device/media_transfer_protocol/media_transfer_protocol_manager.cc

   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 #include "device/media_transfer_protocol/media_transfer_protocol_manager.h"
   6
   7 #include <algorithm>
   8 #include <map>
   9 #include <queue>
  10 #include <set>
  11 #include <utility>
  12
  13 #include "base/bind.h"
  14 #include "base/command_line.h"
  15 #include "base/location.h"
  16 #include "base/memory/weak_ptr.h"
  17 #include "base/observer_list.h"
  18 #include "base/sequenced_task_runner.h"
  19 #include "base/stl_util.h"
  20 #include "base/threading/thread_checker.h"
  21 #include "dbus/bus.h"
  22 #include "device/media_transfer_protocol/media_transfer_protocol_daemon_client.h"
  23 #include "device/media_transfer_protocol/mtp_file_entry.pb.h"
  24 #include "device/media_transfer_protocol/mtp_storage_info.pb.h"
  25 #include "third_party/cros_system_api/dbus/service_constants.h"
  26
  27 #if defined(OS_CHROMEOS)
  28 #include "chromeos/dbus/dbus_thread_manager.h"
  29 #endif
  30
  31 namespace device {
  32
  33 namespace {
  34
  35 MediaTransferProtocolManager* g_media_transfer_protocol_manager = NULL;
  36
  37 // When reading directory entries, this is the number of entries for
  38 // GetFileInfo() to read in one operation. If set too low, efficiency goes down
  39 // slightly due to the overhead of D-Bus calls. If set too high, then slow
  40 // devices may trigger a D-Bus timeout.
  41 // The value below is a good initial estimate.
  42 const size_t kFileInfoToFetchChunkSize = 25;
  43
  44 // On the first call to GetFileInfo, the offset to use is 0.
  45 const size_t kInitialOffset = 0;
  46
  47 // The MediaTransferProtocolManager implementation.
  48 class MediaTransferProtocolManagerImpl : public MediaTransferProtocolManager {
  49  public:
  50   explicit MediaTransferProtocolManagerImpl(
  51       scoped_refptr<base::SequencedTaskRunner> task_runner)
  52       : weak_ptr_factory_(this) {
  53 #if defined(OS_CHROMEOS)
  54     DCHECK(!task_runner.get());
  55 #else
  56     DCHECK(task_runner.get());
  57     dbus::Bus::Options options;
  58     options.bus_type = dbus::Bus::SYSTEM;
  59     options.connection_type = dbus::Bus::PRIVATE;
  60     options.dbus_task_runner = task_runner;
  61     session_bus_ = new dbus::Bus(options);
  62 #endif
  63
  64     if (GetBus()) {
  65       // Listen for future mtpd service owner changes, in case it is not
  66       // available right now. There is no guarantee on Linux or ChromeOS that
  67       // mtpd is running already.
  68       mtpd_owner_changed_callback_ = base::Bind(
  69           &MediaTransferProtocolManagerImpl::FinishSetupOnOriginThread,
  70           weak_ptr_factory_.GetWeakPtr());
  71       GetBus()->ListenForServiceOwnerChange(mtpd::kMtpdServiceName,
  72                                             mtpd_owner_changed_callback_);
  73       GetBus()->GetServiceOwner(mtpd::kMtpdServiceName,
  74                                 mtpd_owner_changed_callback_);
  75     }
  76   }
  77
  78   ~MediaTransferProtocolManagerImpl() override {
  79     DCHECK(g_media_transfer_protocol_manager);
  80     g_media_transfer_protocol_manager = NULL;
  81     if (GetBus()) {
  82       GetBus()->UnlistenForServiceOwnerChange(mtpd::kMtpdServiceName,
  83                                               mtpd_owner_changed_callback_);
  84     }
  85
  86 #if !defined(OS_CHROMEOS)
  87     session_bus_->GetDBusTaskRunner()->PostTask(
  88         FROM_HERE, base::Bind(&dbus::Bus::ShutdownAndBlock, session_bus_));
  89 #endif
  90
  91     VLOG(1) << "MediaTransferProtocolManager Shutdown completed";
  92   }
  93
  94   // MediaTransferProtocolManager override.
  95   void AddObserver(Observer* observer) override {
  96     DCHECK(thread_checker_.CalledOnValidThread());
  97     observers_.AddObserver(observer);
  98   }
  99
 100   // MediaTransferProtocolManager override.
 101   void RemoveObserver(Observer* observer) override {
 102     DCHECK(thread_checker_.CalledOnValidThread());
 103     observers_.RemoveObserver(observer);
 104   }
 105
 106   // MediaTransferProtocolManager override.
 107   const std::vector<std::string> GetStorages() const override {
 108     DCHECK(thread_checker_.CalledOnValidThread());
 109     std::vector<std::string> storages;
 110     for (StorageInfoMap::const_iterator it = storage_info_map_.begin();
 111          it != storage_info_map_.end();
 112          ++it) {
 113       storages.push_back(it->first);
 114     }
 115     return storages;
 116   }
 117
 118   // MediaTransferProtocolManager override.
 119   const MtpStorageInfo* GetStorageInfo(
 120       const std::string& storage_name) const override {
 121     DCHECK(thread_checker_.CalledOnValidThread());
 122     StorageInfoMap::const_iterator it = storage_info_map_.find(storage_name);
 123     return it != storage_info_map_.end() ? &it->second : NULL;
 124   }
 125
 126   // MediaTransferProtocolManager override.
 127   void OpenStorage(const std::string& storage_name,
 128                    const std::string& mode,
 129                    const OpenStorageCallback& callback) override {
 130     DCHECK(thread_checker_.CalledOnValidThread());
 131     if (!ContainsKey(storage_info_map_, storage_name) || !mtp_client_) {
 132       callback.Run(std::string(), true);
 133       return;
 134     }
 135     open_storage_callbacks_.push(callback);
 136     mtp_client_->OpenStorage(
 137         storage_name,
 138         mode,
 139         base::Bind(&MediaTransferProtocolManagerImpl::OnOpenStorage,
 140                    weak_ptr_factory_.GetWeakPtr()),
 141         base::Bind(&MediaTransferProtocolManagerImpl::OnOpenStorageError,
 142                    weak_ptr_factory_.GetWeakPtr()));
 143   }
 144
 145   // MediaTransferProtocolManager override.
 146   void CloseStorage(const std::string& storage_handle,
 147                     const CloseStorageCallback& callback) override {
 148     DCHECK(thread_checker_.CalledOnValidThread());
 149     if (!ContainsKey(handles_, storage_handle) || !mtp_client_) {
 150       callback.Run(true);
 151       return;
 152     }
 153     close_storage_callbacks_.push(std::make_pair(callback, storage_handle));
 154     mtp_client_->CloseStorage(
 155         storage_handle,
 156         base::Bind(&MediaTransferProtocolManagerImpl::OnCloseStorage,
 157                    weak_ptr_factory_.GetWeakPtr()),
 158         base::Bind(&MediaTransferProtocolManagerImpl::OnCloseStorageError,
 159                    weak_ptr_factory_.GetWeakPtr()));
 160   }
 161
 162   // MediaTransferProtocolManager override.
 163   void ReadDirectory(const std::string& storage_handle,
 164                      const uint32 file_id,
 165                      const size_t max_size,
 166                      const ReadDirectoryCallback& callback) override {
 167     DCHECK(thread_checker_.CalledOnValidThread());
 168     if (!ContainsKey(handles_, storage_handle) || !mtp_client_) {
 169       callback.Run(std::vector<MtpFileEntry>(),
 170                    false /* no more entries */,
 171                    true /* error */);
 172       return;
 173     }
 174     read_directory_callbacks_.push(callback);
 175     mtp_client_->ReadDirectoryEntryIds(
 176         storage_handle, file_id,
 177         base::Bind(&MediaTransferProtocolManagerImpl::
 178                        OnReadDirectoryEntryIdsToReadDirectory,
 179                    weak_ptr_factory_.GetWeakPtr(), storage_handle, max_size),
 180         base::Bind(&MediaTransferProtocolManagerImpl::OnReadDirectoryError,
 181                    weak_ptr_factory_.GetWeakPtr()));
 182   }
 183
 184   // MediaTransferProtocolManager override.
 185   void ReadFileChunk(const std::string& storage_handle,
 186                      uint32 file_id,
 187                      uint32 offset,
 188                      uint32 count,
 189                      const ReadFileCallback& callback) override {
 190     DCHECK(thread_checker_.CalledOnValidThread());
 191     if (!ContainsKey(handles_, storage_handle) || !mtp_client_) {
 192       callback.Run(std::string(), true);
 193       return;
 194     }
 195     read_file_callbacks_.push(callback);
 196     mtp_client_->ReadFileChunk(
 197         storage_handle, file_id, offset, count,
 198         base::Bind(&MediaTransferProtocolManagerImpl::OnReadFile,
 199                    weak_ptr_factory_.GetWeakPtr()),
 200         base::Bind(&MediaTransferProtocolManagerImpl::OnReadFileError,
 201                    weak_ptr_factory_.GetWeakPtr()));
 202   }
 203
 204   void GetFileInfo(const std::string& storage_handle,
 205                    uint32 file_id,
 206                    const GetFileInfoCallback& callback) override {
 207     DCHECK(thread_checker_.CalledOnValidThread());
 208     if (!ContainsKey(handles_, storage_handle) || !mtp_client_) {
 209       callback.Run(MtpFileEntry(), true);
 210       return;
 211     }
 212     std::vector<uint32> file_ids;
 213     file_ids.push_back(file_id);
 214     get_file_info_callbacks_.push(callback);
 215     mtp_client_->GetFileInfo(
 216         storage_handle,
 217         file_ids,
 218         kInitialOffset,
 219         file_ids.size(),
 220         base::Bind(&MediaTransferProtocolManagerImpl::OnGetFileInfo,
 221                    weak_ptr_factory_.GetWeakPtr()),
 222         base::Bind(&MediaTransferProtocolManagerImpl::OnGetFileInfoError,
 223                    weak_ptr_factory_.GetWeakPtr()));
 224   }
 225
 226   void CopyFileFromLocal(const std::string& storage_handle,
 227                          const int source_file_descriptor,
 228                          const uint32 parent_id,
 229                          const std::string& file_name,
 230                          const CopyFileFromLocalCallback& callback) override {
 231     DCHECK(thread_checker_.CalledOnValidThread());
 232     if (!ContainsKey(handles_, storage_handle) || !mtp_client_) {
 233       callback.Run(true /* error */);
 234       return;
 235     }
 236     copy_file_from_local_callbacks_.push(callback);
 237     mtp_client_->CopyFileFromLocal(
 238         storage_handle, source_file_descriptor, parent_id, file_name,
 239         base::Bind(&MediaTransferProtocolManagerImpl::OnCopyFileFromLocal,
 240                    weak_ptr_factory_.GetWeakPtr()),
 241         base::Bind(&MediaTransferProtocolManagerImpl::OnCopyFileFromLocalError,
 242                    weak_ptr_factory_.GetWeakPtr()));
 243   }
 244
 245   void DeleteObject(const std::string& storage_handle,
 246                     const uint32 object_id,
 247                     const DeleteObjectCallback& callback) override {
 248     DCHECK(thread_checker_.CalledOnValidThread());
 249     if (!ContainsKey(handles_, storage_handle) || !mtp_client_) {
 250       callback.Run(true /* error */);
 251       return;
 252     }
 253     delete_object_callbacks_.push(callback);
 254     mtp_client_->DeleteObject(
 255         storage_handle, object_id,
 256         base::Bind(&MediaTransferProtocolManagerImpl::OnDeleteObject,
 257                    weak_ptr_factory_.GetWeakPtr()),
 258         base::Bind(&MediaTransferProtocolManagerImpl::OnDeleteObjectError,
 259                    weak_ptr_factory_.GetWeakPtr()));
 260   }
 261
 262  private:
 263   // Map of storage names to storage info.
 264   typedef std::map<std::string, MtpStorageInfo> StorageInfoMap;
 265   // Callback queues - DBus communication is in-order, thus callbacks are
 266   // received in the same order as the requests.
 267   typedef std::queue<OpenStorageCallback> OpenStorageCallbackQueue;
 268   // (callback, handle)
 269   typedef std::queue<std::pair<CloseStorageCallback, std::string>
 270                     > CloseStorageCallbackQueue;
 271   typedef std::queue<ReadDirectoryCallback> ReadDirectoryCallbackQueue;
 272   typedef std::queue<ReadFileCallback> ReadFileCallbackQueue;
 273   typedef std::queue<GetFileInfoCallback> GetFileInfoCallbackQueue;
 274   typedef std::queue<CopyFileFromLocalCallback> CopyFileFromLocalCallbackQueue;
 275   typedef std::queue<DeleteObjectCallback> DeleteObjectCallbackQueue;
 276
 277   void OnStorageAttached(const std::string& storage_name) {
 278     DCHECK(thread_checker_.CalledOnValidThread());
 279     mtp_client_->GetStorageInfo(
 280         storage_name,
 281         base::Bind(&MediaTransferProtocolManagerImpl::OnGetStorageInfo,
 282                    weak_ptr_factory_.GetWeakPtr()),
 283         base::Bind(&base::DoNothing));
 284   }
 285
 286   void OnStorageDetached(const std::string& storage_name) {
 287     DCHECK(thread_checker_.CalledOnValidThread());
 288     if (storage_info_map_.erase(storage_name) == 0) {
 289       // This can happen for a storage where
 290       // MediaTransferProtocolDaemonClient::GetStorageInfo() failed.
 291       // Return to avoid giving observers phantom detach events.
 292       return;
 293     }
 294     FOR_EACH_OBSERVER(Observer,
 295                       observers_,
 296                       StorageChanged(false /* detach */, storage_name));
 297   }
 298
 299   void OnStorageChanged(bool is_attach, const std::string& storage_name) {
 300     DCHECK(thread_checker_.CalledOnValidThread());
 301     DCHECK(mtp_client_);
 302     if (is_attach)
 303       OnStorageAttached(storage_name);
 304     else
 305       OnStorageDetached(storage_name);
 306   }
 307
 308   void OnEnumerateStorages(const std::vector<std::string>& storage_names) {
 309     DCHECK(thread_checker_.CalledOnValidThread());
 310     DCHECK(mtp_client_);
 311     for (size_t i = 0; i < storage_names.size(); ++i) {
 312       if (ContainsKey(storage_info_map_, storage_names[i])) {
 313         // OnStorageChanged() might have gotten called first.
 314         continue;
 315       }
 316       OnStorageAttached(storage_names[i]);
 317     }
 318   }
 319
 320   void OnGetStorageInfo(const MtpStorageInfo& storage_info) {
 321     DCHECK(thread_checker_.CalledOnValidThread());
 322     const std::string& storage_name = storage_info.storage_name();
 323     if (ContainsKey(storage_info_map_, storage_name)) {
 324       // This should not happen, since MediaTransferProtocolManagerImpl should
 325       // only call EnumerateStorages() once, which populates |storage_info_map_|
 326       // with the already-attached devices.
 327       // After that, all incoming signals are either for new storage
 328       // attachments, which should not be in |storage_info_map_|, or for
 329       // storage detachments, which do not add to |storage_info_map_|.
 330       // Return to avoid giving observers phantom detach events.
 331       NOTREACHED();
 332       return;
 333     }
 334
 335     // New storage. Add it and let the observers know.
 336     storage_info_map_.insert(std::make_pair(storage_name, storage_info));
 337     FOR_EACH_OBSERVER(Observer,
 338                       observers_,
 339                       StorageChanged(true /* is attach */, storage_name));
 340   }
 341
 342   void OnOpenStorage(const std::string& handle) {
 343     DCHECK(thread_checker_.CalledOnValidThread());
 344     if (!ContainsKey(handles_, handle)) {
 345       handles_.insert(handle);
 346       open_storage_callbacks_.front().Run(handle, false);
 347     } else {
 348       NOTREACHED();
 349       open_storage_callbacks_.front().Run(std::string(), true);
 350     }
 351     open_storage_callbacks_.pop();
 352   }
 353
 354   void OnOpenStorageError() {
 355     open_storage_callbacks_.front().Run(std::string(), true);
 356     open_storage_callbacks_.pop();
 357   }
 358
 359   void OnCloseStorage() {
 360     DCHECK(thread_checker_.CalledOnValidThread());
 361     const std::string& handle = close_storage_callbacks_.front().second;
 362     if (ContainsKey(handles_, handle)) {
 363       handles_.erase(handle);
 364       close_storage_callbacks_.front().first.Run(false);
 365     } else {
 366       NOTREACHED();
 367       close_storage_callbacks_.front().first.Run(true);
 368     }
 369     close_storage_callbacks_.pop();
 370   }
 371
 372   void OnCloseStorageError() {
 373     DCHECK(thread_checker_.CalledOnValidThread());
 374     close_storage_callbacks_.front().first.Run(true);
 375     close_storage_callbacks_.pop();
 376   }
 377
 378   void OnReadDirectoryEntryIdsToReadDirectory(
 379       const std::string& storage_handle,
 380       const size_t max_size,
 381       const std::vector<uint32>& file_ids) {
 382     DCHECK(thread_checker_.CalledOnValidThread());
 383
 384     if (file_ids.empty()) {
 385       OnGotDirectoryEntries(storage_handle, file_ids, kInitialOffset, max_size,
 386                             file_ids, std::vector<MtpFileEntry>());
 387       return;
 388     }
 389
 390     std::vector<uint32> sorted_file_ids = file_ids;
 391     std::sort(sorted_file_ids.begin(), sorted_file_ids.end());
 392
 393     const size_t chunk_size =
 394         max_size == 0 ? kFileInfoToFetchChunkSize
 395                       : std::min(max_size, kFileInfoToFetchChunkSize);
 396
 397     mtp_client_->GetFileInfo(
 398         storage_handle, file_ids, kInitialOffset, chunk_size,
 399         base::Bind(&MediaTransferProtocolManagerImpl::OnGotDirectoryEntries,
 400                    weak_ptr_factory_.GetWeakPtr(), storage_handle, file_ids,
 401                    kInitialOffset, max_size, sorted_file_ids),
 402         base::Bind(&MediaTransferProtocolManagerImpl::OnReadDirectoryError,
 403                    weak_ptr_factory_.GetWeakPtr()));
 404   }
 405
 406   void OnGotDirectoryEntries(const std::string& storage_handle,
 407                              const std::vector<uint32>& file_ids,
 408                              const size_t offset,
 409                              const size_t max_size,
 410                              const std::vector<uint32>& sorted_file_ids,
 411                              const std::vector<MtpFileEntry>& file_entries) {
 412     DCHECK(thread_checker_.CalledOnValidThread());
 413     DCHECK_EQ(file_ids.size(), sorted_file_ids.size());
 414
 415     // Use |sorted_file_ids| to sanity check and make sure the results are a
 416     // subset of the requested file ids.
 417     for (size_t i = 0; i < file_entries.size(); ++i) {
 418       std::vector<uint32>::const_iterator it =
 419           std::lower_bound(sorted_file_ids.begin(),
 420                            sorted_file_ids.end(),
 421                            file_entries[i].item_id());
 422       if (it == sorted_file_ids.end()) {
 423         OnReadDirectoryError();
 424         return;
 425       }
 426     }
 427
 428     const size_t directory_size =
 429         max_size == 0 ? file_ids.size() : std::min(file_ids.size(), max_size);
 430     size_t next_offset = directory_size;
 431     if (offset < SIZE_MAX - kFileInfoToFetchChunkSize)
 432       next_offset = std::min(next_offset, offset + kFileInfoToFetchChunkSize);
 433     bool has_more = next_offset < directory_size;
 434     read_directory_callbacks_.front().Run(file_entries,
 435                                           has_more,
 436                                           false /* no error */);
 437
 438     if (has_more) {
 439       const size_t chunk_size =
 440           std::min(directory_size - next_offset, kFileInfoToFetchChunkSize);
 441
 442       mtp_client_->GetFileInfo(
 443           storage_handle, file_ids, next_offset, chunk_size,
 444           base::Bind(&MediaTransferProtocolManagerImpl::OnGotDirectoryEntries,
 445                      weak_ptr_factory_.GetWeakPtr(), storage_handle, file_ids,
 446                      next_offset, max_size, sorted_file_ids),
 447           base::Bind(&MediaTransferProtocolManagerImpl::OnReadDirectoryError,
 448                      weak_ptr_factory_.GetWeakPtr()));
 449       return;
 450     }
 451     read_directory_callbacks_.pop();
 452   }
 453
 454   void OnReadDirectoryError() {
 455     DCHECK(thread_checker_.CalledOnValidThread());
 456     read_directory_callbacks_.front().Run(std::vector<MtpFileEntry>(),
 457                                           false /* no more entries */,
 458                                           true /* error */);
 459     read_directory_callbacks_.pop();
 460   }
 461
 462   void OnReadFile(const std::string& data) {
 463     DCHECK(thread_checker_.CalledOnValidThread());
 464     read_file_callbacks_.front().Run(data, false);
 465     read_file_callbacks_.pop();
 466   }
 467
 468   void OnReadFileError() {
 469     DCHECK(thread_checker_.CalledOnValidThread());
 470     read_file_callbacks_.front().Run(std::string(), true);
 471     read_file_callbacks_.pop();
 472   }
 473
 474   void OnGetFileInfo(const std::vector<MtpFileEntry>& entries) {
 475     DCHECK(thread_checker_.CalledOnValidThread());
 476     if (entries.size() == 1) {
 477       get_file_info_callbacks_.front().Run(entries[0], false /* no error */);
 478       get_file_info_callbacks_.pop();
 479     } else {
 480       OnGetFileInfoError();
 481     }
 482   }
 483
 484   void OnGetFileInfoError() {
 485     DCHECK(thread_checker_.CalledOnValidThread());
 486     get_file_info_callbacks_.front().Run(MtpFileEntry(), true);
 487     get_file_info_callbacks_.pop();
 488   }
 489
 490   void OnCopyFileFromLocal() {
 491     DCHECK(thread_checker_.CalledOnValidThread());
 492     copy_file_from_local_callbacks_.front().Run(false /* no error */);
 493     copy_file_from_local_callbacks_.pop();
 494   }
 495
 496   void OnCopyFileFromLocalError() {
 497     DCHECK(thread_checker_.CalledOnValidThread());
 498     copy_file_from_local_callbacks_.front().Run(true /* error */);
 499     copy_file_from_local_callbacks_.pop();
 500   }
 501
 502   void OnDeleteObject() {
 503     DCHECK(thread_checker_.CalledOnValidThread());
 504     delete_object_callbacks_.front().Run(false /* no error */);
 505     delete_object_callbacks_.pop();
 506   }
 507
 508   void OnDeleteObjectError() {
 509     DCHECK(thread_checker_.CalledOnValidThread());
 510     delete_object_callbacks_.front().Run(true /* error */);
 511     delete_object_callbacks_.pop();
 512   }
 513
 514   // Get the Bus object used to communicate with mtpd.
 515   dbus::Bus* GetBus() {
 516     DCHECK(thread_checker_.CalledOnValidThread());
 517 #if defined(OS_CHROMEOS)
 518     return chromeos::DBusThreadManager::Get()->GetSystemBus();
 519 #else
 520     return session_bus_.get();
 521 #endif
 522   }
 523
 524   // Callback to finish initialization after figuring out if the mtpd service
 525   // has an owner, or if the service owner has changed.
 526   // |mtpd_service_owner| contains the name of the current owner, if any.
 527   void FinishSetupOnOriginThread(const std::string& mtpd_service_owner) {
 528     DCHECK(thread_checker_.CalledOnValidThread());
 529
 530     if (mtpd_service_owner == current_mtpd_owner_)
 531       return;
 532
 533     // In the case of a new service owner, clear |storage_info_map_|.
 534     // Assume all storages have been disconnected. If there is a new service
 535     // owner, reconnecting to it will reconnect all the storages as well.
 536
 537     // Save a copy of |storage_info_map_| keys as |storage_info_map_| can
 538     // change in OnStorageDetached().
 539     std::vector<std::string> storage_names;
 540     for (StorageInfoMap::const_iterator it = storage_info_map_.begin();
 541          it != storage_info_map_.end();
 542          ++it) {
 543       storage_names.push_back(it->first);
 544     }
 545     for (size_t i = 0; i != storage_names.size(); ++i)
 546       OnStorageDetached(storage_names[i]);
 547
 548     if (mtpd_service_owner.empty()) {
 549       current_mtpd_owner_.clear();
 550       mtp_client_.reset();
 551       return;
 552     }
 553
 554     current_mtpd_owner_ = mtpd_service_owner;
 555
 556     mtp_client_.reset(MediaTransferProtocolDaemonClient::Create(GetBus()));
 557
 558     // Set up signals and start initializing |storage_info_map_|.
 559     mtp_client_->ListenForChanges(
 560         base::Bind(&MediaTransferProtocolManagerImpl::OnStorageChanged,
 561                    weak_ptr_factory_.GetWeakPtr()));
 562     mtp_client_->EnumerateStorages(
 563         base::Bind(&MediaTransferProtocolManagerImpl::OnEnumerateStorages,
 564                    weak_ptr_factory_.GetWeakPtr()),
 565         base::Bind(&base::DoNothing));
 566   }
 567
 568   // Mtpd DBus client.
 569   scoped_ptr<MediaTransferProtocolDaemonClient> mtp_client_;
 570
 571 #if !defined(OS_CHROMEOS)
 572   // And a D-Bus session for talking to mtpd.
 573   scoped_refptr<dbus::Bus> session_bus_;
 574 #endif
 575
 576   // Device attachment / detachment observers.
 577   ObserverList<Observer> observers_;
 578
 579   // Map to keep track of attached storages by name.
 580   StorageInfoMap storage_info_map_;
 581
 582   // Set of open storage handles.
 583   std::set<std::string> handles_;
 584
 585   dbus::Bus::GetServiceOwnerCallback mtpd_owner_changed_callback_;
 586
 587   std::string current_mtpd_owner_;
 588
 589   // Queued callbacks.
 590   OpenStorageCallbackQueue open_storage_callbacks_;
 591   CloseStorageCallbackQueue close_storage_callbacks_;
 592   ReadDirectoryCallbackQueue read_directory_callbacks_;
 593   ReadFileCallbackQueue read_file_callbacks_;
 594   GetFileInfoCallbackQueue get_file_info_callbacks_;
 595   CopyFileFromLocalCallbackQueue copy_file_from_local_callbacks_;
 596   DeleteObjectCallbackQueue delete_object_callbacks_;
 597
 598   base::ThreadChecker thread_checker_;
 599
 600   base::WeakPtrFactory<MediaTransferProtocolManagerImpl> weak_ptr_factory_;
 601
 602   DISALLOW_COPY_AND_ASSIGN(MediaTransferProtocolManagerImpl);
 603 };
 604
 605 }  // namespace
 606
 607 // static
 608 MediaTransferProtocolManager* MediaTransferProtocolManager::Initialize(
 609     scoped_refptr<base::SequencedTaskRunner> task_runner) {
 610   DCHECK(!g_media_transfer_protocol_manager);
 611
 612   g_media_transfer_protocol_manager =
 613       new MediaTransferProtocolManagerImpl(task_runner);
 614   VLOG(1) << "MediaTransferProtocolManager initialized";
 615
 616   return g_media_transfer_protocol_manager;
 617 }
 618
 619 }  // namespace device