Creating Service Layer Between GraphQL Client and Existing REST API

Creating Service Layer Between GraphQL Client and Existing REST API. First-ever ReactNCR meetup in Delhi.

Transcript

1. - Anil Gurindapalli Service Layer Between GraphQL Client and Existing REST API @AGurindapalli
2. A human-first, last mile collaboration & business orchestration platform that seamlessly enables the enterprise digital transformation of Manufacturing, across all aspects of the life cycle! XAMPR E N D - T O - E N D B U S I N E S S P R O C E S S O R C H E S T R A T I O N S E A M L E S S I N T E L L I G E N C E A C R O S S S Y S T E M S C O M P L E T E L Y C O N F I G U R A B L E W O R K F L O W S
3. Agenda Code Time Service Layer? Lib or Tools Implementing GraphQL. GraphQL
4. GraphQL is a query language for APIs and a runtime for fulfilling those queries with your existing data. GraphQL Simply “GraphQL is a Syntax that describes how to ask for the data”.
5. Three Characteristics • It lets the client specify exactly what data it needs. • Aggregate data from multiple resources • Use type system to describe data.
6. GraphQL is organized around Three Building blocks Schema Resolvers Queries
7. Without GraphQL With GraphQL
8. Lib’s or Tools to Implement GraphQL
9. A JavaScript framework for building data-driven React Applications powered by GraphQL. -Developed by Facebook Apollo is a complete platform for implementing a graph over your data. -Community driven http://facebook.github.io/relay/en/ https://www.apollographql.com/ Includes two runtime Libraries. 1. Apollo-Client 2. Apollo-Server Relay ApollographQL
10. Service Layer? In a Layered Architecture, clients do not talk directly to servers. Instead, a layered approach is adopted in which some concerns such as caching, API key Management etc., are addressed.
12. In some cases, this data graph tier will talk to the backend services using GraphQL. But, most frequently, the backend services are left untouched and continue to be accessed by their existing APIs, such as REST, SOAP, even SQL, with the mapping from these APIs to data graph objects accomplished by Service Layer.
13. Benefits of Service Layer What are we doing in XAMPR Servicer layer? • Accessing REST API’s • Business Logic • Caching • Web Sockets • Micro Services 1. Redistributing load and payload optimization 2. Reusable abstractions 3. Simplifying development. 4. If Query Fails still return data to the client to render data as much as possible. etc
15. Service Layer Implementation using Apollo- Server
16. server.js
17. Typedefs
18. API Resolvers
19. Output
20. Thank You @AGurindapalli