Running the sample code

1. Start a local PostgresSQL server on default port 5432 and a Kafka broker on port 9092. The included docker-compose.yml starts everything required for running locally.

   docker-compose up -d
   
   # creates the tables needed for Akka Persistence
   # as well as the offset store table for Akka Projection
   docker exec -i shopping-cart-service_postgres-db_1 psql -U shopping-cart -t < ddl-scripts/create_tables.sql
   
   # creates the user defined projection table.
   docker exec -i shopping-cart-service_postgres-db_1 psql -U shopping-cart -t < ddl-scripts/create_user_tables.sql
   

2. Make sure you have compiled the project

   mvn compile 
   

3. Start a first node:

   mvn compile exec:exec -DAPP_CONFIG=local1.conf
   

4. (Optional) Start another node with different ports:

   mvn compile exec:exec -DAPP_CONFIG=local2.conf
   

5. (Optional) More can be started:

   mvn compile exec:exec -DAPP_CONFIG=local3.conf
   

6. Check for service readiness

   curl http://localhost:9101/ready
   

7. Try it with grpcurl:

   # add item to cart
   grpcurl -d '{"cartId":"cart1", "itemId":"socks", "quantity":3}' -plaintext 127.0.0.1:8101 shoppingcart.ShoppingCartService.AddItem
   
   # get cart
   grpcurl -d '{"cartId":"cart1"}' -plaintext 127.0.0.1:8101 shoppingcart.ShoppingCartService.GetCart
   
   # update quantity of item
   grpcurl -d '{"cartId":"cart1", "itemId":"socks", "quantity":5}' -plaintext 127.0.0.1:8101 shoppingcart.ShoppingCartService.UpdateItem
   
   # check out cart
   grpcurl -d '{"cartId":"cart1"}' -plaintext 127.0.0.1:8101 shoppingcart.ShoppingCartService.Checkout
   
   # get item popularity
   grpcurl -d '{"itemId":"socks"}' -plaintext 127.0.0.1:8101 shoppingcart.ShoppingCartService.GetItemPopularity
   

   or same grpcurl commands to port 8102 to reach node 2.