| // 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_ |
| #pragma once |
| |
| #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 cach of the an |
| // 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); |
| |
| 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_ |