Cassandra java libraries
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This document discusses three Java libraries for working with Cassandra: Cassandra Unit, the Java Driver Object Mapper module, and Achilles. Cassandra Unit allows embedding a Cassandra server for unit testing. The Java Driver Object Mapper provides annotations for object mapping like JPA with a templating system. Achilles is a more full-featured library that started later, providing features like schema validation, dynamic logging, and batch operations. It also has plans for asynchronous APIs and integration with Elasticsearch.
Cassandra java libraries
- 1. Cassandra Java Libraries DuyHai DOAN, Technical Advocate @doanduyhai
- 2. Agenda! @doanduyhai 2 Cassandra Unit Java Driver Mapping Module Achilles
- 3. Cassandra Unit! @doanduyhai 3 • start an embedded Cassandra server • useful for unit testing • mature project, created at August 5th 2011 • designed around Thrift & Hector • propose a JUnit rule for CQL
- 5. Java Driver Object Mapper! @doanduyhai 5 • simple mapper • KISS • annotations à-la JPA (but no JPA dependencies) • templating system à-la Spring Data
- 6. Java Driver Object Mapper! Mapping @doanduyhai 6 @Table(keyspace = "mapper_module", name = "users") public class User { @PartitionKey private String login; private String name; // getters and setters omitted... }
- 7. Java Driver Object Mapper! Usage @doanduyhai 7 MappingManager manager = new MappingManager(session); Mapper mapper = manager.mapper(User.class); User user = mapper.get("jdoe@fiction.com"); mapper.saveAsync(new User("hsue@fiction.com")); mapper.delete("jdoe@fiction.com");
- 8. Java Driver Object Mapper! Accessors (SpringData template-like) definition @doanduyhai 8 @Accessor interface UserAccessor { @Query("SELECT * FROM users LIMIT :max") Result<User> firstNUsers(@Param("max") int limit); }
- 9. Java Driver Object Mapper! @doanduyhai 9 Accessors usage UserAccessor accessor = manager.createAccessor(UserAccessor.class); List<User> users = accessor.firstNUsers(10).all(); for (User user : users) { System.out.println( profile.getAddress().getZip() ); }
- 10. Java Driver Object Mapper Demo
- 11. Achilles! @doanduyhai 11 Why ? • started in late 2012, when mapper module did not exists • more involved and more features than the mapper module • different annotations set (may converge)
- 12. Achilles Demo
- 13. Achilles Architecture! @doanduyhai 13 Entities Parsing Schema Validation Prepare Statements Custom Configs Meta Data Dirty Checking (opt.) Interceptors Type Encoding Dynamic Logging Object Mapping Proxy Building (opt.) Bootstrap Runtime
- 14. Main API! @doanduyhai 14 manager.insert(entity) manager.update(entity) manager.remove(entity) manager.find(Entity.class, primaryKey)
- 15. Main API! @doanduyhai 15 Slice query, typed query RegularStatement select = select().from(“user_messages”) .where(eq(“user_id”,bindMarker())) .and(gte(asList(“message_folder”), bindMarker())) .and(lt(asList(“message_folder”, “date”), bindMarker())) .limit(10); List<Message> messages = manager.typedQuery(Message.class, select, userId, asList(“forums”), asList(“forums”, uuid1)) .get();
- 16. Main API! @doanduyhai 16 Native query RegularStatement nativeQuery = new SimpleStatement(“SELECT * FROM Message WHERE … LIMIT 1”); TypedMap firstMessage = manager.nativeQuery(nativeQuery).first(); String interlocutor = firstMessage.getTyped(“interlocutor”); //Or String interlocutor = firstMessage.<String>getTyped(“interlocutor”);
- 17. Main API! @doanduyhai 17 Counter Batch mode Strategies (insert, naming) Options
- 18. Documentation! @doanduyhai 18 Comprehensive Github WIKI Twitter-clone demo app (demo.achilles.io) Versioned documentation (HTML & PDF) JavaDoc
- 19. RoadMap! @doanduyhai 19 Asynchronous API (branch Asynchronous) • main API ( insert(), update(), …) • slice, typed & native queries C* 2.1 user defined types (UDT) Reactive ? (RxJava) ElasticSearch integration (@olivierbourgain)
- 20. ! " ! Q & R
- 21. Thank You @doanduyhai duy_hai.doan@datastax.com https://academy.datastax.com/