Isomorphic Kotlin Troy Miles @therockncoder Troy Miles - - PowerPoint PPT Presentation

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Isomorphic Kotlin Troy Miles @therockncoder Troy Miles - - PowerPoint PPT Presentation

Aug 08, 2023 134 likes •670 views

Isomorphic Kotlin Troy Miles @therockncoder Troy Miles @therockncoder Troy Miles, aka the Rockncoder, began writing computer games in assembly language for early computers like the Apple II, Commodore C64, and the IBM PC over 38 years ago.

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@therockncoder

Troy Miles

Isomorphic Kotlin

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Troy Miles

@therockncoder

Troy Miles, aka the Rockncoder, began writing computer games in assembly language for early computers like the Apple II, Commodore C64, and the IBM PC over 38 years

  • ago. Nowadays he writes web & mobile apps for a

Southern California based automotive valuation and information company. Troy is fluent in JavaScript, C#, C ++, Kotlin, and Clojure. Check out my Kotlin video: https://www.lynda.com/Java-tutorials/Kotlin-Java- Developers/562926-2.html He can be reached at: rockncoder@gmail.com

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https://github.com/Rockncoder/rk1

The source code

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FuelEconomy.gov

Source of the example data

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the official government source for fuel economy information

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FuelEconomy.gov

  • Free vehicle information
  • Source of MPG information
  • Web service
  • Download data in either XML or CSV
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mongoimport

Imports data to MongoDB

mongoimport -h dsXXXXXX.mlab.com:XXXXX -d users -c vehicle -u admin --file vehicles-1997.csv

  • -type csv --columnsHaveTypes --fields

"barrels08.double(),city08.double(),comb08.double(),cylinders.int32(),displ.double(),drive.string(),e ngId.int32(),eng_dscr.string(),fuelCost08.double(),fuelType.string(),highway08.double(),id.int32(),m ake.string(),model.string(),mpgData.string(),trany.string(),UCity.double(),UHighway.double(),VClass .string(),year.int32(),youSaveSpend.double(),guzzler.string(),trans_dscr.string(),createdOn.string(), modifiedOn.string()" --parseGrace skipField -p

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Microservice

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A service with one and only one, very narrowly focused capability that a remote API exposes to the rest of the system.

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Microservice

Key ideas

  • Runs in its own process
  • Owns its data store
  • Can be deployed on its own
  • Can be written in different languages
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Java Web Frameworks

What do these all have in common?

  • Spring MVC
  • Struts 2
  • JavaServer Faces (JSF)
  • Play!
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Java Microservice Frameworks

Source Info

  • Spark aka. SparkJava
  • Ratpack
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Spark

aka SparkJava

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A micro framework for creating web applications in Kotlin and Java 8 with minimal effort

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Spark aka SparkJava

http://sparkjava.com/

  • Supports Java and Kotlin
  • First released Feb 7, 2013
  • Latest May 13, 2017, version 2.6.0
  • Lots of docs and tutorials
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Ratpack

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Ratpack

https://ratpack.io/

Lean & powerful HTTP apps

  • Supports Groovy, Java and Kotlin
  • First released Jul 21, 2012
  • Latest release Sept. 3, 2017, version 1.5.0
  • Lots of docs but not a lot of examples
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RESTful API

  • Defined by RFC 2616 protocol
  • Preferred over SOAP since it uses less bandwidth
  • Breaks down a transaction into a series of HTTP methods
  • Stateless by design
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GET Method

GET /resource

Request has body No Successful response has body Yes Safe Yes Idempotent Yes Cacheable Yes

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HEAD Method

HEAD /resource (HEAD * )

Request has body No Successful response has body No Safe Yes Idempotent Yes Cacheable Yes

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POST Method

POST /resource

Request has body Yes Successful response has body Yes Safe No Idempotent No Cacheable No*

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PUT Method

PUT /new-resource

Request has body Yes Successful response has body No Safe No Idempotent Yes Cacheable No

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PATCH Method

PATCH /resource

Request has body Yes Successful response has body No Safe No Idempotent No Cacheable No

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DELETE Method

DELETE /resource

Request has body No Successful response has body No Safe No Idempotent Yes Cacheable No

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OPTIONS Method

OPTIONS /resource

Request has body No Successful response has body Yes Safe Yes Idempotent No Cacheable No

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MongoDB

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MongoDB

  • Document Database
  • High Performance
  • High Availability
  • Easy Scalability
  • Geospatial Data
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Top DB Engines

https://db-engines.com/en/ranking

October 2017

  • 1. Oracle
  • 2. MySQL
  • 3. MS SQL Server
  • 4. PostgreSQL
  • 5. MongoDB
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SQL to MongoDB

SQL MongoDB

column field row document table collection database database joins none transactions none

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CRUD Operations

https://db-engines.com/en/ranking

  • Create: insert()
  • Read: find()
  • Update: update()
  • Delete: remove(<query>)
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Query Modifiers

https://db-engines.com/en/ranking

  • db.<collection name>.find(<query>)
  • skip()
  • take()
  • sort()
  • pretty()
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KMongo

http://litote.org/kmongo/

A Kotlin toolkit for Mongo

  • Wraps the MongoDB Java driver
  • Converts objects from JSON to KOJO
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mLab

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mLab

the leading Database-as-a-Service for MongoDB

  • Database as a Service (DaaS) provider
  • Supports AWS, Azure, App Engine
  • Used by Fox, New York Times, Lyft, Toyota, SAP
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Heroku

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Heroku

Platform-as-a-Service (PaaS)

  • Supports PHP, Python, Node.js, Java, Scala, and Go
  • Runs on top of AWS
  • Bought by Salesforce in 2010
  • Runs instances which require very little configuration
  • heroic + haiku = heroku
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Setup

free developer account

  • Have Git installed
  • Create a free Heroku account
  • Install the Heroku CLI
  • brew install heroku/brew/heroku
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Deployment

  • heroku login
  • heroku create <app-name> (must be unique)
  • git push heroku master
  • heroku open
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Live Demo

Cross your fingers…

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#kotlinconf17

@therockncoder

Troy Miles

Thank you!