/// <summary>
/// If the key has been deserialized already, return the current object value we have on hand
/// for it. If it has not, then deserialize it from initial Redis input and add it to the base
/// collection.
/// </summary>
/// <param name="key">The desired Session key name</param>
/// <returns>The deserialized object at the key, or null if it does not exist.</returns>
protected object MemoizedDeserializeGet(string key)
{
object storedObj = null;
if (this.Items.TryGetValue(key, out storedObj))
{
if (storedObj is NotYetDeserializedPlaceholderValue)
{
string serializedData;
if (this.SerializedRawData.TryGetValue(key, out serializedData))
{
try
{
var placeholderReference = storedObj;
storedObj = this.cereal.DeserializeOne(serializedData);
// if we can't deserialize, storedObj will still be the placeholder and in that case it's
// as if the DeserializeOne method error'ed, so mark it as failed to deserialize
if (storedObj is NotYetDeserializedPlaceholderValue)
{
storedObj = null;
}
// Try to update the key to the deserialized object. If it fails, check to make sure that its
// not because it was already deserialized in another thread
if (!this.Items.TryUpdate(key, storedObj, placeholderReference))
{
// the update failed, this could be because the comparison value was different for the
// concurrentDictionary, so lets try fetching the value again
if (this.Items.TryGetValue(key, out storedObj))
{
// if it is not a placeholder, return the re-fetched object from the Items collection
if (!(storedObj is NotYetDeserializedPlaceholderValue))
{
return(storedObj);
}
}
}
}
catch (Exception e)
{
if (RedisSerializationConfig.SerializerExceptionLoggingDel != null)
{
RedisSerializationConfig.SerializerExceptionLoggingDel(e);
}
storedObj = null;
}
}
}
}
return(storedObj);
}