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// Copyright (c) 2009 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 CHROME_BROWSER_IN_PROCESS_WEBKIT_DOM_STORAGE_CONTEXT_H_
#define CHROME_BROWSER_IN_PROCESS_WEBKIT_DOM_STORAGE_CONTEXT_H_
#include "base/file_path.h"
#include "base/hash_tables.h"
#include "chrome/browser/in_process_webkit/dom_storage_dispatcher_host.h"
class StorageArea;
class StorageNamespace;
class WebKitContext;
// This is owned by WebKitContext and is all the dom storage information that's
// shared by all the ResourceMessageFilter/DOMStorageDispatcherHosts that share
// the same profile. The specifics of responsibilities are fairly well
// documented here and in StorageNamespace and StorageArea. Everything is only
// to be accessed on the WebKit thread unless noted otherwise.
class DOMStorageContext {
public:
explicit DOMStorageContext(WebKitContext* webkit_context);
~DOMStorageContext();
// Get the local storage instance. The pointer is owned by this class.
StorageNamespace* LocalStorage();
// Get a new session storage namespace (but it's still owned by this class).
StorageNamespace* NewSessionStorage();
// Allocate a new storage ___ id.
int64 AllocateStorageAreaId() { return ++last_storage_area_id_; }
int64 AllocateStorageNamespaceId() { return ++last_storage_namespace_id_; }
// Various storage area methods. The storage area is owned by one of the
// namespaces that's owned by this class.
void RegisterStorageArea(StorageArea* storage_area);
void UnregisterStorageArea(StorageArea* storage_area);
StorageArea* GetStorageArea(int64 id);
// Get a namespace from an id. What's returned is owned by this class. The
// caller of GetStorageNamespace must immediately register itself with the
// returned StorageNamespace.
void RegisterStorageNamespace(StorageNamespace* storage_namespace);
void UnregisterStorageNamespace(StorageNamespace* storage_namespace);
StorageNamespace* GetStorageNamespace(int64 id);
// Sometimes an event from one DOM storage dispatcher host requires
// communication to all of them.
typedef base::hash_set<DOMStorageDispatcherHost*> DispatcherHostSet;
void RegisterDispatcherHost(DOMStorageDispatcherHost* dispatcher_host);
void UnregisterDispatcherHost(DOMStorageDispatcherHost* dispatcher_host);
const DispatcherHostSet* GetDispatcherHostSet() const;
// The special ID used for local storage.
static const int64 kLocalStorageNamespaceId = 0;
private:
// The last used storage_area_id and storage_namespace_id's.
static const int64 kFirstStorageAreaId = 1;
int64 last_storage_area_id_;
static const int64 kFirstStorageNamespaceId = 1;
int64 last_storage_namespace_id_;
// We're owned by this WebKit context. Used while instantiating LocalStorage.
WebKitContext* webkit_context_;
// All the DOMStorageDispatcherHosts that are attached to us. ONLY USE ON THE
// IO THREAD!
DispatcherHostSet dispatcher_host_set_;
// Maps ids to StorageAreas. We do NOT own these objects. StorageNamespace
// (which does own them) will notify us when we should remove the entries.
typedef base::hash_map<int64, StorageArea*> StorageAreaMap;
StorageAreaMap storage_area_map_;
// Maps ids to StorageNamespaces. We own these objects.
typedef base::hash_map<int64, StorageNamespace*> StorageNamespaceMap;
StorageNamespaceMap storage_namespace_map_;
DISALLOW_IMPLICIT_CONSTRUCTORS(DOMStorageContext);
};
#endif // CHROME_BROWSER_IN_PROCESS_WEBKIT_DOM_STORAGE_CONTEXT_H_
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