public void Load(DataBusPropertyInfo propertyInfo, object message)
{
if (propertyInfo == null)
{
throw new ArgumentNullException("propertyInfo");
}
if (message == null)
{
throw new ArgumentNullException("message");
}
_log.Info(
"Loading databus property '{0}' on message of type '{1}'.",
propertyInfo.Name,
message.GetType().FullName);
IDataBusProperty propertyInstance = propertyInfo.GetPropertyInstance(message) as IDataBusProperty;
if (propertyInstance == null || !propertyInstance.HasValue)
{
_log.Warn(
String.Format(
"Databus property '{0}' on message of type '{1}' is null or doesn't have a value.",
propertyInfo.Name,
message.GetType().FullName));
return;
}
LoadValueFromDataBus(propertyInstance, propertyInfo);
}
private void LoadValueFromDataBus(IDataBusProperty propertyInstance, DataBusPropertyInfo propertyInfo)
{
if (String.IsNullOrWhiteSpace(propertyInstance.ClaimKey))
{
string errorMsg = String.Format("Claim key of databus property '{0}' is missing. We can't fetch anything from the databus if the claimkey is null or whitespace.", propertyInfo.Name);
_log.Error(errorMsg);
throw new DataBusPropertyLoadException(errorMsg);
}
using (new TransactionScope(_dataBusSettings.TransactionScope))
{
//todo remove file from databus?
using (Stream stream = _dataBus.Get(propertyInstance.ClaimKey, propertyInfo.IsCompressedProperty))
{
if (_dataBusSettings.IsChecksummingEnabled)
{
DoChecksumming(propertyInstance, propertyInfo, stream);
}
stream.Position = 0;
object obj = _dataBusSerializer.Deserialize(stream);
if (obj == null)
{
_log.Warn("Deserializing databus stream resulted in a null object.");
}
propertyInstance.SetValue(obj);
}
}
}
private void DoChecksumming(IDataBusProperty propertyInstance, DataBusPropertyInfo propertyInfo, Stream stream)
{
if (propertyInstance.Checksum == null)
{
_log.Warn(
"Can't perform checksum validation if the checksum of the databus property '{0}' is not provided by the sender.", propertyInfo.Name);
}
else
{
stream.Position = 0;
string actualChecksum = Checksum.GetSha256HashBuffered(stream);
_log.Info("SHA256 checksum of databus property '{0}' is '{1}'.", propertyInfo.Name, actualChecksum);
if (actualChecksum != propertyInstance.Checksum)
{
string errorMsg = String.Format(
"Databus property '{0}' checksum error. Expected checksum value '{1}' but actual checksum value is '{2}'.",
propertyInfo.Name,
propertyInstance.Checksum,
actualChecksum);
_log.Error(errorMsg);
throw new DataBusPropertyLoadException(errorMsg);
}
}
}
public void Offload(DataBusPropertyInfo propertyInfo, object message)
{
if (propertyInfo == null)
{
throw new ArgumentNullException("propertyInfo");
}
if (message == null)
{
throw new ArgumentNullException("message");
}
_log.Info(
"Offloading databus property '{0}' on message of type {1}.",
propertyInfo.Name,
message.GetType().FullName);
IDataBusProperty propertyInstance = propertyInfo.GetPropertyInstance(message) as IDataBusProperty;
if (propertyInstance == null)
{
_log.Warn(
String.Format(
"Databus property '{0}' on message of type '{1}'. is null.",
propertyInfo.Name,
message.GetType().FullName));
return;
}
object valueToPutOnBus = propertyInstance.GetValue();
if (valueToPutOnBus != null)
{
PutValueOnDataBus(propertyInstance, valueToPutOnBus, propertyInfo);
}
else
{
_log.Warn("Value of databus property '{0} ' is null.", propertyInfo.Name);
}
}
private void PutValueOnDataBus(IDataBusProperty propertyInstance, object valueToPutOnBus, DataBusPropertyInfo dataBusPropertyInfo)
{
propertyInstance.HasValue = true;
using (MemoryStream memoryStream = new MemoryStream())
{
_dataBusSerializer.Serialize(valueToPutOnBus, memoryStream);
if (_dataBusSettings.IsChecksummingEnabled)
{
memoryStream.Position = 0;
propertyInstance.Checksum = Checksum.GetSha256HashBuffered(memoryStream);
_log.Info("SHA256 checksum of databus property '{0}' is '{1}'.", dataBusPropertyInfo.Name, propertyInstance.Checksum);
}
string claimKey;
using (new TransactionScope(_dataBusSettings.TransactionScope))
{
memoryStream.Position = 0;
claimKey = _dataBus.Put(memoryStream, dataBusPropertyInfo.IsCompressedProperty);
}
if (String.IsNullOrWhiteSpace(claimKey))
{
string errorMsg = String.Format("The claimkey for databus property '{0}' returned by the databus is null or whitespace! You can't claim anything without a claim key.", dataBusPropertyInfo.Name);
_log.Error(errorMsg);
throw new DataBusPropertyOffoadException(errorMsg);
}
propertyInstance.ClaimKey = claimKey;
}
}
