如何检查当前队列中的任务数量？

Question

根据Push queue in GAE有许多任务请求标头。

X-AppEngine-QueueName, the name of the queue (possibly default) 
X-AppEngine-TaskName, the name of the task, or a system-generated unique ID if no name was specified 
X-AppEngine-TaskRetryCount, the number of times this task has been retried; for the first attempt, this value is 0. This number includes attempts where the task failed due to a lack of available instances and never reached the execution phase. 
X-AppEngine-TaskExecutionCount, the number of times this task has previously failed during the execution phase. This number does not include failures due to a lack of available instances. 
X-AppEngine-TaskETA, the target execution time of the task, specified in milliseconds since January 1st 1970. 

有没有办法检查已经有多少任务已经入队？

Answer 1

不是从标题，没有。但是，您可以使用QueueStatistics类来查询该信息。