I want to publish a message from a Saga where the messgae type is not known compile time, only runtime. So far i've only found methods for publishing a message with generic signature - i cannot find any where i can publish a runtime type.
I'm in the works of modifying the Sample-Batch application https://github.com/MassTransit/Sample-Batch to be able to batch any message type
How Sample-Batch is configured
Initially(
When(BatchJobReceived)
.Then(context => Touch(context.Saga, context.Message.Timestamp))
.Then(context => SetReceiveTimestamp(context.Saga, context.Message.Timestamp))
.Then(Initialize)
.PublishAsync(context => context.Init<ProcessBatchJob>(new
{
BatchJobId = context.Saga.CorrelationId,
InVar.Timestamp,
context.Saga.BatchId,
context.Saga.OrderId,
context.Saga.Action
}))
.TransitionTo(Received));
What i want to accomplish
BatchJobReceived
messageInnerMessageAsString
and InnerMessageType
Initially(
When(BatchJobReceived)
.Then(context => Touch(context.Saga, context.Message.Timestamp))
.Then(context => SetReceiveTimestamp(context.Saga, context.Message.Timestamp))
.Then(Initialize)
.Then(context => DeserializeInnerMessage(context.Saga, context.Message))
.PublishAsync(context => context.Init(context.Saga.InnerMessage, context.Saga.InnerMessageType))
.TransitionTo(Received));
static void DeserializeInnerMessage(BatchJobState state, BatchJobReceived job)
{
var innerMessageType = Type.GetType(job.InnerMessageType);
var innerMessage = JsonConvert.DeserializeObject(job.InnerMessageAsString, innerMessageType);
state.InnerMessage = innerMessage;
}
There are however no context.Init()
methods taking a Type parameter, it solely have a generic signature context.Init<>()
.
How do i accomplish this? Or any other approaches more suitable?
There isn't one, you can use your own ThenAsync
statement to publish an unknown type as object
:
.ThenAsync(x => x.Publish(x.Saga.InnerMessage, x.Saga.InnerMessageType)
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