drive: Support offline delete

chrome/browser/chromeos/drive/sync_client.h

 // 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 CHROME_BROWSER_CHROMEOS_DRIVE_SYNC_CLIENT_H_
 #define CHROME_BROWSER_CHROMEOS_DRIVE_SYNC_CLIENT_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 15 matching lines @@
 
 namespace file_system {
 class DownloadOperation;
 class OperationObserver;
 class UpdateOperation;
 }
 
 namespace internal {
 
 class FileCache;
+class RemovePerformer;
 class ResourceMetadata;
 
 // The SyncClient is used to synchronize pinned files on Drive and the
 // cache on the local drive.
 //
 // If the user logs out before fetching of the pinned files is complete, this
 // client resumes fetching operations next time the user logs in, based on
 // the states left in the cache.
 class SyncClient {
  public:
@@ skipping 17 matching lines @@
 
   // Adds a fetch task to the queue.
   void AddFetchTask(const std::string& local_id);
 
   // Removes a fetch task from the queue.
   void RemoveFetchTask(const std::string& local_id);
 
   // Adds an upload task to the queue.
   void AddUploadTask(const std::string& local_id);
 
+  // Adds a remove task to the queue.
+  void AddRemoveTask(const std::string& local_id);
+
   // Starts processing the backlog (i.e. pinned-but-not-filed files and
   // dirty-but-not-uploaded files). Kicks off retrieval of the local
   // IDs of these files, and then starts the sync loop.
   void StartProcessingBacklog();
 
   // Starts checking the existing pinned files to see if these are
   // up-to-date. If stale files are detected, the local IDs of these files
   // are added to the queue and the sync loop is started.
   void StartCheckingExistingPinnedFiles();
 
@@ skipping 10 matching lines @@
   // existing one, and adds a new one to the end of the queue.
   void AddTaskToQueue(SyncType type,
                       const std::string& local_id,
                       const base::TimeDelta& delay);
 
   // Called when a task is ready to be added to the queue.
   void StartTask(SyncType type, const std::string& local_id);
 
   // Called when the local IDs of files in the backlog are obtained.
   void OnGetLocalIdsOfBacklog(const std::vector<std::string>* to_fetch,
-                              const std::vector<std::string>* to_upload);
+                              const std::vector<std::string>* to_upload,
+                              const std::vector<std::string>* to_remove);
 
   // Adds fetch tasks.
   void AddFetchTasks(const std::vector<std::string>* local_ids);
 
   // Called when the file for |local_id| is fetched.
   // Calls DoSyncLoop() to go back to the sync loop.
   void OnFetchFileComplete(const std::string& local_id,
                            FileError error,
                            const base::FilePath& local_path,
                            scoped_ptr<ResourceEntry> entry);
 
   // Called when the file for |local_id| is uploaded.
   // Calls DoSyncLoop() to go back to the sync loop.
   void OnUploadFileComplete(const std::string& local_id, FileError error);
 
+  // Called when the entry is removed.
+  void OnRemoveComplete(const std::string& local_id, FileError error);
+
   scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;
   ResourceMetadata* metadata_;
   FileCache* cache_;
 
   // Used to fetch pinned files.
   scoped_ptr<file_system::DownloadOperation> download_operation_;
 
   // Used to upload committed files.
   scoped_ptr<file_system::UpdateOperation> update_operation_;
 
+  // Used to remove entries from the trash.
+  scoped_ptr<RemovePerformer> remove_performer_;
+
   // List of the local ids of resources which have a fetch task created.
   std::set<std::string> fetch_list_;
 
   // List of the local ids of resources which have a upload task created.
   std::set<std::string> upload_list_;
 
   // Fetch tasks which have been created, but not started yet.  If they are
   // removed before starting, they will be cancelled.
   std::set<std::string> pending_fetch_list_;
 
   // The delay is used for delaying processing tasks in AddTaskToQueue().
   base::TimeDelta delay_;
 
   // The delay is used for delaying retry of tasks on server errors.
   base::TimeDelta long_delay_;
 
   // Note: This should remain the last member so it'll be destroyed and
   // invalidate its weak pointers before any other members are destroyed.
   base::WeakPtrFactory<SyncClient> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncClient);
 };
 
 }  // namespace internal
 }  // namespace drive
 
 #endif  // CHROME_BROWSER_CHROMEOS_DRIVE_SYNC_CLIENT_H_