java - 如何使Java(AppEngine)中的延迟任务在失败时不重复？

Question

我阅读了谷歌文档，但只有关于非延迟任务的说法。在那里我们创建带有参数的 xml 文件，并可以指定重试次数。

但我使用延迟任务:

public static class ExpensiveOperation implements DeferredTask
{
  @Override
  public void run()
  {
    System.out.println("Doing an expensive operation...");
    // expensive operation to be backgrounded goes here
  }
}

并以这种方式创建它:

Queue queue = QueueFactory.getDefaultQueue();         
queue.add(TaskOptions.Builder.withPayload(new ExpensiveOperation(/*different params*/)));

如何指定我不希望它在失败时重新启动？

Answer 1

我不是 Java 用户，但我在 Interface DeferredTask 中看到了这一点我认为您可以使用:

Normal return from this method is considered success and will not retry unless DeferredTaskContext.markForRetry() is called. Exceptions thrown from this method will indicate a failure and will be processed as a retry attempt unless DeferredTaskContext.setDoNotRetry(boolean) was set to true.