Microservices - are your frameworks ready?

Slides for our talk at #microXchg, Berlin. More info available at https://www.innoq.com/en/talks/2015/02/microservices-jvm-applications-talk/

1. Microservices Are your Frameworks ready? Martin Eigenbrodt | martin.eigenbrodt@innoq.com Alexander Heusingfeld | alexander.heusingfeld@innoq.com
2. Microservices?
3. Levels of Architecture
5. Domain architecture
6. Macro (technical) architecture Domain architecture
7. JRuby C# Scala Groovy
 Java Clojure
8. RDBMS NoSQL K/V RDBMS RDBMS/DWH NoSQL
 DocDB
9. RDBMS NoSQL K/V RDBMS RDBMS/DWH NoSQL
 DocDB Micro architecture
10. Challenges
12. Challenges
13. Challenges > many services to take care of
14. Challenges > many services to take care of > distributed system
15. Challenges > distributed configuration > service registration & discovery > resilience > fast, automated deployment > metrics
16. Macro- vs. Micro Architecture
17. Frameworks
18. Dropwizard
19. Dropwizard > Glue Code for well known libraries > Java
20. Dropwizard libraries
21. Dropwizard libraries > Jetty
22. Dropwizard libraries > Jetty > Jersey
23. Dropwizard libraries > Jetty > Jersey > Metrics
24. Dropwizard libraries > Jetty > Jersey > Metrics > Jackson > Guava > Logback > Hibernate Validator > Apache Http Client > JDBI > Liquibase > Freemarker & Mustache > Joda
25. Spring Boot and Spring Cloud
26. Spring Boot
27. Spring Boot > convention over configuration approach
28. Spring Boot > convention over configuration approach > Java, Groovy or Scala
29. Spring Boot > convention over configuration approach > Java, Groovy or Scala > self-contained jar or war
30. Spring Boot > convention over configuration approach > Java, Groovy or Scala > self-contained jar or war > tackles dependency-hell via pre-packaging
31. Spring Cloud
32. Spring Cloud > umbrella project for cloud connectors
33. Spring Cloud > umbrella project for cloud connectors > On top of Spring Boot
34. Spring Cloud > umbrella project for cloud connectors > On top of Spring Boot > config server for distributed configuration
35. Spring Cloud > umbrella project for cloud connectors > On top of Spring Boot > config server for distributed configuration > annotations for service-discovery & resilience
36. Play 2
37. Play 2 > Java or Scala > based on Akka > strong async support
38. Configuration
39. Play - Typesafe Config
40. Play - Typesafe Config > Config Library used by akka, play and other
41. Play - Typesafe Config > Config Library used by akka, play and other > HOCON - JSON Data Model + syntactic sugar
42. Play - Typesafe Config > Config Library used by akka, play and other > HOCON - JSON Data Model + syntactic sugar > override via system property
43. Play - Typesafe Config > Config Library used by akka, play and other > HOCON - JSON Data Model + syntactic sugar > override via system property > rich merge and include possibilities
44. Spring Boot @ComponentScan
 @EnableAutoConfiguration
 public class OrderApp {
 
 public static void main(String[] args) {
 SpringApplication.run(OrderApp.class, args);
 }
 }
45. Spring Boot @ComponentScan
 @EnableAutoConfiguration
 public class OrderApp {
 
 public static void main(String[] args) {
 SpringApplication.run(OrderApp.class, args);
 }
 }
46. Spring Boot > HTTP resource “/autoconfig” shows all properties @ComponentScan
 @EnableAutoConfiguration
 public class OrderApp {
 
 public static void main(String[] args) {
 SpringApplication.run(OrderApp.class, args);
 }
 }
47. Spring Boot > HTTP resource “/autoconfig” shows all properties > overwrite via application.properties or CLI parameter @ComponentScan
 @EnableAutoConfiguration
 public class OrderApp {
 
 public static void main(String[] args) {
 SpringApplication.run(OrderApp.class, args);
 }
 }
48. Spring Boot > HTTP resource “/autoconfig” shows all properties > overwrite via application.properties or CLI parameter > configuration in git? -> Check spring-cloud configserver @ComponentScan
 @EnableAutoConfiguration
 public class OrderApp {
 
 public static void main(String[] args) {
 SpringApplication.run(OrderApp.class, args);
 }
 }
49. Http Client
50. Dropwizard public Product resolveProduct(String url) { Product product = client.resource(url) .accept(MediaType.APPLICATION_JSON).get(Product.class); return product; }
51. Spring Boot public Product resolveProduct(String url) { return restTemplate.getForEntity(url, Product.class);
 }
52. WS.url(apiUrl).get.map { response => response.json.as[List[Bestseller]] }.recover { case e => List() } Play
53. Service Discovery
54. Service Service Discovery Client Service Registry 2. discover service instances 3. call service instance Service Service 1. register service ("myself") & heartbeat
55. Spring Cloud @ComponentScan
 @EnableAutoConfiguration
 @EnableDiscoveryClient
 public class OrdersApp {
 
 public static void main(String[] args) {
 SpringApplication.run(OrdersApp.class, args);
 }
 }
56. Spring Cloud @ComponentScan
 @EnableAutoConfiguration
 @EnableDiscoveryClient
 public class OrdersApp {
 
 public static void main(String[] args) {
 SpringApplication.run(OrdersApp.class, args);
 }
 }
57. Spring Cloud @ComponentScan
 @EnableAutoConfiguration
 @EnableDiscoveryClient
 public class OrdersApp {
 
 public static void main(String[] args) {
 SpringApplication.run(OrdersApp.class, args);
 }
 }
58. Service Discovery with Sidecar Sidecar Client Service Registry Sidecar Service 2. register service ("myself") & heartbeat 4. discover service instances 5. call service instance 1. health check 3.
59. Resilience
60. Resilience > isolate Failure > apply graceful degradation > be responsive in case of failure
61. Request service http://en.wikipedia.org/wiki/Circuit_breaker closed
62. Request service http://en.wikipedia.org/wiki/Circuit_breaker closed Request service open
63. Request service http://en.wikipedia.org/wiki/Circuit_breaker closed Request service open Request service half- open
64. > Provides Command-oriented Integration of Services > Introduces Circuit Breaker, Bulkheads and Isolation > Decouples from Service-dependencies > Provides metrics-facility to protect from failures
65. Hystrix & Dropwizard public class CommandInDropwizard extends TenacityCommand<Product> { @Override protected Product run() throws Exception { Product product = client.resource(url) .accept(MediaType.APPLICATION_JSON).get(Product.class); return product; } protected Product getFallback() { return FALLBACK_PRODUCT } }
66. Hystrix & Dropwizard public class CommandInDropwizard extends TenacityCommand<Product> { @Override protected Product run() throws Exception { Product product = client.resource(url) .accept(MediaType.APPLICATION_JSON).get(Product.class); return product; } protected Product getFallback() { return FALLBACK_PRODUCT } }
67. Hystrix & Dropwizard public class CommandInDropwizard extends TenacityCommand<Product> { @Override protected Product run() throws Exception { Product product = client.resource(url) .accept(MediaType.APPLICATION_JSON).get(Product.class); return product; } protected Product getFallback() { return FALLBACK_PRODUCT } }
68. Hystrix & Dropwizard public class CommandInDropwizard extends TenacityCommand<Product> { @Override protected Product run() throws Exception { Product product = client.resource(url) .accept(MediaType.APPLICATION_JSON).get(Product.class); return product; } protected Product getFallback() { return FALLBACK_PRODUCT } }
69. ResolveProductCommand command = new ResolveProductCommand(client, url); Product product = command.execute(); Hystrix & Dropwizard
70. Spring Cloud Hystrix @HystrixCommand(fallbackMethod = “fallbackProduct") private Pair<String, ResponseEntity<Product>> resolveProduct(String productUri) {
 final RestTemplate restTemplate = new RestTemplate();
 return new Pair(productUri, restTemplate.getForEntity(productUri, Product.class));
 } private Pair<String, ResponseEntity<Product>> fallbackProduct(String productUri) {
 final Product product = new Product(productUri, null, BigDecimal.ZERO);
 final ResponseEntity<Product> response = new ResponseEntity<Product>(product, PARTIAL_CONTENT); return new Pair(productUri, response);
 }
71. Spring Cloud Hystrix @HystrixCommand(fallbackMethod = “fallbackProduct") private Pair<String, ResponseEntity<Product>> resolveProduct(String productUri) {
 final RestTemplate restTemplate = new RestTemplate();
 return new Pair(productUri, restTemplate.getForEntity(productUri, Product.class));
 } private Pair<String, ResponseEntity<Product>> fallbackProduct(String productUri) {
 final Product product = new Product(productUri, null, BigDecimal.ZERO);
 final ResponseEntity<Product> response = new ResponseEntity<Product>(product, PARTIAL_CONTENT); return new Pair(productUri, response);
 } auto-wrapped with command!
72. Spring Cloud Hystrix @HystrixCommand(fallbackMethod = “fallbackProduct") private Pair<String, ResponseEntity<Product>> resolveProduct(String productUri) {
 final RestTemplate restTemplate = new RestTemplate();
 return new Pair(productUri, restTemplate.getForEntity(productUri, Product.class));
 } private Pair<String, ResponseEntity<Product>> fallbackProduct(String productUri) {
 final Product product = new Product(productUri, null, BigDecimal.ZERO);
 final ResponseEntity<Product> response = new ResponseEntity<Product>(product, PARTIAL_CONTENT); return new Pair(productUri, response);
 }
73. Spring Cloud Hystrix @HystrixCommand(fallbackMethod = “fallbackProduct") private Pair<String, ResponseEntity<Product>> resolveProduct(String productUri) {
 final RestTemplate restTemplate = new RestTemplate();
 return new Pair(productUri, restTemplate.getForEntity(productUri, Product.class));
 } private Pair<String, ResponseEntity<Product>> fallbackProduct(String productUri) {
 final Product product = new Product(productUri, null, BigDecimal.ZERO);
 final ResponseEntity<Product> response = new ResponseEntity<Product>(product, PARTIAL_CONTENT); return new Pair(productUri, response);
 }
74. Spring Cloud Hystrix @HystrixCommand(fallbackMethod = “fallbackProduct") private Pair<String, ResponseEntity<Product>> resolveProduct(String productUri) {
 final RestTemplate restTemplate = new RestTemplate();
 return new Pair(productUri, restTemplate.getForEntity(productUri, Product.class));
 } private Pair<String, ResponseEntity<Product>> fallbackProduct(String productUri) {
 final Product product = new Product(productUri, null, BigDecimal.ZERO);
 final ResponseEntity<Product> response = new ResponseEntity<Product>(product, PARTIAL_CONTENT); return new Pair(productUri, response);
 } method reference!
75. Play - Circuit Breaker val apiUrl = "..." val breaker = CircuitBreaker(Akka.system().scheduler, maxFailures = 5, callTimeout = 2.seconds, resetTimeout = 1.minute) def getBestseller : Future[List[Bestseller]] = { breaker.withCircuitBreaker( WS.url(apiUrl).get.map { response => response.json.as[List[Bestseller]] }).recover { case e => List() } }
76. Play - Circuit Breaker val apiUrl = "..." val breaker = CircuitBreaker(Akka.system().scheduler, maxFailures = 5, callTimeout = 2.seconds, resetTimeout = 1.minute) def getBestseller : Future[List[Bestseller]] = { breaker.withCircuitBreaker( WS.url(apiUrl).get.map { response => response.json.as[List[Bestseller]] }).recover { case e => List() } }
77. Play - Circuit Breaker val apiUrl = "..." val breaker = CircuitBreaker(Akka.system().scheduler, maxFailures = 5, callTimeout = 2.seconds, resetTimeout = 1.minute) def getBestseller : Future[List[Bestseller]] = { breaker.withCircuitBreaker( WS.url(apiUrl).get.map { response => response.json.as[List[Bestseller]] }).recover { case e => List() } }
78. Play - Circuit Breaker val apiUrl = "..." val breaker = CircuitBreaker(Akka.system().scheduler, maxFailures = 5, callTimeout = 2.seconds, resetTimeout = 1.minute) def getBestseller : Future[List[Bestseller]] = { breaker.withCircuitBreaker( WS.url(apiUrl).get.map { response => response.json.as[List[Bestseller]] }).recover { case e => List() } }
79. Play - Circuit Breaker val apiUrl = "..." val breaker = CircuitBreaker(Akka.system().scheduler, maxFailures = 5, callTimeout = 2.seconds, resetTimeout = 1.minute) def getBestseller : Future[List[Bestseller]] = { breaker.withCircuitBreaker( WS.url(apiUrl).get.map { response => response.json.as[List[Bestseller]] }).recover { case e => List() } }
80. Deployment
81. Spring Boot - Packaging ./gradlew build ./gradlew distZip
82. Spring Boot - Packaging ./gradlew build ./gradlew distZip executable JAR
83. Spring Boot - Packaging ./gradlew build ./gradlew distZip ZIP + shell-script executable JAR
84. Play - Packaging sbt dist sbt debian:packageBin sbt rpm:packageBin
85. Metrics
86. Dropwizard > “Metrics” Integrated with Dropwizard > @Timed on Resources > HTTP Client is already instrumented > JVM Data
87. "org.apache.http.client.HttpClient.cart.get-requests": { "count": 11, "max": 0.062107, "mean": 0.013355909090909092, "min": 0.005750000000000001, "p50": 0.009454, "p75": 0.010427, "p95": 0.062107, "p98": 0.062107, "p99": 0.062107, "p999": 0.062107, "stddev": 0.016285873488729705, "m15_rate": 0, "m1_rate": 0, "m5_rate": 0, "mean_rate": 2.9714422786532126, "duration_units": "seconds", "rate_units": "calls/second" } "cart.resources.ShoppingCartResource.shoppingCart": { "count": 22, "max": 0.136162, "mean": 0.01208109090909091, "min": 0.00093, "p50": 0.008174500000000001, "p75": 0.011782250000000001, "p95": 0.11783499999999976, "p98": 0.136162, "p99": 0.136162, "p999": 0.136162, "stddev": 0.02813530239821426, "m15_rate": 1.8524577712890011, "m1_rate": 0.18057796798879996, "m5_rate": 1.315746847992022, "mean_rate": 0.133050618509084, "duration_units": "seconds", "rate_units": "calls/second" }
88. Dropwizard Metrics > Exposed over HTTP (as Json) > Exposed as jmx > Others available: stdout, csv, slf4j, ganglia, graphite
89. Spring Boot Metrics > Prepackaged Spring Boot starter module > enables HTTP resources for metrics > configurable via application.properties http://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/htmlsingle/#production-ready
90. { "counter.checkouts.withproducts.3": 4, ... } counterService.increment("checkouts.withproducts." + productUris.size());
 GET /metrics HTTP/1.1 Using a counter metric in your Java code… …will display it in the /metrics JSON Spring Boot Metrics
91. Summary
92. Modularize into independent, self-contained systems Summary
93. Modularize into independent, self-contained systems Separate micro and macro architectures Summary
94. Modularize into independent, self-contained systems Separate micro and macro architectures Strike a balance between control and decentralization Summary
95. Modularize into independent, self-contained systems Separate micro and macro architectures Strike a balance between control and decentralization MicroServices aren’t micro! Summary
96. Modularize into independent, self-contained systems Separate micro and macro architectures Strike a balance between control and decentralization MicroServices aren’t micro! frameworks can’t solve all your problems Summary
97. Martin Eigenbrodt | @eigenbrodtm martin.eigenbrodt@innoq.com Alexander Heusingfeld | @goldstift alexander.heusingfeld@innoq.com innoQ Deutschland GmbH Krischerstr. 100 40789 Monheim am Rhein Germany Phone: +49 2173 3366-0 innoQ Schweiz GmbH Gewerbestr. 11 CH-6330 Cham Switzerland Phone: +41 41 743 0116 www.innoq.com Ohlauer Straße 43 10999 Berlin Germany Phone: +49 2173 3366-0 Robert-Bosch-Straße 7 64293 Darmstadt Germany Phone: +49 2173 3366-0 Radlkoferstraße 2 D-81373 München Germany Telefon +49 (0) 89 741185-270 Thank you! Questions?
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