test: HandoverIT-POC - splitted up code into smaller classes -- MOVE

diff --git a/src/test/java/de/juplo/kafka/chat/backend/StatusTO.java b/src/test/java/de/juplo/kafka/chat/backend/StatusTO.java
new file mode 100644 (file)
index 0000000..f384f7e
--- /dev/null
+++ b/src/test/java/de/juplo/kafka/chat/backend/StatusTO.java
@@ -0,0 +1,274 @@
+package de.juplo.kafka.chat.backend;
+
+import de.juplo.kafka.chat.backend.api.ChatRoomInfoTo;
+import de.juplo.kafka.chat.backend.api.MessageTo;
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.Setter;
+import lombok.ToString;
+import lombok.extern.slf4j.Slf4j;
+import org.awaitility.Awaitility;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.springframework.core.ParameterizedTypeReference;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.codec.ServerSentEvent;
+import org.springframework.web.reactive.function.client.WebClient;
+import org.testcontainers.containers.BindMode;
+import org.testcontainers.containers.GenericContainer;
+import org.testcontainers.containers.Network;
+import org.testcontainers.containers.output.Slf4jLogConsumer;
+import org.testcontainers.containers.wait.strategy.Wait;
+import org.testcontainers.images.ImagePullPolicy;
+import org.testcontainers.junit.jupiter.Testcontainers;
+import org.testcontainers.utility.DockerImageName;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+import reactor.util.retry.Retry;
+
+import java.io.IOException;
+import java.time.Duration;
+import java.util.stream.IntStream;
+
+
+@Testcontainers
+@Slf4j
+public abstract class AbstractHandoverIT
+{
+  static final ImagePullPolicy NEVER_PULL = imageName -> false;
+  static final ParameterizedTypeReference<ServerSentEvent<String>> SSE_TYPE = new ParameterizedTypeReference<>() {};
+
+
+  @Test
+  void test() throws InterruptedException
+  {
+    ChatRoomInfoTo chatRoom = createChatRoom("bar").block();
+    User user = new User("nerd");
+    IntStream
+        .rangeClosed(1,100)
+        .mapToObj(i ->sendMessage(chatRoom, user, "Message #" + i))
+        .map(result -> result
+            .map(MessageTo::toString)
+            .retryWhen(Retry.fixedDelay(10, Duration.ofSeconds(1)))
+            .block())
+        .forEach(result -> log.info("{}", result));
+
+    receiveMessages(chatRoom)
+        .take(100)
+        .doOnNext(message -> log.info("message: {}", message))
+        .then()
+        .block();
+  }
+
+  Mono<ChatRoomInfoTo> createChatRoom(String name)
+  {
+    return webClient
+        .post()
+        .uri("/create")
+        .contentType(MediaType.TEXT_PLAIN)
+        .bodyValue(name)
+        .accept(MediaType.APPLICATION_JSON)
+        .exchangeToMono(response ->
+        {
+          if (response.statusCode().equals(HttpStatus.OK))
+          {
+            return response.bodyToMono(ChatRoomInfoTo.class);
+          }
+          else
+          {
+            return response.createError();
+          }
+        });
+  }
+
+  Mono<MessageTo> sendMessage(
+      ChatRoomInfoTo chatRoom,
+      User user,
+      String message)
+  {
+    return webClient
+        .put()
+        .uri(
+            "/{chatRoomId}/{username}/{serial}",
+            chatRoom.getId(),
+            user.getName(),
+            user.nextSerial())
+        .contentType(MediaType.TEXT_PLAIN)
+        .accept(MediaType.APPLICATION_JSON)
+        .bodyValue(message)
+        .exchangeToMono(response ->
+        {
+          if (response.statusCode().equals(HttpStatus.OK))
+          {
+            return response.bodyToMono(MessageTo.class);
+          }
+          else
+          {
+            return response.createError();
+          }
+        });
+  }
+
+  Flux<ServerSentEvent<String>> receiveMessages(ChatRoomInfoTo chatRoom)
+  {
+    return webClient
+        .get()
+        .uri(
+            "/{chatRoomId}/listen",
+            chatRoom.getId())
+        .accept(MediaType.TEXT_EVENT_STREAM)
+        .retrieve()
+        .bodyToFlux(SSE_TYPE);
+  }
+
+
+  WebClient webClient;
+
+
+  abstract void setUpExtra() throws IOException, InterruptedException;
+
+  @BeforeEach
+  void setUp() throws Exception
+  {
+    setUpExtra();
+    haproxy.start();
+    backend1.start();
+    // backend2.start();
+    // backend3.start();
+
+    Integer port = haproxy.getMappedPort(8400);
+    webClient = WebClient.create("http://localhost:" + port);
+
+    Awaitility
+        .await()
+        .atMost(Duration.ofMinutes(10))
+        .until(() -> WebClient
+            .create("http://localhost:" + backend1.getMappedPort(8080))
+            .get()
+            .uri("/actuator/health")
+            .exchangeToMono(response ->
+            {
+              if (response.statusCode().equals(HttpStatus.OK))
+              {
+                return response
+                    .bodyToMono(StatusTo.class)
+                    .map(StatusTo::getStatus)
+                    .map(status -> status.equalsIgnoreCase("UP"));
+              }
+              else
+              {
+                return Mono.just(false);
+              }
+            })
+            .block());
+
+    haproxy
+        .getDockerClient()
+        .killContainerCmd(haproxy.getContainerId())
+        .withSignal("HUP")
+        .exec();
+
+
+    Awaitility
+        .await()
+        .atMost(Duration.ofMinutes(10))
+        .until(() -> webClient
+            .get()
+            .uri("/actuator/health")
+            .exchangeToMono(response ->
+            {
+              if (response.statusCode().equals(HttpStatus.OK))
+              {
+                return response
+                    .bodyToMono(StatusTo.class)
+                    .map(StatusTo::getStatus)
+                    .map(status -> status.equalsIgnoreCase("UP"));
+              }
+              else
+              {
+                return Mono.just(false);
+              }
+            })
+            .block());
+  }
+
+  Network network = Network.newNetwork();
+
+  GenericContainer haproxy =
+      new GenericContainer(DockerImageName.parse("haproxytech/haproxy-debian:2.8"))
+          .withNetwork(network)
+          .withNetworkAliases("haproxy")
+          .withClasspathResourceMapping(
+              "haproxy.cfg",
+              "/usr/local/etc/haproxy/haproxy.cfg",
+              BindMode.READ_ONLY)
+          .withClasspathResourceMapping(
+              "sharding.map",
+              "/usr/local/etc/haproxy/sharding.map",
+              BindMode.READ_WRITE)
+          .withExposedPorts(8400, 8401, 8404)
+          .withLogConsumer(new Slf4jLogConsumer(log, true).withPrefix("HAPROXY"));
+
+  abstract String[] getCommandBackend1();
+  GenericContainer backend1 =
+      new GenericContainer(DockerImageName.parse("juplo/chat-backend:0.0.1-SNAPSHOT"))
+          .withImagePullPolicy(NEVER_PULL)
+          .withNetwork(network)
+          .withNetworkAliases("backend-1")
+          .withCommand(getCommandBackend1())
+          .withExposedPorts(8080)
+          .waitingFor(Wait.forLogMessage(".*Started\\ ChatBackendApplication.*\\n", 1))
+          .withLogConsumer(new Slf4jLogConsumer(log, true).withPrefix("BACKEND-1"));
+
+  abstract String[] getCommandBackend2();
+  GenericContainer backend2 =
+      new GenericContainer(DockerImageName.parse("juplo/chat-backend:0.0.1-SNAPSHOT"))
+          .withImagePullPolicy(NEVER_PULL)
+          .withNetwork(network)
+          .withNetworkAliases("backend-2")
+          .withCommand(getCommandBackend2())
+          .withExposedPorts(8080)
+          .waitingFor(Wait.forLogMessage(".*Started\\ ChatBackendApplication.*\\n", 1))
+          .withLogConsumer(new Slf4jLogConsumer(log, true).withPrefix("BACKEND-2"));
+
+  abstract String[] getCommandBackend3();
+  GenericContainer backend3 =
+      new GenericContainer(DockerImageName.parse("juplo/chat-backend:0.0.1-SNAPSHOT"))
+          .withImagePullPolicy(NEVER_PULL)
+          .withNetwork(network)
+          .withNetworkAliases("backend-3")
+          .withCommand(getCommandBackend3())
+          .withExposedPorts(8080)
+          .waitingFor(Wait.forLogMessage(".*Started\\ ChatBackendApplication.*\\n", 1))
+          .withLogConsumer(new Slf4jLogConsumer(log, true).withPrefix("BACKEND-3"));
+
+
+  @EqualsAndHashCode
+  @ToString
+  class User
+  {
+    @Getter
+    private final String name;
+    private int serial = 0;
+
+
+    User (String name)
+    {
+      this.name = name;
+    }
+
+
+    int nextSerial()
+    {
+      return ++serial;
+    }
+  }
+
+  @Getter
+  @Setter
+  static class StatusTo
+  {
+    String status;
+  }
+}

diff --git a/src/test/java/de/juplo/kafka/chat/backend/TestClient.java b/src/test/java/de/juplo/kafka/chat/backend/TestClient.java
new file mode 100644 (file)
index 0000000..f384f7e
--- /dev/null
+++ b/src/test/java/de/juplo/kafka/chat/backend/TestClient.java
@@ -0,0 +1,274 @@
+package de.juplo.kafka.chat.backend;
+
+import de.juplo.kafka.chat.backend.api.ChatRoomInfoTo;
+import de.juplo.kafka.chat.backend.api.MessageTo;
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.Setter;
+import lombok.ToString;
+import lombok.extern.slf4j.Slf4j;
+import org.awaitility.Awaitility;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.springframework.core.ParameterizedTypeReference;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.codec.ServerSentEvent;
+import org.springframework.web.reactive.function.client.WebClient;
+import org.testcontainers.containers.BindMode;
+import org.testcontainers.containers.GenericContainer;
+import org.testcontainers.containers.Network;
+import org.testcontainers.containers.output.Slf4jLogConsumer;
+import org.testcontainers.containers.wait.strategy.Wait;
+import org.testcontainers.images.ImagePullPolicy;
+import org.testcontainers.junit.jupiter.Testcontainers;
+import org.testcontainers.utility.DockerImageName;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+import reactor.util.retry.Retry;
+
+import java.io.IOException;
+import java.time.Duration;
+import java.util.stream.IntStream;
+
+
+@Testcontainers
+@Slf4j
+public abstract class AbstractHandoverIT
+{
+  static final ImagePullPolicy NEVER_PULL = imageName -> false;
+  static final ParameterizedTypeReference<ServerSentEvent<String>> SSE_TYPE = new ParameterizedTypeReference<>() {};
+
+
+  @Test
+  void test() throws InterruptedException
+  {
+    ChatRoomInfoTo chatRoom = createChatRoom("bar").block();
+    User user = new User("nerd");
+    IntStream
+        .rangeClosed(1,100)
+        .mapToObj(i ->sendMessage(chatRoom, user, "Message #" + i))
+        .map(result -> result
+            .map(MessageTo::toString)
+            .retryWhen(Retry.fixedDelay(10, Duration.ofSeconds(1)))
+            .block())
+        .forEach(result -> log.info("{}", result));
+
+    receiveMessages(chatRoom)
+        .take(100)
+        .doOnNext(message -> log.info("message: {}", message))
+        .then()
+        .block();
+  }
+
+  Mono<ChatRoomInfoTo> createChatRoom(String name)
+  {
+    return webClient
+        .post()
+        .uri("/create")
+        .contentType(MediaType.TEXT_PLAIN)
+        .bodyValue(name)
+        .accept(MediaType.APPLICATION_JSON)
+        .exchangeToMono(response ->
+        {
+          if (response.statusCode().equals(HttpStatus.OK))
+          {
+            return response.bodyToMono(ChatRoomInfoTo.class);
+          }
+          else
+          {
+            return response.createError();
+          }
+        });
+  }
+
+  Mono<MessageTo> sendMessage(
+      ChatRoomInfoTo chatRoom,
+      User user,
+      String message)
+  {
+    return webClient
+        .put()
+        .uri(
+            "/{chatRoomId}/{username}/{serial}",
+            chatRoom.getId(),
+            user.getName(),
+            user.nextSerial())
+        .contentType(MediaType.TEXT_PLAIN)
+        .accept(MediaType.APPLICATION_JSON)
+        .bodyValue(message)
+        .exchangeToMono(response ->
+        {
+          if (response.statusCode().equals(HttpStatus.OK))
+          {
+            return response.bodyToMono(MessageTo.class);
+          }
+          else
+          {
+            return response.createError();
+          }
+        });
+  }
+
+  Flux<ServerSentEvent<String>> receiveMessages(ChatRoomInfoTo chatRoom)
+  {
+    return webClient
+        .get()
+        .uri(
+            "/{chatRoomId}/listen",
+            chatRoom.getId())
+        .accept(MediaType.TEXT_EVENT_STREAM)
+        .retrieve()
+        .bodyToFlux(SSE_TYPE);
+  }
+
+
+  WebClient webClient;
+
+
+  abstract void setUpExtra() throws IOException, InterruptedException;
+
+  @BeforeEach
+  void setUp() throws Exception
+  {
+    setUpExtra();
+    haproxy.start();
+    backend1.start();
+    // backend2.start();
+    // backend3.start();
+
+    Integer port = haproxy.getMappedPort(8400);
+    webClient = WebClient.create("http://localhost:" + port);
+
+    Awaitility
+        .await()
+        .atMost(Duration.ofMinutes(10))
+        .until(() -> WebClient
+            .create("http://localhost:" + backend1.getMappedPort(8080))
+            .get()
+            .uri("/actuator/health")
+            .exchangeToMono(response ->
+            {
+              if (response.statusCode().equals(HttpStatus.OK))
+              {
+                return response
+                    .bodyToMono(StatusTo.class)
+                    .map(StatusTo::getStatus)
+                    .map(status -> status.equalsIgnoreCase("UP"));
+              }
+              else
+              {
+                return Mono.just(false);
+              }
+            })
+            .block());
+
+    haproxy
+        .getDockerClient()
+        .killContainerCmd(haproxy.getContainerId())
+        .withSignal("HUP")
+        .exec();
+
+
+    Awaitility
+        .await()
+        .atMost(Duration.ofMinutes(10))
+        .until(() -> webClient
+            .get()
+            .uri("/actuator/health")
+            .exchangeToMono(response ->
+            {
+              if (response.statusCode().equals(HttpStatus.OK))
+              {
+                return response
+                    .bodyToMono(StatusTo.class)
+                    .map(StatusTo::getStatus)
+                    .map(status -> status.equalsIgnoreCase("UP"));
+              }
+              else
+              {
+                return Mono.just(false);
+              }
+            })
+            .block());
+  }
+
+  Network network = Network.newNetwork();
+
+  GenericContainer haproxy =
+      new GenericContainer(DockerImageName.parse("haproxytech/haproxy-debian:2.8"))
+          .withNetwork(network)
+          .withNetworkAliases("haproxy")
+          .withClasspathResourceMapping(
+              "haproxy.cfg",
+              "/usr/local/etc/haproxy/haproxy.cfg",
+              BindMode.READ_ONLY)
+          .withClasspathResourceMapping(
+              "sharding.map",
+              "/usr/local/etc/haproxy/sharding.map",
+              BindMode.READ_WRITE)
+          .withExposedPorts(8400, 8401, 8404)
+          .withLogConsumer(new Slf4jLogConsumer(log, true).withPrefix("HAPROXY"));
+
+  abstract String[] getCommandBackend1();
+  GenericContainer backend1 =
+      new GenericContainer(DockerImageName.parse("juplo/chat-backend:0.0.1-SNAPSHOT"))
+          .withImagePullPolicy(NEVER_PULL)
+          .withNetwork(network)
+          .withNetworkAliases("backend-1")
+          .withCommand(getCommandBackend1())
+          .withExposedPorts(8080)
+          .waitingFor(Wait.forLogMessage(".*Started\\ ChatBackendApplication.*\\n", 1))
+          .withLogConsumer(new Slf4jLogConsumer(log, true).withPrefix("BACKEND-1"));
+
+  abstract String[] getCommandBackend2();
+  GenericContainer backend2 =
+      new GenericContainer(DockerImageName.parse("juplo/chat-backend:0.0.1-SNAPSHOT"))
+          .withImagePullPolicy(NEVER_PULL)
+          .withNetwork(network)
+          .withNetworkAliases("backend-2")
+          .withCommand(getCommandBackend2())
+          .withExposedPorts(8080)
+          .waitingFor(Wait.forLogMessage(".*Started\\ ChatBackendApplication.*\\n", 1))
+          .withLogConsumer(new Slf4jLogConsumer(log, true).withPrefix("BACKEND-2"));
+
+  abstract String[] getCommandBackend3();
+  GenericContainer backend3 =
+      new GenericContainer(DockerImageName.parse("juplo/chat-backend:0.0.1-SNAPSHOT"))
+          .withImagePullPolicy(NEVER_PULL)
+          .withNetwork(network)
+          .withNetworkAliases("backend-3")
+          .withCommand(getCommandBackend3())
+          .withExposedPorts(8080)
+          .waitingFor(Wait.forLogMessage(".*Started\\ ChatBackendApplication.*\\n", 1))
+          .withLogConsumer(new Slf4jLogConsumer(log, true).withPrefix("BACKEND-3"));
+
+
+  @EqualsAndHashCode
+  @ToString
+  class User
+  {
+    @Getter
+    private final String name;
+    private int serial = 0;
+
+
+    User (String name)
+    {
+      this.name = name;
+    }
+
+
+    int nextSerial()
+    {
+      return ++serial;
+    }
+  }
+
+  @Getter
+  @Setter
+  static class StatusTo
+  {
+    String status;
+  }
+}

diff --git a/src/test/java/de/juplo/kafka/chat/backend/User.java b/src/test/java/de/juplo/kafka/chat/backend/User.java
new file mode 100644 (file)
index 0000000..f384f7e
--- /dev/null
+++ b/src/test/java/de/juplo/kafka/chat/backend/User.java
@@ -0,0 +1,274 @@
+package de.juplo.kafka.chat.backend;
+
+import de.juplo.kafka.chat.backend.api.ChatRoomInfoTo;
+import de.juplo.kafka.chat.backend.api.MessageTo;
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.Setter;
+import lombok.ToString;
+import lombok.extern.slf4j.Slf4j;
+import org.awaitility.Awaitility;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.springframework.core.ParameterizedTypeReference;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.codec.ServerSentEvent;
+import org.springframework.web.reactive.function.client.WebClient;
+import org.testcontainers.containers.BindMode;
+import org.testcontainers.containers.GenericContainer;
+import org.testcontainers.containers.Network;
+import org.testcontainers.containers.output.Slf4jLogConsumer;
+import org.testcontainers.containers.wait.strategy.Wait;
+import org.testcontainers.images.ImagePullPolicy;
+import org.testcontainers.junit.jupiter.Testcontainers;
+import org.testcontainers.utility.DockerImageName;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+import reactor.util.retry.Retry;
+
+import java.io.IOException;
+import java.time.Duration;
+import java.util.stream.IntStream;
+
+
+@Testcontainers
+@Slf4j
+public abstract class AbstractHandoverIT
+{
+  static final ImagePullPolicy NEVER_PULL = imageName -> false;
+  static final ParameterizedTypeReference<ServerSentEvent<String>> SSE_TYPE = new ParameterizedTypeReference<>() {};
+
+
+  @Test
+  void test() throws InterruptedException
+  {
+    ChatRoomInfoTo chatRoom = createChatRoom("bar").block();
+    User user = new User("nerd");
+    IntStream
+        .rangeClosed(1,100)
+        .mapToObj(i ->sendMessage(chatRoom, user, "Message #" + i))
+        .map(result -> result
+            .map(MessageTo::toString)
+            .retryWhen(Retry.fixedDelay(10, Duration.ofSeconds(1)))
+            .block())
+        .forEach(result -> log.info("{}", result));
+
+    receiveMessages(chatRoom)
+        .take(100)
+        .doOnNext(message -> log.info("message: {}", message))
+        .then()
+        .block();
+  }
+
+  Mono<ChatRoomInfoTo> createChatRoom(String name)
+  {
+    return webClient
+        .post()
+        .uri("/create")
+        .contentType(MediaType.TEXT_PLAIN)
+        .bodyValue(name)
+        .accept(MediaType.APPLICATION_JSON)
+        .exchangeToMono(response ->
+        {
+          if (response.statusCode().equals(HttpStatus.OK))
+          {
+            return response.bodyToMono(ChatRoomInfoTo.class);
+          }
+          else
+          {
+            return response.createError();
+          }
+        });
+  }
+
+  Mono<MessageTo> sendMessage(
+      ChatRoomInfoTo chatRoom,
+      User user,
+      String message)
+  {
+    return webClient
+        .put()
+        .uri(
+            "/{chatRoomId}/{username}/{serial}",
+            chatRoom.getId(),
+            user.getName(),
+            user.nextSerial())
+        .contentType(MediaType.TEXT_PLAIN)
+        .accept(MediaType.APPLICATION_JSON)
+        .bodyValue(message)
+        .exchangeToMono(response ->
+        {
+          if (response.statusCode().equals(HttpStatus.OK))
+          {
+            return response.bodyToMono(MessageTo.class);
+          }
+          else
+          {
+            return response.createError();
+          }
+        });
+  }
+
+  Flux<ServerSentEvent<String>> receiveMessages(ChatRoomInfoTo chatRoom)
+  {
+    return webClient
+        .get()
+        .uri(
+            "/{chatRoomId}/listen",
+            chatRoom.getId())
+        .accept(MediaType.TEXT_EVENT_STREAM)
+        .retrieve()
+        .bodyToFlux(SSE_TYPE);
+  }
+
+
+  WebClient webClient;
+
+
+  abstract void setUpExtra() throws IOException, InterruptedException;
+
+  @BeforeEach
+  void setUp() throws Exception
+  {
+    setUpExtra();
+    haproxy.start();
+    backend1.start();
+    // backend2.start();
+    // backend3.start();
+
+    Integer port = haproxy.getMappedPort(8400);
+    webClient = WebClient.create("http://localhost:" + port);
+
+    Awaitility
+        .await()
+        .atMost(Duration.ofMinutes(10))
+        .until(() -> WebClient
+            .create("http://localhost:" + backend1.getMappedPort(8080))
+            .get()
+            .uri("/actuator/health")
+            .exchangeToMono(response ->
+            {
+              if (response.statusCode().equals(HttpStatus.OK))
+              {
+                return response
+                    .bodyToMono(StatusTo.class)
+                    .map(StatusTo::getStatus)
+                    .map(status -> status.equalsIgnoreCase("UP"));
+              }
+              else
+              {
+                return Mono.just(false);
+              }
+            })
+            .block());
+
+    haproxy
+        .getDockerClient()
+        .killContainerCmd(haproxy.getContainerId())
+        .withSignal("HUP")
+        .exec();
+
+
+    Awaitility
+        .await()
+        .atMost(Duration.ofMinutes(10))
+        .until(() -> webClient
+            .get()
+            .uri("/actuator/health")
+            .exchangeToMono(response ->
+            {
+              if (response.statusCode().equals(HttpStatus.OK))
+              {
+                return response
+                    .bodyToMono(StatusTo.class)
+                    .map(StatusTo::getStatus)
+                    .map(status -> status.equalsIgnoreCase("UP"));
+              }
+              else
+              {
+                return Mono.just(false);
+              }
+            })
+            .block());
+  }
+
+  Network network = Network.newNetwork();
+
+  GenericContainer haproxy =
+      new GenericContainer(DockerImageName.parse("haproxytech/haproxy-debian:2.8"))
+          .withNetwork(network)
+          .withNetworkAliases("haproxy")
+          .withClasspathResourceMapping(
+              "haproxy.cfg",
+              "/usr/local/etc/haproxy/haproxy.cfg",
+              BindMode.READ_ONLY)
+          .withClasspathResourceMapping(
+              "sharding.map",
+              "/usr/local/etc/haproxy/sharding.map",
+              BindMode.READ_WRITE)
+          .withExposedPorts(8400, 8401, 8404)
+          .withLogConsumer(new Slf4jLogConsumer(log, true).withPrefix("HAPROXY"));
+
+  abstract String[] getCommandBackend1();
+  GenericContainer backend1 =
+      new GenericContainer(DockerImageName.parse("juplo/chat-backend:0.0.1-SNAPSHOT"))
+          .withImagePullPolicy(NEVER_PULL)
+          .withNetwork(network)
+          .withNetworkAliases("backend-1")
+          .withCommand(getCommandBackend1())
+          .withExposedPorts(8080)
+          .waitingFor(Wait.forLogMessage(".*Started\\ ChatBackendApplication.*\\n", 1))
+          .withLogConsumer(new Slf4jLogConsumer(log, true).withPrefix("BACKEND-1"));
+
+  abstract String[] getCommandBackend2();
+  GenericContainer backend2 =
+      new GenericContainer(DockerImageName.parse("juplo/chat-backend:0.0.1-SNAPSHOT"))
+          .withImagePullPolicy(NEVER_PULL)
+          .withNetwork(network)
+          .withNetworkAliases("backend-2")
+          .withCommand(getCommandBackend2())
+          .withExposedPorts(8080)
+          .waitingFor(Wait.forLogMessage(".*Started\\ ChatBackendApplication.*\\n", 1))
+          .withLogConsumer(new Slf4jLogConsumer(log, true).withPrefix("BACKEND-2"));
+
+  abstract String[] getCommandBackend3();
+  GenericContainer backend3 =
+      new GenericContainer(DockerImageName.parse("juplo/chat-backend:0.0.1-SNAPSHOT"))
+          .withImagePullPolicy(NEVER_PULL)
+          .withNetwork(network)
+          .withNetworkAliases("backend-3")
+          .withCommand(getCommandBackend3())
+          .withExposedPorts(8080)
+          .waitingFor(Wait.forLogMessage(".*Started\\ ChatBackendApplication.*\\n", 1))
+          .withLogConsumer(new Slf4jLogConsumer(log, true).withPrefix("BACKEND-3"));
+
+
+  @EqualsAndHashCode
+  @ToString
+  class User
+  {
+    @Getter
+    private final String name;
+    private int serial = 0;
+
+
+    User (String name)
+    {
+      this.name = name;
+    }
+
+
+    int nextSerial()
+    {
+      return ++serial;
+    }
+  }
+
+  @Getter
+  @Setter
+  static class StatusTo
+  {
+    String status;
+  }
+}