Merge from Chromium at DEPS revision r205460
This commit was generated by merge_to_master.py.
Change-Id: I4a744a5e426bd3bb378d887cfa56fe054742a540
diff --git a/webkit/browser/dom_storage/dom_storage_namespace.h b/webkit/browser/dom_storage/dom_storage_namespace.h
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+++ b/webkit/browser/dom_storage/dom_storage_namespace.h
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+// 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_BROWSER_DOM_STORAGE_DOM_STORAGE_NAMESPACE_H_
+#define WEBKIT_BROWSER_DOM_STORAGE_DOM_STORAGE_NAMESPACE_H_
+
+#include <map>
+
+#include "base/basictypes.h"
+#include "base/files/file_path.h"
+#include "base/memory/ref_counted.h"
+#include "webkit/storage/webkit_storage_export.h"
+
+class GURL;
+
+namespace dom_storage {
+
+class DomStorageArea;
+class DomStorageTaskRunner;
+class SessionStorageDatabase;
+
+// Container for the set of per-origin Areas.
+// See class comments for DomStorageContext for a larger overview.
+class WEBKIT_STORAGE_EXPORT DomStorageNamespace
+ : public base::RefCountedThreadSafe<DomStorageNamespace> {
+ public:
+ // Option for PurgeMemory.
+ enum PurgeOption {
+ // Purge unopened areas only.
+ PURGE_UNOPENED,
+
+ // Purge aggressively, i.e. discard cache even for areas that have
+ // non-zero open count.
+ PURGE_AGGRESSIVE,
+ };
+
+ // Constructor for a LocalStorage namespace with id of 0
+ // and an optional backing directory on disk.
+ DomStorageNamespace(const base::FilePath& directory, // may be empty
+ DomStorageTaskRunner* task_runner);
+
+ // Constructor for a SessionStorage namespace with a non-zero id and an
+ // optional backing on disk via |session_storage_database| (may be NULL).
+ DomStorageNamespace(int64 namespace_id,
+ const std::string& persistent_namespace_id,
+ SessionStorageDatabase* session_storage_database,
+ DomStorageTaskRunner* task_runner);
+
+ int64 namespace_id() const { return namespace_id_; }
+ const std::string& persistent_namespace_id() const {
+ return persistent_namespace_id_;
+ }
+
+ // Returns the storage area for the given origin,
+ // creating instance if needed. Each call to open
+ // must be balanced with a call to CloseStorageArea.
+ DomStorageArea* OpenStorageArea(const GURL& origin);
+ void CloseStorageArea(DomStorageArea* area);
+
+ // Returns the area for |origin| if it's open, otherwise NULL.
+ DomStorageArea* GetOpenStorageArea(const GURL& origin);
+
+ // Creates a clone of |this| namespace including
+ // shallow copies of all contained areas.
+ // Should only be called for session storage namespaces.
+ DomStorageNamespace* Clone(int64 clone_namespace_id,
+ const std::string& clone_persistent_namespace_id);
+
+ void DeleteLocalStorageOrigin(const GURL& origin);
+ void DeleteSessionStorageOrigin(const GURL& origin);
+ void PurgeMemory(PurgeOption purge);
+ void Shutdown();
+
+ unsigned int CountInMemoryAreas() const;
+
+ private:
+ friend class base::RefCountedThreadSafe<DomStorageNamespace>;
+
+ // Struct to hold references to our contained areas and
+ // to keep track of how many tabs have a given area open.
+ struct AreaHolder {
+ scoped_refptr<DomStorageArea> area_;
+ int open_count_;
+ AreaHolder();
+ AreaHolder(DomStorageArea* area, int count);
+ ~AreaHolder();
+ };
+ typedef std::map<GURL, AreaHolder> AreaMap;
+
+ ~DomStorageNamespace();
+
+ // Returns a pointer to the area holder in our map or NULL.
+ AreaHolder* GetAreaHolder(const GURL& origin);
+
+ int64 namespace_id_;
+ std::string persistent_namespace_id_;
+ base::FilePath directory_;
+ AreaMap areas_;
+ scoped_refptr<DomStorageTaskRunner> task_runner_;
+ scoped_refptr<SessionStorageDatabase> session_storage_database_;
+};
+
+} // namespace dom_storage
+
+
+#endif // WEBKIT_BROWSER_DOM_STORAGE_DOM_STORAGE_NAMESPACE_H_