public VolumeSnapshot LoadSnapshotRevision(VolumeSource source, VolumeSnapshotRevision revision)
{
if (mSnapshotDictionary.ContainsKey(revision))
{
return(mSnapshotDictionary[revision]);
}
else
{
XmlDocument doc = new XmlDocument();
doc.Load(GetRevisionFileName(revision));
XmlNode snapshotXmlNode = PWLib.XmlHelp.GetFirstChildWithName(doc, VolumeSnapshotXml.XmlSnapshotElement);
VolumeSnapshot snapshot = VolumeSnapshot.BuildFromXml(source, snapshotXmlNode);
mSnapshotDictionary.Add(revision, snapshot);
return(snapshot);
}
}
public VolumeSnapshot LoadSnapshotRevision(VolumeSource source, VolumeSnapshotRevision revision)
{
if (mSnapshotDictionary.ContainsKey(revision))
{
return(mSnapshotDictionary[revision]);
}
else
{
if (!mSnapshotXmlCache.ContainsKey(revision))
{
throw new Exception("Could not locate snapshot revision '" + revision.ToString() + "' in database");
}
string xmlFragment = mSnapshotXmlCache[revision];
XmlDocument doc = new XmlDocument();
doc.LoadXml(xmlFragment);
XmlNode snapshotXmlNode = PWLib.XmlHelp.GetFirstChildWithName(doc, VolumeSnapshotXml.XmlSnapshotElement);
VolumeSnapshot snapshot = VolumeSnapshot.BuildFromXml(source, snapshotXmlNode);
mSnapshotDictionary.Add(revision, snapshot);
return(snapshot);
}
}