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// Copyright 2020 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_EXECUTION_CONTEXT_EXECUTION_CONTEXT_REGISTRY_H_
#define COMPONENTS_PERFORMANCE_MANAGER_PUBLIC_EXECUTION_CONTEXT_EXECUTION_CONTEXT_REGISTRY_H_
#include "components/performance_manager/public/graph/frame_node.h"
#include "components/performance_manager/public/graph/worker_node.h"
#include "third_party/blink/public/common/tokens/tokens.h"
namespace performance_manager {
class Graph;
namespace execution_context {
class ExecutionContext;
class ExecutionContextObserver;
// The ExecutionContextRegistry is a per-graph class that allows for observers
// to be registered, and for ExecutionContexts to be looked up by their tokens.
// An instance of the registry must be passed to the Graph prior to any nodes
// being created.
class ExecutionContextRegistry {
public:
ExecutionContextRegistry();
ExecutionContextRegistry(const ExecutionContextRegistry&) = delete;
ExecutionContextRegistry& operator=(const ExecutionContextRegistry&) = delete;
virtual ~ExecutionContextRegistry();
// Returns the instance of the ExecutionContextRegistry for the given
// Graph.
static ExecutionContextRegistry* GetFromGraph(Graph* graph);
// Returns the ExecutionContext associated with a node.
static const ExecutionContext* GetExecutionContextForFrameNode(
const FrameNode* frame_node);
static const ExecutionContext* GetExecutionContextForWorkerNode(
const WorkerNode* worker_node);
// Adds an observer to the registry. The observer needs to be removed before
// the registry is torn down.
virtual void AddObserver(ExecutionContextObserver* observer) = 0;
// Determines if an observer is in the registry.
virtual bool HasObserver(ExecutionContextObserver* observer) const = 0;
// Removes an observer from the registry.
virtual void RemoveObserver(ExecutionContextObserver* observer) = 0;
// Looks up an ExecutionContext by token. Returns nullptr if no such context
// exists.
virtual const ExecutionContext* GetExecutionContextByToken(
const blink::ExecutionContextToken& token) = 0;
// Does a typed lookup of a FrameNode ExecutionContext by FrameToken, returns
// nullptr if no such FrameNode exists.
virtual const FrameNode* GetFrameNodeByFrameToken(
const blink::LocalFrameToken& token) = 0;
// Does a typed lookup of a WorkerNode ExecutionContext by its DevToolsToken,
// returns nullptr if no such WorkerNode exists.
virtual const WorkerNode* GetWorkerNodeByWorkerToken(
const blink::WorkerToken& token) = 0;
// Returns the ExecutionContext associated with a node. These provide
// implementations for the static functions above, which should be preferred.
virtual const ExecutionContext* GetExecutionContextForFrameNodeImpl(
const FrameNode* frame_node) = 0;
virtual const ExecutionContext* GetExecutionContextForWorkerNodeImpl(
const WorkerNode* worker_node) = 0;
};
} // namespace execution_context
} // namespace performance_manager
#endif // COMPONENTS_PERFORMANCE_MANAGER_PUBLIC_EXECUTION_CONTEXT_EXECUTION_CONTEXT_REGISTRY_H_
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