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// Copyright 2018 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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCHEDULER_WORKER_WORKER_SCHEDULER_PROXY_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCHEDULER_WORKER_WORKER_SCHEDULER_PROXY_H_
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "base/optional.h"
#include "base/single_thread_task_runner.h"
#include "base/threading/thread_checker.h"
#include "services/metrics/public/cpp/ukm_source_id.h"
#include "services/service_manager/public/cpp/connector.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/scheduler/main_thread/frame_origin_type.h"
#include "third_party/blink/renderer/platform/scheduler/public/frame_or_worker_scheduler.h"
#include "third_party/blink/renderer/platform/scheduler/renderer/frame_status.h"
#include "third_party/blink/renderer/platform/wtf/wtf.h"
namespace blink {
namespace scheduler {
class WorkerScheduler;
// Helper class for communication between parent scheduler (may be a frame
// scheduler on the main thread or another woker scheduler on a worker thread)
// and worker scheduler (worker thread).
//
// It's owned by DedicatedWorkerThread and is created and destroyed
// on the parent thread. It's passed to WorkerScheduler during its
// construction. Given that DedicatedWorkerThread object outlives worker thread,
// this class outlives worker thread too.
class PLATFORM_EXPORT WorkerSchedulerProxy
: public FrameOrWorkerScheduler::Observer {
public:
explicit WorkerSchedulerProxy(FrameOrWorkerScheduler* scheduler);
~WorkerSchedulerProxy() override;
void OnWorkerSchedulerCreated(
base::WeakPtr<WorkerScheduler> worker_scheduler);
void OnLifecycleStateChanged(
SchedulingLifecycleState lifecycle_state) override;
// Accessed only during init.
SchedulingLifecycleState lifecycle_state() const {
DCHECK(!initialized_);
return lifecycle_state_;
}
// Accessed only during init.
base::Optional<FrameOriginType> parent_frame_type() const {
DCHECK(!initialized_);
return parent_frame_type_;
}
// Accessed only during init.
ukm::SourceId ukm_source_id() const {
DCHECK(!initialized_);
return ukm_source_id_;
}
// Accessed only during init.
std::unique_ptr<service_manager::Connector> TakeConnector() {
DCHECK(!initialized_);
#if DCHECK_IS_ON()
DCHECK(!connector_taken_);
connector_taken_ = true;
#endif
return std::move(connector_);
}
// Accessed only during init.
FrameStatus initial_frame_status() const {
DCHECK(!initialized_);
return initial_frame_status_;
}
private:
// Can be accessed only from the worker thread.
base::WeakPtr<WorkerScheduler> worker_scheduler_;
// Const after init on the worker thread.
scoped_refptr<base::SingleThreadTaskRunner> worker_thread_task_runner_;
SchedulingLifecycleState lifecycle_state_ =
SchedulingLifecycleState::kNotThrottled;
std::unique_ptr<FrameOrWorkerScheduler::LifecycleObserverHandle>
throttling_observer_handle_;
bool initialized_ = false;
base::Optional<FrameOriginType> parent_frame_type_;
FrameStatus initial_frame_status_ = FrameStatus::kNone;
ukm::SourceId ukm_source_id_ = ukm::kInvalidSourceId;
std::unique_ptr<service_manager::Connector> connector_;
#if DCHECK_IS_ON()
bool connector_taken_ = false;
#endif
THREAD_CHECKER(parent_thread_checker_);
DISALLOW_COPY_AND_ASSIGN(WorkerSchedulerProxy);
};
} // namespace scheduler
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCHEDULER_WORKER_WORKER_SCHEDULER_PROXY_H_
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