August 2018
Intermediate to advanced
314 pages
8h 9m
English
Content preview from Java EE 8 Design Patterns and Best Practices
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Backing services
Backing services are external services used by the application, such as a database, message service, file repository, or email service. The twelve-factor method considers each service that is external to the application as a resource. Each of these resources must be accessed via a URL or location and credentials attributes that are in the app's config. In this way, any changes to a service location—such as the database or file repository—does not impact the application code. The change becomes imperceptible to the code, resulting in a low desired coupling. We can also use abstractions or interfaces to access these services in addition to the app's config.
As a first example, we have the file stored in a repository. Access ...
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