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Tapeti/Examples/03-FlowRequestResponse/ParallelFlowController.cs

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C#
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using System;
using System.Threading.Tasks;
using ExampleLib;
using Messaging.TapetiExample;
using Tapeti.Config.Annotations;
using Tapeti.Flow;
using Tapeti.Flow.Annotations;
namespace _03_FlowRequestResponse
{
[MessageController]
[DynamicQueue("tapeti.example.03")]
public class ParallelFlowController
{
private readonly IFlowProvider flowProvider;
private readonly IExampleState exampleState;
public string? FirstQuote;
public string? SecondQuote;
public string? ThirdQuote;
public ParallelFlowController(IFlowProvider flowProvider, IExampleState exampleState)
{
this.flowProvider = flowProvider;
this.exampleState = exampleState;
}
[Start]
public IYieldPoint StartFlow()
{
return flowProvider.YieldWithParallelRequest()
.AddRequestSync<QuoteRequestMessage, QuoteResponseMessage>(
new QuoteRequestMessage
{
Amount = 1
},
HandleFirstQuoteResponse)
.AddRequest<QuoteRequestMessage, QuoteResponseMessage>(
new QuoteRequestMessage
{
Amount = 2
},
HandleSecondQuoteResponse)
.YieldSync(AllQuotesReceived);
}
[Continuation]
public void HandleFirstQuoteResponse(QuoteResponseMessage message)
{
Console.WriteLine("[ParallelFlowController] First quote response received");
FirstQuote = message.Quote;
}
[Continuation]
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public async ValueTask HandleSecondQuoteResponse(QuoteResponseMessage message, IFlowParallelRequest parallelRequest)
{
Console.WriteLine("[ParallelFlowController] Second quote response received");
SecondQuote = message.Quote;
// Example of adding a request to an ongoing parallel request
await parallelRequest.AddRequestSync<QuoteRequestMessage, QuoteResponseMessage>(
new QuoteRequestMessage
{
Amount = 3
},
HandleThirdQuoteResponse);
}
[Continuation]
public void HandleThirdQuoteResponse(QuoteResponseMessage message)
{
Console.WriteLine("[ParallelFlowController] First quote response received");
ThirdQuote = message.Quote;
}
private IYieldPoint AllQuotesReceived()
{
Console.WriteLine("[ParallelFlowController] First quote: " + FirstQuote);
Console.WriteLine("[ParallelFlowController] Second quote: " + SecondQuote);
Console.WriteLine("[ParallelFlowController] Third quote: " + ThirdQuote);
return flowProvider.YieldWithParallelRequest()
.YieldSync(ImmediateConvergeTest, FlowNoRequestsBehaviour.Converge);
}
private IYieldPoint ImmediateConvergeTest()
{
Console.WriteLine("[ParallelFlowController] Second parallel flow immediately converged");
exampleState.Done();
return flowProvider.End();
}
}
}