github.com/google/guava/blob/f67ab864bde63fa6602b5688de0440957ffeaa2e/guava/src/com/google/common/util /concurrent/MoreExecutors.java#L369