java - 如何在继续之前等待所有可调用对象完成执行？

Question

我有以下代码散列:

public class MyCallable implements Callable<Long> {
    @Override
    public Long call() throws Exception {
        // Do stuff...
    }
}

public class MyController {
    private ExecutorService executor = Executos.newCachedTreadPool();

    public Long concurrentDoStuff() {
        List<MyCallable> workers = makeWorkers();

        List<Long> allResults = new ArrayList<Long>();
        for(MyCallable worker : workers) {
            Future<Long> workerResults = executor.submit(worker);

            try {
                allResults.add(workerResults.get());
            } catch(InterruptedException ie) {
                // Handle...
            } catch(ExecutionException ee) {
                // Handle...
            }
        }

        // Question: how do I pause here and wait for all workers to finish?
    }
}

在 for 之后-loop，我想等待所有工作人员完成后再继续。最好/最安全/最有效的方法是什么？提前致谢!

Answer 1

您可以调用:

executor.shutdown();
executor.awaitTermination(Long.MAX_VALUE , TimeUnit.NANOSECONDS);

这将(几乎)无限期地等待任务完成。