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ScheduledExecutor.h
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/
ScheduledExecutor.h
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/*
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* 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.
*/
#pragma once
#include <chrono>
#include <memory>
#include <stdexcept>
#include <folly/Executor.h>
#include <folly/lang/Exception.h>
namespace folly {
// An executor that supports timed scheduling. Like RxScheduler.
class ScheduledExecutor : public virtual Executor {
public:
// Reality is that better than millisecond resolution is very hard to
// achieve. However, we reserve the right to be incredible.
typedef std::chrono::microseconds Duration;
typedef std::chrono::steady_clock::time_point TimePoint;
~ScheduledExecutor() override = default;
void add(Func) override = 0;
/// Alias for add() (for Rx consistency)
void schedule(Func&& a) { add(std::move(a)); }
/// Schedule a Func to be executed after dur time has elapsed
/// Expect millisecond resolution at best.
void schedule(Func&& a, Duration const& dur) {
scheduleAt(std::move(a), now() + dur);
}
/// Schedule a Func to be executed at time t, or as soon afterward as
/// possible. Expect millisecond resolution at best. Must be threadsafe.
virtual void scheduleAt(Func&& /* a */, TimePoint const& /* t */) {
throw_exception<std::logic_error>("unimplemented");
}
/// Get this executor's notion of time. Must be threadsafe.
virtual TimePoint now() { return std::chrono::steady_clock::now(); }
};
} // namespace folly