作者:小岳不在家 | 来源:互联网 | 2023-02-04 11:17
嘿,我正在使用Dagger2
,Retrofit
而且OkHttp
我正面临依赖循环问题.
提供时OkHttp
:
@Provides
@ApplicationScope
OkHttpClient provideOkHttpClient(TokenAuthenticator auth,Dispatcher dispatcher){
return new OkHttpClient.Builder()
.connectTimeout(Constants.CONNECT_TIMEOUT, TimeUnit.SECONDS)
.readTimeout(Constants.READ_TIMEOUT,TimeUnit.SECONDS)
.writeTimeout(Constants.WRITE_TIMEOUT,TimeUnit.SECONDS)
.authenticator(auth)
.dispatcher(dispatcher)
.build();
}
提供时Retrofit
:
@Provides
@ApplicationScope
Retrofit provideRetrofit(Resources resources,Gson gson, OkHttpClient okHttpClient){
return new Retrofit.Builder()
.baseUrl(resources.getString(R.string.base_api_url))
.addConverterFactory(GsonConverterFactory.create(gson))
.addCallAdapterFactory(RxJava2CallAdapterFactory.create())
.client(okHttpClient)
.build();
}
提供时APIService
:
@Provides
@ApplicationScope
APIService provideAPI(Retrofit retrofit) {
return retrofit.create(APIService.class);
}
我的APIService
界面:
public interface APIService {
@FormUrlEncoded
@POST("token")
Observable> refreshUserToken();
--- other methods like login, register ---
}
我的TokenAuthenticator
班级:
@Inject
public TokenAuthenticator(APIService mApi,@NonNull ImmediateSchedulerProvider mSchedulerProvider) {
this.mApi= mApi;
this.mSchedulerProvider=mSchedulerProvider;
mDisposables=new CompositeDisposable();
}
@Override
public Request authenticate(Route route, Response response) throws IOException {
request = null;
mApi.refreshUserToken(...)
.subscribeOn(mSchedulerProvider.io())
.observeOn(mSchedulerProvider.ui())
.doOnSubscribe(d -> mDisposables.add(d))
.subscribe(tokenResponse -> {
if(tokenResponse.isSuccessful()) {
saveUserToken(tokenResponse.body());
request = response.request().newBuilder()
.header("Authorization", getUserAccessToken())
.build();
} else {
logoutUser();
}
},error -> {
},() -> {});
mDisposables.clear();
stop();
return request;
}
我的logcat:
Error:(55, 16) error: Found a dependency cycle:
com.yasinkacmaz.myapp.service.APIService is injected at com.yasinkacmaz.myapp.darkvane.modules.NetworkModule.provideTokenAuthenticator(…, mApi, …)
com.yasinkacmaz.myapp.service.token.TokenAuthenticator is injected at
com.yasinkacmaz.myapp.darkvane.modules.NetworkModule.provideOkHttpClient(…, tokenAuthenticator, …)
okhttp3.OkHttpClient is injected at
com.yasinkacmaz.myapp.darkvane.modules.NetworkModule.provideRetrofit(…, okHttpClient)
retrofit2.Retrofit is injected at
com.yasinkacmaz.myapp.darkvane.modules.NetworkModule.provideAPI(retrofit)
com.yasinkacmaz.myapp.service.APIService is provided at
com.yasinkacmaz.myapp.darkvane.components.ApplicationComponent.exposeAPI()
所以我的问题是:我的TokenAuthenticator
课程取决于APIService
但我需要TokenAuthenticator
在创作时提供APIService
.这会导致依赖循环错误.我怎么打败这个,是否有人面临这个问题?提前致谢.
1> David Rawson..:
你的问题是:
你的OKHttpClient取决于你的身份验证器
您的身份验证器依赖于改造服务
改造取决于OKHttpClient(如第1点所述)
因此循环依赖.
这里的一个可能的解决方案是你TokenAuthenticator
依赖于 APIServiceHolder
而不是APIService
.然后,无论是否已经实例化(对象图下方),都TokenAuthenticator
可以在配置时将其作为依赖项提供.OKHttpClient
APIService
一个非常简单的APIServiceHolder:
public class APIServiceHolder {
private APIService apiService;
@Nullable
APIService apiService() {
return apiService;
}
void setAPIService(APIService apiService) {
this.apiService = apiService;
}
}
然后重构你的TokenAuthenticator:
@Inject
public TokenAuthenticator(@NonNull APIServiceHolder apiServiceHolder, @NonNull ImmediateSchedulerProvider schedulerProvider) {
this.apiServiceHolder = apiServiceHolder;
this.schedulerProvider = schedulerProvider;
this.disposables = new CompositeDisposable();
}
@Override
public Request authenticate(Route route, Response response) throws IOException {
if (apiServiceHolder.get() == null) {
//we cannot answer the challenge as no token service is available
return null //as per contract of Retrofit Authenticator interface for when unable to contest a challenge
}
request = null;
TokenResponse tokenRespOnse= apiServiceHolder.get().blockingGet()
if (tokenResponse.isSuccessful()) {
saveUserToken(tokenResponse.body());
request = response.request().newBuilder()
.header("Authorization", getUserAccessToken())
.build();
} else {
logoutUser();
}
return request;
}
请注意,检索令牌的代码应该是同步的.这是合同的一部分Authenticator
.里面的代码Authenticator
将运行关闭主线程.
当然,您需要编写@Provides
相同的方法:
@Provides
@ApplicationScope
apiServiceHolder() {
return new APIServiceHolder();
}
并重构提供者方法:
@Provides
@ApplicationScope
APIService provideAPI(Retrofit retrofit, APIServiceHolder apiServiceHolder) {
APIService apiService = retrofit.create(APIService.class);
apiServiceHolder.setAPIService(apiService);
return apiService;
}
请注意,可变全局状态通常不是一个好主意.但是,如果您的包装井井有条,您可以适当地使用访问修改器以避免持有者的意外使用.
在我的情况下,APIServiceHolder始终返回null。