/// <summary>
/// Consumes the specified saga message - finds the existing saga that can consume given message type and with matching CorrelationId.
/// </summary>
/// <param name="sagaMessage">The saga message.</param>
/// <returns>
/// Result of the operation
/// </returns>
/// <exception cref="System.ArgumentException"></exception>
public OperationResult Consume(ISagaMessage sagaMessage)
{
Guard.CheckSagaMessage(sagaMessage, nameof(sagaMessage));
var resolvedSaga = sagaFactory.ResolveSagaConsumedBy(sagaMessage);
var sagaType = resolvedSaga.GetType();
var saga = NSagaReflection.InvokeGenericMethod(sagaRepository, "Find", sagaType, sagaMessage.CorrelationId);
if (saga == null)
{
throw new ArgumentException($"Saga with this CorrelationId does not exist. Please initiate a saga with IInitiatingMessage. {sagaMessage.CorrelationId}");
}
pipelineHook.BeforeConsuming(new PipelineContext(sagaMessage, (IAccessibleSaga)saga));
var errors = (OperationResult)NSagaReflection.InvokeMethod(saga, "Consume", sagaMessage);
pipelineHook.AfterConsuming(new PipelineContext(sagaMessage, (IAccessibleSaga)saga, errors));
if (errors.IsSuccessful)
{
sagaRepository.Save((IAccessibleSaga)saga);
pipelineHook.AfterSave(new PipelineContext(sagaMessage, (IAccessibleSaga)saga, errors));
}
return(errors);
}
/// <summary>
/// Consumes the specified initiating message and creates a new instance of the correlating saga.
/// <para>Saga is not persisted if operation have failed</para>
/// </summary>
/// <param name="initiatingMessage">The initiating message.</param>
/// <returns>
/// Result of the operation
/// </returns>
/// <exception cref="System.ArgumentException"></exception>
public OperationResult Consume(IInitiatingSagaMessage initiatingMessage)
{
Guard.CheckSagaMessage(initiatingMessage, nameof(initiatingMessage));
var resolvedSaga = sagaFactory.ResolveSagaInititatedBy(initiatingMessage);
var sagaType = resolvedSaga.GetType();
// try to find sagas that already exist
var existingSaga = NSagaReflection.InvokeGenericMethod(sagaRepository, "Find", sagaType, initiatingMessage.CorrelationId);
if (existingSaga != null)
{
throw new ArgumentException($"Trying to initiate the same saga twice. {initiatingMessage.GetType().Name} is Initiating Message, but saga of type {sagaType.Name} with CorrelationId {initiatingMessage.CorrelationId} already exists");
}
// now create an instance of saga and persist the data
var saga = sagaFactory.ResolveSaga(sagaType);
NSagaReflection.Set(saga, "CorrelationId", initiatingMessage.CorrelationId);
// if SagaData is null - create an instance of the object and assign to saga
var sagaData = NSagaReflection.Get(saga, "SagaData");
if (sagaData == null)
{
var sagaDataType = NSagaReflection.GetInterfaceGenericType(saga, typeof(ISaga <>));
var newSagaData = Activator.CreateInstance(sagaDataType);
NSagaReflection.Set(saga, "SagaData", newSagaData);
}
var sagaHeaders = NSagaReflection.Get(saga, "Headers");
if (sagaHeaders == null)
{
NSagaReflection.Set(saga, "Headers", new Dictionary <String, String>());
}
pipelineHook.BeforeInitialisation(new PipelineContext(initiatingMessage, (IAccessibleSaga)saga));
var errors = (OperationResult)NSagaReflection.InvokeMethod(saga, "Initiate", initiatingMessage);
pipelineHook.AfterInitialisation(new PipelineContext(initiatingMessage, (IAccessibleSaga)saga, errors));
if (errors.IsSuccessful)
{
sagaRepository.Save(saga);
pipelineHook.AfterSave(new PipelineContext(initiatingMessage, (IAccessibleSaga)saga, errors));
}
return(errors);
}