content/browser/dom_storage/dom_storage_context_impl.h

   1 // Copyright (c) 2012 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_IMPL_H_
   6 #define CONTENT_BROWSER_DOM_STORAGE_DOM_STORAGE_CONTEXT_IMPL_H_
   7
   8 #include "base/memory/ref_counted.h"
   9 #include "content/public/browser/dom_storage_context.h"
  10
  11 namespace base {
  12 class FilePath;
  13 }
  14
  15 namespace dom_storage {
  16 class DomStorageContext;
  17 }
  18
  19 namespace quota {
  20 class SpecialStoragePolicy;
  21 }
  22
  23 namespace content {
  24
  25 // This is owned by BrowserContext (aka Profile) and encapsulates all
  26 // per-profile dom storage state.
  27 class CONTENT_EXPORT DOMStorageContextImpl :
  28     NON_EXPORTED_BASE(public DOMStorageContext),
  29     public base::RefCountedThreadSafe<DOMStorageContextImpl> {
  30  public:
  31   // If |data_path| is empty, nothing will be saved to disk.
  32   DOMStorageContextImpl(const base::FilePath& data_path,
  33                         quota::SpecialStoragePolicy* special_storage_policy);
  34
  35   // DOMStorageContext implementation.
  36   virtual void GetLocalStorageUsage(
  37       const GetLocalStorageUsageCallback& callback) OVERRIDE;
  38   virtual void GetSessionStorageUsage(
  39       const GetSessionStorageUsageCallback& callback) OVERRIDE;
  40   virtual void DeleteLocalStorage(const GURL& origin) OVERRIDE;
  41   virtual void DeleteSessionStorage(
  42       const dom_storage::SessionStorageUsageInfo& usage_info) OVERRIDE;
  43   virtual void SetSaveSessionStorageOnDisk() OVERRIDE;
  44   virtual scoped_refptr<SessionStorageNamespace>
  45       RecreateSessionStorage(const std::string& persistent_id) OVERRIDE;
  46   virtual void StartScavengingUnusedSessionStorage() OVERRIDE;
  47
  48   // Called to free up memory that's not strictly needed.
  49   void PurgeMemory();
  50
  51   // Used by content settings to alter the behavior around
  52   // what data to keep and what data to discard at shutdown.
  53   // The policy is not so straight forward to describe, see
  54   // the implementation for details.
  55   void SetForceKeepSessionState();
  56
  57   // Called when the BrowserContext/Profile is going away.
  58   void Shutdown();
  59
  60  private:
  61   friend class DOMStorageMessageFilter;  // for access to context()
  62   friend class SessionStorageNamespaceImpl;  // ditto
  63   friend class base::RefCountedThreadSafe<DOMStorageContextImpl>;
  64
  65   virtual ~DOMStorageContextImpl();
  66   dom_storage::DomStorageContext* context() const { return context_.get(); }
  67
  68   scoped_refptr<dom_storage::DomStorageContext> context_;
  69
  70   DISALLOW_IMPLICIT_CONSTRUCTORS(DOMStorageContextImpl);
  71 };
  72
  73 }  // namespace content
  74
  75 #endif  // CONTENT_BROWSER_DOM_STORAGE_DOM_STORAGE_CONTEXT_IMPL_H_