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Service Invocation

In this quickstart, you'll create a checkout service and an order processor service to demonstrate how to use the service invocation API. The checkout service uses Dapr's http proxying capability to invoke a method on the order processing service.

Visit this link for more information about Dapr and service invocation.

This quickstart includes one checkout service:

.NET client service checkout

And one order processor service:

.NET order-processor service order-processor

Run all apps with multi-app run template file:

This section shows how to run both applications at once using multi-app run template files with dapr run -f .. This enables to you test the interactions between multiple applications.

Open a new terminal window and run order-processor and checkout using the multi app run template defined in dapr.yaml:

dapr run -f .

The terminal console output should look similar to this:

== APP - order-processor == Order received : Order { orderId = 1 }
== APP - checkout == Order passed: Order { OrderId = 1 }
== APP - order-processor == Order received : Order { orderId = 2 }
== APP - checkout == Order passed: Order { OrderId = 2 }
== APP - order-processor == Order received : Order { orderId = 3 }
== APP - checkout == Order passed: Order { OrderId = 3 }
== APP - order-processor == Order received : Order { orderId = 4 }
== APP - checkout == Order passed: Order { OrderId = 4 }
== APP - order-processor == Order received : Order { orderId = 5 }
== APP - checkout == Order passed: Order { OrderId = 5 }
== APP - order-processor == Order received : Order { orderId = 6 }
== APP - checkout == Order passed: Order { OrderId = 6 }
== APP - order-processor == Order received : Order { orderId = 7 }
== APP - checkout == Order passed: Order { OrderId = 7 }
== APP - order-processor == Order received : Order { orderId = 8 }
== APP - checkout == Order passed: Order { OrderId = 8 }
== APP - order-processor == Order received : Order { orderId = 9 }
== APP - checkout == Order passed: Order { OrderId = 9 }
== APP - order-processor == Order received : Order { orderId = 10 }
== APP - checkout == Order passed: Order { OrderId = 10 }

Stop and clean up application processes

dapr stop -f .

Run a single app at a time with Dapr (Optional)

An alternative to running all or multiple applications at once is to run single apps one-at-a-time using multiple dapr run .. -- dotnet run commands. This next section covers how to do this.

Run .NET `order-processor` with Dapr

Open a new terminal window and run the Dotnet order-processor app with Dapr:

cd ./order-processor
dapr run --app-port 7001 --app-id order-processor --app-protocol http --dapr-http-port 3501 -- dotnet run

Run .NET `checkout` with Dapr

Open a new terminal and run the Dotnet checkout app with Dapr:

cd ./checkout
dapr run  --app-id checkout --app-protocol http --dapr-http-port 3500 -- dotnet run

Stop and clean up application processes

dapr stop --app-id order-processor
dapr stop --app-id checkout

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