| // Copyright 2017 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_RESOURCE_COORDINATOR_LIFECYCLE_UNIT_SOURCE_BASE_H_ |
| #define CHROME_BROWSER_RESOURCE_COORDINATOR_LIFECYCLE_UNIT_SOURCE_BASE_H_ |
| |
| #include "base/macros.h" |
| #include "base/observer_list.h" |
| #include "chrome/browser/resource_coordinator/lifecycle_unit_source.h" |
| |
| namespace resource_coordinator { |
| |
| class LifecycleUnitBase; |
| |
| // Base class for a class that creates and destroys LifecycleUnits. |
| class LifecycleUnitSourceBase : public LifecycleUnitSource { |
| public: |
| LifecycleUnitSourceBase(); |
| ~LifecycleUnitSourceBase() override; |
| |
| // LifecycleUnitSource: |
| void AddObserver(LifecycleUnitSourceObserver* observer) override; |
| void RemoveObserver(LifecycleUnitSourceObserver* observer) override; |
| |
| size_t lifecycle_unit_count() const { return lifecycle_unit_count_; } |
| |
| protected: |
| friend class LifecycleUnitBase; |
| |
| // Called by LifecycleUnitBase when a new one is created. Used to update |
| // |lifecycle_unit_count|. Note that the |lifecycle_unit| will be half built |
| // at this point so not usable. |
| void NotifyLifecycleUnitBeingCreated(LifecycleUnitBase* lifecycle_unit); |
| |
| // Intended to be called by the a concrete LifecycleUnitSourceBase |
| // implementation. This dispatches the creation event to registered |
| // observers. |
| void NotifyLifecycleUnitCreated(LifecycleUnitBase* lifecycle_unit); |
| |
| // Called by LifecycleUnitBase when it is being torn down. Used to update |
| // |lifecycle_unit_count|. Note that the |lifecycle_unit| will be half torn |
| // down at this point so not usable. |
| void NotifyLifecycleUnitBeingDestroyed(LifecycleUnitBase* lifecycle_unit); |
| |
| // Called when a first lifecycle unit comes into being. This is an empty stub |
| // which can optionally be overridden by derived classes. |
| virtual void OnFirstLifecycleUnitCreated(); |
| |
| // Called when all lifecycle units belonging to this source have been |
| // destroyed. This is an empty stub which can optionally be overridden by |
| // derived classes. |
| virtual void OnAllLifecycleUnitsDestroyed(); |
| |
| private: |
| // Observers notified when a LifecycleUnit is created. |
| base::ObserverList<LifecycleUnitSourceObserver>::Unchecked observers_; |
| |
| // The count of lifecycle units associated with this source. |
| size_t lifecycle_unit_count_ = 0; |
| |
| DISALLOW_COPY_AND_ASSIGN(LifecycleUnitSourceBase); |
| }; |
| |
| } // namespace resource_coordinator |
| |
| #endif // CHROME_BROWSER_RESOURCE_COORDINATOR_LIFECYCLE_UNIT_SOURCE_BASE_H_ |