AppSync

AppSync is a fully managed GraphQL service.

Notes:

It can support real-time APIs via GraphQL subscriptions.
AppSync supports custom domains
AppSync has a query editor built into the UI

Resolvers

Resolvers attached to specific fields within your types in your schema. used to implement the state-changing operations for your query, mutation, and subscription field operations.

Runtimes:

APPSYNC_JS: JavaScript
VTL: Velocity Template Language.

Data Sources

Where data is being pulled from.

DynamoDB Table
Amazon OpenSearch
AWS _Lambda
HTTP Endpoint
Amazon EventBridge
Relational Database (RDS HTTP Endpoint)

API Types

GraphQL APIs - single API from multiple data sources
Merged APIs - a collection of Graph APIs that act as one API
- Useful if you have multiple teams that manage their own API but you want to treat all the APIs as a single API.

Caching Options

None: Self explanatory; no caching, resolvers will always fetch from data sources.
Full request caching: Self explanatory; caches all requests.
Per-resolver caching: specific operation or field defined in a resolver will return responses from the cache. Caching isn't serverless; you must provision an on-demand instance.

Authorisation

API Key
AWS IAM
Cognito User Pools

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