128 lines
3.1 KiB
C++
Executable File
128 lines
3.1 KiB
C++
Executable File
/*
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This is free and unencumbered software released into the public domain.
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Anyone is free to copy, modify, publish, use, compile, sell, or
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distribute this software, either in source code form or as a compiled
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binary, for any purpose, commercial or non-commercial, and by any
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means.
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In jurisdictions that recognize copyright laws, the author or authors
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of this software dedicate any and all copyright interest in the
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software to the public domain. We make this dedication for the benefit
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of the public at large and to the detriment of our heirs and
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successors. We intend this dedication to be an overt act of
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relinquishment in perpetuity of all present and future rights to this
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software under copyright law.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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For more information, please refer to <http://unlicense.org/>
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*/
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#include "promise.h"
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#include <QTimer>
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namespace LtsUtils
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{
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Promise::Promise(const std::function<void(ResultFunction resolve, ResultFunction reject)> &function, QObject *parent)
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: QObject(parent)
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, m_functionAlreadySet(false)
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, m_timeout(new QTimer(this))
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, m_resultSet(false)
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, m_timeoutSet(false)
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{
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m_timeout->setSingleShot(true);
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connect(m_timeout, &QTimer::timeout,
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this, &Promise::slotTimeout);
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setFunction(function);
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}
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void Promise::setFunction(const std::function<void(ResultFunction resolve, ResultFunction reject)> &function)
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{
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if (!function || m_functionAlreadySet)
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return;
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m_functionAlreadySet = true;
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if (m_timeoutSet)
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m_timeout->start();
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// run async (when back to event loop) - so there is enough time to set resolveFn & rejectFn
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QTimer::singleShot(0, this, [this, function]()
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{
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// call function from parameter, to resolve or reject this promise
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function([this](const QVariant &value)
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{ // function called resolve
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resolve(value);
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}, [this](const QVariant &value)
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{
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// function valled reject
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reject(value);
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});
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});
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}
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void Promise::setTimeout(int interval)
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{
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m_timeout->stop();
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m_timeout->setInterval(interval);
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m_timeoutSet = (interval != 0);
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if (interval != 0 && m_functionAlreadySet)
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m_timeout->start();
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}
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void Promise::slotTimeout()
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{
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reject(QStringLiteral("timeout"));
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}
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void Promise::resolve(const QVariant &value)
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{
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if (m_resultSet)
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return;
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m_resultSet = true;
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m_timeout->stop();
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m_resolveFn(value);
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}
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void Promise::reject(const QVariant &value)
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{
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if (m_resultSet)
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return;
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m_resultSet = true;
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m_timeout->stop();
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m_rejectFn(value);
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}
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Promise &Promise::resolved(ResultFunction resolveFn)
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{
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m_resolveFn = resolveFn;
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return *this;
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}
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Promise &Promise::rejected(ResultFunction rejectFn)
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{
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m_rejectFn = rejectFn;
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return *this;
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}
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} // namespace LtsUtils
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