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refs #581, #592 Make sure syncLoad checks if the next load would load the value, if it is not currently loading.

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Mathew Sutcliffe
2016-02-06 18:40:31 +00:00
parent 5a0db69415
commit a58dddfa19
3 changed files with 16 additions and 11 deletions
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7
src/blackmisc/datacache.h
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@@ -46,7 +46,8 @@ namespace BlackMisc
//! Get the state of the disk cache, and prepare to update any values which are out of date.
//! Return value can be converted to bool, false means update is not started (error, or already up-to-date).
//! \param timestamps Current in-memory timestamps, to be compared with the on-disk ones.
LockGuard beginUpdate(const QMap<QString, qint64> &timestamps);
//! \param updateUuid Whether to prepare for an actual update, or just interrograte whether one is needed.
LockGuard beginUpdate(const QMap<QString, qint64> &timestamps, bool updateUuid = true);
//! During update, writes a new revision file with new timestamps.
void writeNewRevision(const QMap<QString, qint64> &timestamps);
@@ -64,10 +65,10 @@ namespace BlackMisc
QSet<QString> keysWithNewerTimestamps() const;
//! During update, returns true if the on-disk timestamp of this key is newer than in-memory.
bool isNewerValueAvailable(const QString &key) const;
bool isNewerValueAvailable(const QString &key, qint64 timestamp);
//! Return a future which will be made ready when the value is loaded. Future is invalid if value is not loading.
std::future<CVariant> promiseLoadedValue(QObject *pageOwner, const QString &key);
std::future<CVariant> promiseLoadedValue(QObject *pageOwner, const QString &key, qint64 currentTimestamp);
//! Returns (by move) the container of promises to load values.
std::vector<std::tuple<QObject *, QString, std::promise<CVariant>>> loadedValuePromises();