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refs #601 Introduce "pinned" values, which are loaded synchronously by the CDataCache constructor.

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This commit is contained in:
Mathew Sutcliffe
2016-03-10 20:44:23 +00:00
parent c6a038aaa8
commit 259f8d7a68
2 changed files with 64 additions and 5 deletions
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20
src/blackmisc/datacache.h
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@@ -78,7 +78,8 @@ namespace BlackMisc
//! 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.
//! \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);
//! \param pinsOnly Only load pinned values.
LockGuard beginUpdate(const QMap<QString, qint64> &timestamps, bool updateUuid = true, bool pinsOnly = false);
//! During update, writes a new revision file with new timestamps.
void writeNewRevision(const QMap<QString, qint64> &timestamps);
@@ -110,6 +111,9 @@ namespace BlackMisc
//! Causes the new timestamp to be written to the revision file.
void overrideTimestamp(const QString &key, qint64 timestamp);
//! Set the flag which will cause the value to be pre-loaded.
void pinValue(const QString &key);
private:
mutable QMutex m_mutex { QMutex::Recursive };
bool m_updateInProgress = false;
@@ -120,10 +124,13 @@ namespace BlackMisc
QUuid m_uuid;
QMap<QString, qint64> m_timestamps;
QMap<QString, qint64> m_timesToLive;
QSet<QString> m_pinnedValues;
std::vector<std::promise<void>> m_promises;
static QJsonObject toJson(const QMap<QString, qint64> &timestamps);
static QMap<QString, qint64> fromJson(const QJsonObject &timestamps);
static QJsonArray toJson(const QSet<QString> &pins);
static QSet<QString> fromJson(const QJsonArray &pins);
};
/*!
@@ -145,8 +152,9 @@ namespace BlackMisc
//! Also called by saveToStore, to ensure that remote changes to unrelated values are not lost.
//! \param baseline A snapshot of the currently loaded values, taken when the load is queued.
//! \param defer Whether to defer applying the changes. Used when called by saveToStore.
//! \param pinsOnly Only load pinned values.
//! \return Usually ignored, but can be held in order to retain the revision file lock.
CDataCacheRevision::LockGuard loadFromStore(const BlackMisc::CValueCachePacket &baseline, bool defer = false);
CDataCacheRevision::LockGuard loadFromStore(const BlackMisc::CValueCachePacket &baseline, bool defer = false, bool pinsOnly = false);
signals:
//! Signal back to the cache when values have been loaded.
@@ -194,6 +202,9 @@ namespace BlackMisc
//! Method used for implementing timestamp renewal.
void renewTimestamp(const QString &key, qint64 timestamp);
//! Method used for implementing pinning values.
void pinValue(const QString &key);
private:
CDataCache();
@@ -231,6 +242,7 @@ namespace BlackMisc
CData::CCached(CDataCache::instance(), Trait::key(), Trait::isValid, Trait::defaultValue(), owner, slot)
{
if (Trait::timeToLive() >= 0) { CDataCache::instance()->setTimeToLive(Trait::key(), Trait::timeToLive()); }
if (Trait::isPinned()) { CDataCache::instance()->pinValue(Trait::key()); }
}
//! Reset the data to its default value.
@@ -282,6 +294,10 @@ namespace BlackMisc
//! Default is -1 which means value never becomes stale.
static int timeToLive() { return -1; }
//! If true, then value will be synchronously loaded when CDataCache is constructed.
//! Good for small, important values; bad for large ones.
static bool isPinned() { return false; }
//! Deleted default constructor.
CDataTrait() = delete;