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1 für Java Entwickler und Architekten - Schema Evolution und Maintenance { } "name" : "Timmo Freudl-Gierke", "twitter" : "@timmo_gierke", "blog" : "

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4 humongous enorm gigantisch riesig

5 Schema Free

6 Hierarchie

7 BSON Open Source GNU AGPL v3.0. Apache License v2.0.

8 Ziel Platformen

9 Mongo Konsole

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12 Continuous Deployment Später mehr...

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14 Application Domain Model Schema / JSON Structure { } name : "Schulze", strasse : "Sonntagstr. 20", plz : "10245", ort : "Berlin",

15 MongoDB Java Driver DBObject document = new BasicDBObject("name", "Schulze"); document.put("strasse", "Sonntagstr. 20");... { } "_id" : ObjectId("4f7258da dfe6a1a8"), "name" : "Schulze", "strasse" : "Sonntagstr. 20"

16 Unit Test - Setup

17 Unit Test - Mongo Driver

18 Object - Document Mapper Spring Data MongoDB Jackson Mapper MongoTemplate Exception Translation Rich Object Mapping Lifecycle Events Repository Support Wraps Mongo DB + Collection API Full Jackson Extensibility Fast javax.persistence style Annotation Based Mapping DAO Support

19 Unit Test

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21 1) 3) 2) 1)

22 1) { name : "Schulze", strasse : "Sonntagstr. 20", plz : "10245", ort : "Berlin", } 2) { name : "Schulze", adresse : { strasse : "Sonntagstr. 20", plz : "10245", ort : "Berlin", } } 1) 3) { name : "Schulze", adresse : { strasse : "Sonntagstr.", hausnummer : "20", plz : "10245", ort : "Berlin", } }

23 1 Javascript

24 1 Javascript Field Renaming {$rename : {"oldfieldname" : "newfieldname"} } db.personen.update({},{$rename:{"strasse":"adresse.strasse"}},0,1) db.personen.update({},{$rename:{"plz":"adresse.plz"}},0,1) db.personen.update({},{$rename:{"ort":"adresse.ort"}},0,1)

25 1 Javascript Field Splitting var personen = db.personen.find({}) personen.foreach( function(p) { if (p.adresse!= null) { var original = p.adresse.strasse var strasse = original.match(/[a-za-z\.]+/)[0] var nummer = original.match(/[0-9]+[a-z]*/)[0] p.adresse.strasse = strasse p.adresse.hausnummer = nummer db.personen.save(p) }})

26 1 Javascript Console Skripting > mongo setup.js migrate.js teardown.js

27 1 Javascript Console Skripting D E M O

28 2 Java

29 2 Java MigrateAdresse.java DBObject person =... DBObject adresse = new BasicDBObject(); adresse.put("strasse", person.get("strasse")); adresse.put("plz", person.get("plz")); adresse.put("ort", person.get("ort")); person.put("adresse", adresse); person.removefield("strasse"); person.removefield("plz"); person.removefield("ort"); collection.save(person);

30 2 Java MigrateAdresse.java copy(person, "strasse", "adresse.strasse") copy(person, "plz", "adresse.plz") copy(person, "ort", "adresse.ort") collection.save(person);

31 2 Java public void testmigrateadresse() { // given String json = getfileasjson(this.getclass(), "person_v1.json"); DBObject person = (DBObject) JSON.parse(json); // when new MigrateAdresse().migrate(person); // then DBObject adresse = (DBObject) person.get("adresse"); assertthat(adresse.get("plz")).isequalto("10245"); }

32 Migration vor Deployment (1) Produktiv System (2)

33 Continuous Deployment Produktiv System 25 / Tag

34 Continuous Deployment

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36 On the fly version conversion 3 Java On the fly conversion

37 3 Java On the fly conversion { "class" : "Person", { "name":"schulze", "strasse":"sonntagstr. "class":"person", 20", "plz":"10245", "name":"schulze", { "ort":"berlin" "adresse":{ } "class":"person", "strasse":"sonntagstr. 20", "name":"schulze", "plz":"10245", "adresse":{ "ort":"berlin" }}"strasse":"sonntagstr.", "hausnummer":"20", "plz":"10245", "ort":"berlin" }} v1 v2 v3

38 3 Java On the fly conversion

39 3 Java On the fly conversion Version Converter Beispiel

40 3 Java On the fly conversion Version Converter Unit Test

41 3 Java On the fly conversion Composite Version Converter Beispiel public class PersonVersionConverter extends CompositeVersionConverter { model Version.txt 3 public PersonVersionConverter() { setcurrentversion(getfilecontent("/domainmodel-version.txt")); registerconverter(new VersionConverter_1to2_Adresse()); registerconverter(new VersionConverter_2to3_HausnummerExtraktion()); //... }

42 3 Java On the fly conversion Composite Version Converter Integrations Test { "class" : "Person", "name":"schulze", "strasse":"sonntagstr. 20", "plz":"10245", "ort":"berlin" } v1 { "class":"person", "name":"schulze", "adresse":{ "strasse":"sonntagstr. 20", "plz":"10245", "ort":"berlin" }} v2 { "class":"person", "name":"schulze", "adresse":{ "strasse":"sonntagstr.", "hausnummer":"20", "plz":"10245", "ort":"berlin" }} v3

43 3 Java On the fly conversion Version Conversion Integrations Test

44 3 Java On the fly conversion Queries personen = getcollection().find(querybuilder().put("name").is("schulze")) personen.addall( getcollection().find(querybuilder().put("name").is("schulze")) ) personen.addall( getcollection().find(querybuilder().put("neuername").is("schulze")) )

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49 Domain Model JSON Structure

50 Schema Evolution 1 Javascript 2 Java 3 Java On the fly

51 Ausblick VersionConversion integration in OD Mapper MongoDB User Group Berlin in

52 für Java Entwickler und Architekten - Schema Evolution und Maintenance { } "name" : "Timmo Freudl-Gierke", "twitter" : "@timmo_gierke", "blog" : "