1 /*
2  *  Copyright 2015 The WebRTC project authors. All Rights Reserved.
3  *
4  *  Use of this source code is governed by a BSD-style license
5  *  that can be found in the LICENSE file in the root of the source
6  *  tree. An additional intellectual property rights grant can be found
7  *  in the file PATENTS.  All contributing project authors may
8  *  be found in the AUTHORS file in the root of the source tree.
9  */
10 
11 #import <Foundation/Foundation.h>
12 
13 typedef NS_ENUM(NSInteger, RTCDispatcherQueueType) {
14   // Main dispatcher queue.
15   RTCDispatcherTypeMain,
16   // Used for starting/stopping AVCaptureSession, and assigning
17   // capture session to AVCaptureVideoPreviewLayer.
18   RTCDispatcherTypeCaptureSession,
19 };
20 
21 /** Dispatcher that asynchronously dispatches blocks to a specific
22  *  shared dispatch queue.
23  */
24 @interface RTCDispatcher : NSObject
25 
26 - (instancetype)init NS_UNAVAILABLE;
27 
28 /** Dispatch the block asynchronously on the queue for dispatchType.
29  *  @param dispatchType The queue type to dispatch on.
30  *  @param block The block to dispatch asynchronously.
31  */
32 + (void)dispatchAsyncOnType:(RTCDispatcherQueueType)dispatchType
33                       block:(dispatch_block_t)block;
34 
35 @end
36