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refs #494 Using CValueCachePacket, cache values are given timestamps.

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This commit is contained in:
Mathew Sutcliffe
2015-10-22 22:37:45 +01:00
parent eb11b69c6d
commit 966eed9044
13 changed files with 99 additions and 64 deletions
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21
src/blackmisc/valuecache.h
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@@ -92,10 +92,14 @@ namespace BlackMisc
//! \threadsafe
BlackMisc::CVariantMap getAllValues(const QString &keyPrefix = {}) const;
//! Return map containing all values in the cache, and timestamps when they were modified.
//! \threadsafe
BlackMisc::CValueCachePacket getAllValuesWithTimestamps(const QString &keyPrefix = {}) const;
//! Add some values to the cache.
//! Values already in the cache will remain in the cache unless they are overwritten.
//! \threadsafe
void insertValues(const BlackMisc::CVariantMap &values);
void insertValues(const BlackMisc::CValueCachePacket &values);
//! Save values in Json format.
//! If prefix is provided then only those values whose keys start with that prefix.
@@ -131,20 +135,20 @@ namespace BlackMisc
//! \see BlackMisc::CValueCache::valuesChangedByLocal.
//! \param values The values that were changed.
//! \param originator Identifier of the process which made the change. Can be this very process, or a different one.
void changeValuesFromRemote(const BlackMisc::CVariantMap &values, const BlackMisc::CIdentifier &originator);
void changeValuesFromRemote(const BlackMisc::CValueCachePacket &values, const BlackMisc::CIdentifier &originator);
signals:
//! Emitted when values in the cache are changed by an object in this very process.
//! The interprocess communication (e.g. DBus) should arrange for this signal to call the slot changeValueFromRemote
//! of CValueCache instances in all processes including this one. The slot will do its own round-trip detection.
void valuesChangedByLocal(const BlackMisc::CVariantMap &values);
void valuesChangedByLocal(const BlackMisc::CValueCachePacket &values);
protected:
//! Save specific values to Json files in a given directory.
CStatusMessage saveToFiles(const QString &directory, const CVariantMap &values) const;
//! Load from Json files in a given directory any values which differ from the current ones, and insert them in o_values.
CStatusMessage loadFromFiles(const QString &directory, CVariantMap &o_values) const;
CStatusMessage loadFromFiles(const QString &directory, CValueCachePacket &o_values) const;
//! Mutex protecting operations which are critical on m_elements.
mutable QMutex m_mutex { QMutex::Recursive };
@@ -158,14 +162,14 @@ namespace BlackMisc
Element &getElement(const QString &key);
Element &getElement(const QString &key, QMap<QString, ElementPtr>::const_iterator pos);
CVariant getValue(const QString &key);
std::pair<CVariant, qint64> getValue(const QString &key);
signals:
//! \private
void valuesChanged(const BlackMisc::CVariantMap &values, QObject *changedBy);
void valuesChanged(const BlackMisc::CValueCachePacket &values, QObject *changedBy);
private slots:
void changeValues(const BlackMisc::CVariantMap &values);
void changeValues(const BlackMisc::CValueCachePacket &values);
};
/*!
@@ -211,6 +215,9 @@ namespace BlackMisc
//! Write a new value. Must be called from the thread in which the owner lives.
CStatusMessage set(const T &value) { return m_page.setValue(m_element, CVariant::from(value)); }
//! Return the time when this value was updated.
QDateTime getTimestamp() const { return m_page.getTimestamp(m_element); }
//! Deleted copy constructor.
CCached(const CCached &) = delete;