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はやい・やすい・うまい!スタートアップでも使える Retrofit + RxJava で瞬間A...
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Fumihiko Shiroyama
July 14, 2017
Technology
2
620
はやい・やすい・うまい!スタートアップでも使える Retrofit + RxJava で瞬間APIクッキングレシピ
はやい・やすい・うまい!スタートアップでも使える Retrofit + RxJava で瞬間APIクッキングレシピ
Fumihiko Shiroyama
July 14, 2017
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Transcript
͍ɾ͍͢ɾ͏·͍ʂ ελʔτΞοϓͰ͑Δ Retrofit + RxJava ͰॠؒAPIΫο ΩϯάϨγϐ @fushiroyama
About Me • Fumihiko Shiroyama • Android App Developer •
https://github.com/srym
How to implement REST Client? • HTTP Client • Thread
Executer • JSON Deserializer • Integration with RxJava
Retrofit
Retrofit • A type-safe HTTP client for Android and Java
• http://square.github.io/retrofit/ • by Square
Install // Retrofit compile "com.squareup.retrofit2:retrofit:${retrofitVersion}" compile "com.squareup.retrofit2:adapter-rxjava2:${retrofitVersion}" compile "com.squareup.retrofit2:converter-gson:${retrofitVersion}" //
RxJava compile 'io.reactivex.rxjava2:rxandroid:2.0.1' compile "io.reactivex.rxjava2:rxjava:2.1.1"
Retrofit public interface GitHubService { @GET("users/{user}/repos") Call<List<Repo>> listRepos(@Path("user") String user);
}
Retrofit Retrofit retrofit = new Retrofit.Builder() .baseUrl("https://api.github.com/") .build(); GitHubService service
= retrofit.create(GitHubService.class);
Retrofit GitHubService service = retrofit.create(GitHubService.class); Call<List<Repo>> repos = service.listRepos("srym"); //
synchronous call Response<List<Repo>> response = repos.execute(); // asynchronous call repos.enqueue( /* callback here */ );
Integration with RxJava Retrofit retrofit = new Retrofit.Builder() .addCallAdapterFactory(RxJava2CallAdapterFactory.create()) .addConverterFactory(GsonConverterFactory.create(gson))
.baseUrl("https://api.github.com/") .build();
Change Return Type public interface GitHubService { @GET("users/{user}/repos") Single<List<Repo>> listRepos(@Path("user")
String user); }
Subscribe Single<List<Repo>> repos = service.listRepos("srym") repos .subscribe( list -> doSomethingToList(list),
throwable -> Timber.d(throwable.getMessage(), throwable), () -> Timber.d("complete") );
Link • RxJava+RetrofitͰAPI௨৴पΓΛ࣮͢Δ͏͑ Ͱ࠷ݶͷࣝΛ30Ͱ٧ΊࠐΉ • http://qiita.com/FumihikoSHIROYAMA/ items/201536d9b45ef21b6bc7
Link • RetrofitΛͬͨOAuth࠶ೝূΞϓϩʔν • http://qiita.com/FumihikoSHIROYAMA/ items/ac1beaeaa9b4baaed939
Link • RetrofitΛͬͨAPIݺͼग़͠ͰϦΧόϦՄೳ ͳHTTPΤϥʔΛͲ͏ѻ͏͔ • http://qiita.com/FumihikoSHIROYAMA/ items/65d52aea1a9f324d347e
What's Good about Retrofit + Rx • Easy to define
• Easy to compose • Easy to test
Test • MockWebServer • TestSubscriber
MockWebServer • A scriptable web server for testing HTTP clients
• https://github.com/square/okhttp/tree/ master/mockwebserver
MockWebServer private final MockWebServer mockWebServer = new MockWebServer();
MockWebServer Dispatcher dispatcher = new Dispatcher() { @Override public MockResponse
dispatch(RecordedRequest request) throws InterruptedException { return new MockResponse().setResponseCode(404); } }; mockWebServer.setDispatcher(dispatcher); mockWebServer.start();
MockWebServer @Override public MockResponse dispatch(RecordedRequest request) { if (request ==
null || request.getPath() == null) { return new MockResponse().setResponseCode(400); } if (request.getPath().matches("/users/.+/repos")) { return new MockResponse().setBody( readJsonFromResources("users_repos.json") ).setResponseCode(200); } return new MockResponse().setResponseCode(404); }
MockWebServer Retrofit retrofit = new Retrofit.Builder() .baseUrl(mockWebServer.url("")) .addCallAdapterFactory(RxJava2CallAdapterFactory.create()) .addConverterFactory(GsonConverterFactory.create()) .build();
GitHubService gitHubService = retrofit.create(GitHubService.class);
TestSubscriber • A TestSubscriber is a variety of Subscriber that
you can use for unit testing, to perform assertions, inspect received events, or wrap a mocked Subscriber. • http://reactivex.io/RxJava/javadoc/rx/ observers/TestSubscriber.html
TestSubscriber restGitHubDataSource .listRepos("srym") .test();
TestSubscriber List<Repo> repos = restGitHubDataSource.listRepos("srym") .test() .await() .assertNoErrors() .assertComplete() .values()
.get(0); assertThat(repos).isNotNull();
TestSubscriber • https://github.com/srym/Architecture • https://github.com/srym/Architecture/blob/ master/app/src/test/java/us/shiroyama/ android/architecture/infrastructure/ repository/datasource/remote/ RestGitHubDataSourceTest.java
Easy to compose • Rx's Observable is easily & flexibly
combined • Avoid callback hells
Easy to compose public class GitHubInfraRepository implements GitHubRepository { private
final RemoteGitHubDataSource remoteDataSource; private final RepoMapper mapper; @Inject public GitHubInfraRepository(RemoteGitHubDataSource remoteDataSource, RepoMapper mapper) { this.remoteDataSource = remoteDataSource; this.mapper = mapper; } @Override public Single<List<RepoModel>> listRepos(@NonNull String user) { return remoteDataSource .listRepos(user) .map(mapper::convert); } }
Easy to compose private final RemoteGitHubDataSource remoteDataSource; private final LocalGitHubDataSource
localGitHubDataSource; private final RepoMapper mapper; @Inject public GitHubInfraRepository(RemoteGitHubDataSource remoteDataSource, LocalGitHubDataSource localGitHubDataSource, RepoMapper mapper) { this.remoteDataSource = remoteDataSource; this.localGitHubDataSource = localGitHubDataSource; this.mapper = mapper; }
Easy to compose @Override public Single<List<RepoModel>> listRepos(@NonNull String user) {
return remoteDataSource .listRepos(user) .map(mapper::convert);
Easy to compose public Single<List<RepoModel>> listRepos(@NonNull String user) { return
localGitHubDataSource .listRepos(user) .onErrorResumeNext( remoteDataSource .listRepos(user) .retry(DEFAULT_RETRY) .doOnSuccess(localGitHubDataSource::save) ) .map(mapper::convert);
Android Clean Architecture • android10/Android-CleanArchitecture • https://github.com/android10/Android- CleanArchitecture • srym/Architecture
• https://github.com/srym/Architecture
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