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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include <vector>
#include "mongo/executor/async_timer_interface.h"
#include "mongo/platform/mutex.h"
#include "mongo/stdx/unordered_set.h"
namespace mongo {
namespace executor {
/**
* Underlying mock timer implementation.
*
* If asyncWait() is called after the timer has expired, the provided callback will
* fire immediately.
*/
class AsyncTimerMockImpl {
public:
explicit AsyncTimerMockImpl(Milliseconds expiration);
/**
* Cancel operations waiting on this timer, invoking their handlers with an
* 'operation aborted' error code.
*/
void cancel();
/**
* Perform an asynchronous wait on this timer. If timer has expired, callback
* runs immediately, synchronously.
*/
void asyncWait(AsyncTimerInterface::Handler handler);
/**
* Advance current time. If the given interval is greater than or equal to the
* time left on the timer, expire and call callbacks now.
*/
void fastForward(Milliseconds time);
/**
* Return the amount of time left on this timer.
*/
Milliseconds timeLeft();
/**
* Reset the timer.
*/
void expireAfter(Milliseconds expiration);
/**
* Returns the number of handlers on this timer.
*/
int jobs();
private:
void _callAllHandlers(std::error_code ec);
Mutex _mutex = MONGO_MAKE_LATCH("AsyncTimerMockImpl::_mutex");
Milliseconds _timeLeft;
std::vector<AsyncTimerInterface::Handler> _handlers;
};
/**
* A wrapper around a shared AsyncTimerMockImpl that AsyncTimerMockFactory holds.
*
* This abstraction is necessary to fulfill ownership requirements on both
* sides of the factory: AsyncOp owns its AsyncTimerMock objects, and it can safely
* destroy these without destroying the underlying AsyncTimerMockImpl objects
* accessed by tests and introducing races.
*/
class AsyncTimerMock : public AsyncTimerInterface {
public:
AsyncTimerMock(std::shared_ptr<AsyncTimerMockImpl> timer);
void cancel() override;
void asyncWait(AsyncTimerInterface::Handler handler) override;
void expireAfter(Milliseconds expiration) override;
private:
// Unfortunate, but it makes the ownership model sane.
std::shared_ptr<AsyncTimerMockImpl> _timer;
};
/**
* A factory that returns mock timers to be used by tests.
*
* Shared pointers to timer impls are kept in a set here for access by tests,
* and these are also passed into the returned AsyncTimerMock objects.
*/
class AsyncTimerFactoryMock : public AsyncTimerFactoryInterface {
public:
AsyncTimerFactoryMock() = default;
/**
* Create and return a new AsyncTimerMock object.
*/
std::unique_ptr<AsyncTimerInterface> make(Milliseconds expiration) override;
/**
* Advance the current "time" and make stale timers expire.
*/
void fastForward(Milliseconds time);
/**
* This will start at 0ms since the epoch and increment when fastForward is called.
*/
Date_t now() override;
/**
* Returns the number of pending jobs across all timers.
*/
int jobs();
private:
stdx::recursive_mutex _timersMutex;
stdx::unordered_set<std::shared_ptr<AsyncTimerMockImpl>> _timers;
Milliseconds _curTime;
};
} // namespace executor
} // namespace mongo
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