[GRC] Coordination Unit Graph Observer

services/resource_coordinator/coordination_unit/coordination_unit_impl.h

 // 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 SERVICES_RESOURCE_COORDINATOR_COORDINATION_UNIT_COORDINATION_UNIT_IMPL_H_
 #define SERVICES_RESOURCE_COORDINATOR_COORDINATION_UNIT_COORDINATION_UNIT_IMPL_H_
 
 #include <list>
+#include <map>
 #include <memory>
 #include <set>
 #include <unordered_map>
 #include <utility>
+#include <vector>
 
+#include "base/callback.h"
+#include "base/observer_list.h"
 #include "base/optional.h"
 #include "base/values.h"
 #include "mojo/public/cpp/bindings/binding_set.h"
 #include "mojo/public/cpp/bindings/interface_request.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
 #include "services/resource_coordinator/public/cpp/coordination_unit_id.h"
+#include "services/resource_coordinator/public/cpp/coordination_unit_types.h"
 #include "services/resource_coordinator/public/interfaces/coordination_unit.mojom.h"
 #include "services/resource_coordinator/public/interfaces/coordination_unit_provider.mojom.h"
 #include "services/service_manager/public/cpp/service_context_ref.h"
 
 namespace resource_coordinator {
 
+class CoordinationUnitGraphObserver;
+
 class CoordinationUnitImpl : public mojom::CoordinationUnit {
  public:
   CoordinationUnitImpl(
       const CoordinationUnitID& id,
       std::unique_ptr<service_manager::ServiceContextRef> service_ref);
   ~CoordinationUnitImpl() override;
 
   // Overridden from mojom::CoordinationUnit:
   void SendEvent(mojom::EventPtr event) override;
   void GetID(const GetIDCallback& callback) override;
@@ skipping 12 matching lines @@
     return property_store_;
   }
 
   static const double kCPUUsageMinimumForTesting;
   static const double kCPUUsageUnmeasuredForTesting;
   virtual double GetCPUUsageForTesting();
 
   // Clear property from internal key-value store
   void ClearProperty(mojom::PropertyType property);
   // Retrieve property from internal key-value store
-  base::Value GetProperty(mojom::PropertyType property);
+  base::Value GetProperty(mojom::PropertyType property) const;
   // Set property from internal key-value store
   void SetProperty(mojom::PropertyType property, base::Value value);
 
+  void WillBeDestroyed();
+  void AddObserver(CoordinationUnitGraphObserver* observer);
+  void RemoveObserver(CoordinationUnitGraphObserver* observer);
+
  protected:
   const CoordinationUnitID id_;
   std::set<CoordinationUnitImpl*> children_;
   std::set<CoordinationUnitImpl*> parents_;
 
  private:
   bool AddChild(CoordinationUnitImpl* child);
   bool RemoveChild(CoordinationUnitImpl* child);
   void AddParent(CoordinationUnitImpl* parent);
   void RemoveParent(CoordinationUnitImpl* parent);
@@ skipping 13 matching lines @@
     kNumStateFlags
   };
   bool SelfOrParentHasFlagSet(StateFlags state);
 
   std::unique_ptr<service_manager::ServiceContextRef> service_ref_;
   mojo::BindingSet<mojom::CoordinationUnit> bindings_;
 
   mojom::CoordinationPolicyCallbackPtr policy_callback_;
   mojom::CoordinationPolicyPtr current_policy_;
 
+  base::ObserverList<CoordinationUnitGraphObserver> observers_;
+
   base::Optional<bool> state_flags_[kNumStateFlags];
 
   DISALLOW_COPY_AND_ASSIGN(CoordinationUnitImpl);
 };
 
 }  // namespace resource_coordinator
 
 #endif  // SERVICES_RESOURCE_COORDINATOR_COORDINATION_UNIT_COORDINATION_UNIT_IMPL_H_