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Introduction to terrastore
- 1. Introduction to Terrastore Sven Johansson Mejsla @svjson Mats Henricson Crisp @matshenricson
- 2. NoSQL - A loosely defined movement - A complement to relational databases - Usually schema-less - Typically not concerned with transactions, locks or data integrity... - ...but more so with performance and scalability
- 5. RavenDB (C#)
- 7. Terrastore - Open source project founded in Sept-Oct 2009 - Written entirely in Java - Based on Terracotta - Offers per-document consistency - Distributed - Elastic - Scalable at the computational level - Extensible
- 8. A Terrastore document { 'name' : 'Sven Johansson', 'age' : '29', 'titles' : [ 'Developer', 'Consultant', 'Destroyer of worlds', ], 'currentlyReading : { title: 'The book of Dave' author: 'Will Self' } 'favouriteBooks' : [{ title: 'The naked and the dead', author: 'Norman Mailer' }, { title: 'On the road', author: 'Jack Kerouac' }] }
- 9. public class Person { private String name; private int age; private String[] titles; private Book currentlyReading; private List<Book> favouriteBooks; ... } ...and a corresponding Java Object
- 10. Deployment architecture Single cluster - 1 Master - n Servers ( n hot standbys)
- 11. Deployment architecture Multi-cluster (Ensemble) - Cluster of n Masters - n Servers each
- 12. CRUD with Terrastore Mats Henricson Crisp AB Stockholm 2010-09-14, WTFPL license
- 13. Example public class Customer { private String name; private Address address; private List<PhoneNumber> phoneNumbers = new LinkedList<PhoneNumber>(); // ... } public class Address { private String street; // ... } public class PhoneNumber { private String number; private String type; // … } } Stockholm 2010-09-14, WTFPL license
- 14. Annotations? Base classes? Nope. The POJO:s are plain vanilla vanilla POJO:s Stockholm 2010-09-14, WTFPL license
- 16. One bucket for item data
- 17. One bucket for orders Stockholm 2010-09-14, WTFPL license
- 18. First we need a terrastore client That localhost URL points to a terrastore server . If that server goes down, then your client is toast. Next version of the API have implemented fallbacks. Enough! I want an example, now! TerrastoreClient client = new TerrastoreClient("http://localhost:8080", new HTTPConnectionFactory()); Stockholm 2010-09-14, WTFPL license
- 19. Customer lindex = new Customer("Lindex"); Address dg = new Address("Drottninggatan 77"); PhoneNumber work = new PhoneNumber("1234567", "work"); PhoneNumber home = new PhoneNumber("2345678", "home"); // Set relationships lindex.setAddress(dg); lindex.addPhoneNumber(work); lindex.addPhoneNumber(home); Now lets create the POJO:s Stockholm 2010-09-14, WTFPL license
- 20. BucketOperation customers = client.bucket("customers"); // Create: customers.key("lindex").put(lindex); // Read: Customer l = customers.key("lindex").get(Customer.class); // Important: l != lindex // Delete: customers.key("lindex").remove(); Create, Read and Delete You can update a document with another put() Stockholm 2010-09-14, WTFPL license
- 22. Get for non-existing keys will throw KeyNotFoundException
- 23. You can import and export whole buckets to file for backup
- 24. You can get all documents in a bucket
- 25. You can get n documents in a bucket
- 26. You can get all documents within a key range
- 27. You can read old documents into objects of updated classes No, there is a lot more cool stuff! Stockholm 2010-09-14, WTFPL license
- 28. Search example with ranges Map<String, Customer> customers = customersBucket.range("lexical-asc") .from("brothers").to("lindex") .limit(10).get(Customer.class); Stockholm 2010-09-14, WTFPL license
- 29. String xpath = "jxpath:/address/street[.='Drottninggatan 77']"; Map<String, Customer> dgCustomers = customersBucket.predicate(xpath).get(Customer.class); assertTrue(dgCustomers.containsValue(lindex)); XPath! Internally using JXPath. Stockholm 2010-09-14, WTFPL license