/// <summary>
/// Check to see whether the result of a persistence operation
/// was successful, raise appropriate exceptions if not.
/// </summary>
/// <param name="dbCommand">
/// <see cref="DbCommand" /> to retrieve result information from.
/// </param>
/// <param name="resultParameter">
/// Name of the parameter storing the result.
/// </param>
/// <param name="instanceParameter">
/// Name of the parameter storing the instance identifier.
/// </param>
private void CheckResult(DbCommand dbCommand, String resultParameter, String instanceParameter)
{
Int32?result = _valueReader.GetNullableInt32(dbCommand, resultParameter);
Guid instanceId = _valueReader.GetGuid(dbCommand, instanceParameter);
switch (result)
{
case _ownershipError:
// ownership error
throw new WorkflowOwnershipException(instanceId);
case _instanceNotFoundError:
// workflow could not be found
PersistenceException e = new PersistenceException(RM.Get_Error_InstanceCouldNotBeLoaded(instanceId));
e.Data["WorkflowNotFound"] = true;
throw e;
}
}
/// <summary>
/// Retrieve instance state from the persistence store.
/// </summary>
/// <param name="instanceId"></param>
/// <param name="ownerId"></param>
/// <param name="ownedUntil"></param>
/// <returns></returns>
public byte[] RetrieveInstanceState(Guid instanceId, Guid ownerId, DateTime ownedUntil)
{
byte[] instanceState = null;
using (DbCommand dbCommand = CreateCommand(nameResolver.ResolveCommandName(PersistenceCommandName.RetrieveInstanceState), CommandType.StoredProcedure))
{
string instanceParameter = nameResolver.ResolveParameterName(
PersistenceCommandName.InsertInstanceState,
PersistenceParameterName.InstanceId);
string resultParameter = nameResolver.ResolveParameterName(
PersistenceCommandName.InsertInstanceState,
PersistenceParameterName.Result);
AddParameter(dbCommand, instanceParameter, instanceId, AdoDbType.Guid);
AddParameter(dbCommand, nameResolver.ResolveParameterName(
PersistenceCommandName.RetrieveInstanceState,
PersistenceParameterName.OwnerId), ownerId, AdoDbType.Guid);
AddParameter(dbCommand, nameResolver.ResolveParameterName(
PersistenceCommandName.RetrieveInstanceState,
PersistenceParameterName.OwnedUntil), ownedUntil, AdoDbType.DateTime);
AddParameter(dbCommand, resultParameter,
AdoDbType.Int32, ParameterDirection.Output);
AddParameter(dbCommand, nameResolver.ResolveParameterName(
PersistenceCommandName.RetrieveInstanceState,
PersistenceParameterName.CurrentOwnerId), AdoDbType.Guid,
ParameterDirection.Output);
AddParameter(dbCommand, nameResolver.ResolveParameterName(
PersistenceCommandName.RetrieveInstanceState,
PersistenceParameterName.State), AdoDbType.Cursor,
ParameterDirection.Output);
int?result;
using (IDataReader dataReader = dbCommand.ExecuteReader())
{
if (dataReader.Read())
{
instanceState = (byte[])valueReader.GetValue(dataReader, 0);
}
result = valueReader.GetNullableInt32(dbCommand, resultParameter);
}
if (instanceState == null && result > 0)
{
// workflow could not be found
PersistenceException e = new PersistenceException(
RM.Get_Error_InstanceCouldNotBeLoaded(instanceId));
e.Data["WorkflowNotFound"] = true;
WfLogHelper.WriteLog("检索实例状态 public byte[] RetrieveInstanceState(" + instanceId + ", " + ownerId + ", " + ownedUntil + ")发生异常:" + e.ToString());
throw e;
}
else
{
checkResult(dbCommand, resultParameter, instanceParameter);
}
}
return(instanceState);
}
