Drive: add a method to clear all local cache.

chrome/browser/chromeos/gdata/gdata_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_GDATA_GDATA_CACHE_H_
 #define CHROME_BROWSER_CHROMEOS_GDATA_GDATA_CACHE_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 12 matching lines @@
 
 class SequencedTaskRunner;
 
 }  // namespace base
 
 namespace gdata {
 
 class GDataCacheEntry;
 class GDataCacheMetadata;
 
-// Callback for SetMountedStateOnUIThread.
+// Callback for SetMountedStateOnUIThread and ClearAllOnUIThread.
 typedef base::Callback<void(GDataFileError error,
-                            const FilePath& file_path)> SetMountedStateCallback;
+                            const FilePath& file_path)>
+    ChangeCacheStateCallback;
 
 // Callback for completion of cache operation.
 typedef base::Callback<void(GDataFileError error,
                             const std::string& resource_id,
                             const std::string& md5)> CacheOperationCallback;
 
 // Callback for GetFileFromCache.
 typedef base::Callback<void(GDataFileError error,
                             const std::string& resource_id,
                             const std::string& md5,
@@ skipping 176 matching lines @@
 
   // Modifies cache state, which involves the following:
   // - moves |source_path| to |dest_path|, where
   //   if we're mounting: |source_path| is the unmounted path and has .<md5>
   //       extension, and |dest_path| is the mounted path in persistent dir
   //       and has .<md5>.mounted extension;
   //   if we're unmounting: the opposite is true for the two paths, i.e.
   //       |dest_path| is the mounted path and |source_path| the unmounted path.
   void SetMountedStateOnUIThread(const FilePath& file_path,
                                  bool to_mount,
-                                 const SetMountedStateCallback& callback);
+                                 const ChangeCacheStateCallback& callback);
 
   // Modifies cache state, which involves the following:
   // - moves |source_path| to |dest_path| in persistent dir, where
   //   |source_path| has .<md5> extension and |dest_path| has .local extension
   // - if file is pinned, updates symlink in pinned dir to reference dirty file
   void MarkDirtyOnUIThread(const std::string& resource_id,
                            const std::string& md5,
                            const GetFileFromCacheCallback& callback);
 
   // Modifies cache state, i.e. creates symlink in outgoing
@@ skipping 13 matching lines @@
                             const std::string& md5,
                             const CacheOperationCallback& callback);
 
   // Does the following:
   // - remove all delete stale cache versions corresponding to |resource_id| in
   //   persistent, tmp and pinned directories
   // - remove entry corresponding to |resource_id| from cache map.
   void RemoveOnUIThread(const std::string& resource_id,
                         const CacheOperationCallback& callback);
 
+  // Does the following:
+  // - remove all the files in the cache directory.
+  // - re-create the |metadata_| instance.
+  void ClearAllOnUIThread(const ChangeCacheStateCallback& callback);
+
   // Utility method to call Initialize on UI thread.
   void RequestInitializeOnUIThread();
 
   // Force a rescan of cache files, for testing.
   void ForceRescanOnUIThreadForTesting();
 
   // Gets the cache entry for file corresponding to |resource_id| and |md5|
   // and returns true if entry exists in cache map.  Otherwise, returns false.
   // |md5| can be empty if only matching |resource_id| is desired, which may
   // happen when looking for pinned entries where symlinks' filenames have no
@@ skipping 113 matching lines @@
   // Used to implement ClearDirtyOnUIThread.
   void ClearDirty(const std::string& resource_id,
                   const std::string& md5,
                   FileOperationType file_operation_type,
                   GDataFileError* error);
 
   // Used to implement RemoveOnUIThread.
   void Remove(const std::string& resource_id,
               GDataFileError* error);
 
+  // Used to implement ClearAllUIThread.
+  void ClearAll(GDataFileError* error);
+
   // Runs callback and notifies the observers when file is pinned.
   void OnPinned(GDataFileError* error,
                 const std::string& resource_id,
                 const std::string& md5,
                 const CacheOperationCallback& callback);
 
   // Runs callback and notifies the observers when file is unpinned.
   void OnUnpinned(GDataFileError* error,
                   const std::string& resource_id,
                   const std::string& md5,
@@ skipping 47 matching lines @@
 };
 
 // Sets the free disk space getter for testing.
 // The existing getter is deleted.
 void SetFreeDiskSpaceGetterForTesting(
     FreeDiskSpaceGetterInterface* getter);
 
 }  // namespace gdata
 
 #endif  // CHROME_BROWSER_CHROMEOS_GDATA_GDATA_CACHE_H_