chrome/browser/profiles/profile_destroyer.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 CHROME_BROWSER_PROFILES_PROFILE_DESTROYER_H_
   6 #define CHROME_BROWSER_PROFILES_PROFILE_DESTROYER_H_
   7
   8 #include <set>
   9
  10 #include "base/memory/ref_counted.h"
  11 #include "base/timer/timer.h"
  12 #include "content/public/browser/render_process_host_observer.h"
  13
  14 class Profile;
  15
  16 namespace content {
  17 class RenderProcessHost;
  18 }
  19
  20 // We use this class to destroy the off the record profile so that we can make
  21 // sure it gets done asynchronously after all render process hosts are gone.
  22 class ProfileDestroyer : public content::RenderProcessHostObserver {
  23  public:
  24   static void DestroyProfileWhenAppropriate(Profile* const profile);
  25   static void DestroyOffTheRecordProfileNow(Profile* const profile);
  26
  27  private:
  28   typedef std::set<content::RenderProcessHost*> HostSet;
  29   typedef std::set<ProfileDestroyer*> DestroyerSet;
  30
  31   friend class base::RefCounted<ProfileDestroyer>;
  32
  33   ProfileDestroyer(Profile* const profile, HostSet* hosts);
  34   virtual ~ProfileDestroyer();
  35
  36   // content::RenderProcessHostObserver override.
  37   virtual void RenderProcessHostDestroyed(
  38       content::RenderProcessHost* host) OVERRIDE;
  39
  40   // Called by the timer to cancel the pending destruction and do it now.
  41   void DestroyProfile();
  42
  43   // Fetch the list of render process hosts that still refer to the profile.
  44   // Return true if we found at least one, false otherwise.
  45   static bool GetHostsForProfile(Profile* const profile, HostSet* hosts);
  46
  47   // We need access to all pending destroyers so we can cancel them.
  48   static DestroyerSet* pending_destroyers_;
  49
  50   // We don't want to wait forever, so we have a cancellation timer.
  51   base::Timer timer_;
  52
  53   // Used to count down the number of render process host left.
  54   uint32 num_hosts_;
  55
  56   // The profile being destroyed. If it is set to NULL, it is a signal from
  57   // another instance of ProfileDestroyer that this instance is canceled.
  58   Profile* profile_;
  59
  60   base::WeakPtrFactory<ProfileDestroyer> weak_ptr_factory_;
  61
  62   DISALLOW_COPY_AND_ASSIGN(ProfileDestroyer);
  63 };
  64
  65 #endif  // CHROME_BROWSER_PROFILES_PROFILE_DESTROYER_H_