public async static Task <CreditAgencyResult> CheckCreditAgency(
[ActivityTrigger] CreditAgencyRequest request,
[SignalR(HubName = "dashboard")] IAsyncCollector <SignalRMessage> dashboardMessages,
ILogger log)
{
log.LogWarning($"Checking agency {request.AgencyName} for customer {request.Application.Applicant.ToString()} for {request.Application.LoanAmount}");
await dashboardMessages.AddAsync(new SignalRMessage
{
Target = "agencyCheckStarted",
Arguments = new object[] { request }
});
var rnd = new Random();
await Task.Delay(rnd.Next(2000, 4000)); // simulate variant processing times
var result = new CreditAgencyResult
{
IsApproved = !(request.AgencyName.Contains("Woodgrove") && request.Application.LoanAmount.Amount > 4999),
Application = request.Application,
AgencyId = request.AgencyId
};
await dashboardMessages.AddAsync(new SignalRMessage
{
Target = "agencyCheckComplete",
Arguments = new object[] { result }
});
log.LogWarning($"Agency {request.AgencyName} {(result.IsApproved ? "APPROVED" : "DECLINED")} request by customer {request.Application.Applicant.ToString()} for {request.Application.LoanAmount}");
return(result);
}
public static async Task <LoanApplicationResult> Orchestrate(
[OrchestrationTrigger] DurableOrchestrationContext context,
[SignalR(HubName = "dashboard")] IAsyncCollector <SignalRMessage> dashboardMessages,
ILogger logger)
{
var loanApplication = context.GetInput <LoanApplication>();
var agencyTasks = new List <Task <CreditAgencyResult> >();
var agencies = new List <CreditAgencyRequest>();
var results = new CreditAgencyResult[] {};
logger.LogWarning($"Status of application for {loanApplication.CustomerName} for {loanApplication.LoanAmount}: Checking with agencies.");
// start the process and perform initial validation
var loanStarted = await context.CallActivityAsync <bool>(nameof(Receive), loanApplication);
// fan out and check the credit agencies
if (loanStarted)
{
agencies.AddRange(new CreditAgencyRequest[] {
new CreditAgencyRequest {
AgencyName = "Contoso, Ltd.", AgencyId = "contoso", Application = loanApplication
},
new CreditAgencyRequest {
AgencyName = "Fabrikam, Inc.", AgencyId = "fabrikam", Application = loanApplication
},
new CreditAgencyRequest {
AgencyName = "Woodgrove Bank", AgencyId = "woodgrove", Application = loanApplication
}
});
foreach (var agency in agencies)
{
agencyTasks.Add(context.CallActivityAsync <CreditAgencyResult>(nameof(CheckCreditAgency), agency));
}
await dashboardMessages.AddAsync(new SignalRMessage
{
Target = "agencyCheckPhaseStarted",
Arguments = new object[] { }
});
// wait for all the agencies to return their results
results = await Task.WhenAll(agencyTasks);
await dashboardMessages.AddAsync(new SignalRMessage
{
Target = "agencyCheckPhaseCompleted",
Arguments = new object[] { !(results.Any(x => x.IsApproved == false)) }
});
}
var response = new LoanApplicationResult
{
Application = loanApplication,
IsSuccess = loanStarted && !(results.Any(x => x.IsApproved == false))
};
logger.LogWarning($"Agency checks result with {response.IsSuccess} for loan amount of {response.Application.LoanAmount} to customer {response.Application.CustomerName}");
await dashboardMessages.AddAsync(new SignalRMessage
{
Target = "loanApplicationComplete",
Arguments = new object[] { response }
});
return(response);
}
public static async Task <LoanApplicationResult> Orchestrate(
[OrchestrationTrigger] IDurableOrchestrationContext context,
[SignalR(HubName = "dashboard")] IAsyncCollector <SignalRMessage> dashboardMessages,
ILogger logger)
{
var loanApplication = context.GetInput <LoanApplication>();
var agencyTasks = new List <Task <CreditAgencyResult> >();
var agencies = new List <CreditAgencyRequest>();
var results = new CreditAgencyResult[] {};
logger.LogWarning($"Status of application for {loanApplication.Applicant.ToString()} for {loanApplication.LoanAmount}: Checking with agencies.");
// start the process and perform initial validation
bool loanPreApproved = await context.CallActivityAsync <bool>(nameof(Receive), loanApplication);
// fan out and check the credit agencies
agencies.AddRange(new CreditAgencyRequest[] {
new CreditAgencyRequest {
AgencyName = "Contoso, Ltd.", AgencyId = "contoso", Application = loanApplication
},
new CreditAgencyRequest {
AgencyName = "Fabrikam, Inc.", AgencyId = "fabrikam", Application = loanApplication
},
new CreditAgencyRequest {
AgencyName = "Woodgrove Bank", AgencyId = "woodgrove", Application = loanApplication
},
});
foreach (var agency in agencies)
{
agencyTasks.Add(context.CallActivityAsync <CreditAgencyResult>(nameof(CheckCreditAgency), agency));
}
await context.CallActivityAsync(nameof(SendDashboardMessage), new SignalRMessage
{
Target = "agencyCheckPhaseStarted",
Arguments = new object[] { }
});
// wait for all the agencies to return their results
results = await Task.WhenAll(agencyTasks);
await context.CallActivityAsync(nameof(SendDashboardMessage), new SignalRMessage
{
Target = "agencyCheckPhaseCompleted",
Arguments = new object[] { !(results.Any(x => x.IsApproved == false)) }
});
var loanApplicationResult = new LoanApplicationResult
{
IsApproved = loanPreApproved && !(results.Any(x => x.IsApproved == false)),
Application = loanApplication
};
logger.LogWarning($"Agency checks result with {loanApplicationResult.IsApproved} for loan amount of {loanApplication.LoanAmount.Amount} to customer {loanApplication.Applicant.ToString()}");
foreach (var agencyResult in results)
{
loanApplicationResult.AgencyResults.Add(new AgencyCheckResult
{
AgencyName = agencyResult.AgencyId,
IsApproved = agencyResult.IsApproved
});
}
// send the loan for final human validation
logger.LogInformation($"Sending loan application for {loanApplicationResult.Application.Applicant.FirstName} {loanApplicationResult.Application.Applicant.LastName} for approval");
var json = System.Text.Json.JsonSerializer.Serialize <LoanApplicationResult>(loanApplicationResult,
new JsonSerializerOptions
{
WriteIndented = true
});
logger.LogInformation(json);
var url = Environment.GetEnvironmentVariable("LoanOfficerServiceUrl");
logger.LogInformation(url);
var request = new DurableHttpRequest(
HttpMethod.Post,
new Uri(url),
headers: new Dictionary <string, StringValues> {
{ "Content-Type", "application/json" }
},
content: json,
asynchronousPatternEnabled: false
);
DurableHttpResponse restartResponse = await context.CallHttpAsync(request);
logger.LogInformation($"Status code returned: {restartResponse.StatusCode}");
if (restartResponse.StatusCode == HttpStatusCode.Accepted)
{
await context.CallActivityAsync(nameof(SendDashboardMessage), new SignalRMessage
{
Target = "loanApplicationComplete",
Arguments = new object[] { loanApplicationResult }
});
}
return(loanApplicationResult);
}