2. Structure

Components

The application is made up of the following:

• Rails web application to serve pages to the end users
• Azure active directory to authenticate users
• Heroku Scheduler and DelayedJob to process periodic/background tasks
• Repairs API to access universal housing and DRS data
• Neo4j to store references between works orders and keep track of what notes and work orders have been processed
• Redis for caching API responses
• Postgres to store the delayed job queue

The rails app is made up of 3 different kinds of processes

• Web dynos
• Feed Worker - accesses the feed api to keep the Neo4j DB up to date - there must be only 1 feed worker
• Worker - runs non-feed related jobs

See 6. Pretty Pictures for diagrams of how the components are used together.