[Media Router] Add DialMediaSinkService and DeviceDescriptionService

chrome/browser/media/router/dial_media_sink_service.h

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_MEDIA_ROUTER_DIAL_MEDIA_SINK_SERVICE_H_
+#define CHROME_BROWSER_MEDIA_ROUTER_DIAL_MEDIA_SINK_SERVICE_H_
+
+#include <memory>
+
+#include "chrome/browser/extensions/api/dial/dial_registry.h"
+#include "chrome/browser/media/router/device_description_service.h"
+#include "chrome/browser/media/router/dial_media_sink_cache_service.h"
+#include "chrome/browser/media/router/discovery/media_sink_internal.h"
+#include "chrome/browser/media/router/media_sink_service.h"
+
+namespace content {
+class BrowserContext;
+}
+
+namespace extensions {
+class DialAPI;
+}
+
+namespace net {
+class URLRequestContextGetter;
+}
+
+namespace media_router {
+
+class DialMediaSinkService
+    : public MediaSinkService,
+      public extensions::api::dial::DialRegistry::Observer,
+      public DeviceDescriptionService::Observer {
+ public:
+  DialMediaSinkService(const OnSinksDiscoveredCallback& callback,
+                       content::BrowserContext* browser_context);
+  ~DialMediaSinkService() override;
+
+  // MediaSinkService implementation
+  void Start() override;
+  void AddSinkQuery(MediaSinksObserver* observer) override;
+  void RemoveSinkQuery(MediaSinksObserver* observer) override;
+
+ protected:
+  using DialRegistry = extensions::api::dial::DialRegistry;
+
+  virtual DialRegistry* dial_registry();
+  virtual DeviceDescriptionService* description_service();
+  virtual DialMediaSinkCacheService* cache_service();
+
+ private:
+  friend class DialMediaSinkServiceTest;
+  FRIEND_TEST_ALL_PREFIXES(DialMediaSinkServiceTest, TestStart);
+  FRIEND_TEST_ALL_PREFIXES(DialMediaSinkServiceTest, TestFetchCompleted);
+  FRIEND_TEST_ALL_PREFIXES(DialMediaSinkServiceTest, TestIsDifferent);
+
+  // api::dial::DialRegistry::Observer implementation
+  void OnDialDeviceEvent(const DialRegistry::DeviceList& devices) override;
+  void OnDialError(DialRegistry::DialErrorCode type) override;
+
+  // DeviceDescriptionService::Observer implementation.
+  void OnDeviceDescriptionAvailable(
+      const std::string& device_label,
+      const DialDeviceDescription& description) override;
+  void OnDeviceDescriptionFetchError(const std::string& device_label,
+                                     const std::string& error_message) override;
+
+  void FetchCompleted();
+
+  bool IsDifferent(const std::vector<MediaSinkInternal> new_sinks,
+                   const std::vector<MediaSinkInternal> old_sinks);
+
+  // Device ids pending resolution
+  std::set<std::string> pending_device_labels_;
+
+  // Map of <sink id, DialMediaSink> for current round discovery.
+  // std::map<std::string, DialMediaSink> dial_sinks_;
+
+  // Timer for finishing fetching.
+  base::OneShotTimer finish_timer_;
+
+  // |dial_api_| lives in IO thread. It owns |dial_registry_|.
+  scoped_refptr<extensions::DialAPI> dial_api_;
+
+  // This class does not take ownership of |dial_registry_|. |dial_api_| owns
+  // this.
+  DialRegistry* dial_registry_;
+
+  std::unique_ptr<DeviceDescriptionService> description_service_;
+  std::unique_ptr<DialMediaSinkCacheService> cache_service_;
+
+  content::BrowserContext* browser_context_;
+  net::URLRequestContextGetter* request_context_;
+
+  std::vector<MediaSinkInternal> mrp_sinks_;
+
+  bool network_disconnected_;
+};
+
+}  // namespace media_router
+
+#endif  // CHROME_BROWSER_MEDIA_ROUTER_DIAL_MEDIA_SINK_SERVICE_H_