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// Copyright (c) 2012 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 WEBKIT_FILEAPI_MEDIA_MTP_DEVICE_MAP_SERVICE_H_
#define WEBKIT_FILEAPI_MEDIA_MTP_DEVICE_MAP_SERVICE_H_
#include <map>
#include "base/files/file_path.h"
#include "base/lazy_instance.h"
#include "base/synchronization/lock.h"
#include "base/threading/thread_checker.h"
#include "webkit/storage/webkit_storage_export.h"
namespace fileapi {
class MTPDeviceDelegate;
class MTPDeviceAsyncDelegate;
// This class provides media transfer protocol (MTP) device delegate to
// complete media file system operations. ScopedMTPDeviceMapEntry class
// manages the device map entries.
class WEBKIT_STORAGE_EXPORT MTPDeviceMapService {
public:
static MTPDeviceMapService* GetInstance();
/////////////////////////////////////////////////////////////////////////////
// Following methods are used to manage MTPDeviceAsyncDelegate objects. //
/////////////////////////////////////////////////////////////////////////////
// Adds the MTP device delegate to the map service. |device_location|
// specifies the mount location of the MTP device.
// Called on the IO thread.
void AddAsyncDelegate(const base::FilePath::StringType& device_location,
MTPDeviceAsyncDelegate* delegate);
// Removes the MTP device delegate from the map service. |device_location|
// specifies the mount location of the MTP device.
// Called on the IO thread.
void RemoveAsyncDelegate(const base::FilePath::StringType& device_location);
// Gets the media device delegate associated with |filesystem_id|.
// Return NULL if the |filesystem_id| is no longer valid (e.g. because the
// corresponding device is detached, etc).
// Called on the IO thread.
MTPDeviceAsyncDelegate* GetMTPDeviceAsyncDelegate(
const std::string& filesystem_id);
/////////////////////////////////////////////////////////////////////////////
// Following methods are used to manage synchronous MTPDeviceDelegate //
// objects. //
// TODO(kmadhusu): Remove the synchronous interfaces after fixing //
// crbug.com/154835 //
/////////////////////////////////////////////////////////////////////////////
// Adds the synchronous MTP device delegate to the map service.
// |device_location| specifies the mount location of the MTP device.
// Called on a media task runner thread.
void AddDelegate(const base::FilePath::StringType& device_location,
MTPDeviceDelegate* delegate);
// Removes the MTP device delegate from the map service. |device_location|
// specifies the mount location of the MTP device.
// Called on the UI thread.
void RemoveDelegate(const base::FilePath::StringType& device_location);
// Gets the synchronous media device delegate associated with |filesystem_id|.
// Return NULL if the |filesystem_id| is no longer valid (e.g. because the
// corresponding device is detached, etc).
// Called on a media task runner thread.
// TODO(thestig) DCHECK AddDelegate() and GetMTPDeviceDelegate() are actually
// called on the same task runner.
MTPDeviceDelegate* GetMTPDeviceDelegate(const std::string& filesystem_id);
private:
friend struct base::DefaultLazyInstanceTraits<MTPDeviceMapService>;
// Mapping of device_location and MTPDeviceDelegate* object. It is safe to
// store and access the raw pointer. This class operates on the IO thread.
typedef std::map<base::FilePath::StringType, MTPDeviceDelegate*>
SyncDelegateMap;
// Mapping of device_location and MTPDeviceDelegate* object. It is safe to
// store and access the raw pointer. This class operates on the IO thread.
typedef std::map<base::FilePath::StringType, MTPDeviceAsyncDelegate*>
AsyncDelegateMap;
// Get access to this class using GetInstance() method.
MTPDeviceMapService();
~MTPDeviceMapService();
/////////////////////////////////////////////////////////////////////////////
// Following member variables are used to manage synchronous //
// MTP device delegate objects. //
/////////////////////////////////////////////////////////////////////////////
// Map of attached mtp device delegates.
SyncDelegateMap sync_delegate_map_;
base::Lock lock_;
/////////////////////////////////////////////////////////////////////////////
// Following member variables are used to manage asynchronous //
// MTP device delegate objects. //
/////////////////////////////////////////////////////////////////////////////
// Map of attached mtp device async delegates.
AsyncDelegateMap async_delegate_map_;
base::ThreadChecker thread_checker_;
DISALLOW_COPY_AND_ASSIGN(MTPDeviceMapService);
};
} // namespace fileapi
#endif // WEBKIT_FILEAPI_MEDIA_MTP_DEVICE_MAP_SERVICE_H_
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