public static string GetSequencePrefix(IDataLayer dataLayer) {
if (dataLayer == null)
throw new ArgumentNullException("dataLayer");
lock (SyncRoot) {
if (dataLayerForCachedServerPrefix/*.Target*/ != dataLayer) {
using (var session = new Session(dataLayer)) {
var sid = session.GetObjectByKey<XpoServerId>(0);
if (sid == null) {
// we can throw exception here instead of creating random prefix
sid = new XpoServerId(session) {
SequencePrefix = XpoDefault.NewGuid().ToString()
};
try {
sid.Save();
} catch {
sid = session.GetObjectByKey<XpoServerId>(0, true);
if (sid == null)
throw;
}
}
cachedSequencePrefix = sid.SequencePrefix;
dataLayerForCachedServerPrefix = dataLayer;
// dataLayerForCachedServerPrefix.Target = dataLayer; <<< if WeakReference
}
}
return cachedSequencePrefix;
}
}
public static string GetSequencePrefix(IDataLayer dataLayer)
{
if (dataLayer == null)
{
throw new ArgumentNullException("dataLayer");
}
lock (SyncRoot) {
if (dataLayerForCachedServerPrefix /*.Target*/ != dataLayer)
{
using (var session = new Session(dataLayer)) {
var sid = session.GetObjectByKey <XpoServerId>(0);
if (sid == null)
{
// we can throw exception here instead of creating random prefix
sid = new XpoServerId(session)
{
SequencePrefix = XpoDefault.NewGuid().ToString()
};
try {
sid.Save();
} catch {
sid = session.GetObjectByKey <XpoServerId>(0, true);
if (sid == null)
{
throw;
}
}
}
cachedSequencePrefix = sid.SequencePrefix;
dataLayerForCachedServerPrefix = dataLayer;
// dataLayerForCachedServerPrefix.Target = dataLayer; <<< if WeakReference
}
}
return(cachedSequencePrefix);
}
}