Media Galleries: Cache file info during a directory read to service incoming requests to get file i…

chrome/browser/media_galleries/linux/mtp_device_delegate_impl_linux.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_MEDIA_GALLERIES_LINUX_MTP_DEVICE_DELEGATE_IMPL_LINUX_H_
 #define CHROME_BROWSER_MEDIA_GALLERIES_LINUX_MTP_DEVICE_DELEGATE_IMPL_LINUX_H_
 
 #include <deque>
 #include <map>
 #include <set>
@@ skipping 42 matching lines @@
     const content::BrowserThread::ID thread_id;
     const tracked_objects::Location location;
     const base::Closure task;
   };
 
   class MTPFileNode;
 
   // Maps file ids to file nodes.
   typedef std::map<uint32, MTPFileNode*> FileIdToMTPFileNodeMap;
 
+  // Maps file paths to file info.
+  typedef std::map<base::FilePath, fileapi::DirectoryEntry> FileInfoCache;
+
   // Should only be called by CreateMTPDeviceAsyncDelegate() factory call.
   // Defer the device initializations until the first file operation request.
   // Do all the initializations in EnsureInitAndRunTask() function.
   explicit MTPDeviceDelegateImplLinux(const std::string& device_location);
 
   // Destructed via CancelPendingTasksAndDeleteDelegate().
   virtual ~MTPDeviceDelegateImplLinux();
 
   // MTPDeviceAsyncDelegate:
   virtual void GetFileInfo(const base::FilePath& file_path,
@@ skipping 198 matching lines @@
   FileIdToMTPFileNodeMap file_id_to_node_map_;
 
   // The root node of a tree-structure that caches the directory structure of
   // the MTP device.
   scoped_ptr<MTPFileNode> root_node_;
 
   // A list of child nodes encountered while a ReadDirectory operation, which
   // can return results over multiple callbacks, is in progress.
   std::set<std::string> child_nodes_seen_;
 
+  // A cache to store file metadata for file entries read during a ReadDirectory
+  // operation. Used to service incoming GetFileInfo calls for the duration of
+  // the ReadDirectory operation.
+  FileInfoCache file_info_cache_;
+
   // For callbacks that may run after destruction.
   base::WeakPtrFactory<MTPDeviceDelegateImplLinux> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MTPDeviceDelegateImplLinux);
 };
 
 #endif  // CHROME_BROWSER_MEDIA_GALLERIES_LINUX_MTP_DEVICE_DELEGATE_IMPL_LINUX_H_