1 files changed, 50 insertions, 0 deletions
diff --git a/Firebase/Auth/Source/Private/FIRAuthSerialTaskQueue.h b/Firebase/Auth/Source/Private/FIRAuthSerialTaskQueue.h
new file mode 100644
index 0000000..cdae046
--- /dev/null
+++ b/Firebase/Auth/Source/Private/FIRAuthSerialTaskQueue.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright 2017 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+/** @typedef FIRAuthSerialTaskCompletionBlock
+    @brief The type of method a @c FIRAuthSerialTask must call when it is complete.
+ */
+typedef void (^FIRAuthSerialTaskCompletionBlock)(void);
+
+/** @typedef FIRAuthSerialTask
+    @brief Represents a unit of work submitted to a task queue.
+    @param complete The task MUST call the complete method when done.
+ */
+typedef void (^FIRAuthSerialTask)(FIRAuthSerialTaskCompletionBlock complete);
+
+/** @class FIRAuthSerialTaskQueue
+    @brief An easy to use serial task queue which supports a callback-based completion notification
+        system for easy asyncronous call chaining.
+ */
+@interface FIRAuthSerialTaskQueue : NSObject
+
+/** @fn enqueueTask:
+    @brief Enqueues a task for serial execution in the queue.
+    @remarks The task MUST call the complete method when done. This method is thread-safe.
+        The task block won't be executed concurrently with any other blocks in other task queues or
+        the global work queue as returned by @c FIRAuthGlobalWorkQueue , but an uncompleted task
+        (e.g. task block finished executation before complete method is called at a later time)
+        does not affect other task queues or the global work queue.
+ */
+- (void)enqueueTask:(FIRAuthSerialTask)task;
+
+@end
+
+NS_ASSUME_NONNULL_END