Global Resource Coordinator: Basic service internals

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 "base/optional.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/interfaces/coordination_unit.mojom.h"
+#include "services/resource_coordinator/public/interfaces/coordination_unit_provider.mojom.h"
+#include "services/service_manager/public/cpp/connection.h"
+#include "services/service_manager/public/cpp/service_context_ref.h"
+
+namespace resource_coordinator {
+
+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;
+  void Duplicate(mojom::CoordinationUnitRequest request) override;
+  void AddChild(const CoordinationUnitID& child_id) override;
+  void SetPolicyCallback(mojom::PolicyCallbackPtr callback) override;
+
+ private:
+  bool AddChild(CoordinationUnitImpl* child);
+  void RemoveChild(CoordinationUnitImpl* child);
+  void AddParent(CoordinationUnitImpl* parent);
+  void RemoveParent(CoordinationUnitImpl* parent);
+  bool HasParent(CoordinationUnitImpl* unit);
+  bool HasChild(CoordinationUnitImpl* unit);
+
+  void RecalcPolicy();
+  void UnregisterPolicyCallback();
+
+  enum StateFlags : uint8_t {
+    TEST_STATE,
+    TAB_VISIBLE,
+    AUDIO_PLAYING,
+    NUM_STATE_FLAGS
+  };
+  bool SelfOrParentHasFlagSet(StateFlags state);
+
+  std::unique_ptr<service_manager::ServiceContextRef> service_ref_;
+  mojo::BindingSet<mojom::CoordinationUnit> bindings_;
+  CoordinationUnitID id_;
+  int64_t id_hash_;

[Primiano Tucci (use gerrit), 2017/04/06 18:09:46]

one thing that is not immediatley clear from this cl is what this hash is. maybe
add acomment?

[oystein (OOO til 10th of July), 2017/04/10 20:02:59]

Removed this, after adding the std::hash(CoordinationUnitID) operator. It'll
mean an additional hashing done in the destructor, but seems worth it for the
reduced code verbosity (and hey, memory).

+
+  std::set<CoordinationUnitImpl*> children_;
+  std::set<CoordinationUnitImpl*> parents_;
+
+  mojom::PolicyCallbackPtr policy_callback_;
+  mojom::PolicyPtr current_policy_;
+
+  base::Optional<bool> state_flags_[NUM_STATE_FLAGS];
+
+  DISALLOW_COPY_AND_ASSIGN(CoordinationUnitImpl);
+};
+
+}  // namespace resource_coordinator
+
+#endif  // SERVICES_RESOURCE_COORDINATOR_COORDINATION_UNIT_COORDINATION_UNIT_IMPL_H_