Accumulate FileSystemUsageCache updates.

webkit/fileapi/sandbox_quota_observer.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 WEBKIT_FILEAPI_SANDBOX_QUOTA_OBSERVER_H_
 #define WEBKIT_FILEAPI_SANDBOX_QUOTA_OBSERVER_H_
 
+#include <map>
+
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "webkit/fileapi/file_observers.h"
+#include "webkit/fileapi/file_system_url.h"
 
 namespace base {
 class SequencedTaskRunner;
 }
 
 namespace quota {
 class QuotaManagerProxy;
 }
 
 namespace fileapi {
 
 class FileSystemURL;
 class ObfuscatedFileUtil;
 
 class SandboxQuotaObserver
     : public FileUpdateObserver,
       public FileAccessObserver {
  public:
+  typedef std::map<FilePath, int64> PendingUpdateNotificationMap;
+
   SandboxQuotaObserver(
       quota::QuotaManagerProxy* quota_manager_proxy,
       base::SequencedTaskRunner* update_notify_runner,
       ObfuscatedFileUtil* sandbox_file_util);
   virtual ~SandboxQuotaObserver();
 
   // FileUpdateObserver overrides.
   virtual void OnStartUpdate(const FileSystemURL& url) OVERRIDE;
   virtual void OnUpdate(const FileSystemURL& url, int64 delta) OVERRIDE;
   virtual void OnEndUpdate(const FileSystemURL& url) OVERRIDE;
 
   // FileAccessObserver overrides.
   virtual void OnAccess(const FileSystemURL& url) OVERRIDE;
 
  private:
+  void ApplyPendingUsageUpdate();
+  void UpdateUsageCacheFile(const FilePath& usage_file_path, int64 delta);
+
   FilePath GetUsageCachePath(const FileSystemURL& url);
 
   scoped_refptr<quota::QuotaManagerProxy> quota_manager_proxy_;
   scoped_refptr<base::SequencedTaskRunner> update_notify_runner_;
 
   // Not owned; sandbox_file_util_ should have identical lifetime with this.
   ObfuscatedFileUtil* sandbox_file_util_;
 
+  PendingUpdateNotificationMap pending_update_notification_;
+  bool running_delayed_cache_update_;
+
   DISALLOW_COPY_AND_ASSIGN(SandboxQuotaObserver);
 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_FILEAPI_SANDBOX_QUOTA_OBSERVER_H_