ExecutorService在调用线程中运行任务？

Question

是否有任何java.util.ExecutorService实现只是在调用线程中运行所有已执行的任务？如果默认情况下这不包含在Java中,那么是否有一个包含这样的实现的库？

Answer 1

您可以使用Guava com.google.common.util.concurrent.MoreExecutors.sameThreadExecutor()完全按照您的要求执行操作:https://github.com/google/guava/blob/0434c5199c83c3f43b8b6a86c62e121d518fe7d0/guava/src/com/google/通用/ UTIL /并发/ MoreExecutors.java#L267

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

Answer 2

我能找到的唯一现有实现是SynchronousExecutorService- 不幸的是埋在骆驼库的某个地方。

将源代码（不带注释）粘贴到此处以供将来参考：

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();
    }

}