Composition

Composition is fundamental to tc. Here are some examples:

Compose an event and function:

name: example-composition

events:
  MyEvent:
    function: foo

To compose a linear DAG of functions:

functions:
  foo:
    function: bar
  bar:
  function: baz

To compose a route and a function:

routes:
  /api/ping:
    function: foo

To compose a function and a mutation:

name: example-orchestrator

events:
  MyEvent:
    function: foo

functions:
  foo:
    function: bar
    mutation: processMessage

mutations:
  authorizer: authorizer
  types:
    Message:
      id: String!
      text: String
  resolvers:
    processMessage:
      function: tester
      input: Message
      output: Message
      subscribe: true

Entity Composition Matrix

The following shows the composability Matrix for entities

	Function	Event	Queue	Route	Channel	Mutation	Page
Function	Yes	Yes				Yes
Event	Yes				Yes	Yes
Route	Yes					Yes
Queue	Yes
Channel	Yes
Mutation	Yes	Yes
Page				Yes