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refs #659 Allow setting a "deferred" flag in data cache values, causing the value not to be loaded.

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This commit is contained in:
Mathew Sutcliffe
2016-05-26 20:03:13 +01:00
parent 4c08d1cc86
commit 29cea55bc9
2 changed files with 32 additions and 0 deletions
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13
src/blackmisc/datacache.h
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@@ -144,6 +144,9 @@ namespace BlackMisc
//! Set the flag which will cause the value to be pre-loaded.
void pinValue(const QString &key);
//! Set the flag which will cause the value to be deferred-loaded.
void deferValue(const QString &key);
private:
mutable QMutex m_mutex { QMutex::Recursive };
bool m_updateInProgress = false;
@@ -155,6 +158,7 @@ namespace BlackMisc
QMap<QString, qint64> m_timestamps;
QMap<QString, qint64> m_timesToLive;
QSet<QString> m_pinnedValues;
QSet<QString> m_deferredValues;
std::vector<std::promise<void>> m_promises;
static QJsonObject toJson(const QMap<QString, qint64> &timestamps);
@@ -235,6 +239,9 @@ namespace BlackMisc
//! Method used for implementing pinning values.
void pinValue(const QString &key);
//! Method used for implementing deferring values.
void deferValue(const QString &key);
private:
CDataCache();
@@ -273,6 +280,8 @@ namespace BlackMisc
{
if (Trait::timeToLive() >= 0) { CDataCache::instance()->setTimeToLive(Trait::key(), Trait::timeToLive()); }
if (Trait::isPinned()) { CDataCache::instance()->pinValue(Trait::key()); }
if (Trait::isDeferred()) { CDataCache::instance()->deferValue(Trait::key()); }
static_assert(! (Trait::isPinned() && Trait::isDeferred()), "trait can not be both pinned and deferred");
}
//! Reset the data to its default value.
@@ -334,6 +343,10 @@ namespace BlackMisc
//! Good for small, important values; bad for large ones.
static constexpr bool isPinned() { return false; }
//! If true, then value will not be loaded until it is explicitly admitted.
//! Good for large values the loading of which might depend on some other condition.
static constexpr bool isDeferred() { return false; }
//! Deleted default constructor.
CDataTrait() = delete;