Quota: Implement QuotaBackendImpl

webkit/browser/fileapi/quota/quota_backend_impl.h

+// Copyright 2013 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_BROWSER_FILEAPI_QUOTA_QUOTA_BACKEND_IMPL_H_
+#define WEBKIT_BROWSER_FILEAPI_QUOTA_QUOTA_BACKEND_IMPL_H_
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "webkit/browser/fileapi/quota/quota_reservation_manager.h"
+#include "webkit/browser/fileapi/sandbox_file_system_backend_delegate.h"
+#include "webkit/browser/webkit_storage_browser_export.h"
+#include "webkit/common/quota/quota_status_code.h"
+
+namespace base {
+class SequencedTaskRunner;
+}
+
+namespace quota {
+class QuotaManagerProxy;
+}
+
+namespace fileapi {
+
+class FileSystemUsageCache;
+class ObfuscatedFileUtil;
+
+// An instance of this class is owned by QuotaReservationManager.
+class WEBKIT_STORAGE_BROWSER_EXPORT QuotaBackendImpl
+    : public QuotaReservationManager::QuotaBackend {
+ public:
+  typedef QuotaReservationManager::ReserveQuotaCallback
+      ReserveQuotaCallback;
+
+  QuotaBackendImpl(base::SequencedTaskRunner* file_task_runner,
+                   ObfuscatedFileUtil* obfuscated_file_util,
+                   FileSystemUsageCache* file_system_usage_cache,
+                   quota::QuotaManagerProxy* quota_manager_proxy);
+  virtual ~QuotaBackendImpl();
+
+  // QuotaReservationManager::QuotaBackend overrides.
+  virtual void ReserveQuota(
+      const GURL& origin,
+      FileSystemType type,
+      int64 delta,
+      const ReserveQuotaCallback& callback) OVERRIDE;
+  virtual void ReleaseReservedQuota(
+      const GURL& origin,
+      FileSystemType type,
+      int64 size) OVERRIDE;
+  virtual void CommitQuotaUsage(
+      const GURL& origin,
+      FileSystemType type,
+      int64 delta) OVERRIDE;
+  virtual void IncrementDirtyCount(
+      const GURL& origin,
+      FileSystemType type) OVERRIDE;
+  virtual void DecrementDirtyCount(
+      const GURL& origin,
+      FileSystemType type) OVERRIDE;
+
+ private:
+  friend class QuotaBackendImplTest;
+
+  struct QuotaReservationInfo {
+    QuotaReservationInfo(const GURL& origin, FileSystemType type, int64 delta);
+    ~QuotaReservationInfo();
+
+    GURL origin;
+    FileSystemType type;
+    int64 delta;
+  };
+
+  void DidGetUsageAndQuotaForReserveQuota(
+      const QuotaReservationInfo& info,
+      const ReserveQuotaCallback& callback,
+      quota::QuotaStatusCode status,
+      int64 usage,
+      int64 quota);
+
+  void ReserveQuotaInternal(
+      const QuotaReservationInfo& info);
+  base::PlatformFileError GetUsageCachePath(
+      const GURL& origin,
+      FileSystemType type,
+      base::FilePath* usage_file_path);
+
+  scoped_refptr<base::SequencedTaskRunner> file_task_runner_;
+
+  // Owned by SandboxFileSystemBackendDelegate.
+  ObfuscatedFileUtil* obfuscated_file_util_;
+  FileSystemUsageCache* file_system_usage_cache_;
+
+  scoped_refptr<quota::QuotaManagerProxy> quota_manager_proxy_;
+
+  base::WeakPtrFactory<QuotaBackendImpl> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(QuotaBackendImpl);
+};
+
+}  // namespace fileapi
+
+#endif  // WEBKIT_BROWSER_FILEAPI_QUOTA_QUOTA_BACKEND_IMPL_H_