Added blocking with Firebase sample to prevent race conditions during tests. (GoogleCloudPlatform#925)

kurtisvg · web-flow · commit fcf959d7c2a7 · 2017-11-21T08:05:23.000-08:00
diff --git a/firestore/src/main/java/com/example/firestore/snippets/ManageDataSnippets.java b/firestore/src/main/java/com/example/firestore/snippets/ManageDataSnippets.java
@@ -345,7 +345,8 @@ public Void updateCallback(Transaction transaction) throws Exception {
   String returnInfoFromTransaction(long population) throws Exception {
     Map<String, Object> map = new HashMap<>();
     map.put("population", population);
-    db.collection("cities").document("SF").set(map);
+    // Block until transaction is complete is using transaction.get()
+    db.collection("cities").document("SF").set(map).get();
     // [START fs_return_info_transaction]
     final DocumentReference docRef = db.collection("cities").document("SF");
     ApiFuture<String> transaction =
