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refs #659 Add the method CData::admit() which causes a value with deferred loading to be loaded.

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This commit is contained in:
Mathew Sutcliffe
2016-05-26 20:22:13 +01:00
parent 29cea55bc9
commit f1a9ae5a13
2 changed files with 33 additions and 1 deletions
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19
src/blackmisc/datacache.h
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@@ -147,6 +147,9 @@ namespace BlackMisc
//! Set the flag which will cause the value to be deferred-loaded.
void deferValue(const QString &key);
//! Set the flag which will cause a deferred-load value to be loaded.
void admitValue(const QString &key);
private:
mutable QMutex m_mutex { QMutex::Recursive };
bool m_updateInProgress = false;
@@ -159,6 +162,7 @@ namespace BlackMisc
QMap<QString, qint64> m_timesToLive;
QSet<QString> m_pinnedValues;
QSet<QString> m_deferredValues;
QSet<QString> m_admittedValues;
std::vector<std::promise<void>> m_promises;
static QJsonObject toJson(const QMap<QString, qint64> &timestamps);
@@ -242,6 +246,9 @@ namespace BlackMisc
//! Method used for implementing deferring values.
void deferValue(const QString &key);
//! Method used for implementing deferring values.
void admitValue(const QString &key, bool triggerLoad);
private:
CDataCache();
@@ -284,6 +291,13 @@ namespace BlackMisc
static_assert(! (Trait::isPinned() && Trait::isDeferred()), "trait can not be both pinned and deferred");
}
//! \copydoc BlackMisc::CCached::set
CStatusMessage set(const typename Trait::type &value, qint64 timestamp = 0)
{
CDataCache::instance()->admitValue(Trait::key(), false);
return CCached<typename Trait::type>::set(value, timestamp);
}
//! Reset the data to its default value.
void setDefault() { this->set(Trait::defaultValue()); }
@@ -296,12 +310,17 @@ namespace BlackMisc
//! Don't change the value, but write a new timestamp, to extend the life of the value.
void renewTimestamp(qint64 timestamp) { return CDataCache::instance()->renewTimestamp(this->getKey(), timestamp); }
//! If the value is load-deferred, trigger the deferred load (async).
void admit() { CDataCache::instance()->admitValue(Trait::key(), true); }
//! If the value is currently being loaded, wait for it to finish loading, and call the notification slot, if any.
void synchronize()
{
auto *queue = this->m_page.template findChild<Private::CDataPageQueue *>();
Q_ASSERT(queue);
admit();
CDataCache::instance()->synchronize(this->getKey());
CDataCache::instance()->synchronize(this->getKey()); // if load was in progress when admit() was called, synchronize with the next load
queue->setQueuedValueFromCache(this->getKey());
}