62 lines
1.9 KiB
C
62 lines
1.9 KiB
C
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/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <chrono>
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#include <memory>
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#include <stdexcept>
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#include <folly/Executor.h>
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#include <folly/lang/Exception.h>
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namespace folly {
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// An executor that supports timed scheduling. Like RxScheduler.
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class ScheduledExecutor : public virtual Executor {
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public:
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// Reality is that better than millisecond resolution is very hard to
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// achieve. However, we reserve the right to be incredible.
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typedef std::chrono::microseconds Duration;
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typedef std::chrono::steady_clock::time_point TimePoint;
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~ScheduledExecutor() override = default;
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void add(Func) override = 0;
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/// Alias for add() (for Rx consistency)
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void schedule(Func&& a) {
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add(std::move(a));
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}
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/// Schedule a Func to be executed after dur time has elapsed
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/// Expect millisecond resolution at best.
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void schedule(Func&& a, Duration const& dur) {
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scheduleAt(std::move(a), now() + dur);
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}
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/// Schedule a Func to be executed at time t, or as soon afterward as
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/// possible. Expect millisecond resolution at best. Must be threadsafe.
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virtual void scheduleAt(Func&& /* a */, TimePoint const& /* t */) {
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throw_exception<std::logic_error>("unimplemented");
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}
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/// Get this executor's notion of time. Must be threadsafe.
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virtual TimePoint now() {
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return std::chrono::steady_clock::now();
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}
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};
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} // namespace folly
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