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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CONTENT_BROWSER_DOM_STORAGE_DOM_STORAGE_CONTEXT_WRAPPER_H_
      6 #define CONTENT_BROWSER_DOM_STORAGE_DOM_STORAGE_CONTEXT_WRAPPER_H_
      7 
      8 #include "base/memory/ref_counted.h"
      9 #include "content/common/content_export.h"
     10 #include "content/public/browser/dom_storage_context.h"
     11 
     12 namespace base {
     13 class FilePath;
     14 }
     15 
     16 namespace quota {
     17 class SpecialStoragePolicy;
     18 }
     19 
     20 namespace content {
     21 
     22 class DOMStorageContextImpl;
     23 
     24 // This is owned by BrowserContext (aka Profile) and encapsulates all
     25 // per-profile dom storage state.
     26 class CONTENT_EXPORT DOMStorageContextWrapper :
     27     NON_EXPORTED_BASE(public DOMStorageContext),
     28     public base::RefCountedThreadSafe<DOMStorageContextWrapper> {
     29  public:
     30   // If |data_path| is empty, nothing will be saved to disk.
     31   DOMStorageContextWrapper(const base::FilePath& data_path,
     32                         quota::SpecialStoragePolicy* special_storage_policy);
     33 
     34   // DOMStorageContext implementation.
     35   virtual void GetLocalStorageUsage(
     36       const GetLocalStorageUsageCallback& callback) OVERRIDE;
     37   virtual void GetSessionStorageUsage(
     38       const GetSessionStorageUsageCallback& callback) OVERRIDE;
     39   virtual void DeleteLocalStorage(const GURL& origin) OVERRIDE;
     40   virtual void DeleteSessionStorage(
     41       const SessionStorageUsageInfo& usage_info) OVERRIDE;
     42   virtual void SetSaveSessionStorageOnDisk() OVERRIDE;
     43   virtual scoped_refptr<SessionStorageNamespace>
     44       RecreateSessionStorage(const std::string& persistent_id) OVERRIDE;
     45   virtual void StartScavengingUnusedSessionStorage() OVERRIDE;
     46 
     47   // Called to free up memory that's not strictly needed.
     48   void PurgeMemory();
     49 
     50   // Used by content settings to alter the behavior around
     51   // what data to keep and what data to discard at shutdown.
     52   // The policy is not so straight forward to describe, see
     53   // the implementation for details.
     54   void SetForceKeepSessionState();
     55 
     56   // Called when the BrowserContext/Profile is going away.
     57   void Shutdown();
     58 
     59  private:
     60   friend class DOMStorageMessageFilter;  // for access to context()
     61   friend class SessionStorageNamespaceImpl;  // ditto
     62   friend class base::RefCountedThreadSafe<DOMStorageContextWrapper>;
     63 
     64   virtual ~DOMStorageContextWrapper();
     65   DOMStorageContextImpl* context() const { return context_.get(); }
     66 
     67   scoped_refptr<DOMStorageContextImpl> context_;
     68 
     69   DISALLOW_IMPLICIT_CONSTRUCTORS(DOMStorageContextWrapper);
     70 };
     71 
     72 }  // namespace content
     73 
     74 #endif  // CONTENT_BROWSER_DOM_STORAGE_DOM_STORAGE_CONTEXT_WRAPPER_H_
     75