public override bool MoveNext()
{
var statefulTaskWithRollback = _realEnumerator.Current;
if (statefulTaskWithRollback is null)
{
throw GetStatefulTaskIsNullException();
}
try
{
// Execute current task.
bool canMoveNext = _realEnumerator.MoveNext();
// "Current" property can change -> add to scope the previous one.
_rollbackScope.Add(statefulTaskWithRollback);
// On final task clear rollback scope.
if (!canMoveNext)
{
_rollbackScope.CommitAndClear();
}
return(canMoveNext);
}
catch (Exception ex)
{
Logger.Exception(
ex, "Failed to execute state machine. Trying to rollback completed tasks."
);
_rollbackScope.TryRollbackSafe();
// Rethrow original exception to signalize callers that state machine execution is failed.
throw;
}
}
public static void RunSimpleSample()
{
var actionOne = new SimpleRollbackActionOne();
var actionTwo = new SimpleRollbackActionTwo();
using var scope = new RollbackScope <int>(
continueRollbackOnFailed: true, rollbackParameter: 42
);
scope.Add(actionOne);
scope.Add(actionTwo);
scope.TryRollbackSafe();
}