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// 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 CONTENT_BROWSER_DOM_STORAGE_DOM_STORAGE_NAMESPACE_H_
#define CONTENT_BROWSER_DOM_STORAGE_DOM_STORAGE_NAMESPACE_H_
#include <stdint.h>
#include <map>
#include <string>
#include "base/files/file_path.h"
#include "base/memory/ref_counted.h"
#include "content/common/content_export.h"
#include "url/gurl.h"
namespace base {
namespace trace_event {
class ProcessMemoryDump;
}
}
namespace content {
class DOMStorageArea;
class DOMStorageTaskRunner;
class SessionStorageDatabase;
// Container for the set of per-origin Areas.
// See class comments for DOMStorageContextImpl for a larger overview.
class CONTENT_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_t namespace_id,
const std::string& persistent_namespace_id,
SessionStorageDatabase* session_storage_database,
DOMStorageTaskRunner* task_runner);
int64_t 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_t 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();
void Flush();
unsigned int CountInMemoryAreas() const;
// Adds memory statistics to |pmd| for chrome://tracing.
void OnMemoryDump(base::trace_event::ProcessMemoryDump* pmd);
void GetOriginsWithAreas(std::vector<GURL>* origins) 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(const AreaHolder& other);
~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_t namespace_id_;
std::string persistent_namespace_id_;
base::FilePath directory_;
AreaMap areas_;
scoped_refptr<DOMStorageTaskRunner> task_runner_;
scoped_refptr<SessionStorageDatabase> session_storage_database_;
};
} // namespace content
#endif // CONTENT_BROWSER_DOM_STORAGE_DOM_STORAGE_NAMESPACE_H_
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