/// <summary>
/// Retrieves a <see cref="IContainSagaData" /> instance. Used when implementing a <see cref="IFindSagas{T}" />.
/// </summary>
/// <typeparam name="TSagaData">The <see cref="IContainSagaData" /> type to return.</typeparam>
/// <param name="session">
/// Used to provide an extension point and access the current <see cref="DbConnection" /> and
/// <see cref="DbTransaction" />.
/// </param>
/// <param name="context">Used to append a concurrency value that can be verified when the SagaData is persisted.</param>
/// <param name="whereClause">The SQL where clause to append to the retrieve saga SQL statement.</param>
/// <param name="appendParameters">Used to append <see cref="DbParameter" />s used in the <paramref name="whereClause" />.</param>
public static Task <TSagaData> GetSagaData <TSagaData>(this SynchronizedStorageSession session, ReadOnlyContextBag context, string whereClause, ParameterAppender appendParameters)
where TSagaData : class, IContainSagaData
{
Guard.AgainstNull(nameof(session), session);
Guard.AgainstNull(nameof(context), context);
Guard.AgainstNull(nameof(appendParameters), appendParameters);
Guard.AgainstNullAndEmpty(nameof(whereClause), whereClause);
var writableContextBag = (ContextBag)context;
var sqlSession = session.GetInternalSqlStorageSession();
if (sqlSession.InfoCache == null)
{
throw new Exception("Cannot load saga data because the Sagas feature is disabled in the endpoint.");
}
return(SagaPersister.GetByWhereClause <TSagaData>(whereClause, session, writableContextBag, appendParameters, sqlSession.InfoCache));
}