Vert.x - Reactive & Distributed [Devoxx version]
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During past years, the requirements for modern applications have increased from gigabytes of data to terabytes, from thousands of requests per second to millions, from seconds of response time to milliseconds, and this list can be continued. Until now, most of these problems have been solved using the Microservices architecture, but what's next? What next approach should we apply where Microservices fail? In this presentation, we will overview modern approaches to application development with Reactive and Distributed architecture and see how Vert.x help to implement such solutions.
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Vert.x - Reactive & Distributed [Devoxx version]
- 2. Orkhan Gasimov Digital Transformation Architect @ GlobalLogic 15 years of software engineering; training & mentorship; author of trainings about: Microservices; Spring Cloud; Akka; 2Speaker
- 5. Why Vert.x is Reactive? 5Agenda
- 6. How Vert.x is Distributed? 6Agenda
- 11. 11Toolkit
- 12. Reactor Pattern 12Vert.x Core Event Loop (single thread, non blocking)
- 13. Reactor Pattern 13Vert.x Core Event Loop (single thread, non blocking) Worker Worker Worker delegate long running jobs & IO callback
- 14. Multi-Reactor 14Vert.x Core Worker Worker Worker delegate long running jobs & IO callback Event Loops
- 15. Event Bus 15Vert.x Core Worker Worker Worker delegate long running jobs & IO callback Event Loops H H H H
- 16. Basic Architecture 16Vert.x Core Worker Worker Worker delegate long running jobs & IO callback Event Loops H Client Client Client H H H request response
- 17. 17Java Example Vertx vertx = Vertx.vertx(); Router router = Router.router(vertx);
- 18. 18Java Example Vertx vertx = Vertx.vertx(); Router router = Router.router(vertx); JsonObject mySQLClientConfig = new JsonObject().put("host", "localhost").put("database", "test"); SQLClient sqlClient = MySQLClient.createShared(vertx, mySQLClientConfig);
- 19. 19Java Example Vertx vertx = Vertx.vertx(); Router router = Router.router(vertx); JsonObject mySQLClientConfig = new JsonObject().put("host", "localhost").put("database", "test"); SQLClient sqlClient = MySQLClient.createShared(vertx, mySQLClientConfig); router.get("/hello/:name").produces("text/plain").handler(routingContext -> { String name = routingContext.pathParam("name");
- 20. 20Java Example Vertx vertx = Vertx.vertx(); Router router = Router.router(vertx); JsonObject mySQLClientConfig = new JsonObject().put("host", "localhost").put("database", "test"); SQLClient sqlClient = MySQLClient.createShared(vertx, mySQLClientConfig); router.get("/hello/:name").produces("text/plain").handler(routingContext -> { String name = routingContext.pathParam("name"); HttpServerResponse response = routingContext.response();
- 21. 21Java Example Vertx vertx = Vertx.vertx(); Router router = Router.router(vertx); JsonObject mySQLClientConfig = new JsonObject().put("host", "localhost").put("database", "test"); SQLClient sqlClient = MySQLClient.createShared(vertx, mySQLClientConfig); router.get("/hello/:name").produces("text/plain").handler(routingContext -> { String name = routingContext.pathParam("name"); HttpServerResponse response = routingContext.response(); sqlClient.updateWithParams("INSERT INTO names (name) VALUES (?)", new JsonArray().add(name),
- 22. 22Java Example Vertx vertx = Vertx.vertx(); Router router = Router.router(vertx); JsonObject mySQLClientConfig = new JsonObject().put("host", "localhost").put("database", "test"); SQLClient sqlClient = MySQLClient.createShared(vertx, mySQLClientConfig); router.get("/hello/:name").produces("text/plain").handler(routingContext -> { String name = routingContext.pathParam("name"); HttpServerResponse response = routingContext.response(); sqlClient.updateWithParams("INSERT INTO names (name) VALUES (?)", new JsonArray().add(name), event -> { if (event.succeeded()) { response.end("Hello " + name); }
- 23. 23Java Example Vertx vertx = Vertx.vertx(); Router router = Router.router(vertx); JsonObject mySQLClientConfig = new JsonObject().put("host", "localhost").put("database", "test"); SQLClient sqlClient = MySQLClient.createShared(vertx, mySQLClientConfig); router.get("/hello/:name").produces("text/plain").handler(routingContext -> { String name = routingContext.pathParam("name"); HttpServerResponse response = routingContext.response(); sqlClient.updateWithParams("INSERT INTO names (name) VALUES (?)", new JsonArray().add(name), event -> { if (event.succeeded()) { response.end("Hello " + name); } else { System.out.println("Could not INSERT to database with cause: " + event.cause()); response.setStatusCode(500); response.end(); } }); });
- 24. 24Java Example Vertx vertx = Vertx.vertx(); Router router = Router.router(vertx); JsonObject mySQLClientConfig = new JsonObject().put("host", "localhost").put("database", "test"); SQLClient sqlClient = MySQLClient.createShared(vertx, mySQLClientConfig); router.get("/hello/:name").produces("text/plain").handler(routingContext -> { String name = routingContext.pathParam("name"); HttpServerResponse response = routingContext.response(); sqlClient.updateWithParams("INSERT INTO names (name) VALUES (?)", new JsonArray().add(name), event -> { if (event.succeeded()) { response.end("Hello " + name); } else { System.out.println("Could not INSERT to database with cause: " + event.cause()); response.setStatusCode(500); response.end(); } }); }); HttpServer server = vertx.createHttpServer(); server.requestHandler(router::accept).listen(8080);
- 26. 26Verticles Verticle Handler Handler Handler Handler Handler Handler
- 27. 27Verticles Verticle Verticle Verticle Verticle Verticle Verticle Verticle Verticle Verticle
- 28. 28Event Loops Verticle Verticle Verticle Verticle Verticle Verticle Event Loop Event Loop Verticle Verticle Verticle
- 29. 29Event Bus Verticle EVENT BUS Verticle Verticle Verticle Verticle Verticle Event Loop Event Loop Verticle Verticle Verticle
- 30. 30Vert.x Runtime Verticle EVENT BUS Verticle Verticle Verticle Verticle Verticle Event Loop Event Loop Verticle Verticle Verticle
- 31. 31Vert.x Runtime Socket 1 … ... Socket N Verticle EVENT BUS Verticle Verticle Verticle Verticle Verticle Event Loop Event Loop Verticle Verticle Verticle
- 32. 32Vert.x Runtime Socket 1 … ... Socket N Verticle EVENT BUS Verticle Verticle Verticle Verticle Verticle CPU Core CPU Core Event Loop Event Loop Verticle Verticle Verticle
- 33. 33Verticle public class MyVerticle extends AbstractVerticle {
- 34. 34Verticle public class MyVerticle extends AbstractVerticle { private HttpServer server;
- 35. 35Verticle public class MyVerticle extends AbstractVerticle { private HttpServer server; @Override public void start(Future<Void> startFuture) {
- 36. 36Verticle public class MyVerticle extends AbstractVerticle { private HttpServer server; @Override public void start(Future<Void> startFuture) { server = vertx.createHttpServer().requestHandler(req -> { req.response() .putHeader("content-type", "text/plain") .end("Hello from Vert.x!"); });
- 37. 37Verticle public class MyVerticle extends AbstractVerticle { private HttpServer server; @Override public void start(Future<Void> startFuture) { server = vertx.createHttpServer().requestHandler(req -> { req.response() .putHeader("content-type", "text/plain") .end("Hello from Vert.x!"); }); server.listen(8080, res -> { if (res.succeeded()) { startFuture.complete(); } else { startFuture.fail(res.cause()); } }); }
- 38. 38Verticle public class MyVerticle extends AbstractVerticle { private HttpServer server; @Override public void start(Future<Void> startFuture) { server = vertx.createHttpServer().requestHandler(req -> { req.response() .putHeader("content-type", "text/plain") .end("Hello from Vert.x!"); }); server.listen(8080, res -> { if (res.succeeded()) { startFuture.complete(); } else { startFuture.fail(res.cause()); } }); } @Override public void stop(Future<Void> stopFuture) { //... } }
- 39. Standard Verticles Run on an event loop thread Verticles 39
- 40. Worker Verticles Run on the worker pool & never executed concurrently Verticles 40
- 41. Worker Verticles Run on the worker pool & never executed concurrently Verticles DeploymentOptions options = new DeploymentOptions().setWorker(true); vertx.deployVerticle("com.mycompany.MyOrderProcessorVerticle", options); 41
- 42. Multi-Threaded Worker Verticles Run on the worker pool & can be executed concurrently Verticles 42
- 50. Regions 50
- 60. Default: Hazelcast Alternatives: Infinispan Ignite Zookeper 3rd party: Atomix & etc. Cluster Manager Cluster Manager Vert.x Instance Vert.x Instance Vert.x Instance 60
- 61. $ vertx run myVerticle -ha Fail-Over Vert.x Instance 1 Vert.x Instance N ... Verticle 61
- 62. $ vertx run myVerticle -ha Fail-Over Vert.x Instance 1 Vert.x Instance N ... Verticle 62
- 63. $ vertx run myVerticle -ha Fail-Over Vert.x Instance 1 Vert.x Instance N ... Verticle 63
- 64. $ vertx run myVerticle -ha -hagroup group-1 Groups Group-1 Vert.x Instance 1 Vert.x Instance N Group-2 Vert.x Instance 1 Vert.x Instance N ... ... Verticle Verticle 64
- 65. $ vertx run myVerticle -ha -hagroup group-1 Groups Group 1 Vert.x Instance 1 Vert.x Instance N Group 2 Vert.x Instance 1 Vert.x Instance N ... ... Verticle Verticle 65
- 66. $ vertx run myVerticle -ha -hagroup group-1 Groups Group 1 Vert.x Instance 1 Vert.x Instance N Group 2 Vert.x Instance 1 Vert.x Instance N ... ... Verticle Verticle 66
- 67. $ vertx run myVerticle -ha -quorum 3 Quorum Vert.x Instance 2 Vert.x Instance 3 Verticle Verticle Vert.x Instance 1 Verticle 67
- 68. $ vertx run myVerticle -ha -quorum 3 Quorum Vert.x Instance 1 Vert.x Instance 2 Verticle Vert.x Instance 3 Verticle Verticle 68
- 69. $ vertx run myVerticle -ha -quorum 3 Quorum Vert.x Instance 1 Vert.x Instance 2 Vert.x Instance 3 69
- 70. $ vertx run myVerticle -ha -quorum 3 Quorum Vert.x Instance 2 Vert.x Instance 3 Vert.x Instance 1 70
- 71. $ vertx run myVerticle -ha -quorum 3 Quorum Vert.x Instance 2 Vert.x Instance 3 Verticle Verticle Vert.x Instance 1 Verticle 71
- 72. Round-robin by default Load Balancing Verticle Verticle Verticle Verticle VerticleVerticle 1 2 3 72
- 73. Shared Data
- 74. SharedData sd = vertx.sharedData(); Maps 74
- 75. SharedData sd = vertx.sharedData(); //Local LocalMap<String, String> localMap = sd.getLocalMap("myLocalMap"); localMap.put("foo", "bar"); String val = localMap.get("foo"); Maps 75
- 76. SharedData sd = vertx.sharedData(); //Local LocalMap<String, String> localMap = sd.getLocalMap("myLocalMap"); localMap.put("foo", "bar"); String val = localMap.get("foo"); //Async sd.<String, String>getAsyncMap("myAsyncMap", res -> { if (res.succeeded()) { AsyncMap<String, String> asyncMap = res.result(); } else { //fail } }); Maps 76
- 77. ... //Async get asyncMap.put("foo", "bar", resPut -> { if (resPut.succeeded()) { /*success*/ } else { /*fail*/ } }); Maps 77
- 78. ... //Async get asyncMap.put("foo", "bar", resPut -> { if (resPut.succeeded()) { /*success*/ } else { /*fail*/ } }); //Async put asyncMap.get("foo", resGet -> { if (resGet.succeeded()) { Object val = resGet.result(); } else { //fail } }); Maps 78
- 79. sd.getLock("mylock", res -> { if (res.succeeded()) { Lock lock = res.result(); // 5 seconds later we release the lock so someone else can get it vertx.setTimer(5000, tid -> lock.release()); } else { // Something went wrong } }); Locks 79
- 80. sd.getLock("mylock", res -> { if (res.succeeded()) { Lock lock = res.result(); // 5 seconds later we release the lock so someone else can get it vertx.setTimer(5000, tid -> lock.release()); } else { // Something went wrong } }); sd.getLockWithTimeout("mylock", 10000, res -> { if (res.succeeded()) { Lock lock = res.result(); } else { // Failed to get lock } }); Locks 80
- 81. sd.getCounter("mycounter", res -> { if (res.succeeded()) { Counter counter = res.result(); } else { // Something went wrong! } }); Counters 81
- 83. • File System • TCP Servers & Clients • HTTP Servers & Clients • UDP Servers & Clients • DNS Client • Launcher (fat jars) Other Core Features 83
- 85. Routing HTTP Request Validation OpenAPI 3 Support (with automatic requests validation) Vert.x Web 85
- 86. HttpServer server = vertx.createHttpServer(); Web Server 86
- 87. HttpServer server = vertx.createHttpServer(); Router router = Router.router(vertx); Web Server 87
- 88. HttpServer server = vertx.createHttpServer(); Router router = Router.router(vertx); router.post("/entity/:id").handler(routingContext -> { // This handler will be called for every request HttpServerResponse response = routingContext.response(); response.putHeader("content-type", "text/plain"); // Write to the response and end it response.end("Hello World from Vert.x-Web!"); }); Web Server 88
- 89. HttpServer server = vertx.createHttpServer(); Router router = Router.router(vertx); router.post("/entity/:id").handler(routingContext -> { // This handler will be called for every request HttpServerResponse response = routingContext.response(); response.putHeader("content-type", "text/plain"); // Write to the response and end it response.end("Hello World from Vert.x-Web!"); }); server.requestHandler(router::accept).listen(8080); Web Server 89
- 90. WebClient client = WebClient.create(vertx); Web Client 90
- 91. WebClient client = WebClient.create(vertx); client .get(8080, "myserver.mycompany.com", "/some-uri") Web Client 91
- 92. WebClient client = WebClient.create(vertx); client .get(8080, "myserver.mycompany.com", "/some-uri") .timeout(5000) Web Client 92
- 93. WebClient client = WebClient.create(vertx); client .get(8080, "myserver.mycompany.com", "/some-uri") .timeout(5000) .addQueryParam("param", "param_value") Web Client 93
- 94. WebClient client = WebClient.create(vertx); client .get(8080, "myserver.mycompany.com", "/some-uri") .timeout(5000) .addQueryParam("param", "param_value") .send(ar -> { if (ar.succeeded()) { // Obtain response HttpResponse<Buffer> response = ar.result(); System.out.println("Received response with status code" + response.statusCode()); Web Client 94
- 95. WebClient client = WebClient.create(vertx); client .get(8080, "myserver.mycompany.com", "/some-uri") .timeout(5000) .addQueryParam("param", "param_value") .send(ar -> { if (ar.succeeded()) { // Obtain response HttpResponse<Buffer> response = ar.result(); System.out.println("Received response with status code" + response.statusCode()); } else { System.out.println("Something went wrong " + ar.cause().getMessage()); } }); Web Client 95
- 96. client .post(8080, "myserver.mycompany.com", "/some-uri") .sendJsonObject(new JsonObject() .put("firstName", "Dale") .put("lastName", "Cooper"), ar -> { if (ar.succeeded()) { // Ok } }); Web Client 96
- 97. client .post(8080, "myserver.mycompany.com", "/some-uri") .sendJsonObject(new JsonObject() .put("firstName", "Dale") .put("lastName", "Cooper"), ar -> { if (ar.succeeded()) { // Ok } }); client .post(8080, "myserver.mycompany.com", "/some-uri") .sendJson(new User("Dale", "Cooper"), ar -> { if (ar.succeeded()) { // Ok } }); Web Client 97
- 99. • OAuth 2 • JWT • Apache Shiro • JDBC • MongoDB • .htdigest Auth Prodivers 99
- 100. • OAuth 2 • JWT • Apache Shiro • JDBC • MongoDB • .htdigest • ... your implementation Auth Prodivers 100
- 101. router.route("/private/somepath").handler(routingContext -> { User user = routingContext.user(); Auth 101
- 102. router.route("/private/somepath").handler(routingContext -> { User user = routingContext.user(); user.isAuthorised("permission_or_authority", event -> { //async handler }); Auth 102
- 103. router.route("/private/somepath").handler(routingContext -> { User user = routingContext.user(); user.isAuthorised("permission_or_authority", event -> { //async handler }); user.isAuthorised("role:role_name", event -> { //async handler }); }); Auth 103
- 104. Microservices
- 114. • Publish & Discover • HTTP Endpoints Service Discovery Sales Accounting WarehouseUsers Stores HTTP DB SQL 114
- 115. • Publish & Discover • HTTP Endpoints • Data Sources Service Discovery Sales Accounting WarehouseUsers Stores HTTP DB SQL 115
- 116. • Publish & Discover • HTTP Endpoints • Data Sources • Event Bus Services Service Discovery Sales Accounting WarehouseUsers Stores HTTP DB SQL 116
- 117. • Publish & Discover • HTTP Endpoints • Data Sources • Event Bus Services • Anything you can imagine Service Discovery Sales Accounting WarehouseUsers Stores HTTP DB SQL 117
- 119. Circuit Breaker 119 Closed Open Success Too many fails
- 120. Circuit Breaker 120 Closed Open Success Too many fails Fast Fail
- 121. Circuit Breaker 121 Closed Open Half-Open Success Too many fails Fast Fail Try one request
- 122. Circuit Breaker 122 Closed Open Half-Open Success Too many fails Fast Fail Try one request Fail
- 123. Circuit Breaker 123 Closed Open Half-Open Success Too many fails Fast Fail Try one request Fail Success
- 124. CircuitBreaker breaker = CircuitBreaker.create("my-circuit-breaker", vertx, Circuit Breaker 124
- 125. CircuitBreaker breaker = CircuitBreaker.create("my-circuit-breaker", vertx, new CircuitBreakerOptions() .setMaxFailures(5) // number of failure before opening the circuit .setTimeout(2000) // consider a failure if the operation does not succeed in time .setFallbackOnFailure(true) // do we call the fallback on failure .setResetTimeout(10000) // time spent in open state before attempting to re-try ); Circuit Breaker 125
- 126. CircuitBreaker breaker = CircuitBreaker.create("my-circuit-breaker", vertx, new CircuitBreakerOptions() .setMaxFailures(5) // number of failure before opening the circuit .setTimeout(2000) // consider a failure if the operation does not succeed in time .setFallbackOnFailure(true) // do we call the fallback on failure .setResetTimeout(10000) // time spent in open state before attempting to re-try ); breaker.execute(future -> { // future.complete(“success") // future.fail("cause") }).setHandler(ar -> { // Get the operation result. }); Circuit Breaker 126
- 127. CircuitBreaker breaker = CircuitBreaker.create("my-circuit-breaker", vertx, new CircuitBreakerOptions() .setMaxFailures(5) // number of failure before opening the circuit .setTimeout(2000) // consider a failure if the operation does not succeed in time .setFallbackOnFailure(true) // do we call the fallback on failure .setResetTimeout(10000) // time spent in open state before attempting to re-try ); breaker.executeWithFallback(future -> { // future.complete(“success") // future.fail("cause") }, th -> { // Fallback return "Hello"; }).setHandler(ar -> { // Get the operation result. }); Circuit Breaker 127
- 128. • Formats • Properties • JSON • YAML • etc. Config 128
- 129. • Formats • Properties • JSON • YAML • etc. Config • Sources • File / Directory • Environment Variables • System Properties • HTTP • Event Bus • Git • Kubernetes ConfigMap • Redis • Zookeeper / Consul • Vault • Spring Config Server • etc. 129
- 130. Data Access SQL & NoSQL
- 131. Out of the box • SQL • JDBC • MySQL • PostgreSQL Data Access 131
- 132. Out of the box • SQL • JDBC • MySQL • PostgreSQL • NoSQL • MongoDB • Redis Data Access 132
- 133. Out of the box • SQL • JDBC • MySQL • PostgreSQL • NoSQL • MongoDB • Redis 3rd party • Anything... Data Access 133
- 134. Integration
- 135. 135Integration • Event Bus Bridges • TCP Bridge
- 136. 136Integration • Event Bus Bridges • TCP Bridge • Camel Bridge
- 137. 137Integration • Event Bus Bridges • TCP Bridge • Camel Bridge • AMQP Bridge
- 138. 138Integration • Event Bus Bridges • TCP Bridge • Camel Bridge • AMQP Bridge • Messaging & Streaming • RabbitMQ Client • Kafka Client
- 139. 139Integration • Event Bus Bridges • TCP Bridge • Camel Bridge • AMQP Bridge • Messaging & Streaming • RabbitMQ Client • Kafka Client • STOMP Server & Client
- 140. 140Integration • Event Bus Bridges • TCP Bridge • Camel Bridge • AMQP Bridge • Messaging & Streaming • RabbitMQ Client • Kafka Client • STOMP Server & Client • IoT • MQTT
- 141. 141Integration • Event Bus Bridges • TCP Bridge • Camel Bridge • AMQP Bridge • Messaging & Streaming • RabbitMQ Client • Kafka Client • STOMP Server & Client • IoT • MQTT • Java EE • JCA Resource Adaptor
- 142. 142Integration • Event Bus Bridges • TCP Bridge • Camel Bridge • AMQP Bridge • Messaging & Streaming • RabbitMQ Client • Kafka Client • STOMP Server & Client • IoT • MQTT • Java EE • JCA Resource Adaptor • Misc • Mail Client • Consul Client
- 143. Metrics
- 145. Metrics 145 Micrometer SignalFx StatsD New Relix Influx/Telegraf JMXPrometheus Netflix Atlas CloudWatch Datadog Graphite Ganglia Wavefront
- 147. Reactive
- 148. • Vert.x supports • RxJava 1 Reactive Programming 148
- 149. • Vert.x supports • RxJava 1 • RxJava 2 Reactive Programming 149
- 150. • Vert.x supports • RxJava 1 • RxJava 2 • Reactive Streams (publishers & subscribers) Reactive Programming 150
- 151. fileSystem .rxReadFile("cities.txt").toFlowable() .flatMap(buffer -> Flowable.fromArray(buffer.toString().split("r?n"))) .flatMap(city -> searchByCityName(httpClient, city)) .flatMap(HttpClientResponse::toFlowable) .map(extractingWoeid()) .flatMap(cityId -> getDataByPlaceId(httpClient, cityId)) .flatMap(toBufferFlowable()) .map(Buffer::toJsonObject) .map(toCityAndDayLength()) .subscribe(System.out::println, Throwable::printStackTrace); Reactive Programming 151
- 152. Observable<Double> observable = vertx.eventBus(). <Double>consumer("heat-sensor"). bodyStream(). toObservable(); observable. buffer(1, TimeUnit.SECONDS). map(samples -> samples. stream(). collect(Collectors.averagingDouble(d -> d))). subscribe(heat -> { vertx.eventBus().send("news-feed", "Current heat is " + heat); }); Reactive Programming 152
- 153. Reactive Manifesto 153 Responsive Message Driven Elastic Resilient
- 154. Reactive & Distributed Vert.x Summary
- 155. Reactive & Distributed Event Bus 155
- 156. Reactive & Distributed Event Bus 156
- 157. Reactive & Distributed Event Bus Server 1 Server 2 Server 3 Server N... 157
- 158. Reactive & Distributed Event Bus Handler Handler Handler Handler Handler Handler Server 1 Server 2 Server 3 Server N... 158
- 159. Reactive & Distributed Module ModuleModule Event Bus Handler Handler Handler Handler Handler Handler Server 1 Server 2 Server 3 Server N... 159
- 160. Reactive & Distributed 160 Bridged Apps Data Access Metrics External Apps IoT Devices etc. Module ModuleModule Event Bus Handler Handler Handler Handler Handler Handler Server 1 Server 2 Server 3 Server N...
- 161. Reactive & Distributed 161 Bridged Apps Data Access Metrics External Apps IoT Devices etc. Module ModuleModule Event Bus Handler Handler Handler Handler Handler Handler Server 1 Server 2 Server 3 Server N...
- 162. • Java • JavaScript • Groovy • Ruby • Ceylon • Scala • Kotlin Polyglot 162 Bridged Apps Data Access Metrics External Apps IoT Devices etc. Module ModuleModule Event Bus Handler Handler Handler Handler Handler Handler Server 1 Server 2 Server 3 Server N...
- 163. • JavaScript • Event bus integration over SockJS for browser-based & node.js apps. Polyglot 163 Bridged Apps Data Access Metrics External Apps IoT Devices etc. Module ModuleModule Event Bus Handler Handler Handler Handler Handler Handler Server 1 Server 2 Server 3 Server N...
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