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// Copyright 2022 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef GRPC_SRC_CORE_LIB_PROMISE_SLEEP_H
#define GRPC_SRC_CORE_LIB_PROMISE_SLEEP_H
#include <grpc/support/port_platform.h>
#include <atomic>
#include "y_absl/status/status.h"
#include <grpc/event_engine/event_engine.h>
#include <grpc/support/log.h>
#include "src/core/lib/gprpp/time.h"
#include "src/core/lib/promise/activity.h"
#include "src/core/lib/promise/poll.h"
namespace grpc_core {
// Promise that sleeps until a deadline and then finishes.
class Sleep final {
public:
explicit Sleep(Timestamp deadline);
~Sleep();
Sleep(const Sleep&) = delete;
Sleep& operator=(const Sleep&) = delete;
Sleep(Sleep&& other) noexcept : deadline_(other.deadline_) {
// Promises can be moved only until they're polled, and since we only create
// the closure when first polled we can assume it's nullptr here.
GPR_DEBUG_ASSERT(other.closure_ == nullptr);
};
Sleep& operator=(Sleep&& other) noexcept {
// Promises can be moved only until they're polled, and since we only create
// the closure when first polled we can assume it's nullptr here.
GPR_DEBUG_ASSERT(closure_ == nullptr);
GPR_DEBUG_ASSERT(other.closure_ == nullptr);
deadline_ = other.deadline_;
return *this;
};
Poll<y_absl::Status> operator()();
private:
class ActiveClosure final
: public grpc_event_engine::experimental::EventEngine::Closure {
public:
explicit ActiveClosure(Timestamp deadline);
void Run() override;
// After calling Cancel, it's no longer safe to access this object.
void Cancel();
bool HasRun() const;
private:
bool Unref();
Waker waker_;
// One ref dropped by Run(), the other by Cancel().
std::atomic<int> refs_{2};
grpc_event_engine::experimental::EventEngine::TaskHandle timer_handle_;
};
Timestamp deadline_;
ActiveClosure* closure_{nullptr};
};
} // namespace grpc_core
#endif // GRPC_SRC_CORE_LIB_PROMISE_SLEEP_H
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