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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. | 
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be | 
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. | 
| 4 | 4 | 
| 5 #ifndef CONTENT_BROWSER_DEVICE_SENSORS_DATA_FETCHER_SHARED_MEMORY_BASE_H_ | 5 #ifndef DEVICE_DEVICE_SENSORS_DATA_FETCHER_SHARED_MEMORY_BASE_H_ | 
| 6 #define CONTENT_BROWSER_DEVICE_SENSORS_DATA_FETCHER_SHARED_MEMORY_BASE_H_ | 6 #define DEVICE_DEVICE_SENSORS_DATA_FETCHER_SHARED_MEMORY_BASE_H_ | 
| 7 | 7 | 
| 8 #include <map> | 8 #include <map> | 
| 9 | 9 | 
| 10 #include "base/memory/scoped_ptr.h" | 10 #include "base/memory/scoped_ptr.h" | 
| 11 #include "base/memory/shared_memory.h" | 11 #include "base/memory/shared_memory.h" | 
| 12 #include "base/message_loop/message_loop.h" | 12 #include "base/message_loop/message_loop.h" | 
| 13 #include "content/browser/device_sensors/inertial_sensor_consts.h" | 13 #include "device/device_sensors/device_sensors_export.h" | 
| 14 #include "content/common/content_export.h" | 14 #include "device/device_sensors/inertial_sensor_consts.h" | 
| 15 | 15 | 
| 16 namespace content { | 16 namespace device { | 
| 17 | 17 | 
| 18 // Sensor data fetchers should derive from this base class and implement | 18 // Sensor data fetchers should derive from this base class and implement | 
| 19 // the abstract Start() and Stop() methods. | 19 // the abstract Start() and Stop() methods. | 
| 20 // If the fetcher requires polling it should also implement IsPolling() | 20 // If the fetcher requires polling it should also implement IsPolling() | 
| 21 // to return true and the Fetch() method which will be called from the | 21 // to return true and the Fetch() method which will be called from the | 
| 22 // polling thread to fetch data at regular intervals. | 22 // polling thread to fetch data at regular intervals. | 
| 23 class CONTENT_EXPORT DataFetcherSharedMemoryBase { | 23 class DEVICE_SENSORS_EXPORT DataFetcherSharedMemoryBase { | 
| 24  public: | 24  public: | 
| 25   // Starts updating the shared memory buffer with sensor data at | 25   // Starts updating the shared memory buffer with sensor data at | 
| 26   // regular intervals. Returns true if the relevant sensors could | 26   // regular intervals. Returns true if the relevant sensors could | 
| 27   // be successfully activated. | 27   // be successfully activated. | 
| 28   bool StartFetchingDeviceData(ConsumerType consumer_type); | 28   bool StartFetchingDeviceData(ConsumerType consumer_type); | 
| 29 | 29 | 
| 30   // Stops updating the shared memory buffer. Returns true if the | 30   // Stops updating the shared memory buffer. Returns true if the | 
| 31   // relevant sensors could be successfully deactivated. | 31   // relevant sensors could be successfully deactivated. | 
| 32   bool StopFetchingDeviceData(ConsumerType consumer_type); | 32   bool StopFetchingDeviceData(ConsumerType consumer_type); | 
| 33 | 33 | 
| 34   // Should be called before destruction to make sure all active | 34   // Should be called before destruction to make sure all active | 
| 35   // sensors are unregistered. | 35   // sensors are unregistered. | 
| 36   virtual void Shutdown(); | 36   virtual void Shutdown(); | 
| 37 | 37 | 
| 38   // Returns the shared memory handle of the device sensor data | 38   // Returns the shared memory handle of the device sensor data | 
| 39   // duplicated into the given process. This method should only be | 39   // duplicated into the given process. This method should only be | 
| 40   // called after a call to StartFetchingDeviceData method with | 40   // called after a call to StartFetchingDeviceData method with | 
| 41   // corresponding |consumer_type| parameter. | 41   // corresponding |consumer_type| parameter. | 
| 42   base::SharedMemoryHandle GetSharedMemoryHandleForProcess( | 42   base::SharedMemoryHandle GetSharedMemoryHandleForProcess( | 
| 43       ConsumerType consumer_type, base::ProcessHandle process); | 43       ConsumerType consumer_type, | 
|  | 44       base::ProcessHandle process); | 
| 44 | 45 | 
| 45   enum FetcherType { | 46   enum FetcherType { | 
| 46     // Fetcher runs on the same thread as its creator. | 47     // Fetcher runs on the same thread as its creator. | 
| 47     FETCHER_TYPE_DEFAULT, | 48     FETCHER_TYPE_DEFAULT, | 
| 48     // Fetcher runs on a separate thread calling |Fetch()| at regular intervals. | 49     // Fetcher runs on a separate thread calling |Fetch()| at regular intervals. | 
| 49     FETCHER_TYPE_POLLING_CALLBACK, | 50     FETCHER_TYPE_POLLING_CALLBACK, | 
| 50     // Fetcher runs on a separate thread, but no callbacks are executed. | 51     // Fetcher runs on a separate thread, but no callbacks are executed. | 
| 51     FETCHER_TYPE_SEPARATE_THREAD | 52     FETCHER_TYPE_SEPARATE_THREAD | 
| 52   }; | 53   }; | 
| 53 | 54 | 
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| 90 | 91 | 
| 91   scoped_ptr<PollingThread> polling_thread_; | 92   scoped_ptr<PollingThread> polling_thread_; | 
| 92 | 93 | 
| 93   // Owning pointers. Objects in the map are deleted in dtor. | 94   // Owning pointers. Objects in the map are deleted in dtor. | 
| 94   typedef std::map<ConsumerType, base::SharedMemory*> SharedMemoryMap; | 95   typedef std::map<ConsumerType, base::SharedMemory*> SharedMemoryMap; | 
| 95   SharedMemoryMap shared_memory_map_; | 96   SharedMemoryMap shared_memory_map_; | 
| 96 | 97 | 
| 97   DISALLOW_COPY_AND_ASSIGN(DataFetcherSharedMemoryBase); | 98   DISALLOW_COPY_AND_ASSIGN(DataFetcherSharedMemoryBase); | 
| 98 }; | 99 }; | 
| 99 | 100 | 
| 100 }  // namespace content | 101 }  // namespace device | 
| 101 | 102 | 
| 102 #endif  // CONTENT_BROWSER_DEVICE_SENSORS_DATA_FETCHER_SHARED_MEMORY_BASE_H_ | 103 #endif  // DEVICE_DEVICE_SENSORS_DATA_FETCHER_SHARED_MEMORY_BASE_H_ | 
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