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From Philip Barr <>
Subject FW: DotCMIS XmlElement Deserialisation Very Slow
Date Fri, 27 Sep 2013 16:45:48 GMT
Resent as a mail, don't know why I "posted" this...or if it makes any difference.

From: Philip Barr
Posted At: 27 September 2013 17:20
Posted To: Apache Chemistry
Conversation: DotCMIS XmlElement Deserialisation Very Slow
Subject: DotCMIS XmlElement Deserialisation Very Slow

Hi all,

The following method in converter.cs, line 112, currently creates  a new XmlSerialiser for
each invocation. This is very costly and when there are, for example, lots of Choice elements
in an aspect (which is how I noticed it, performance slipped to 16-17 seconds for an ISession.GetTypeDefinition()

T DeserializeElement<T>(XmlElement element)

I think this should be changed to the following:
        private static readonly Dictionary<Type, XmlSerializer> xmlSerializerCache =
new Dictionary<Type, XmlSerializer>();

        /// <summary>
        /// Deserializes an elemenet.
        /// </summary>
        private static T DeserializeElement<T>(XmlElement element)
            if (!xmlSerializerCache.ContainsKey(typeof(T)))
                XmlRootAttribute xmlRoot = new XmlRootAttribute(element.LocalName);
                xmlRoot.Namespace = CMISNamespaceURI;
                XmlSerializer xmlSerializer = new XmlSerializer(typeof(T), xmlRoot);
                xmlSerializerCache.Add(typeof(T), xmlSerializer);

            T deserializeElement = (T)xmlSerializerCache[typeof(T)].Deserialize(new XmlNodeReader(element));

            return deserializeElement;

Doing this sped things up significantly for me.


Philip Barr | Head Of Development | SynApps Solutions Ltd<>.
mobile: +44 (0)7817556362 | skype: phil.barr


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