Building a non-blocking REST API in less than 30 minutes

Oct 25, 2015Download as PPT, PDF0 likes1,237 views

This document discusses building a non-blocking REST API in Play Framework and Scala in less than 30 minutes. It will cover creating a simple REST API for managing work hours using ScalikeJDBC for asynchronous database access. The API will include models for Employee, Project, and TimeEntry connected to a relational database, allowing CRUD operations on time entries. It also discusses best practices for REST APIs like adhering to Fielding constraints and using JSON for request/response bodies.

Building a non-blocking
REST API
in less than 30 minutes
Thomas Meijers - @ItsMeijers

About me
Thomas Meijers @ItsMeijers
Lunatech
Student
Play Framework Amsterdam @ItsMeijers

Experience with Play?
Play Framework Amsterdam @ItsMeijers

Experience with Scala?
Play Framework Amsterdam @ItsMeijers

Content
What are we building?
REST Refresh
Persistence
Building the API
ScalikeJDBC in Action
Fielding constraints
Recommendation
Play Framework Amsterdam @ItsMeijers

What are we building?
Simple non-blocking REST API for managing work hours
Consists of 3 models connected to a relational database
(CRUD)
Employee
Project
TimeEntry
Play Framework Amsterdam @ItsMeijers

What are we building?
Play Framework Amsterdam @ItsMeijers

REST & The Fielding Constraints
0. Client Server
1. Statelessness
2. Cacheable
3. Layered system
4. Uniform interface
5. Code on demand (optional)
Play Framework Amsterdam @ItsMeijers

Persistence
Relational Databases
Slick (Non-blocking)
Anorm
ScalikeJDBC
ScalikeJDBC-Async (Non-blocking)
Play Framework Amsterdam @ItsMeijers

ScalikeJDBC-Async
Tidy SQL-based DB access library for Scala
Cool QueryDSL (EDSL)
Play Framework support!
Non-blocking
* Experimental (although production ready)
Play Framework Amsterdam @ItsMeijers

Why Non-Blocking?
Play Framework Amsterdam @ItsMeijers

Building the API
Play Framework Amsterdam @ItsMeijers
What do we
want?
When do we want
it?
Code
!
Now
!

Dependencies in build.sbt
Play Framework Amsterdam @ItsMeijers

Configuration
Play Framework Amsterdam @ItsMeijers
Application.conf
play.plugins

Creating the URIs
Play Framework Amsterdam @ItsMeijers

ScalikeJDBC-Async
Play Framework Amsterdam @ItsMeijers

ScalikeJDBC-Async Mapping
Play Framework Amsterdam @ItsMeijers

Find a TimeEntry
Play Framework Amsterdam @ItsMeijers

Find a TimeEntry by Employee
Play Framework Amsterdam @ItsMeijers

Creating a TimeEntry
Play Framework Amsterdam @ItsMeijers

Deleting a TimeEntry
Play Framework Amsterdam @ItsMeijers

Representation Class
Play Framework Amsterdam @ItsMeijers
Send and retrieve from the client Send and retrieve from DB

JSON Parsing
Play Framework Amsterdam @ItsMeijers

JSON helper functions
Play Framework Amsterdam @ItsMeijers

API Index - GET /api
Play Framework Amsterdam @ItsMeijers

GET /api/time-entries
Play Framework Amsterdam @ItsMeijers

GET /api/time-entries/:id
Play Framework Amsterdam @ItsMeijers

POST /api/time-entries
Play Framework Amsterdam @ItsMeijers

PUT /api/time-entries/:id
Play Framework Amsterdam @ItsMeijers

DELETE /api/time-entries/:id
Play Framework Amsterdam @ItsMeijers

ScalikeJDBC-Async
In Action
Play Framework Amsterdam @ItsMeijers

Fielding Constraints
0. Client Server
1. Statelessness
2. Cacheable
3. Layered system
4. Uniform interface
5. Code on demand (optional)
Play Framework Amsterdam @ItsMeijers

github.com/ThomasMeijers/NonBlocking
Complete API
Play Framework Amsterdam @ItsMeijers

Use a hypermedia format
HAL - github.com/restfulscala/HALselhof
Siren - github.com/yetu/siren-scala
Documentation: Swagger.io
Slick
Monad Transformers
Recommendations
Play Framework Amsterdam @ItsMeijers

Thomas Meijers - @ItsMeijers
Thank you
Questions?
Lunatech is hiring!
val yourName: Future[AwesomeJob] = withSQL{ select.job.from(Lunatech) }

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