mirror of
https://github.com/ecency/ecency-mobile.git
synced 2024-12-18 02:41:39 +03:00
129 lines
3.7 KiB
C++
129 lines
3.7 KiB
C++
/*
|
|
* Copyright 2016 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.
|
|
*/
|
|
|
|
/**
|
|
* Simple timeout queue. Call user-specified callbacks when their timeouts
|
|
* expire.
|
|
*
|
|
* This class assumes that "time" is an int64_t and doesn't care about time
|
|
* units (seconds, milliseconds, etc). You call runOnce() / runLoop() using
|
|
* the same time units that you use to specify callbacks.
|
|
*
|
|
* @author Tudor Bosman (tudorb@fb.com)
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <stdint.h>
|
|
#include <functional>
|
|
#include <boost/multi_index_container.hpp>
|
|
#include <boost/multi_index/indexed_by.hpp>
|
|
#include <boost/multi_index/ordered_index.hpp>
|
|
#include <boost/multi_index/member.hpp>
|
|
|
|
namespace folly {
|
|
|
|
class TimeoutQueue {
|
|
public:
|
|
typedef int64_t Id;
|
|
typedef std::function<void(Id, int64_t)> Callback;
|
|
|
|
TimeoutQueue() : nextId_(1) { }
|
|
|
|
/**
|
|
* Add a one-time timeout event that will fire "delay" time units from "now"
|
|
* (that is, the first time that run*() is called with a time value >= now
|
|
* + delay).
|
|
*/
|
|
Id add(int64_t now, int64_t delay, Callback callback);
|
|
|
|
/**
|
|
* Add a repeating timeout event that will fire every "interval" time units
|
|
* (it will first fire when run*() is called with a time value >=
|
|
* now + interval).
|
|
*
|
|
* run*() will always invoke each repeating event at most once, even if
|
|
* more than one "interval" period has passed.
|
|
*/
|
|
Id addRepeating(int64_t now, int64_t interval, Callback callback);
|
|
|
|
/**
|
|
* Erase a given timeout event, returns true if the event was actually
|
|
* erased and false if it didn't exist in our queue.
|
|
*/
|
|
bool erase(Id id);
|
|
|
|
/**
|
|
* Process all events that are due at times <= "now" by calling their
|
|
* callbacks.
|
|
*
|
|
* Callbacks are allowed to call back into the queue and add / erase events;
|
|
* they might create more events that are already due. In this case,
|
|
* runOnce() will only go through the queue once, and return a "next
|
|
* expiration" time in the past or present (<= now); runLoop()
|
|
* will process the queue again, until there are no events already due.
|
|
*
|
|
* Note that it is then possible for runLoop to never return if
|
|
* callbacks re-add themselves to the queue (or if you have repeating
|
|
* callbacks with an interval of 0).
|
|
*
|
|
* Return the time that the next event will be due (same as
|
|
* nextExpiration(), below)
|
|
*/
|
|
int64_t runOnce(int64_t now) { return runInternal(now, true); }
|
|
int64_t runLoop(int64_t now) { return runInternal(now, false); }
|
|
|
|
/**
|
|
* Return the time that the next event will be due.
|
|
*/
|
|
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
|