Extract GetResolveFile into DownloadOperation.

chrome/browser/chromeos/drive/file_cache.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_FILE_CACHE_H_
 #define CHROME_BROWSER_CHROMEOS_DRIVE_FILE_CACHE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 130 matching lines @@
   // runs |completion_callback| upon completion.
   // Must be called on UI thread.
   void IterateOnUIThread(const CacheIterateCallback& iteration_callback,
                          const base::Closure& completion_callback);
 
   // Iterates all files in the cache and calls |iteration_callback| for each
   // file. |completion_callback| is run upon completion.
   // TODO(hashimoto): Stop using callbacks for this method. crbug.com/242818
   void Iterate(const CacheIterateCallback& iteration_callback);
 
-  // Frees up disk space to store the given number of bytes, while keeping
-  // kMinFreeSpace bytes on the disk, if needed.
-  // Runs |callback| with true when we successfully manage to have enough space.
+
+  // Runs FreeDiskSpaceIfNeededFor() on |blocking_task_runner_|, and calls
+  // |callback| with the result asynchronously.
+  // |callback| must not be null.
   // Must be called on the UI thread.
   void FreeDiskSpaceIfNeededForOnUIThread(
       int64 num_bytes,
       const InitializeCacheCallback& callback);
 
-  // Checks if file corresponding to |resource_id| and |md5| exists in cache.
+  // Frees up disk space to store a file with |num_bytes| size content, while
+  // keeping kMinFreeSpace bytes on the disk, if needed.
+  // Returns true if we successfully manage to have enough space, otherwise
+  // false.
+  bool FreeDiskSpaceIfNeededFor(int64 num_bytes);
+
+  // Runs GetFile() on |blocking_task_runner_|, and calls |callback| with
+  // the result asynchronously.
   // |callback| must not be null.
   // Must be called on the UI thread.
   void GetFileOnUIThread(const std::string& resource_id,
                          const std::string& md5,
                          const GetFileFromCacheCallback& callback);
 
+  // Checks if file corresponding to |resource_id| and |md5| exists in cache,
+  // and returns FILE_ERROR_OK with |cache_file_path| storing the path to
+  // the file.
+  // |cache_file_path| must not be null.
+  FileError GetFile(const std::string& resource_id,
+                    const std::string& md5,
+                    base::FilePath* cache_file_path);
+
   // Runs Store() on |blocking_task_runner_|, and calls |callback| with
   // the result asynchronously.
   // |callback| must not be null.
   // Must be called on the UI thread.
   void StoreOnUIThread(const std::string& resource_id,
                        const std::string& md5,
                        const base::FilePath& source_path,
                        FileOperationType file_operation_type,
                        const FileOperationCallback& callback);
 
@@ skipping 18 matching lines @@
   // - moves |source_path| to |dest_path| in persistent dir if
   //   file is not dirty
   // - creates symlink in pinned dir that references downloaded or locally
   //   modified file
   // |callback| must not be null.
   // Must be called on the UI thread.
   void PinOnUIThread(const std::string& resource_id,
                      const std::string& md5,
                      const FileOperationCallback& callback);
 
-  // Modifies cache state, which involves the following:
-  // - moves |source_path| to |dest_path| in tmp dir if file is not dirty
-  // - deletes symlink from pinned dir
+  // Runs Unpin() on |blocking_task_runner_|, and calls |callback| with the
+  // result asynchronously.
   // |callback| must not be null.
   // Must be called on the UI thread.
   void UnpinOnUIThread(const std::string& resource_id,
                        const std::string& md5,
                        const FileOperationCallback& callback);
 
+  // Modifies cache state, which involves the following:
+  // - moves the local file from pinned directory to unpinned directory.
+  // - update cache metadata.
+  FileError Unpin(const std::string& resource_id, const std::string& md5);
+
   // Sets the state of the cache entry corresponding to |resource_id| and |md5|
   // as mounted.
   // |callback| must not be null.
   // Must be called on the UI thread.
   void MarkAsMountedOnUIThread(const std::string& resource_id,
                                const std::string& md5,
                                const GetFileFromCacheCallback& callback);
 
   // Set the state of the cache entry corresponding to file_path as unmounted.
   // |callback| must not be null.
@@ skipping 106 matching lines @@
   // Initializes the cache. Returns true on success.
   bool InitializeOnBlockingPool();
 
   // Initializes the cache with in-memory cache for testing.
   // The in-memory cache is used since it's faster than the db.
   void InitializeOnBlockingPoolForTesting();
 
   // Destroys the cache on the blocking pool.
   void DestroyOnBlockingPool();
 
-  // Used to implement FreeDiskSpaceIfNeededForOnUIThread().
-  bool FreeDiskSpaceIfNeededFor(int64 num_bytes);
-
-  // Used to implement GetFileOnUIThread.
-  FileError GetFile(const std::string& resource_id,
-                    const std::string& md5,
-                    base::FilePath* cache_file_path);
-
   // Used to implement Store and StoreLocallyModifiedOnUIThread.
   // TODO(hidehiko): Merge this method with Store(), after
   // StoreLocallyModifiedOnUIThread is removed.
   FileError StoreInternal(const std::string& resource_id,
                           const std::string& md5,
                           const base::FilePath& source_path,
                           FileOperationType file_operation_type,
                           CachedFileOrigin origin);
 
   // Used to implement PinOnUIThread.
   FileError Pin(const std::string& resource_id,
                 const std::string& md5);
 
-  // Used to implement UnpinOnUIThread.
-  FileError Unpin(const std::string& resource_id,
-                  const std::string& md5);
-
   // Used to implement MarkAsMountedOnUIThread.
   FileError MarkAsMounted(const std::string& resource_id,
                           const std::string& md5,
                           base::FilePath* cache_file_path);
 
   // Used to implement MarkAsUnmountedOnUIThread.
   FileError MarkAsUnmounted(const base::FilePath& file_path);
 
   // Used to implement MarkDirtyOnUIThread.
   FileError MarkDirty(const std::string& resource_id,
@@ skipping 53 matching lines @@
 // this value.
 //
 // Copied from cryptohome/homedirs.h.
 // TODO(satorux): Share the constant.
 const int64 kMinFreeSpace = 512 * 1LL << 20;
 
 }  // namespace internal
 }  // namespace drive
 
 #endif  // CHROME_BROWSER_CHROMEOS_DRIVE_FILE_CACHE_H_