Hands-On Software Engineering with Python

Traffic to and from the service

The message-receiving aspect of the communication chain by the service is already in place, in the main method of ArtisanGateway, but no message-sending functionality has been implemented yet, apart from the bits and pieces focused around message generation. Each data object type, when modified, created, or deleted, is going to need to send a relevant command message to its counterpart subsystem. For example, if an Artisan creates a new Product, the act of creating that Product object needs to send a "create product" message to the Gateway service. Likewise, if a change is made to a Product by Central Office staff, the Gateway service needs to send an "update product" message to the appropriate Artisan Application ...