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1 // Copyright 2017 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef CHROME_BROWSER_MEDIA_ROUTER_MEDIA_SINK_SERVICE_H_ | |
6 #define CHROME_BROWSER_MEDIA_ROUTER_MEDIA_SINK_SERVICE_H_ | |
7 | |
8 #include <memory> | |
9 #include <vector> | |
10 | |
11 #include "base/callback.h" | |
12 #include "chrome/common/media_router/media_sink.h" | |
13 | |
14 namespace media_router { | |
15 | |
16 class MediaSinksObserver; | |
17 | |
18 // A service which can be used to start background discovery and resolution of | |
19 // MediaSinks. Often these are remote devices, like Chromecast. In addition, the | |
20 // service is capable of answering MediaSink queries using the sinks that it | |
21 // generated. | |
22 // This class is not thread safe. All methods must be called from the IO thread. | |
23 class MediaSinkService { | |
24 public: | |
25 // Callback to be invoked when this class finishes sink discovering. | |
26 // Arg 0: Sinks discovered and resolved by the service. | |
27 using OnSinksDiscoveredCallback = | |
28 base::Callback<void(const std::vector<MediaSink>&)>; | |
29 | |
30 explicit MediaSinkService( | |
31 const OnSinksDiscoveredCallback& sinks_discovered_callback); | |
32 | |
33 virtual ~MediaSinkService(); | |
34 | |
35 // Starts sink discovery. No-ops if already started. | |
36 // Sinks discovered and resolved are continuously passed to | |
37 // |callback|. | |
38 virtual void Start() = 0; | |
39 | |
40 // Adds a sink query to observe for MediaSink updates. | |
41 // Multiple observers can be added for a given MediaSource. | |
42 // Start() must be called first. This class does not take | |
43 // ownership of |observer|. | |
44 virtual void AddSinkQuery(MediaSinksObserver* observer) = 0; | |
45 | |
46 // Removes a sink query and stops observing MediaSink updates. No-op if | |
47 // |observer| is not registered with this class. | |
48 virtual void RemoveSinkQuery(MediaSinksObserver* observer) = 0; | |
49 | |
50 protected: | |
51 OnSinksDiscoveredCallback sinks_discovered_callback_; | |
52 | |
53 DISALLOW_COPY_AND_ASSIGN(MediaSinkService); | |
54 }; | |
55 | |
56 } // namespace media_router | |
57 | |
58 #endif // CHROME_BROWSER_MEDIA_ROUTER_MEDIA_SINK_SERVICE_H_ | |
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