How to use NoSQL in Enterprise Java Applications - NoSQL Roadshow Basel
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How to use NoSQL in Enterprise Java Applications - NoSQL Roadshow Basel

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Once you begin developing with NoSQL technologies you will quickly realize that accessing data stores or services often requires in-depth knowledge of proprietary APIs that are typically not designed ...

Once you begin developing with NoSQL technologies you will quickly realize that accessing data stores or services often requires in-depth knowledge of proprietary APIs that are typically not designed for use in enterprise Java applications. Sooner or later you might find yourself wanting to write an abstraction layer to encapsulate those APIs and simplify your application code. Luckily such an abstraction layer already exits: Spring Data.

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  • Spring Data repositories can be composed with interfacesThe implementation is magically provided by Spring Data

How to use NoSQL in Enterprise Java Applications - NoSQL Roadshow Basel How to use NoSQL in Enterprise Java Applications - NoSQL Roadshow Basel Presentation Transcript

  • How to Use NoSQLin Enterprise Java ApplicationsPatrick BaumgartnerNoSQL Roadshow | Basel | 30.08.2012
  • Agenda• Speaker Profile• New Demands on Data Access• New Types of Data Stores• Integrating NoSQL Data Stores• Spring Data Overview• Example with MongoDB• Example with Neo4j• Q&A 2
  • Speaker ProfilePatrick Baumgartner• Senior Software Consultant | Partner• VMware/SpringSource Certified Instructor (Spring Trainer)• Spring Framework, OSGi & agile engineering practices• Co-author of „OSGi für Praktiker“ (Hanser)Swiftmind GmbH http://www.swiftmind.com• Enterprise Java, Spring & OSGi consulting• Spring & OSGi workshops & trainings• Agile engineering practices workshops 3
  • New Demands on Data Access • Structured and unstructured data • Massive amounts of data • Inexpensive horizontal scaling • Apps and data in the cloud • Social network features • … 4
  • New Types of Data Stores 5
  • Integrating NoSQL Data Stores #1We are not architects! http://www.flickr.com/photos/sakeeb/4087246274 6
  • Integrating NoSQL Data Stores #2Don’t re-invent the wheel! http://www.flickr.com/photos/dmott9/5921728819 7
  • Integrating NoSQL Data Stores #3Let’s use Spring! http://www.springsource.org/spring-data 8
  • Spring Data• Same goals as the Spring Framework – Productivity improvement – Programming model consistency – Portability• Umbrella for subprojects, specific to a given database• Mapping support for Java domain objects• http://www.springsource.org/spring-data• http://github.com/SpringSource/spring-data-XXX 9
  • Spring Data – Overview #1 Relational Databases • JPA • JDBC Extensions Big Data • Apache Hadoop Data Grid • GemFire HTTP • REST 10
  • Spring Data – Overview #2 Key Value Stores • Redis Document Stores • Mongo DB Graph Databases • Neo4J Column Stores • HBase Common Infrastructure • Commons 11
  • Spring Data – Key Features• Low level data access API abstraction – MongoTemplate, RiakTemplate, Neo4jTemplate – Exception translation – Transaction management• Object Mapping (Java to data store)• Generic Repository Support – Basic CRUD, dynamic finders, pagination and sorting• Spring namespaces• Cross Store Persistence Programming Model – @Entity, @Document, @NodeEntity 12
  • Spring Data MongoDB – Example 13
  • Documents Stored JSON: { "_id" : ObjectId("4f9886290364b533b3acd4ce"), "_class" : "com.acme.hello.domain.Person", "name" : "Bob", "age" : 33 } 14
  • Spring Data MongoDB – Document@Documentpublic class Person { @Id Stored JSON: private int id; { "_id" : ObjectId("4f9886290364b533b3acd4ce"), "_class" : "com.example.Person", private String name; "name" : "Bob", private int age; "age" : 33 } // getters/setters…} 15
  • Spring Data MongoDB – Configuration 16
  • Spring Data MongoDB – Repository@Repositorypublic class MongoPersonRepository implements BaseRepository<Person> { @Autowired MongoOperations mongoTemplate; Person createPerson(String name, int age){ if(!mongoTemplate.collectionExists(Person.class)){ mongoTemplate.createCollection(Person.class); } Person p = new Person(name, age); mongoTemplate.insert(p) return p; } ...} 17
  • Spring Data Neo4j – Example 18
  • Graph 19
  • Spring Data Neo4j (SDN)• POJOs mapped as nodes or relationships – type safe• Works directly Database, typically embedded mode• Data is fetched very fast and lazy• Stores everything within a @Transaction• Uses heavily AspectJ magic to enhance the POJOs• … 20
  • Spring Data Neo4j – Entity@NodeEntity Nodepublic class Person { private String name; private int age; _type_: com.example.Person name: "Alice" // getters/setters… age: 42}Person alice = new Person();alice.setName("Alice");alice.setAge(42);alice.persist(); 21
  • Spring Data Neo4j – NodeEntity@NodeEntitypublic class Person { private String name; private int yearOfBirth; @RelatedTo(type = "KNOWS", direction = Direction.OUTGOING) private Set<Person> knownPersons; public void knows(Person p) { knownPersons.add(p); } public Set<Person> getFriends() { KNOWS return knownPersons; Alice Bob }}Person alice = ...;alice.knows(bob);alice.knows(carol); KNOWS Carol 22
  • Spring Data Neo4j – Relationship@RelationshipEntitypublic class Knows { private int sinceYear; public Knows since(int year) { this.sinceYear = year; return this; }}@NodeEntitypublic class Person { public Known knows(Person p) { return this.relateTo(p, Knows.class, "KNOWS"); }}Person alice = ...;Person bob ...; KNOWSalice.knows(bob).since(2012); Alice Bob since: 2012 23
  • Spring Data Neo4j – Repositorypublic interface PersonRepository extendsGraphRepository<Person> { @Query("start person = {0} match ... return ...") Iterable<Product> getOwnedServices(Person person); Iterable<Person> findByName(String name); Iterable<Person> findByNameLike(String name);}@AutowiredPersonRepository personRepository;Person alice = personRepository.findByName("Alice"); 24
  • Spring Data Neo4j – Querying• Several possibilities implemented to query the graph – Neo4j API – Traversal descriptions – Graph algorithms – Index queries – Cypher queries 25
  • Give it a try!Use a data model which really matches to your data … http://www.flickr.com/photos/juniorvelo/3267647833 26
  • 05.09.2012 /ch/open Workshop-TageNoSQL für Java Enterprise Anwendungen mit Spring Data 4th – 6th September http://www.flickr.com/photos/4nitsirk/5211251578 27
  • Q&APatrick Baumgartnerpatrick.baumgartner [at] swiftmind [dot] comhttp://www.swiftmind.com http://www.twitter.com/patbaumgartner 28