[Media Router] Add DialMediaSinkService and DeviceDescriptionService

chrome/browser/media/router/dial_media_sink_cache_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_CACHE_SERVICE_H_
+#define CHROME_BROWSER_MEDIA_ROUTER_DIAL_MEDIA_SINK_CACHE_SERVICE_H_
+
+#include <memory>
+
+#include "base/threading/thread_checker.h"
+#include "chrome/browser/extensions/api/dial/dial_registry.h"
+#include "chrome/browser/media/router/device_description_service.h"
+#include "chrome/browser/media/router/discovery/media_sink_internal.h"
+#include "chrome/browser/media/router/media_sink_service.h"
+
+namespace net {
+class URLRequestContextGetter;
+}
+
+namespace media_router {
+
+class DeviceDescriptionService;
+
+struct CachedDialMediaSink {
+  MediaSinkInternal sink;
+  GURL description_url;
+  base::Time last_update_time;
+};
+
+class DialMediaSinkCacheService {
+ public:
+  DialMediaSinkCacheService();
+  virtual ~DialMediaSinkCacheService();
+
+  // Returns all media sinks with lastUpdateTime + aliveTimeout > currentTime
+  virtual std::vector<MediaSinkInternal> GetAliveSinks();
+
+  // Remove all dead media sinks if |network_connected| is true. No op if
+  // |network_connected| is false;
+  void PruneInactiveSinks(bool network_connected,
+                          DeviceDescriptionService* description_service,
+                          net::URLRequestContextGetter* request_context);
+
+  // Create a media sink from |device_description|. If sink exists in cache,
+  // update it if any field has changed since last update and update
+  // lastUpdateTime. If sink deos not exist, add it to cache.
+  // Returns true if add or update actually happens.
+  bool AddOrUpdateSink(const DialDeviceDescription& device_description);
+
+ private:
+  friend class DialMediaSinkCacheServiceTest;
+
+  // Returns true if sink's lastUpdateTime + aliveTimeout > currentTime.
+  bool IsAlive(const CachedDialMediaSink& sink);
+
+  void OnCheckAccessCompleted(const std::string& sink_id, bool is_accessible);
+
+  // Map of <sink id, CachedDialMediaSink>
+  std::map<std::string, CachedDialMediaSink> cached_sinks_;
+
+  base::ThreadChecker thread_checker_;
+};
+
+}  // namespace media_router
+
+#endif  // CHROME_BROWSER_MEDIA_ROUTER_DIAL_MEDIA_SINK_CACHE_SERVICE_H_