gfx/layers/ipc/ActiveResource.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef MOZILLA_LAYERS_ACTIVERESOURCE
   8 #define MOZILLA_LAYERS_ACTIVERESOURCE
   9
  10 #include "nsExpirationTracker.h"
  11
  12 namespace mozilla::layers {
  13
  14 /**
  15  * See ActiveResourceTracker below.
  16  */
  17 class ActiveResource {
  18  public:
  19   virtual void NotifyInactive() = 0;
  20   nsExpirationState* GetExpirationState() { return &mExpirationState; }
  21   bool IsActivityTracked() { return mExpirationState.IsTracked(); }
  22
  23  private:
  24   nsExpirationState mExpirationState;
  25 };
  26
  27 /**
  28  * A convenience class on top of nsExpirationTracker
  29  */
  30 class ActiveResourceTracker final
  31     : public nsExpirationTracker<ActiveResource, 3> {
  32  public:
  33   ActiveResourceTracker(uint32_t aExpirationCycle, const char* aName,
  34                         nsIEventTarget* aEventTarget)
  35       : nsExpirationTracker(aExpirationCycle, aName, aEventTarget) {}
  36
  37   void NotifyExpired(ActiveResource* aResource) override {
  38     RemoveObject(aResource);
  39     aResource->NotifyInactive();
  40   }
  41 };
  42
  43 }  // namespace mozilla::layers
  44
  45 #endif