gell-event

support for event based systems

Brainstorm

• ideas/implementation around event based systems starting to coalesce
  • common event structure/objects
  • standardized approach to defining event handlers
    • action
    • side effect
    • etc
  • event dispatching
• "future" concept is built for event dispatching

Features

• event discovery
  • generate event metadata
  • consistent and clear event naming
• event directory
  • simple lookup mechanism
• event dispatching
• unit testing
• generated documentation
  • should be able to go into any package, run a cli command, and understand what the package defines
  • apis for web based tooling

Event Based Systems

• apis
  • HTTP or WS based
  • action events
    • user/actor trying to do something
  • snapshot events
    • "queries"
• jobs
  • trigger job execution
• AWS Lambdas
• DynamoDB streams

Event Dispatching Concepts

• discovery
  • what events can be handled?
• catalog
  • event types that have been discovered
  • handlers can be looked up
  • metadata about the available events
  • could be called "directory"
• naming
  • how event handlers in a catalog are referenced
• middleware
  • cross-cutting concerns common to all event handlers
• dispatcher
  • invokes event handler

NPM Packages

there doesn't seem to be a general purpose routing/dispatch library out there * several for matching URL routes to handlers

• Emittery (https://github.com/sindresorhus/emittery)
  • handle async events