| 1 | // Copyright (C) 2016 The Qt Company Ltd. |
|---|---|
| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
| 3 | |
| 4 | #ifndef QFUTURESYNCHRONIZER_H |
| 5 | #define QFUTURESYNCHRONIZER_H |
| 6 | |
| 7 | #include <QtCore/qfuture.h> |
| 8 | |
| 9 | QT_REQUIRE_CONFIG(future); |
| 10 | |
| 11 | QT_BEGIN_NAMESPACE |
| 12 | |
| 13 | |
| 14 | template <typename T> |
| 15 | class QFutureSynchronizer |
| 16 | { |
| 17 | Q_DISABLE_COPY(QFutureSynchronizer) |
| 18 | |
| 19 | public: |
| 20 | Q_NODISCARD_CTOR QFutureSynchronizer() : m_cancelOnWait(false) { } |
| 21 | Q_NODISCARD_CTOR |
| 22 | explicit QFutureSynchronizer(QFuture<T> future) |
| 23 | : m_cancelOnWait(false) |
| 24 | { addFuture(future: std::move(future)); } |
| 25 | ~QFutureSynchronizer() { waitForFinished(); } |
| 26 | |
| 27 | void setFuture(QFuture<T> future) |
| 28 | { |
| 29 | waitForFinished(); |
| 30 | m_futures.clear(); |
| 31 | addFuture(future: std::move(future)); |
| 32 | } |
| 33 | |
| 34 | void addFuture(QFuture<T> future) |
| 35 | { |
| 36 | m_futures.append(std::move(future)); |
| 37 | } |
| 38 | |
| 39 | void waitForFinished() |
| 40 | { |
| 41 | if (m_cancelOnWait) { |
| 42 | for (int i = 0; i < m_futures.size(); ++i) { |
| 43 | m_futures[i].cancel(); |
| 44 | } |
| 45 | } |
| 46 | |
| 47 | for (int i = 0; i < m_futures.size(); ++i) { |
| 48 | m_futures[i].waitForFinished(); |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | void clearFutures() |
| 53 | { |
| 54 | m_futures.clear(); |
| 55 | } |
| 56 | |
| 57 | QList<QFuture<T> > futures() const |
| 58 | { |
| 59 | return m_futures; |
| 60 | } |
| 61 | |
| 62 | void setCancelOnWait(bool enabled) |
| 63 | { |
| 64 | m_cancelOnWait = enabled; |
| 65 | } |
| 66 | |
| 67 | bool cancelOnWait() const |
| 68 | { |
| 69 | return m_cancelOnWait; |
| 70 | } |
| 71 | |
| 72 | protected: |
| 73 | QList<QFuture<T>> m_futures; |
| 74 | bool m_cancelOnWait; |
| 75 | }; |
| 76 | |
| 77 | QT_END_NAMESPACE |
| 78 | |
| 79 | #endif // QFUTURESYNCHRONIZER_H |
| 80 |