Dropwizard. A RESTful Love Story. Ryan Kennedy Core Yammer

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1 Dropwizard A RESTful Love Story Ryan Kennedy (@rckenned) Core Yammer

2 Dropwizard A RESTful Love Story Ryan Kennedy (@rckenned) Core Yammer + MicrosoE

3 What on earth is Dropwizard?

5 Some bearded jerk in a pointy hat

6 or

8 Started at Yammer as three services with largely copy/pasted code

9 By service number three we idenofied and disolled the paqern

10 What was the paqern?

11 Dropwizard has out- of- the- box support for sophisocated configuraoon, applicaoon metrics, logging, operaoonal tools, and much more, allowing you and your team to ship a producoon- quality HTTP +JSON web service

12 Dropwizard has out- of- the- box support for sophisocated configuraoon, applicaoon metrics, logging, operaoonal tools, and much more, allowing you and your team to ship a producoon- quality HTTP +JSON web service

13 YAML configuraoon file

14 hqp: port: 8080 adminport: 8081 # a string foo: foo value # a duraoon bar: 60 seconds # a number baz: 10101

15 ConfiguraOon validaoon

16 public class MyAppConfiguraOon extends ConfiguraOon private String private DuraOon bar private long baz = 1; }

17 Dropwizard has out- of- the- box support for sophisocated configuraoon, applicaoon metrics, logging, operaoonal tools, and much more, allowing you and your team to ship a producoon- quality HTTP +JSON web service

19 Gauges Metrics.newGauge(My.class, jobs", new Gauge<Integer>() public Integer value() { return queue.size(); } } );

20 Counters Counter pendingjobs = Metrics.newCounter(My.class, jobs"); public void addjob(job job) { pendingjobs.inc(); queue.offer(job); } public Job takejob() { pendingjobs.dec(); return queue.take(); }

21 Meters Meter requests = Metrics.newMeter( My.class, "requests", "requests", TimeUnit.SECONDS); public void handlerequest(request request, Response response) { requests.mark(); // etc }

22 Histograms Histogram responsesizes = Metrics.newHistogram( My.class, "response- sizes"); public void handlerequest(request request, Response response) { // etc int length = response.getcontent().length; responsesizes.update(length); }

23 Timers Timer responses = Metrics.newTimer(My.class, "responses", TimeUnit.MILLISECONDS, TimeUnit.SECONDS); public String handlerequest(request request, Response response) { final TimerContext context = responses.ome(); try { // etc; return "OK"; } finally { context.stop(); } }

24 Health Checks public class DatabaseHealthCheck extends HealthCheck public Result check() throws ExcepOon { if (database.isconnected()) { return Result.healthy(); } else { return Result.unhealthy("Cannot connect to db ); } } }

25 Dropwizard has out- of- the- box support for sophisocated configuraoon, applicaoon metrics, logging, operaoonal tools, and much more, allowing you and your team to ship a producoon- quality HTTP +JSON web service

26 JMX ReporOng

27 HTTP ReporOng

28 Metrics hqp://host:adminport/metrics

31 Metrics reporters can be added to adapt dropwizard metrics to your collecoon system of choice

32 Health Checks hqp://host:adminport/healthcheck

34 Thread Dumps hqp://hostname:adminport/threads

36 Ping hqp://hostname:adminport/ping

38 Dropwizard has out- of- the- box support for sophisocated configuraoon, applicaoon metrics, logging, operaoonal tools, and much more, allowing you and your team to ship a producoon- quality HTTP +JSON web service

39 Dropwizard provides its own applicaoon logging abstracoon

40 HTTP request logging is supported as well

41 Dropwizard provides log file rotaoon and compression

42 Dropwizard has out- of- the- box support for sophisocated configuraoon, applicaoon metrics, logging, operaoonal tools, and much more, allowing you and your team to ship a producoon- quality HTTP +JSON web service

43 The unbeatable Jackson

44 Dropwizard has out- of- the- box support for sophisocated configuraoon, applicaoon metrics, logging, operaoonal tools, and much more, allowing you and your team to ship a producoon- quality HTTP +JSON web service

45 Dropwizard embeds JeQy for all your HTTP serving needs

46 JAX- RS (JSR- 311) for all your RESTful needs

47 @Path( /users/{id} ) public class UserResource public User get(@pathparam( id ) long id) { return db.finduserbyid(id); } public User update(@pathparam( id ) long id, User user) { return db.updateuser(id, user); }

48 How Yammer uses Dropwizard

49 Lots of small services 16 and counong

50 Maven is our friend

51 SOck the code in GitHub

52 Shade your JARs

53 Get yourself some cononuous integraoon

54 Write yourself a startup script

55 Have a good deploy story

56 Over Ome, Dropwizard has grown a few appendages

57 Dropwizard Client HQpClient or JerseyClient flavors

58 Dropwizard DB JDBI as a service

59 Dropwizard AuthenOcaOon Abstracted authenocaoon providers for OAuth 2 and Basic Auth

60 An public class MyResource public MyResponse = false) Token token) { if (token!= null) { return new MyResponse(getUser(token)); } else { return new MyResponse(getGuestUser()); } } }

61 Dropwizard Views Full blown applicaoon UIs or just a nice admin interface

62 Dropwizard Scala The original Dropwizard for those who don t know any beqer

63 Dropwizard TesOng Test JSON representaoons and resources

64 I blew through that preqy quickly, fortunately you have hqp://dropwizard.codahale.com/

65 And the sample applicaoon hqps://github.com/codahale/ dropwizard

66 And (hopefully) Ome for quesoons! Also WE RE HIRING!

Microservices To-Go mit Dropwizard

Microservices To-Go mit Dropwizard Mario Goller Software Engineer, Swisscom AG mario.goller@swisscom.com Java Forum Stuttgart 2017 Excursion: Architecture Comparison Monolith: multiple modules in the same