![Advanced Configuration
grails-app/conf/DataSource.groovy
grails {
neo4j {
type = "embedded"
location = "/var/neo4j"
params = []
}
}](https://image.slidesharecdn.com/neo4j-120402065725-phpapp01/85/Neo4-Grails-33-320.jpg)
![High Availabile
type = "ha”
grails {
neo4j {
type = "ha"
location = "/var/neo4j"
params = [ // see http://docs.neo4j.org/chunked/stable/ha-configuration.html
'ha.server_id': 1,
'ha.coordinators': 'localhost:2181,localhost:2182,localhost:2183'
]
}
}](https://image.slidesharecdn.com/neo4j-120402065725-phpapp01/85/Neo4-Grails-35-320.jpg)
Neo4 + Grails
- 1. Rapid development with Neo4J under Grails
- 2. About Myself • Stanislav Shevchenko • Located in Riga/Latvia • Technical Architect in Accenture • Experience since 10 years • C#/Java/Groovy/Scala/Erlang
- 3. no:sql Market has significantly different challenges in dealing with data that the traditional RDBMS solutions could not cope with.
- 4. Issues • size data sets • data relations are connected • distributed processing • Data Model -> semi-structured approach
- 5. brings to diversity of solutions Data Model Distribution Disk Data Model Structure
- 6. types Document store Graph Key-value store Multivalue databases Object database Tabular Tuple store
- 7. hard to integrate in industrialized companies
- 8. Grails Support Name Type RIAK Eventually‐consistent key‐value + REDIS Key-value cache in RAM + MemcacheDB Ordered key-value stores +- Apache CouchDB Document store + MongoDB Document store + Apache Hadoop Tabular/Big Table + Apache Cassandra Eventually‐consistent key‐value + Neo4J Graph +
- 9. Graph DB implemetations Language DEX C++ FlockDB Scala InfiniteGraph Java HyperGraphDB Java Neo4J Java OpenLink Virtuoso C++, C#, Java, SPARQL OrientDB Java Sones GraphDB C#
- 10. Graph on(in) Grails Neo4j is (as of now) the only graph database that fits nicely in a Grails application.
- 12. Why Graph DB? Insufficient RDBMS performance in hierarchical structures. The graph database storage shines when storing richly-connected data. Querying is performed through traversals, which can perform millions of traversal steps per second. A traversal step resembles a join in a RDBMS.
- 13. SQL addons Some DBs has even special DSL: SELECT empno, ename, job, mgr, hiredate, LEVEL FROM emp WHERE LEVEL <= 2 START WITH mgr IS NULL CONNECT BY PRIOR empno = mgr
- 14. Where Graph DB • Network Management • Master Data Management • Social • Finance • Spatial – Map Routing • Bio
- 15. Why Neo4J? • true ACID transactions • high availability • scales to billions of nodes and relationships • high speed querying through traversals • well documented • Java • licenses
- 16. Why neo4j - details • Disk ready – Native graph storage engine with custom (SSD- ready) binary on-disk format • Transactional – JTA/JTS, XA, 2PC, Tx Recovery, deadlock detection … • Scalable – Billions of nodes on single JVM
- 17. Access & Implementation Types 1. EmbeddedGraphDatabase: just to local JVM 2. RestGraphDatabase: rest-binding 3. HighAvaibleGraphDatabase: uses Zookeeper
- 18. When Grails shines Ruby platform isn’t a case, Java is too expensive, Scala is too smart. Startups & prototypes Model-driven architecture where GORM is fundament.
- 19. Groovy & Grails Architecture Controller View GSP Service Domain Plug-in Gant GORM Site Mesh Spring Hibernate DB Java EE Groovy JVM
- 20. GORM Abstraction on abstractions, wraps: – Hibernate – JPA – Gemfire, Redis, Riak – MongoDB, JCR – Neo4J Integration testing via TCK
- 21. Neo4j plug-in
- 22. Plugin features • Neo4j -> Groovy/Java • GORM dynamic finders, criteria and named queries • Session-managed transactions • Bean Validation • Neo4j's traversal • Embedded, REST and HA
- 23. Jump into Neo4J name:staff type:weapon name:Splinter fullName:Hamato Yoshi type: rat type: interact type:knows name:Shredder fullName:Oroku Saki
- 24. Nodes
- 25. Relationships
- 26. Properties name:staff type:weapon name:Splinter fullName:Hamato Yoshi type: rat type: interact type:knows
- 27. Mapping Reference Node Subreference Domain Class/Type SubreferenceNode Domain Class Instance Instance Domain Class Properties Instance Properties Assocoation
- 28. Compatibility with GORM ✔ ✗ Simple persistence methods HQL queries Dynamic finders Dirty checking methods Criteria queries Composite primary keys Named queries Any direct interaction with the Hibernate API Inheritance Custom Hibernate user types Embedded types Query by example Many-to-many associations (these can be modelled with a mapping class)
- 29. Getting Started grails install-plugin neo4j grails uninstall-plugin hibernate
- 32. Combining Neo4j And Hibernate static mapWith = "neo4j” def hibernateHero = Hero.get(1) hibernateHero.neo4j.save() def neo4jHero = Person.neo4j.get(1)
- 33. Advanced Configuration grails-app/conf/DataSource.groovy grails { neo4j { type = "embedded" location = "/var/neo4j" params = [] } }
- 34. Via REST type = "rest” grails { neo4j { type = "rest" location = "http://localhost:7474/db/data/" } }
- 35. High Availabile type = "ha” grails { neo4j { type = "ha" location = "/var/neo4j" params = [ // see http://docs.neo4j.org/chunked/stable/ha-configuration.html 'ha.server_id': 1, 'ha.coordinators': 'localhost:2181,localhost:2182,localhost:2183' ] } }
- 36. References no:sql http://nosql-database.org/ neo4j http://neo4j.org grails-neo4j plug-in http://jira.grails.org/browse/GPNEO4J http://springsource.github.com/grails-data- mapping/neo4j/manual/guide/index.html
- 37. Questions Q are guaranteed in life – answers aren’t.