Intro to Spring Data Neo4j

Spring Data Neo4j 2.1 IntroductionMichael Hunger, Neo Technology

Me & You ? ๏ Me: Michael Hunger, Neo Technology • Neo4j Community Team • Spring Data Neo4j Project Lead • Neo4j Cloud Hosting • michael.hunger@neotechnology.com / @mesirii ๏ You: • Java & Spring ! • Enterprise ? • NOSQL ? • Cloud (CF, Heroku) ?

About the Webinar ๏ Graphs are EveryWhere ๏ Graph Database ๏ Intro Neo4j ๏ Sample App - Twitter Graph • Domain Model • Code ๏ Resources, Books, GraphConnect ๏ Questions answered during webinar and Q & A at the end ๏ All your questions will be answered in a follow up blog post, don‘t hesitate to ask

To become part of todays Twitter-Graph

To become part of todays Twitter-Graphplease tweet with #neo4j #sdn

To become part of todays Twitter-Graphplease tweet with #neo4j #sdn •your attendance •questions •remarks •....

Graphs areeverywhere 5

Science76

ScienceBiologyChemistry 7 6

ScienceBiologyChemistry Proteins Reactions Environments 7 6 Genes

Science Biology Chemistry Proteins Reactions Politics Environments 7 6 GenesSociety History

Science Biology Work FriendsNeighbor Family Chemistry Proteins Reactions Politics Environments 7 6 Genes Society History

Computers Internet Science Biology Work FriendsNeighbor Family Chemistry Proteins Reactions Politics Environments 7 6 Genes Society History

Devices Users Software Networks Services Computers Internet Science Biology Work FriendsNeighbor Family Chemistry Proteins Reactions Politics Environments 7 6 Genes Society History

Devices Users Software Networks Services Computers Internet Business Science Biology Work FriendsNeighbor Family Chemistry Proteins Reactions Politics Environments 7 6 Genes Society History

Devices Users Software Networks Services Computers Internet Business Science ERP Biology Work Geo Friends RetailNeighbor Family Cloud Chemistry Travel Proteins Reactions Politics Environments 7 6 Genes Society History

Devices Users Software Networks Services Computers Internet Art Business Science ERP Biology Work Geo Friends RetailNeighbor Family Cloud Chemistry Travel Proteins Reactions Politics Environments 7 6 Genes Society History

Devices Stories Users Software Creativity Visuals Networks Services Computers Internet Art Business Science ERP Biology Work Geo Friends RetailNeighbor Family Cloud Chemistry Travel Proteins Reactions Politics Environments 7 6 Genes Society History

A Graph Database Node Node

A Graph Database Typed relationship Node Node

A Graph Database Typed relationship Node Node key: value key: value

Neo4j Intro

Java N D _I N TE E ME PL IM10

Java N D _I N TE E ME PL IM Server RUN S_A SRuby JS S _APython Java NS .net RUSpring embedded 10

Java N D _I N TE E ME PL IM Server RUN S_A SRuby RU JS S _A NSPython Java _O NS .net RU NSpring embedded Heroku 10

Java N D _I N TE E ME PL IM PROVIDES ACID Server RUN S_A TX SRuby RU JS S _A NSPython Java _O NS .net RU NSpring embedded Heroku 10

Java Lucene N D _I TE Index N ME ES E T PL RA G IM TE IN PROVIDES ACID Server RUN S_A TX SRuby RU JS S _A NSPython Java _O NS .net RU NSpring embedded Heroku 10

Java Lucene N D _I TE Index N ME ES E T PL RA G IM TE IN PROVIDES ACID Server RUN S_A TX S ORuby RU ES_T JS S _A NSPython Java _O NS SC AL .net RU NSpring 34bn embedded Heroku Nodes 10

Java Lucene 1 M/s N D _I TE Index N ALS ME ES VERS E T PL RA G IM TE TRA IN PROVIDES ACID Server RUN S_A TX S ORuby RU ES_T JS S _A NSPython Java _O NS SC AL .net RU NSpring 34bn embedded Heroku Nodes 10

Java Lucene 1 M/s Master/ N D _I Slave TE Index N ALS ME HIG H_A ES VERS E VA T PL IL. RA G IM TE TRA IN PROVIDES ACID Server RUN S_A TX S ORuby RU ES_T JS S _A NSPython Java _O NS SC AL .net RU NSpring 34bn embedded Heroku Nodes 10

Java Lucene 1 M/s Master/ N D _I Slave TE Index N ALS ME HIG H_A ES VERS E VA T PL IL. RA G IM TE TRA IN PROVIDES ACID Server RUN S_A LI CE TX S NS ED _L IK ORuby RU E ES_T JS MySQL S _A NSPython Java _O NS SC AL .net RU NSpring Mongo 34bn embedded Heroku Nodes 10

IntroducingThe Twitter-Graph Domain Model

Whiteboard it - abstract :Tweet :Tweet

Whiteboard it - abstract :User PO ST ED :Tweet :User :Tweet POSTED

Whiteboard it - abstract :User PO ST ED TAGGED :Tag :Tweet TAGG ED :Tag ED G AG :User :Tweet T POSTED

Whiteboard it - abstract :User PO ST ED TAGGED :Tag :Tweet TAGG ED :Tag NS O ED TI G MEN AG :User :Tweet T POSTED

Whiteboard friendly - example Attending the #SDN #Neo4j webinar by @mesirii Looking forward to my #SDN webinar

Whiteboard friendly - example @peterneubauer PO ST ED Attending the #SDN #Neo4j webinar by @mesirii Looking forward@mesirii to my #SDN webinar POSTED

Whiteboard friendly - example @peterneubauer PO ST ED TAGGED #Neo4j Attending the #SDN #Neo4j TAGG webinar by ED @mesirii #SDN ED G Looking forward TAG@mesirii to my #SDN webinar POSTED

Whiteboard friendly - example @peterneubauer PO ST ED TAGGED #Neo4j Attending the #SDN #Neo4j TAGG webinar by ED @mesirii #SDN NS O ED TI G MEN Looking forward TAG@mesirii to my #SDN webinar POSTED

Cypher Query Language๏ Declarative query language • Describe what you want, not how • Based on pattern matching๏ Examples: START peter=node:User(userName=”peterneubauer”) # index lookup MATCH peter-[:POSTED]->tweet-[:MENTIONS]->user WHERE user.country = ”SE” and not peter-[:FOLLOWS]-user RETURN user START tag=node:Tag(tag = ”Neo4j”) MATCH tag<-[:TAGGED]-tweet-[:TAGGED]->co_tag RETURN co_tag.tag, COUNT(*) as cnt ORDER cnt DESC LIMIT 10 14

Spring Data Neo4j 2.1

Spring Data๏ Spring Data: VMWare/SpringSource initiative to give Spring developers easy access to the emerging world of NOSQL๏ Build on top of common infrastructure๏ Spring Data Neo4j is the integration library for Neo4j๏ http://springsource.org/spring-data๏ Support for other NOSQL approaches • Redis • MongoDB • Hadoop • GemFire

Spring Data Neo4j ๏ The brain child of Rod Johnson & Emil Eifrém • Wrote functional initial prototype • Developed by Neo Technology and SpringSource teams ๏ Uses annotations to deﬁne graph entities ๏ Entity state backed by graph database ๏ Two modes of Object Graph Mapping • simple POJO Graph Mapping • advanced, seamless AspectJ backed Mapping ๏ SD-Repositories support ๏ Neo4j Server Support

Classic Neo4j domain classpublic class Tag { private final Node underlyingNode; Tag( final Node node ) { underlyingNode = node; } public Node getUnderlyingNode() { return underlyingNode; } public final String getTag() { return (String) underlyingNode.getProperty( “tag” ); } public void setTag( final String tag ) { underlyingNode.setProperty( “tag”, tag ); }}

Spring Data Neo4j domain class@NodeEntitypublic class Tag { @GraphId private Long id; private String tag;}

Spring Data Neo4j domain class@NodeEntitypublic class Tag { @GraphId private Long id; @Indexed(unique = true) private String tag;}

Defining entity classes

Defining entity classes• @NodeEntity • Represents a node in the graph • Fields saved as properties on node • References stored as relationships between nodes • Instantiated using Java ‘new’ keyword, like any POJO • Also returned by lookup mechanisms • Type information stored in the graph

Defining entity classes

Defining entity classes• @RelationshipEntity • Represents a relationship in the graph • Fields saved as properties on relationship • Special ﬁelds for start- and end-nodes • Only returned by lookup methods

Tweet domain class@NodeEntitypublic class Tweet { @GraphId private Long id; @Indexed(unique=true) Long tweetId; String text; @Fetch User sender; // eager loading @RelatedTo(type="TAGGED") Collection<Tag> tags; @RelatedTo(type="MENTIONS") Set<User> mentions; @RelatedTo(type="SOURCE") Tweet source;}

Compare to Core-API approach@NodeEntityclass Tweet { ... public Collecti on<Tag> getTags final List<Tag> () { tags = new Link for ( Relations edList<Tag>(); hip rel : under RelTypes.TAGGED lyingNode.getRe , Direction.OUT lationships( movies.add( new GOING ) ) { Tag( rel.getEnd Old } Node() ) ); return tags; } @RelatedTo(type="TAGGED") gs; New private Collection<Tag> ta

Interface based Repositories๏ based on Repository infrastructure in Spring Data Commons๏ just deﬁne the interface and the namespace conﬁguration๏ provide out-of-the-box support for • CRUD-Operations • Index-Lookups • Traversal-Execution • Annotated Graph-Queries (Cypher, Gremlin) • Derived Queries • Spatial Queries๏ extensible via custom methods with provided implementations 24

Repositoriesinterface TweetRepository extends GraphRepository<Tweet> { Tweet findByTweetId(String id); Collection<Tweet> findByTagsTag(String tag);}<neo4j:repositories base-package=“org.neo4j.twitter_graph.repositories„/>@Controllerpublic class TwitterController { @Autowired TweetRepository tweetRepository; @RequestMapping(value = "/tweet/{id}",...) public String show(Model model, @PathVariable String id) { Tweet tweet = tweetRepository.findByTweetId(id); model.addAttribute("tweet", tweet); return "/tweet/show"; }} 25

Neo4j-Template (I)๏ well known Spring Template Pattern๏ Resource / Transaction Management๏ Convenience Methods๏ Nodes and Entities handling & conversion๏ Fluent Query Result Handling๏ Works also via REST with Neo4j-Server๏ Exception Translation 26

REST-Client-Support <bean id="restGraphDatabaseService" class="org.sf.data.neo4j.rest.SpringRestGraphDatabase"> <constructor-arg value="http://localhost:7473/db/data" /> </bean> <neo4j:config graphDatabaseService="restGraphDatabaseService"/> ๏ drop-in replacement for the embedded GraphDatabase ๏ works transparently with POJO-Entity-Mapping and Neo4j-Template 27

Coding the Twitter-Graph 28

Todays Coding Exercise๏ uses Spring Social (minimally)๏ Simple Domain: Tweets, Users, Tags • connected Entities • Repositories, Service๏ standalone App with • embedded Neo4j-Database • (local Neo4j-Server) 29

Spring Data Neo4j Guidebook “Good Relationships”“I’m excited about Spring Data Neo4j.... Spring Data Neo4j makes workingwith Neo4j amazingly easy, and therefore has the potential to make youmore successful as a developer.” Rod Johnson, founder of Spring๏ Spring Data Neo4j comes with a great Guide Book, featuring: • Forewords by Rod Johnson and Emil Eifrem • Ancineasts.net narrative tutorial walkthrough for easy to read, • A comprehensive reference for all the details • Check it out: http://bit.ly/sdn-book • Free e-book and printed 30

http://cineasts.net Check Out: http://spring.neo4j.org/tutorial

O‘Reilly Spring Data Book „Modern Data Access for Enterprise Java“ • upcoming book by the Spring Data project leads • introduction to Spring Data & SD-repositories • covers all subprojects • available in O‘Reilly OFPS and O‘Reilly store (e-book) • http://bit.ly/sd-ofps 32

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Continue here ๏ See the Spring Data Neo4j site for more info: http://spring.neo4j.org ๏ Again, don’t miss our guidebook on Spring Data Neo4j published by InfoQ also printed http://bit.ly/sdn-book ๏ All about Neo4j: ๏ local Neo4j meetup groups http://neo4j.org http://neo4j.meetup.com ๏ Neo4j & SDN videos and webinars: http://video.neo4j.org ๏ Spring Data Forum at http://spring.neo4j.org/discussions ๏ Neo4j Google Group • http://neo4j.org/forums

Thank You!Feel free to reach out with questions on•Twitter,•Spring-Forums,•Neo4j-Google-Group•Stack-Overﬂow 35

http://blog.neo4j.org	527
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Intro to Spring Data Neo4j

by jexp on Jul 26, 2012

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