TimeoutQueue.h

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/*
 * Copyright 2011-present Facebook, Inc.
 *
 * 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 <cstdint>
#include <functional>

#include <boost/multi_index/indexed_by.hpp>
#include <boost/multi_index/member.hpp>
#include <boost/multi_index/ordered_index.hpp>
#include <boost/multi_index_container.hpp>

namespace folly {

class TimeoutQueue {
 public:
  typedef int64_t Id;
  typedef std::function<void(Id, int64_t)> Callback;

  TimeoutQueue() : nextId_(1) {}

  Id add(int64_t now, int64_t delay, Callback callback);

  Id addRepeating(int64_t now, int64_t interval, Callback callback);

  bool erase(Id id);

  int64_t runOnce(int64_t now) {
    return runInternal(now, true);
  }
  int64_t runLoop(int64_t now) {
    return runInternal(now, false);
  }

  int64_t nextExpiration() const;

 private:
  int64_t runInternal(int64_t now, bool runOnce);
  // noncopyable
  TimeoutQueue(const TimeoutQueue&) = delete;
  TimeoutQueue& operator=(const TimeoutQueue&) = delete;

  struct Event {
    Id id;
    int64_t expiration;
    int64_t repeatInterval;
    Callback callback;
  };

  typedef boost::multi_index_container<
      Event,
      boost::multi_index::indexed_by<
          boost::multi_index::ordered_unique<
              boost::multi_index::member<Event, Id, &Event::id>>,
          boost::multi_index::ordered_non_unique<
              boost::multi_index::member<Event, int64_t, &Event::expiration>>>>
      Set;

  enum {
    BY_ID = 0,
    BY_EXPIRATION = 1,
  };

  Set timeouts_;
  Id nextId_;
};

} // namespace folly