chromium/components/performance_manager/public/graph/graph.h

// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef COMPONENTS_PERFORMANCE_MANAGER_PUBLIC_GRAPH_GRAPH_H_
#define COMPONENTS_PERFORMANCE_MANAGER_PUBLIC_GRAPH_GRAPH_H_

#include <cstdint>
#include <memory>
#include <unordered_set>

#include "base/dcheck_is_on.h"
#include "base/memory/ptr_util.h"
#include "base/memory/raw_ptr.h"
#include "base/observer_list_types.h"
#include "base/sequence_checker.h"
#include "components/performance_manager/public/graph/node_set_view.h"

namespace ukm {
class UkmRecorder;
}  // namespace ukm

namespace performance_manager {

class GraphOwned;
class GraphRegistered;
class FrameNode;
class FrameNodeObserver;
class InitializingFrameNodeObserver;
class NodeDataDescriberRegistry;
class PageNode;
class PageNodeObserver;
class ProcessNode;
class ProcessNodeObserver;
class SystemNode;
class SystemNodeObserver;
class WorkerNode;
class WorkerNodeObserver;

template <typename DerivedType>
class GraphRegisteredImpl;

// Represents a graph of the nodes representing a single browser. Maintains a
// set of nodes that can be retrieved in different ways, some indexed. Keeps
// a list of observers that are notified of node addition and removal.
class Graph { … };

#if DCHECK_IS_ON()
#define DCHECK_ON_GRAPH_SEQUENCE(graph) …
#else
// Compiles to a nop, and will eat ostream input.
#define DCHECK_ON_GRAPH_SEQUENCE …
#endif

// Helper class for passing ownership of objects to a graph.
class GraphOwned { … };

// A default implementation of GraphOwned.
class GraphOwnedDefaultImpl : public GraphOwned { … };

}  // namespace performance_manager

#endif  // COMPONENTS_PERFORMANCE_MANAGER_PUBLIC_GRAPH_GRAPH_H_