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:

• Java client service checkout

And one order processor service:

• Java order-processor service order-processor

Pre-requisites

• Dapr and Dapr Cli.
• Java JDK 11 (or greater):
  • Microsoft JDK 11
  • Oracle JDK 11
  • OpenJDK 11
• Apache Maven version 3.x.

Run Java order-processor with Dapr

1. Open a new terminal window and navigate to order-processor directory and install dependencies:

cd ./order-processor
mvn clean install

2. Run the Java order-processor app with Dapr:

cd ./order-processor
dapr run --app-id order-processor --app-port 9001 --app-protocol http --dapr-http-port 3501 -- java -jar target/OrderProcessingService-0.0.1-SNAPSHOT.jar

Run Java checkout service with Dapr

1. Open a new terminal window and navigate to checkout directory and install dependencies:

cd ./checkout
mvn clean install

2. Run the Java checkout app with Dapr:

cd ./checkout
dapr run --app-id checkout --app-protocol http --dapr-http-port 3500 -- java -jar target/CheckoutService-0.0.1-SNAPSHOT.jar

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

Start all apps with multi app run template file:

1. Open a new terminal window and install dependencies for order-processor and checkout apps:

cd ./order-processor
mvn clean install
cd ../checkout
mvn clean install

2. Run the multi app run template:

dapr run -f .

dapr stop -f .