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// Copyright 2023 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_RESOURCE_ATTRIBUTION_CPU_MEASUREMENT_DELEGATE_H_
#define COMPONENTS_PERFORMANCE_MANAGER_PUBLIC_RESOURCE_ATTRIBUTION_CPU_MEASUREMENT_DELEGATE_H_
#include <memory>
#include "base/process/process_metrics.h"
#include "base/time/time.h"
#include "base/types/expected.h"
namespace performance_manager {
class Graph;
class ProcessNode;
} // namespace performance_manager
namespace resource_attribution {
// A shim that Resource Attribution queries use to request CPU measurements for
// a process. A new CPUMeasurementDelegate object will be created for each
// ProcessNode to be measured. Public so that users of the API can inject a test
// override by passing a factory object to SetDelegateFactoryForTesting().
class CPUMeasurementDelegate {
public:
class Factory;
// Export ProcessCPUUsageError so callers don't need to include
// "base/process/process_metrics.h" for the definition.
using ProcessCPUUsageError = base::ProcessCPUUsageError;
// The given `factory` will be used to create a CPUMeasurementDelegate for
// each ProcessNode in `graph` to be measured. The factory object must outlive
// the graph. Usually it's owned by the test harness. nullptr will cause the
// factory returned by GetDefaultFactory() to be used.
static void SetDelegateFactoryForTesting(performance_manager::Graph* graph,
Factory* factory);
// Returns the default factory to use in production.
static Factory* GetDefaultFactory();
CPUMeasurementDelegate() = default;
virtual ~CPUMeasurementDelegate() = default;
// Requests CPU usage for the process. Should match the semantics of
// ProcessMetrics::GetCumulativeCPUUsage().
virtual base::expected<base::TimeDelta, ProcessCPUUsageError>
GetCumulativeCPUUsage() = 0;
};
class CPUMeasurementDelegate::Factory {
public:
virtual ~Factory() = default;
// Returns true iff a CPUMeasurementDelegate should be created for
// `process_node`. The production factory returns true to measure
// renderer processes with a valid (running) base::Process and a
// base::ProcessId assigned.
virtual bool ShouldMeasureProcess(
const performance_manager::ProcessNode* process_node) = 0;
// Creates a CPUMeasurementDelegate for `process_node`. This should only be
// called if ShouldMeasureProcess(process_node) returns true.
virtual std::unique_ptr<CPUMeasurementDelegate> CreateDelegateForProcess(
const performance_manager::ProcessNode* process_node) = 0;
};
} // namespace resource_attribution
#endif // COMPONENTS_PERFORMANCE_MANAGER_PUBLIC_RESOURCE_ATTRIBUTION_CPU_MEASUREMENT_DELEGATE_H_
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