Question

我在App Engine项目中有一个DeferredTask，用于异步地将数据导入Firestore，如下所示：

public void run() {
    FirestoreOptions options = ...
    try (Firestore db = options.getService()) {
        CollectionReference placesCollection = db.collection("MyCollection");
        Map<String, Object> data = new HashMap<>();
        data.put("key", "value");
        DocumentReference doc = placesCollection.document("MyId");
        doc.set(data)
    } catch (Exception e) {
        ...
    }
}

代码运行没有错误，但是方法结束后，我在控制台中看到一个异常，并且没有数据写入我的集合：

java.util.concurrent.RejectedExecutionException: Task java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask@7be031d1 rejected from java.util.concurrent.ScheduledThreadPoolExecutor@6808a2d4[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0]
  at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2047)
  at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:823)
  at java.util.concurrent.ScheduledThreadPoolExecutor.delayedExecute(ScheduledThreadPoolExecutor.java:326)
  at java.util.concurrent.ScheduledThreadPoolExecutor.schedule(ScheduledThreadPoolExecutor.java:533)

如果我等待写入完成，则看不到异常：

doc.set(data).get();  // block for write to complete

是我的Firestore连接由于超出try-with-resources范围而关闭，还是只需要等待set（）返回的ApiFuture完成的问题？我认为异步Firestore编写背后的想法是，您可以将它们拉开序幕，而且，如果您不在乎完成，则不必等待。

如果我不等待，则在DeferredTask中更新时，带有Firestore的AppEngine中带有Firestore的RejectedExecutionException

0 个答案: