TimeWheel.h

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// Copyright 2024 libsese
//
// 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 <sese/Config.h>
 
#include <list>
#include <functional>
 
namespace sese {
 
struct TimeoutEvent {
    using Callback = std::function<void()>;
 
    int64_t range{};
    int64_t target{};
    bool repeat{false};
    Callback callback{};
};
 
struct TimeoutEventSlot {
    std::list<TimeoutEvent *> events{};
    TimeoutEventSlot *next{nullptr};
};
 
class  TimeWheel {
public:
    TimeWheel();
 
    virtual ~TimeWheel();
 
    TimeoutEvent *delay(
            const TimeoutEvent::Callback &callback,
            int64_t seconds,
            bool repeat = false
    );
 
    void cancel(TimeoutEvent *event);
 
    void check();
 
protected:
    static int64_t getTimestamp();
 
    int64_t startTime{};
    int64_t lastCheckTime{};
    TimeoutEventSlot slots[60]{};
};
 
} // namespace sese