AppSync

AppSync is a fully managed GraphQL service.

Notes:

It can support real-time APIs via Graph 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 Function
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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