/// <summary>
/// Queries the saga index for an instance with the given <paramref name="sagaDataType"/> with a
/// a property named <paramref name="propertyName"/> and the value <paramref name="propertyValue"/>
/// </summary>
public async Task<ISagaData> Find(Type sagaDataType, string propertyName, object propertyValue)
{
if (sagaDataType == null) throw new ArgumentNullException(nameof(sagaDataType));
if (propertyName == null) throw new ArgumentNullException(nameof(propertyName));
if (propertyValue == null) throw new ArgumentNullException(nameof(propertyValue));
using (var connection = await _connectionProvider.GetConnection())
{
using (var command = connection.CreateCommand())
{
if (propertyName.Equals(IdPropertyName, StringComparison.OrdinalIgnoreCase))
{
command.CommandText = $@"SELECT TOP 1 [data] FROM {_dataTableName.QualifiedName} WHERE [id] = @value";
}
else
{
command.CommandText =
$@"
SELECT TOP 1 [saga].[data] AS 'data' FROM {_dataTableName.QualifiedName} [saga]
JOIN {_indexTableName.QualifiedName} [index] ON [saga].[id] = [index].[saga_id]
WHERE [index].[saga_type] = @saga_type
AND [index].[key] = @key
AND [index].[value] = @value
";
var sagaTypeName = GetSagaTypeName(sagaDataType);
command.Parameters.Add("key", SqlDbType.NVarChar, propertyName.Length).Value = propertyName;
command.Parameters.Add("saga_type", SqlDbType.NVarChar, sagaTypeName.Length).Value = sagaTypeName;
}
var correlationPropertyValue = GetCorrelationPropertyValue(propertyValue);
command.Parameters.Add("value", SqlDbType.NVarChar, correlationPropertyValue.Length).Value = correlationPropertyValue;
using (var reader = await command.ExecuteReaderAsync())
{
if (!await reader.ReadAsync()) return null;
var value = GetData(reader);
try
{
var sagaData = (ISagaData)ObjectSerializer.DeserializeFromString(value);
if (!sagaDataType.IsInstanceOfType(sagaData))
{
return null;
}
return sagaData;
}
catch (Exception exception)
{
throw new RebusApplicationException(exception, $"An error occurred while attempting to deserialize '{value}' into a {sagaDataType}");
}
}
}
}
}
internal static T Get <T>(this IMessageContext messageContext, string key) where T : class
{
if (messageContext.Headers.ContainsKey(key) == false)
{
return(null);
}
var messageString = messageContext.Headers[key];
var data = m_objectSerializer.DeserializeFromString(messageString);
if (data is T dataTyped)
{
return(dataTyped);
}
return(null);
}