chrome/browser/media_galleries/fileapi/safe_picasa_albums_indexer.h

   1 // Copyright 2013 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 CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_SAFE_PICASA_ALBUMS_INDEXER_H_
   6 #define CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_SAFE_PICASA_ALBUMS_INDEXER_H_
   7
   8 #include <queue>
   9 #include <vector>
  10
  11 #include "base/callback.h"
  12 #include "base/compiler_specific.h"
  13 #include "base/memory/weak_ptr.h"
  14 #include "chrome/common/media_galleries/picasa_types.h"
  15 #include "content/public/browser/utility_process_host_client.h"
  16
  17 namespace base {
  18 class FilePath;
  19 }
  20
  21 namespace IPC {
  22 class Message;
  23 }
  24
  25 namespace picasa {
  26
  27 // SafePicasaAlbumsIndexer indexes the contents of Picasa Albums by parsing the
  28 // INI files found in Folders. The SafePicasaAlbumsIndexer object is ref-counted
  29 // and kept alive after Start() is called until the ParserCallback is called.
  30 // The ParserCallback is guaranteed to be called eventually either when the
  31 // utility process replies or when it dies.
  32 class SafePicasaAlbumsIndexer : public content::UtilityProcessHostClient {
  33  public:
  34   typedef base::Callback<
  35       void(bool parse_success, const picasa::AlbumImagesMap&)>
  36       DoneCallback;
  37
  38   SafePicasaAlbumsIndexer(const AlbumMap& albums, const AlbumMap& folders);
  39
  40   void Start(const DoneCallback& callback);
  41
  42  private:
  43   enum ParserState {
  44     INITIAL_STATE,
  45     STARTED_PARSING_STATE,
  46     FINISHED_PARSING_STATE,
  47   };
  48
  49   // Private because content::UtilityProcessHostClient is ref-counted.
  50   ~SafePicasaAlbumsIndexer() override;
  51
  52   // Processes a batch of folders. Reposts itself until done, then starts IPC.
  53   void ProcessFoldersBatch();
  54
  55   // Launches the utility process.  Must run on the IO thread.
  56   void StartWorkOnIOThread();
  57
  58   // Notification from the utility process when it finshes indexing all the
  59   // album contents. On error will return an empty map.
  60   // Runs on the IO thread.
  61   void OnIndexPicasaAlbumsContentsFinished(const AlbumImagesMap& albums_images);
  62
  63   // UtilityProcessHostClient implementation.
  64   // Runs on the IO thread.
  65   void OnProcessCrashed(int exit_code) override;
  66   bool OnMessageReceived(const IPC::Message& message) override;
  67
  68   AlbumUIDSet album_uids_;
  69
  70   // List of folders that still need their INI files read.
  71   std::queue<base::FilePath> folders_queue_;
  72
  73   std::vector<picasa::FolderINIContents> folders_inis_;
  74
  75   // Only accessed on the Media Task Runner.
  76   DoneCallback callback_;
  77
  78   // Verifies the messages from the utility process came at the right time.
  79   // Initialized on the Media Task Runner, but only accessed on the IO thread.
  80   ParserState parser_state_;
  81
  82   DISALLOW_COPY_AND_ASSIGN(SafePicasaAlbumsIndexer);
  83 };
  84
  85 }  // namespace picasa
  86
  87 #endif  // CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_SAFE_PICASA_ALBUMS_INDEXER_H_