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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_DOM_STORAGE_DOM_STORAGE_CACHED_AREA_H_
#define WEBKIT_DOM_STORAGE_DOM_STORAGE_CACHED_AREA_H_
#include <map>
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "base/nullable_string16.h"
#include "googleurl/src/gurl.h"
namespace dom_storage {
class DomStorageMap;
class DomStorageProxy;
// Unlike the other classes in the dom_storage library, this one is intended
// for use in renderer processes. It maintains a complete cache of the
// origin's Map of key/value pairs for fast access. The cache is primed on
// first access and changes are written to the backend thru the |proxy|.
// Mutations originating in other processes are applied to the cache via
// the ApplyMutation method.
class DomStorageCachedArea : public base::RefCounted<DomStorageCachedArea> {
public:
DomStorageCachedArea(int64 namespace_id, const GURL& origin,
DomStorageProxy* proxy);
int64 namespace_id() const { return namespace_id_; }
const GURL& origin() const { return origin_; }
unsigned GetLength(int connection_id);
NullableString16 GetKey(int connection_id, unsigned index);
NullableString16 GetItem(int connection_id, const string16& key);
bool SetItem(int connection_id, const string16& key, const string16& value,
const GURL& page_url);
void RemoveItem(int connection_id, const string16& key,
const GURL& page_url);
void Clear(int connection_id, const GURL& page_url);
void ApplyMutation(const NullableString16& key,
const NullableString16& new_value);
size_t MemoryBytesUsedByCache() const;
private:
friend class DomStorageCachedAreaTest;
friend class base::RefCounted<DomStorageCachedArea>;
~DomStorageCachedArea();
// Primes the cache, loading all values for the area.
void Prime(int connection_id);
void PrimeIfNeeded(int connection_id) {
if (!map_)
Prime(connection_id);
}
// Resets the object back to its newly constructed state.
void Reset();
// Async completion callbacks for proxied operations.
// These are used to maintain cache consistency by preventing
// mutation events from other processes from overwriting local
// changes made after the mutation.
void OnLoadComplete(bool success);
void OnSetItemComplete(const string16& key, bool success);
void OnClearComplete(bool success);
void OnRemoveItemComplete(const string16& key, bool success);
bool should_ignore_key_mutation(const string16& key) const {
return ignore_key_mutations_.find(key) != ignore_key_mutations_.end();
}
bool ignore_all_mutations_;
std::map<string16, int> ignore_key_mutations_;
int64 namespace_id_;
GURL origin_;
scoped_refptr<DomStorageMap> map_;
scoped_refptr<DomStorageProxy> proxy_;
base::WeakPtrFactory<DomStorageCachedArea> weak_factory_;
};
} // namespace dom_storage
#endif // WEBKIT_DOM_STORAGE_DOM_STORAGE_CACHED_AREA_H_
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