1.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
Choosing a NoSQL API and Database
to Avoid Tombstones and Dragons
in Game On!
Leonardo Lima Otávio SantanaKate Stanley

2.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
About the Speakers
Katherine (Kate) Stanley
• Software Engineer, works for IBM
• From United Kingdom
• Work on Java development for IBM Cloud
• Committer to Game On
• Contributed to MicroProfile conference app
• Co-wrote IBM Redbook about Microservices with Java

3.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
About the Speakers
Leonardo Lima
• Computer engineer, server & embedded sw developer
• From São Paulo, Brasil, currently in Austin, TX
• CTO at V2COM
• Spec Lead – JSR363 – Units of Measurement
• V2COM’s Representative at JCP Executive Committee
[about.me/leomrlima]

4.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
Otávio Santana
• Software engineer, Tomitribe
• From Salvador, Brazil
• Java Champion, SouJava JUG Leader
• Apache, Eclipse and OpenJDK Committer
• Expert Group member in many JSRs
• Representative at JCP EC for SouJava
About the Speakers

5.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
Microservices &
GameOn!

6.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
Microservices are used to…
— … compose a complex
application using:
◦ “small”
◦ independent (autonomous)
◦ replaceable
◦ processes
— … that communicate via
language-agnostic APIs
Microservice
MicroserviceMicroservice
Microservice
Microservices application
Subscribe
REST
(JSON/HTTP)
Microservice
Microservice
broker
API
Microservice
Publish
API
REST
(JSON/HTTP)
Publish
Service
Registry
API
Microservice

7.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
Microservices sample apps…
Create a single service
Rebuild a pre-baked microservices application
Clueless
No idea
Confident
Has read all the
things!
Experienced
Hands-on understanding
Puzzled / Realistic
Challenges are real

8.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
Enter… GameOn!
— Hands on with microservices
— Stick with ’HelloWorld’ simplicity
— Choose your own adventure
— Fast path to the hard stuff
— Build something cool (to you!)
— Learn as you go

9.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
Twelve Factors
— “a methodology for building
software-as-a-service
applications”
◦ Created by developers at Heroku
— Factors are independent of
◦ programming language,
◦ backing services,
◦ cloud provider
— http://12factor.net/

10.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
At first…
ELK mongo
room
Player
Proxy
JSON/HTTP (REST)
Concierge

11.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
… and now!
kafkaELK amalgam8couchdb
room
PlayerAuth
SweepProxystatic
MediatorMap

12.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
About Dragons and Tombstones
— Problem: Maintaining a centered,
densely packed grid of rooms
— SQL is hard.
— CouchDB uses javascript to create
custom indexes
— BUT: Deleting rooms leaves
tombstones.They never go away.

13.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
The Map API
— Site has Name, Position (X,Y),
Connection information to the
WebService and a list of its
Doors.
— CRUD service; when you
retrieve a room, you get a list
of its adjacent rooms

14.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
The Map API
{
"name":"First Room",
"connectionDetails":{
…, "target":"ws://secondroom:9008/barn/ws",
… },
"fullName":"The First Room",
"description":"A helpful room with doors in every possible direction.",
"repositoryUrl":"https://github.com/your-fork",
"doors":{
"n":"A knobbly wooden door with a rough carving or a friendly face",
"w":"A fake wooden door with stickers of friendly faces plastered all over it",
"s":"A warped wooden door with a friendly face branded on the corner",
"e":"A polished wooden door with an inlaid friendly face",
}
}

15.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
The Map Internals, version 1
— Literally a copy of what’s exposed
— Hard to store references to other rooms
— Room pre-allocation and movement make it cumbersom
— No way to (really) delete rooms (!)

16.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
Map.stream().toGraph()
— A Map is a Collection of Rooms connected thru Doors
— X connected toY is… a graph!

17.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
A graph, really?
First
Room
Play
Room
Basement
Dungeon

18.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
Take 1: Neo4J
— Created rooms using Neo4J APIs and Cypher query language
— No easy way to do CRUD operations
◦ Convert from object to Cypher using inspection
— In the end, just changing who was holding our chain…

19.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
Take 2: JNoSQL!

20.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
What is JNoSQL?
— Mapping API - Artemis
— Communication API - Diana
— No lock-in
— Divide and conquer
DAO
Communication
Mapping
JNoSQL

21.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
Eclipse JNoSQL
— Eclipse Foundation
— Apache v2 + EPL 1.0
— API to each NoSQL type
— Configurable
— Extensible Communication
Mapping

22.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
JNoSQL – Diana APIs
Key/Value Document
Column
Family
Graph

23.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
Names & Definitions
— Annotated Entities
— Template
— Repository
— Configuration

24.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
Annotaded Entities
— MappedSuperclass
— Entity
— Column
@Entity
public class Site {
@Id
private Long id;
@Column
private String name;
…
}

25.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
Template
@Inject
private GraphTemplate template;
public Optional<Site> getRecentRoom() {
return template
.getTraversalVertex()
.has("doorAvailable", true)
.<Site>stream()
.sorted(ORDER_WEIGHT)
.findFirst();
}

26.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
Repository
public interface SiteRepository extends Repository<Site, Long> {
Optional<Site> findByName(String name);
}
@Inject
@Database(GRAPH)
private SiteRepository repository;

27.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
Repository
@Transactional
public void save(Site site) {
if (isNull(site.getId())) {
Optional<Site> siteByName = repository.findByName(site.getName());
siteByName.ifPresent(site::merge);
}
repository.save(site);
}
public Optional<Site> findByName(String name) {
return repository.findByName(name);
}

28.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
The future & possibilities

29.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
Why a graph makes MUCH sense?
— Current 2D map isVERY limiting
◦ With a graph we can go 3D!
— Different kinds of objects can be tracked:
◦ Items can be made unique and migrate
— Other doors are possible!

30.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
Why a graph makes MUCH sense?
First
Room
Play
Room
Basement
Dungeon
The
One
Ring
Suite

31.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
Get involved!
— https://gameontext.slack.com
— https://gameontext.org
— http://jnosql.org
— https://github.com/leomrlima/gameon-graph-map

32.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
? & !

33.
GameOn!+JNoSQL
#JavaOne #JNoSQL @KateStanley91 @leomrlima @otaviojava
Thanks!