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// Copyright 2024 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_RESOURCE_ATTRIBUTION_CONTEXT_COLLECTION_H_
#define COMPONENTS_PERFORMANCE_MANAGER_RESOURCE_ATTRIBUTION_CONTEXT_COLLECTION_H_
#include <bitset>
#include <set>
#include <variant>
#include "components/performance_manager/public/resource_attribution/resource_contexts.h"
namespace resource_attribution {
// A mixed collection of individual ResourceContext's and
// ResourceContextTypeId's.
//
// ResourceContextTypeId's are integers that map to specific context types (ie.
// alternatives in the ResourceContext variant). In this collection they
// represent "all contexts of the given type", which is a set that changes over
// time as contexts are created and deleted.
class ContextCollection {
public:
ContextCollection();
~ContextCollection();
ContextCollection(const ContextCollection& other);
ContextCollection& operator=(const ContextCollection& other);
friend bool operator==(const ContextCollection&,
const ContextCollection&) = default;
// Adds `context` to the collection.
void AddResourceContext(const ResourceContext& context);
// Adds `type_id` to the collection so that all contexts of that type will be
// implicitly included.
void AddAllContextsOfType(internal::ResourceContextTypeId type_id);
// Returns true iff the collection contains nothing.
bool IsEmpty() const;
// Returns true iff the collection contains `context`, either explicitly or
// because the collection tracks all contexts of its type.
bool ContainsContext(const ResourceContext& context) const;
static ContextCollection CreateForTesting(
std::set<ResourceContext> resource_contexts,
std::set<internal::ResourceContextTypeId> all_context_types);
private:
// Individual resource contexts to measure.
std::set<ResourceContext> resource_contexts_;
// A set of ResourceContextTypeId's (converted to int and stored in a bitset
// for efficiency). For each of these context types, all contexts that exist
// will be measured.
std::bitset<std::variant_size<ResourceContext>::value> all_context_types_;
};
} // namespace resource_attribution
#endif // COMPONENTS_PERFORMANCE_MANAGER_RESOURCE_ATTRIBUTION_CONTEXT_COLLECTION_H_
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