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refs #756 Allow to mark data cache traits with a session flag, so they are overwritten when starting a new session.

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(Starting a new session means, that a swift application is started when no other swift application is running.)
This commit is contained in:
Mathew Sutcliffe
2016-10-12 13:34:15 +01:00
parent a08c93d53a
commit 64315e1022
2 changed files with 97 additions and 1 deletions
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25
src/blackmisc/datacache.h
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@@ -39,6 +39,7 @@
#include <QtDebug>
#include <QtGlobal>
#include <future>
#include <memory>
#include <utility>
#include <vector>
@@ -85,7 +86,10 @@ namespace BlackMisc
{
public:
//! Construct the single instance of the revision metastate.
CDataCacheRevision(const QString &basename) : m_basename(basename) {}
CDataCacheRevision(const QString &basename);
//! Destructor.
~CDataCacheRevision();
//! Non-copyable.
//! @{
@@ -155,6 +159,12 @@ namespace BlackMisc
//! Set the flag which will cause a deferred-load value to be loaded.
void admitValue(const QString &key);
//! Set the flag which will cause a value to be reset when starting a new session.
void sessionValue(const QString &key);
//! True if the current update is the first of a new session.
bool isNewSession() const;
private:
mutable QMutex m_mutex { QMutex::Recursive };
bool m_updateInProgress = false;
@@ -170,8 +180,12 @@ namespace BlackMisc
QSet<QString> m_deferredValues;
QSet<QString> m_admittedValues;
QSet<QString> m_admittedQueue;
QSet<QString> m_sessionValues;
std::vector<std::promise<void>> m_promises;
class Session;
std::unique_ptr<Session> m_session;
static QJsonObject toJson(const QMap<QString, qint64> &timestamps);
static QMap<QString, qint64> fromJson(const QJsonObject &timestamps);
static QJsonArray toJson(const QSet<QString> &pins);
@@ -262,6 +276,9 @@ namespace BlackMisc
//! Method used for implementing deferring values.
void admitValue(const QString &key, bool triggerLoad);
//! Method used for implementing session values.
void sessionValue(const QString &key);
private:
CDataCache();
@@ -295,6 +312,7 @@ namespace BlackMisc
if (Trait::timeToLive() >= 0) { CDataCache::instance()->setTimeToLive(this->getKey(), Trait::timeToLive()); }
if (Trait::isPinned()) { CDataCache::instance()->pinValue(this->getKey()); }
if (Trait::isDeferred()) { CDataCache::instance()->deferValue(this->getKey()); }
if (Trait::isSession()) { CDataCache::instance()->sessionValue(this->getKey()); }
static_assert(! (Trait::isPinned() && Trait::isDeferred()), "trait can not be both pinned and deferred");
}
@@ -420,6 +438,11 @@ namespace BlackMisc
//! Good for large values the loading of which might depend on some other condition.
static constexpr bool isDeferred() { return false; }
//! If true, then upon starting an application, value will be overwritten with the default
//! if there are no other applications currently using the cache. In effect, the value
//! is retained only while there are applications using the cache.
static constexpr bool isSession() { return false; }
//! Deleted default constructor.
TDataTrait() = delete;