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// Copyright 2014 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 COMPONENTS_STORAGE_MONITOR_STORAGE_MONITOR_H_
#define COMPONENTS_STORAGE_MONITOR_STORAGE_MONITOR_H_
#include <map>
#include <string>
#include <vector>
#include "base/callback.h"
#include "base/files/file_path.h"
#include "base/memory/scoped_ptr.h"
#include "base/observer_list_threadsafe.h"
#include "base/strings/string16.h"
#include "base/synchronization/lock.h"
#include "base/threading/thread_checker.h"
#include "build/build_config.h"
#include "components/storage_monitor/storage_info.h"
class MediaFileSystemRegistryTest;
class MediaGalleriesPlatformAppBrowserTest;
class SystemStorageApiTest;
class SystemStorageEjectApiTest;
namespace device {
class MediaTransferProtocolManager;
}
namespace storage_monitor {
class RemovableStorageObserver;
class TransientDeviceIds;
// Base class for platform-specific instances watching for removable storage
// attachments/detachments.
// Lifecycle contracts: This class is created in the browser process
// before the profile is initialized, so listeners can be
// created during profile construction. The platform-specific initialization,
// which can lead to calling registered listeners with notifications of
// attached volumes, are done lazily at first use through the async
// |EnsureInitialized()| method. That must be done before any of the registered
// listeners will receive updates or calls to other API methods return
// meaningful results.
// A post-initialization |GetAttachedStorage()| call coupled with a
// registered listener will receive a complete set, albeit potentially with
// duplicates. This is because there's no tracking between when listeners were
// registered and the state of initialization, and the fact that platforms
// behave differently in how these notifications are provided.
class StorageMonitor {
public:
// This interface is provided to generators of storage notifications.
class Receiver {
public:
virtual ~Receiver();
virtual void ProcessAttach(const StorageInfo& info) = 0;
virtual void ProcessDetach(const std::string& id) = 0;
virtual void MarkInitialized() = 0;
};
// Status codes for the result of an EjectDevice() call.
enum EjectStatus {
EJECT_OK,
EJECT_IN_USE,
EJECT_NO_SUCH_DEVICE,
EJECT_FAILURE
};
// Instantiates the StorageMonitor singleton. This function does not
// guarantee the complete initialization of the object. For that, see
// |EnsureInitialized|.
static void Create();
// Destroys the StorageMonitor singleton.
static void Destroy();
// Returns a pointer to an object owned by BrowserProcess, with lifetime
// starting before main message loop start, and ending after main message loop
// shutdown. Called outside it's lifetime (or with no browser process),
// returns NULL.
static StorageMonitor* GetInstance();
static void SetStorageMonitorForTesting(
scoped_ptr<StorageMonitor> storage_monitor);
virtual ~StorageMonitor();
// Ensures that the storage monitor is initialized. The provided callback, if
// non-null, will be called when initialization is complete. If initialization
// has already completed, this callback will be invoked within the calling
// stack. Before the callback is run, calls to |GetAllAvailableStorages| and
// |GetStorageInfoForPath| may not return the correct results. In addition,
// registered observers will not be notified on device attachment/detachment.
// Should be invoked on the UI thread; callbacks will be run on the UI thread.
void EnsureInitialized(base::Closure callback);
// Return true if the storage monitor has already been initialized.
bool IsInitialized() const;
// Finds the device that contains |path| and populates |device_info|.
// Should be able to handle any path on the local system, not just removable
// storage. Returns false if unable to find the device.
virtual bool GetStorageInfoForPath(
const base::FilePath& path,
StorageInfo* device_info) const = 0;
// TODO(gbillock): make this either unnecessary (implementation-specific) or
// platform-independent.
#if defined(OS_WIN)
// Gets the MTP device storage information specified by |storage_device_id|.
// On success, returns true and fills in |device_location| with device
// interface details and |storage_object_id| with the string ID that
// uniquely identifies the object on the device. This ID need not be
// persistent across sessions.
virtual bool GetMTPStorageInfoFromDeviceId(
const std::string& storage_device_id,
base::string16* device_location,
base::string16* storage_object_id) const = 0;
#endif
#if defined(OS_LINUX)
virtual device::MediaTransferProtocolManager*
media_transfer_protocol_manager() = 0;
#endif
// Returns information for all known storages on the system,
// including fixed and removable storages.
std::vector<StorageInfo> GetAllAvailableStorages() const;
void AddObserver(RemovableStorageObserver* obs);
void RemoveObserver(RemovableStorageObserver* obs);
std::string GetTransientIdForDeviceId(const std::string& device_id);
std::string GetDeviceIdForTransientId(const std::string& transient_id) const;
virtual void EjectDevice(
const std::string& device_id,
base::Callback<void(EjectStatus)> callback);
protected:
friend class ::MediaFileSystemRegistryTest;
friend class ::MediaGalleriesPlatformAppBrowserTest;
friend class ::SystemStorageApiTest;
friend class ::SystemStorageEjectApiTest;
StorageMonitor();
virtual Receiver* receiver() const;
// Called to initialize the storage monitor.
virtual void Init() = 0;
// Called by subclasses to mark the storage monitor as
// fully initialized. Must be called on the UI thread.
void MarkInitialized();
private:
// Internal method for creating platform specific StorageMonitor.
static StorageMonitor* CreateInternal();
class ReceiverImpl;
friend class ReceiverImpl;
// Key: device id.
typedef std::map<std::string, StorageInfo> StorageMap;
void ProcessAttach(const StorageInfo& storage);
void ProcessDetach(const std::string& id);
scoped_ptr<Receiver> receiver_;
scoped_refptr<base::ObserverListThreadSafe<RemovableStorageObserver>>
observer_list_;
// Used to make sure we call initialize from the same thread as creation.
base::ThreadChecker thread_checker_;
bool initializing_;
bool initialized_;
std::vector<base::Closure> on_initialize_callbacks_;
// For manipulating storage_map_ structure.
mutable base::Lock storage_lock_;
// Map of all known storage devices,including fixed and removable storages.
StorageMap storage_map_;
scoped_ptr<TransientDeviceIds> transient_device_ids_;
};
} // namespace storage_monitor
#endif // COMPONENTS_STORAGE_MONITOR_STORAGE_MONITOR_H_
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