performance_manager/graph/worker_node_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 COMPONENTS_PERFORMANCE_MANAGER_GRAPH_WORKER_NODE_IMPL_H_
#define COMPONENTS_PERFORMANCE_MANAGER_GRAPH_WORKER_NODE_IMPL_H_

#include <memory>
#include <string>
#include <vector>

#include "base/containers/flat_set.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/util/type_safety/pass_key.h"
#include "components/performance_manager/graph/node_base.h"
#include "components/performance_manager/public/graph/worker_node.h"
#include "third_party/blink/public/common/tokens/tokens.h"
#include "url/gurl.h"

namespace performance_manager {

class FrameNodeImpl;
class ProcessNodeImpl;

namespace execution_context {
class ExecutionContextAccess;
}  // namespace execution_context

class WorkerNodeImpl
    : public PublicNodeImpl<WorkerNodeImpl, WorkerNode>,
      public TypedNodeBase<WorkerNodeImpl, WorkerNode, WorkerNodeObserver> {
 public:
  static const char kDefaultPriorityReason[];
  static constexpr NodeTypeEnum Type() { return NodeTypeEnum::kWorker; }

  WorkerNodeImpl(const std::string& browser_context_id,
                 WorkerType worker_type,
                 ProcessNodeImpl* process_node,
                 const blink::WorkerToken& worker_token);
  ~WorkerNodeImpl() override;

  // Invoked when a frame starts/stops being a client of this worker.
  void AddClientFrame(FrameNodeImpl* frame_node);
  void RemoveClientFrame(FrameNodeImpl* frame_node);

  // Invoked when a worker starts/stops being a client of this worker.
  void AddClientWorker(WorkerNodeImpl* worker_node);
  void RemoveClientWorker(WorkerNodeImpl* worker_node);

  // Sets the worker priority, and the reason behind it.
  void SetPriorityAndReason(const PriorityAndReason& priority_and_reason);

  // Invoked when the worker script was fetched and the final response URL is
  // available.
  void OnFinalResponseURLDetermined(const GURL& url);

  // Getters for const properties. These can be called from any thread.
  const std::string& browser_context_id() const;
  WorkerType worker_type() const;
  ProcessNodeImpl* process_node() const;
  const blink::WorkerToken& worker_token() const;

  // Getters for non-const properties. These are not thread safe.
  const GURL& url() const;
  const base::flat_set<FrameNodeImpl*>& client_frames() const;
  const base::flat_set<WorkerNodeImpl*>& client_workers() const;
  const base::flat_set<WorkerNodeImpl*>& child_workers() const;
  const PriorityAndReason& priority_and_reason() const;

  base::WeakPtr<WorkerNodeImpl> GetWeakPtr() {
    return weak_factory_.GetWeakPtr();
  }

  // Implementation details below this point.

  // Used by the ExecutionContextRegistry mechanism.
  std::unique_ptr<NodeAttachedData>* GetExecutionContextStorage(
      util::PassKey<execution_context::ExecutionContextAccess> key) {
    return &execution_context_;
  }

 private:
  friend class ExecutionContextPriorityAccess;
  friend class WorkerNodeImplDescriber;

  void OnJoiningGraph() override;
  void OnBeforeLeavingGraph() override;

  // WorkerNode: These are private so that users of the
  // impl use the private getters rather than the public interface.
  WorkerType GetWorkerType() const override;
  const std::string& GetBrowserContextID() const override;
  const ProcessNode* GetProcessNode() const override;
  const blink::WorkerToken& GetWorkerToken() const override;
  const GURL& GetURL() const override;
  const base::flat_set<const FrameNode*> GetClientFrames() const override;
  const base::flat_set<const WorkerNode*> GetClientWorkers() const override;
  const base::flat_set<const WorkerNode*> GetChildWorkers() const override;
  const PriorityAndReason& GetPriorityAndReason() const override;

  // Invoked when |worker_node| becomes a child of this worker.
  void AddChildWorker(WorkerNodeImpl* worker_node);
  void RemoveChildWorker(WorkerNodeImpl* worker_node);

  // The unique ID of the browser context that this worker belongs to.
  const std::string browser_context_id_;

  // The type of this worker.
  const WorkerType worker_type_;

  // The process in which this worker lives.
  ProcessNodeImpl* const process_node_;

  // A unique identifier shared with all representations of this worker across
  // content and blink. This token should only ever be sent between the browser
  // and the renderer hosting the worker. It should not be used to identify a
  // worker in browser-to-renderer control messages, but may be used to identify
  // a worker in informational messages going in either direction.
  const blink::WorkerToken worker_token_;

  // The URL of the worker script. This is the final response URL which takes
  // into account redirections. This is initially empty and it is set when
  // OnFinalResponseURLDetermined() is invoked.
  GURL url_;

  // Frames that are clients of this worker.
  base::flat_set<FrameNodeImpl*> client_frames_;

  // Other workers that are clients of this worker. See the declaration of
  // WorkerNode for a distinction between client workers and child workers.
  base::flat_set<WorkerNodeImpl*> client_workers_;

  // The child workers of this worker. See the declaration of WorkerNode for a
  // distinction between client workers and child workers.
  base::flat_set<WorkerNodeImpl*> child_workers_;

  // Worker priority information. Set via ExecutionContextPriorityDecorator.
  ObservedProperty::NotifiesOnlyOnChangesWithPreviousValue<
      PriorityAndReason,
      const PriorityAndReason&,
      &WorkerNodeObserver::OnPriorityAndReasonChanged>
      priority_and_reason_{PriorityAndReason(base::TaskPriority::LOWEST,
                                             kDefaultPriorityReason)};

  // Used by ExecutionContextRegistry mechanism.
  std::unique_ptr<NodeAttachedData> execution_context_;

  // Inline storage for ExecutionContextPriorityDecorator data.
  execution_context_priority::AcceptedVote accepted_vote_;

  base::WeakPtrFactory<WorkerNodeImpl> weak_factory_{this};

  DISALLOW_COPY_AND_ASSIGN(WorkerNodeImpl);
};

}  // namespace performance_manager

#endif  // COMPONENTS_PERFORMANCE_MANAGER_GRAPH_WORKER_NODE_IMPL_H_