BDD-Driven Microservices

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Tools, techniques andreﬂections BDD-Driven Microservices in Java

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John Ferguson Smart Introductions “I help teamsof smart people   learn to work together more efﬁciently,   to deliver better software faster”

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Independently Deployable Bounded ContextsLoosely CoupledSingle Responsibility Microservices101

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Microservices 101 Movie Catalog Service Authentication Service ShoppingCart Service Delivery Service Payment Service REST/HTTP

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Microservices 101 Movie Catalog Service Authentication Service ShoppingCart Service Delivery Service Payment Service Event Bus

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Microservices 101 Movie CatalogService

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Microservices 101 Movie CatalogService Resource

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Microservices 101 Movie CatalogService Resource Service Layer Domain model Repositories

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Microservices 101 Movie CatalogService Resource Persistance Layer Service Layer Domain model Repositories

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Microservices 101 Movie CatalogService Resource Persistance Layer Gateway Service Layer Domain model Repositories

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The testing pyramid

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The testing pyramid UnitTests

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The testing pyramid UnitTests Integration Tests

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The testing pyramid UnitTests Integration Tests End-to-end Tests

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The testing pyramid MovieCatalog Service Resource Persistance Layer Gateway Service Layer Domain model Repositories Unit Tests

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The testing pyramid MovieCatalog Service Resource Persistance Layer Gateway Service Layer Domain model Repositories Integration Tests

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The testing pyramidEnd-to-End Tests Movie Catalog Service Authentication Service Shopping Cart Service Delivery Service Payment Service Event Bus

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To document how tointeract with the microservice To document what the microservice does To ensure the service work correctly To ensure we are delivering valuable functionality Why test our micro-services?

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“We test ourmicro-services so we can deploy new features quickly and with conﬁdence”

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And with aggressive production monitoring Writing executable specificationsand living documentation To a sufficient level of confidence Outside-in testing Pragmatic web service testing

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Outside-in development

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To deliver software that matters Anda common language to build a shared understanding Using examples at multiple levels Collaborate to discover requirements and identify uncertainty The essence of BDD

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The business owner tellsthe business analyst what he wants 1 2 The business analyst writes a requirements document 3 The developer translates the requirements into software 4 The tester translates the requirements into test cases 5 The technical writer translates the software into functional and technical documentation A traditional development process How does it work?

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How does itwork? The business owner and the business analyst have a conversation about what he needs. 1 2 3 4 The tester uses these scenarios as the basis for her tests 5 The automated tests provide feedback on progress and help document the application The business analyst, the developer and the tester elaborate the requirements together. The scenarios guide the developer and act as automated tests They define requirements as structured, English- language format "scenarios" A BDD development process

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But what aboutmicro-services?

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A different testingpyramid

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A different testingpyramid Executable Business Speciﬁcations

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A different testingpyramid Slow-running executable technical speciﬁcations Executable Business Speciﬁcations

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A different testingpyramid Fast-running executable technical specifications Slow-running executable technical specifications Executable Business Specifications

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Outside-in development Movie CatalogService Resource Persistance Layer Gateway Service Layer Domain model Repositories Executable Business specs

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Outside-in development Movie CatalogService Resource Persistance Layer Gateway Service Layer Domain model Repositories Slow-running technical specs

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Outside-in development Movie CatalogService Resource Persistance Layer Gateway Service Layer Domain model Repositories Slow-running technical specs @ContextConfiguration(loader = SpringApplicationContextLoader.class, classes = MovieServiceApplication.class)  @WebAppConfiguration  @IntegrationTest("server.port:0")  class WhenFindingMoviesViaTheRestAPI extends Specification {    @Autowired  MovieRepository movieRepository;    @Value('${local.server.port}')  int port;    def "should list movies by director"() {  given:  movieCatalogContains([GLADIATOR, LETTERS_FROM_IWO_JIMA, GRAN_TORINO])  when:  List<Movie> movies = when().get("/movies/findByDirector/Clint Eastwood").as(List)  then:  movies.collect {movie -> movie.title} == ["Letters from Iwo Jima", "Gran Torino"]  }

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Outside-in development Movie CatalogService Resource Persistance Layer Gateway Service Layer Domain model Repositories Fast- running technical specs

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Outside-in development Movie CatalogService Resource Persistance Layer Gateway Service Layer Domain model Repositories Fast- running technical specs def setup() {  repository = Mock(MovieRepository)  artistService = new ArtistService(movieRepository: repository)  }    def "should build actor details from films the artist has acted in and has directed"() {  given: "Clint Eastwood has directed some films"  repository.findByDirector("Clint Eastwood") >> [LETTERS_FROM_IWO_JIMA, GRAN_TORINO]  and: "Clint Eastwood has starred in some films"  repository.findByActors("Clint Eastwood") >> [THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO]  when:  def artistDetails = artistService.findArtistByName("Clint Eastwood")  then:  artistDetails.isPresent()  and:  artistDetails.get().name == "Clint Eastwood" &&  artistDetails.get().filmsActedIn == [THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO] &&  artistDetails.get().filmsDirected == [LETTERS_FROM_IWO_JIMA, GRAN_TORINO]  } Spock

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Outside-in development Movie CatalogService Resource Persistance Layer Gateway Service Layer Domain model Repositories Fast- running technical specs

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Outside-in development Movie CatalogService Resource Persistance Layer Gateway Service Layer Domain model Repositories Fast- running technical specs class MovieControllerSpecs extends Specification {    MovieRepository movieRepository = Mock()    def "should find by director regardless of case (#director -> #filteredDirector)"() {  given:  def controller = new MovieController(repository: movieRepository)  when:  controller.findByDirector(director)  then:  1*movieRepository.findByDirector(filteredDirector)  where:  director | filteredDirector  "Clint Eastwood" | "Clint Eastwood"  "Clint eastwood" | "Clint Eastwood" Spock

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Micro-service Contracts

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Micro-service Contracts Movie CatalogService Resource Persistance Layer Gateway Service Layer Domain model Repositories Shopping Cart Service Delivery Service REST/HTTP

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Micro-service Contracts Movie CatalogService Resource Persistance Layer Gateway Service Layer Domain model Repositories Shopping Cart Service REST/HTTP Delivery Service

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Micro-service Contracts Movie CatalogService Resource Persistance Layer Gateway Service Layer Domain model Repositories Shopping Cart Service REST/HTTP Consumer Delivery Service

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Micro-service Contracts Movie CatalogService Resource Persistance Layer Gateway Service Layer Domain model Repositories Shopping Cart Service REST/HTTP Consumer Producer Delivery Service

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Micro-service Contracts Movie CatalogService Resource Persistance Layer Gateway Service Layer Domain model Repositories Shopping Cart Service REST/HTTP Consumer Producer Contract Delivery Service

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Micro-service Contracts Movie CatalogService Resource Persistance Layer Gateway Service Layer Domain model Repositories Shopping Cart Service REST/HTTP Contract Delivery Service

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Micro-service Contracts Movie CatalogService Resource Persistance Layer Gateway Service Layer Domain model Repositories Shopping Cart Service Delivery Service REST/HTTP Contract Mock Shopping Cart Service

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Micro-service Contracts REST/HTTP Movie Catalog Service Webapp iPhone app Android app

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Micro-service Contracts REST/HTTP Movie Catalog Service Webapp iPhone app Android app Producer

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Micro-service Contracts REST/HTTP Movie Catalog Service Webapp iPhone app Android app Consumer Producer

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Micro-service Contracts REST/HTTP Movie Catalog Service Webapp iPhone app Android app Consumer Producer Consumer

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Micro-service Contracts REST/HTTP Movie Catalog Service Webapp iPhone app Android app Consumer Producer Consumer Consumer

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Micro-service Contracts REST/HTTP Movie Catalog Service Webapp iPhone app Android app Consumer Producer Consumer Consumer Contract

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Micro-service Contracts REST/HTTP Movie Catalog Service Webapp iPhone app Android app Consumer Producer Consumer Consumer Contract The Producer API is the sum of the Consumer Contrats

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Specialised ToolsPublished speciﬁcationsAutomatedAcceptance Criteria Verifying the contracts

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PactPactoMountebank More specialised tools

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Pact and Pacto  ConsumerDriven Contract Testing 42 Consumer Movie Catalog Service

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Pact and Pacto  ConsumerDriven Contract Testing 42 Consumer Movie Catalog Service Mock Service Pact help us create and conﬁgure a mock service

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Pact and Pacto  ConsumerDriven Contract Testing 43 Consumer Movie Catalog Service Mock Service

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Pact and Pacto  ConsumerDriven Contract Testing 43 Consumer Movie Catalog Service Mock Service We write speciﬁcations to describe the expected behaviour of the service

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Pact and Pacto  ConsumerDriven Contract Testing 44 Consumer Movie Catalog Service Mock Service

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Pact and Pacto  ConsumerDriven Contract Testing 44 Consumer Movie Catalog Service Mock Service When we run these speciﬁcations, the expected behaviour is recorded in a ‘pact’ ﬁle asdasdasda asdasdasdas asdasdasd asdasdasda asdasdasdasd asdasdasdasd asdasdasdas

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Pact and Pacto  ConsumerDriven Contract Testing 45 Consumer Movie Catalog Service Mock Service asdasdasda asdasdasdas asdasdasd asdasdasda asdasdasdasd asdasdasdasd asdasdasdas

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Pact and Pacto  ConsumerDriven Contract Testing 45 Consumer Movie Catalog Service Mock Service We can now use this ‘pact’ to test(drive) the service implementation asdasdasda asdasdasdas asdasdasd asdasdasda asdasdasdasd asdasdasdasd asdasdasdas

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Levels of conﬁdence

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From BDD toTDD “How much automated testing?  As much as you need, but no more.”

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Acceptance testing

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Acceptance testing

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Acceptance testing

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Feature: Adding newmovies  In order to sell more movies  As an online movie seller  I want to be able to add movies to the catalog    Scenario: Adding movies  Given the following movie has just come out  | title | director | actors |  | Jurassic World | Colin Trevorrow | Chris Pratt, Bryce Dallas Howard |  When I add this movie to the catalog  Then I should be able to find it in the catalog

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Feature: Adding newmovies  In order to sell more movies  As an online movie seller  I want to be able to add movies to the catalog    Scenario: Adding movies  Given the following movie has just come out  | title | director | actors |  | Jurassic World | Colin Trevorrow | Chris Pratt, Bryce Dallas Howard |  When I add this movie to the catalog  Then I should be able to find it in the catalog @When("I add this movie to the catalog")  public void addMovieToCatalog() {  movieId = rest().given().contentType("application/json")  .content(newMovie)  .post("/movies")  .then().statusCode(200)  .and().extract().jsonPath().getString("id");  }

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Feature: Adding newmovies  In order to sell more movies  As an online movie seller  I want to be able to add movies to the catalog    Scenario: Adding movies  Given the following movie has just come out  | title | director | actors |  | Jurassic World | Colin Trevorrow | Chris Pratt, Bryce Dallas Howard |  When I add this movie to the catalog  Then I should be able to find it in the catalog @Then("I should be able to find it in the catalog")  public void shouldBeAbleToFindMovieInCatalog() {  rest().given().contentType("application/json")  .get("/movies/{movieId}", movieId)  .then().statusCode(200)  .and().body("title", equalTo(newMovie.getTitle()))  .and().body("director", equalTo(newMovie.getDirector()));  }

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Feature: Adding newmovies  In order to sell more movies  As an online movie seller  I want to be able to add movies to the catalog    Scenario: Adding movies  Given the following movie has just come out  | title | director | actors |  | Jurassic World | Colin Trevorrow | Chris Pratt, Bryce Dallas Howard |  When I add this movie to the catalog  Then I should be able to find it in the catalog @Then("I should be able to find it in the catalog")  public void shouldBeAbleToFindMovieInCatalog() {  rest().given().contentType("application/json")  .get("/movies/{movieId}", movieId)  .then().statusCode(200)  .and().body("title", equalTo(newMovie.getTitle()))  .and().body("director", equalTo(newMovie.getDirector()));  } Rest Assured + Serenity

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Feature: Adding newmovies  In order to sell more movies  As an online movie seller  I want to be able to add movies to the catalog    Scenario: Adding movies  Given the following movie has just come out  | title | director | actors |  | Jurassic World | Colin Trevorrow | Chris Pratt, Bryce Dallas Howard |  When I add this movie to the catalog  Then I should be able to find it in the catalog @Then("I should be able to find it in the catalog")  public void shouldBeAbleToFindMovieInCatalog() {  rest().given().contentType("application/json")  .get("/movies/{movieId}", movieId)  .then().statusCode(200)  .and().body("title", equalTo(newMovie.getTitle()))  .and().body("director", equalTo(newMovie.getDirector()));  }

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Testing REST serviceswith Rest-Assured

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Testing REST serviceswith Rest-Assured get(“/movies/findByTitle/Gladiator") .then().body("title", equalTo("Gladiator"));

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Testing REST serviceswith Rest-Assured get(“/movies/findByTitle/Gladiator") .then().body("title", equalTo("Gladiator"));

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Testing REST serviceswith Rest-Assured when().get(“/movies/findByTitle/Gladiator”) .then().body("nominations.category", hasItems("Best Actor", "Special Effects"));

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Testing REST serviceswith Rest-Assured when().get(“/movies/findByTitle/Gladiator”) .then().body("nominations.category", hasItems("Best Actor", "Special Effects"));

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Testing REST serviceswith Rest-Assured given().contentType("application/json")  .content(newMovie)  .post("/movies")  .then().statusCode(200)  .and().extract().jsonPath().getString("id");

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Testing REST serviceswith Rest-Assured given().contentType("application/json")  .content(newMovie)  .post("/movies")  .then().statusCode(200)  .and().extract().jsonPath().getString("id"); Posting data

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Testing REST serviceswith Rest-Assured Movie matchingMovie = get("/movies/findByTitle/Gladiator").as(Movie.class);

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Testing REST serviceswith Rest-Assured Movie matchingMovie = get("/movies/findByTitle/Gladiator").as(Movie.class); Convert responses to Java objects

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Testing REST serviceswith Rest-Assured given().param("title","Unknown").  when().get("/movies/search").  then().statusCode(404);

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Testing REST serviceswith Rest-Assured given().param("title","Unknown").  when().get("/movies/search").  then().statusCode(404); Check for errors

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Resource-level testing

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Resource-level testing Spock

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57 @ContextConfiguration(loader = SpringApplicationContextLoader.class, classes= MovieServiceApplication.class)  @WebAppConfiguration  @IntegrationTest("server.port:0")  class WhenFindingMovies extends Specification {    @Autowired  MovieRepository movieRepository;    @Value('${local.server.port}')  int port;    def setup() {  movieRepository.deleteAll();  RestAssured.port = port;  }    def "should list all movies"() {  given:  movieCatalogContains([GLADIATOR, LETTERS_FROM_IWO_JIMA, GRAN_TORINO])  when:  def movies = when().get("/movies").as(List)  then:  movies.collect {movie -> movie.title} == ["Gladiator",   "Letters from Iwo Jima",   "Gran Torino"]  }

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57 @ContextConfiguration(loader = SpringApplicationContextLoader.class, classes= MovieServiceApplication.class)  @WebAppConfiguration  @IntegrationTest("server.port:0")  class WhenFindingMovies extends Specification {    @Autowired  MovieRepository movieRepository;    @Value('${local.server.port}')  int port;    def setup() {  movieRepository.deleteAll();  RestAssured.port = port;  }    def "should list all movies"() {  given:  movieCatalogContains([GLADIATOR, LETTERS_FROM_IWO_JIMA, GRAN_TORINO])  when:  def movies = when().get("/movies").as(List)  then:  movies.collect {movie -> movie.title} == ["Gladiator",   "Letters from Iwo Jima",   "Gran Torino"]  } Spring Context

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57 @ContextConfiguration(loader = SpringApplicationContextLoader.class, classes= MovieServiceApplication.class)  @WebAppConfiguration  @IntegrationTest("server.port:0")  class WhenFindingMovies extends Specification {    @Autowired  MovieRepository movieRepository;    @Value('${local.server.port}')  int port;    def setup() {  movieRepository.deleteAll();  RestAssured.port = port;  }    def "should list all movies"() {  given:  movieCatalogContains([GLADIATOR, LETTERS_FROM_IWO_JIMA, GRAN_TORINO])  when:  def movies = when().get("/movies").as(List)  then:  movies.collect {movie -> movie.title} == ["Gladiator",   "Letters from Iwo Jima",   "Gran Torino"]  } Spring Integration Tests

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57 @ContextConfiguration(loader = SpringApplicationContextLoader.class, classes= MovieServiceApplication.class)  @WebAppConfiguration  @IntegrationTest("server.port:0")  class WhenFindingMovies extends Specification {    @Autowired  MovieRepository movieRepository;    @Value('${local.server.port}')  int port;    def setup() {  movieRepository.deleteAll();  RestAssured.port = port;  }    def "should list all movies"() {  given:  movieCatalogContains([GLADIATOR, LETTERS_FROM_IWO_JIMA, GRAN_TORINO])  when:  def movies = when().get("/movies").as(List)  then:  movies.collect {movie -> movie.title} == ["Gladiator",   "Letters from Iwo Jima",   "Gran Torino"]  } Rest Assured

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57 @ContextConfiguration(loader = SpringApplicationContextLoader.class, classes= MovieServiceApplication.class)  @WebAppConfiguration  @IntegrationTest("server.port:0")  class WhenFindingMovies extends Specification {    @Autowired  MovieRepository movieRepository;    @Value('${local.server.port}')  int port;    def setup() {  movieRepository.deleteAll();  RestAssured.port = port;  }    def "should list all movies"() {  given:  movieCatalogContains([GLADIATOR, LETTERS_FROM_IWO_JIMA, GRAN_TORINO])  when:  def movies = when().get("/movies").as(List)  then:  movies.collect {movie -> movie.title} == ["Gladiator",   "Letters from Iwo Jima",   "Gran Torino"]  }

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Controller-level testing

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Controller-level testing Spock

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Controller-level testing Spock

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@ContextConfiguration(loader = SpringApplicationContextLoader.class,  classes= MovieServiceApplication.class)  @WebAppConfiguration  @IntegrationTest  class WhenViewingActorDetailsViaTheController extends Specification {    @Autowired  ArtistController artistController;    def "should retrieve actor details for an artist"() {  given:  movieCatalogContains([GLADIATOR, LETTERS_FROM_IWO_JIMA,  THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO])  when:  Artist artist = artistController.findArtistDetails("Clint Eastwood")  then:  artist.name == "Clint Eastwood"  and:  artist.filmsActedIn.containsAll(THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO)  and:  artist.filmsDirected.containsAll(LETTERS_FROM_IWO_JIMA, GRAN_TORINO)  }

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@ContextConfiguration(loader = SpringApplicationContextLoader.class,  classes= MovieServiceApplication.class)  @WebAppConfiguration  @IntegrationTest  class WhenViewingActorDetailsViaTheController extends Specification {    @Autowired  ArtistController artistController;    def "should retrieve actor details for an artist"() {  given:  movieCatalogContains([GLADIATOR, LETTERS_FROM_IWO_JIMA,  THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO])  when:  Artist artist = artistController.findArtistDetails("Clint Eastwood")  then:  artist.name == "Clint Eastwood"  and:  artist.filmsActedIn.containsAll(THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO)  and:  artist.filmsDirected.containsAll(LETTERS_FROM_IWO_JIMA, GRAN_TORINO)  } Use a fully wired controller

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@ContextConfiguration(loader = SpringApplicationContextLoader.class,  classes= MovieServiceApplication.class)  @WebAppConfiguration  @IntegrationTest  class WhenViewingActorDetailsViaTheController extends Specification {    @Autowired  ArtistController artistController;    def "should retrieve actor details for an artist"() {  given:  movieCatalogContains([GLADIATOR, LETTERS_FROM_IWO_JIMA,  THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO])  when:  Artist artist = artistController.findArtistDetails("Clint Eastwood")  then:  artist.name == "Clint Eastwood"  and:  artist.filmsActedIn.containsAll(THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO)  and:  artist.filmsDirected.containsAll(LETTERS_FROM_IWO_JIMA, GRAN_TORINO)  } Use domain objects rather than REST calls

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@ContextConfiguration(loader = SpringApplicationContextLoader.class,  classes= MovieServiceApplication.class)  @WebAppConfiguration  @IntegrationTest  class WhenViewingActorDetailsViaTheController extends Specification {    @Autowired  ArtistController artistController;    def "should retrieve actor details for an artist"() {  given:  movieCatalogContains([GLADIATOR, LETTERS_FROM_IWO_JIMA,  THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO])  when:  Artist artist = artistController.findArtistDetails("Clint Eastwood")  then:  artist.name == "Clint Eastwood"  and:  artist.filmsActedIn.containsAll(THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO)  and:  artist.filmsDirected.containsAll(LETTERS_FROM_IWO_JIMA, GRAN_TORINO)  }

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Service or domain-leveltesting

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Service or domain-leveltesting Spock

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MovieRepository repository  def artistService    defsetup() {  repository = Mock(MovieRepository)  artistService = new ArtistService(movieRepository: repository)  }    def "should build actor details from films the artist has acted in and has directed"() {  given: "Clint Eastwood has directed some films"  repository.findByDirector("Clint Eastwood") >> [LETTERS_FROM_IWO_JIMA, GRAN_TORINO]  and: "Clint Eastwood has starred in some films"  repository.findByActors("Clint Eastwood") >> [THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO]  when:  def artistDetails = artistService.findArtistByName("Clint Eastwood")  then:  artistDetails.isPresent()  and:  artistDetails.get().name == "Clint Eastwood" &&  artistDetails.get().filmsActedIn == [THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO] &&  artistDetails.get().filmsDirected == [LETTERS_FROM_IWO_JIMA, GRAN_TORINO]  }

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MovieRepository repository  def artistService    defsetup() {  repository = Mock(MovieRepository)  artistService = new ArtistService(movieRepository: repository)  }    def "should build actor details from films the artist has acted in and has directed"() {  given: "Clint Eastwood has directed some films"  repository.findByDirector("Clint Eastwood") >> [LETTERS_FROM_IWO_JIMA, GRAN_TORINO]  and: "Clint Eastwood has starred in some films"  repository.findByActors("Clint Eastwood") >> [THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO]  when:  def artistDetails = artistService.findArtistByName("Clint Eastwood")  then:  artistDetails.isPresent()  and:  artistDetails.get().name == "Clint Eastwood" &&  artistDetails.get().filmsActedIn == [THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO] &&  artistDetails.get().filmsDirected == [LETTERS_FROM_IWO_JIMA, GRAN_TORINO]  } Mocked repositories

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MovieRepository repository  def artistService    defsetup() {  repository = Mock(MovieRepository)  artistService = new ArtistService(movieRepository: repository)  }    def "should build actor details from films the artist has acted in and has directed"() {  given: "Clint Eastwood has directed some films"  repository.findByDirector("Clint Eastwood") >> [LETTERS_FROM_IWO_JIMA, GRAN_TORINO]  and: "Clint Eastwood has starred in some films"  repository.findByActors("Clint Eastwood") >> [THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO]  when:  def artistDetails = artistService.findArtistByName("Clint Eastwood")  then:  artistDetails.isPresent()  and:  artistDetails.get().name == "Clint Eastwood" &&  artistDetails.get().filmsActedIn == [THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO] &&  artistDetails.get().filmsDirected == [LETTERS_FROM_IWO_JIMA, GRAN_TORINO]  } Call the service

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MovieRepository repository  def artistService    defsetup() {  repository = Mock(MovieRepository)  artistService = new ArtistService(movieRepository: repository)  }    def "should build actor details from films the artist has acted in and has directed"() {  given: "Clint Eastwood has directed some films"  repository.findByDirector("Clint Eastwood") >> [LETTERS_FROM_IWO_JIMA, GRAN_TORINO]  and: "Clint Eastwood has starred in some films"  repository.findByActors("Clint Eastwood") >> [THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO]  when:  def artistDetails = artistService.findArtistByName("Clint Eastwood")  then:  artistDetails.isPresent()  and:  artistDetails.get().name == "Clint Eastwood" &&  artistDetails.get().filmsActedIn == [THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO] &&  artistDetails.get().filmsDirected == [LETTERS_FROM_IWO_JIMA, GRAN_TORINO]  } Check the outcomes

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MovieRepository repository  def artistService    defsetup() {  repository = Mock(MovieRepository)  artistService = new ArtistService(movieRepository: repository)  }    def "should build actor details from films the artist has acted in and has directed"() {  given: "Clint Eastwood has directed some films"  repository.findByDirector("Clint Eastwood") >> [LETTERS_FROM_IWO_JIMA, GRAN_TORINO]  and: "Clint Eastwood has starred in some films"  repository.findByActors("Clint Eastwood") >> [THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO]  when:  def artistDetails = artistService.findArtistByName("Clint Eastwood")  then:  artistDetails.isPresent()  and:  artistDetails.get().name == "Clint Eastwood" &&  artistDetails.get().filmsActedIn == [THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO] &&  artistDetails.get().filmsDirected == [LETTERS_FROM_IWO_JIMA, GRAN_TORINO]  }

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Living Documentation

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Living Documentation

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Living Functional Documentation withSerenity and Cucumber

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66

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66 Context

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66 Context Narrative

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67 Technical details

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Living API Documentation  with Swagger Springfox

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69 YAML Speciﬁcations Documentation website Client librariesTest stubs

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70 @RequestMapping(method = GET)  @ApiOperation("Listall the movies in the catalog")  public List<Movie> findAll() {  return repository.findAll();  }    @RequestMapping(method = POST)  @ApiOperation(value = "Add a new movie to the catalog", httpMethod = "POST")  public Movie add(@RequestBody Movie newMovie) {  return repository.save(newMovie);  }    @RequestMapping(value = "/{id}", method = DELETE)  @ApiOperation(value = "Removing a movie from the catalog", httpMethod = "DELETE")  public void delete(@PathVariable String id) {  repository.delete(id);  }  Springfox Some annotations… Swagger and Spring Boot

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71 Springfox @EnableAutoConfiguration  @EnableSwagger2  public class MovieServiceApplication{    public static void main(String[] args) {  SpringApplication.run(MovieServiceApplication.class, args);  }    @Bean  public Docket moviesApi() {  return new Docket(DocumentationType.SWAGGER_2)  .select()  .apis(RequestHandlerSelectors.any())  .paths(PathSelectors.any())  .build()  .pathMapping("/")  .directModelSubstitute(LocalDate.class, String.class)  .genericModelSubstitutes(ResponseEntity.class);  }  } Some conﬁguration… Swagger and Spring Boot

206.
72 Springfox Documentation  bundled with your webservices Swagger and Spring Boot

207.
Production monitoring

208.
Automated MonitoringFast provisioningAfast deployment pipeline So you want to micro-service?

209.
Automated health checksRealoperationsSmoke tests in production Simple checks may not be enough

210.
An example withSpring Actuator @Component  public class CatalogHealth implements HealthIndicator {    @Autowired  MovieRepository movieRepository;    @Override  public Health health() {  return (isCatalogStocked()) ?   Health.status(new Status("UP", "Movie count: " + movieRepository.count())).build()   : Health.down().build();  }    private boolean isCatalogStocked() {  return (movieRepository.count() > 0);  }  }

211.
An example withSpring Actuator @Component  public class CatalogHealth implements HealthIndicator {    @Autowired  MovieRepository movieRepository;    @Override  public Health health() {  return (isCatalogStocked()) ?   Health.status(new Status("UP", "Movie count: " + movieRepository.count())).build()   : Health.down().build();  }    private boolean isCatalogStocked() {  return (movieRepository.count() > 0);  }  } A Spring Actuator Health Check

212.
An example withSpring Actuator @Component  public class CatalogHealth implements HealthIndicator {    @Autowired  MovieRepository movieRepository;    @Override  public Health health() {  return (isCatalogStocked()) ?   Health.status(new Status("UP", "Movie count: " + movieRepository.count())).build()   : Health.down().build();  }    private boolean isCatalogStocked() {  return (movieRepository.count() > 0);  }  } A Spring Actuator Health Check Custom logic to decide if the app is working

213.
An example withSpring Actuator @Component  public class MovieTransactionHealth implements HealthIndicator {    @Autowired  MovieController movieController;    @Override  public Health health() {  return Health.status(transactionStatus()).build();  }    private Status transactionStatus() {  try {  Movie movie = new Movie("TEST title", "TEST description", "TEST director", ImmutableList.of("TEST actor"));  Movie reloadedMovie = movieController.add(movie);  movieController.delete(reloadedMovie.getId());  return Status.UP;  } catch (Throwable e) {  return new Status("DOWN", e.toString());  }  }  }

214.
An example withSpring Actuator @Component  public class MovieTransactionHealth implements HealthIndicator {    @Autowired  MovieController movieController;    @Override  public Health health() {  return Health.status(transactionStatus()).build();  }    private Status transactionStatus() {  try {  Movie movie = new Movie("TEST title", "TEST description", "TEST director", ImmutableList.of("TEST actor"));  Movie reloadedMovie = movieController.add(movie);  movieController.delete(reloadedMovie.getId());  return Status.UP;  } catch (Throwable e) {  return new Status("DOWN", e.toString());  }  }  } More complex custom logic

215.
An example withSpring Actuator @Component  public class MovieTransactionHealth implements HealthIndicator {    @Autowired  MovieController movieController;    @Override  public Health health() {  return Health.status(transactionStatus()).build();  }    private Status transactionStatus() {…}  } @Component  public class CatalogHealth implements HealthIndicator {    @Autowired  MovieRepository movieRepository;    @Override  public Health health() {  return (isCatalogStocked()) ?   Health.status(new Status("UP", "Movie count: " +   movieRepository.count())).build()   : Health.down().build();  }    private boolean isCatalogStocked() {…}  }

216.
Try all thisout at home! Install Gradle Install MongoDB Clone the repowakaleo/movie-service

217.
Questions? John Ferguson Smart john.smart@wakaleo.com wakaleo http://www.wakaleo.com

BDD-Driven Microservices

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