1 // Copyright (c) 2012 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 CONTENT_BROWSER_DEVICE_ORIENTATION_PROVIDER_IMPL_H_ 6 #define CONTENT_BROWSER_DEVICE_ORIENTATION_PROVIDER_IMPL_H_ 7 8 #include <map> 9 #include <set> 10 #include <vector> 11 12 #include "base/memory/scoped_ptr.h" 13 #include "base/memory/weak_ptr.h" 14 #include "content/browser/device_orientation/data_fetcher.h" 15 #include "content/browser/device_orientation/device_data.h" 16 #include "content/browser/device_orientation/provider.h" 17 #include "content/common/content_export.h" 18 19 namespace base { 20 class MessageLoop; 21 } 22 23 namespace content { 24 25 class ProviderImpl : public Provider { 26 public: 27 typedef DataFetcher* (*DataFetcherFactory)(); 28 29 // Create a ProviderImpl that uses the factory to create a DataFetcher that 30 // can provide data. A NULL DataFetcherFactory indicates that there are no 31 // DataFetchers for this OS. 32 CONTENT_EXPORT ProviderImpl(DataFetcherFactory factory); 33 34 // From Provider. 35 virtual void AddObserver(Observer* observer) OVERRIDE; 36 virtual void RemoveObserver(Observer* observer) OVERRIDE; 37 38 private: 39 class PollingThread; 40 41 virtual ~ProviderImpl(); 42 43 // Starts or Stops the provider. Called from creator_loop_. 44 void Start(DeviceData::Type type); 45 void Stop(); 46 47 void ScheduleInitializePollingThread(DeviceData::Type device_data_type); 48 void ScheduleDoAddPollingDataType(DeviceData::Type type); 49 50 // Method for notifying observers of a data update. 51 // Runs on the creator_thread_. 52 void DoNotify(const scoped_refptr<const DeviceData>& data, 53 DeviceData::Type device_data_type); 54 55 static bool ShouldFireEvent(const DeviceData* old_data, 56 const DeviceData* new_data, DeviceData::Type device_data_type); 57 58 // The Message Loop on which this object was created. 59 // Typically the I/O loop, but may be something else during testing. 60 base::MessageLoop* creator_loop_; 61 62 // Members below are only to be used from the creator_loop_. 63 DataFetcherFactory factory_; 64 std::set<Observer*> observers_; 65 std::map<DeviceData::Type, scoped_refptr<const DeviceData> > 66 last_notifications_map_; 67 68 // When polling_thread_ is running, members below are only to be used 69 // from that thread. 70 base::WeakPtrFactory<ProviderImpl> weak_factory_; 71 72 // Polling is done on this background thread. PollingThread is owned by 73 // the ProviderImpl object. But its deletion doesn't happen synchronously 74 // along with deletion of the ProviderImpl. Thus this should be a raw 75 // pointer instead of scoped_ptr. 76 PollingThread* polling_thread_; 77 }; 78 79 } // namespace content 80 81 #endif // CONTENT_BROWSER_DEVICE_ORIENTATION_PROVIDER_IMPL_H_ 82
