Dagger生成多个改装拦截器实例 [英] Dagger generating multiple instances of retrofit interceptor
问题描述
我是Dagger和Retrofit的新手。我有一个问题,尽管在dagger模块中声明了单例,仍在生成多个改装自定义拦截器实例。我只需要一个实例。
I am new to Dagger and Retrofit. I am having issue where multiple instances of retrofit custom interceptor are being generated despite declared singleton in dagger module. I only require one instance.
Dagger模块
@Module
public class ApiModule
{
private Config config;
public ApiModule(Config config) {
this.config = config;
}
@Provides @Singleton
public OkHttpClient.Builder provideOkHttpClient()
{
return new OkHttpClient.Builder();
}
@Provides @Singleton
public AuthenticationRequestInterceptor provideRequestInterceptor()
{
return new AuthenticationRequestInterceptor();
}
@Provides @Singleton
public Retrofit provideRetrofitInstance()
{
HttpLoggingInterceptor logging = new HttpLoggingInterceptor();
// set your desired log level
logging.setLevel(HttpLoggingInterceptor.Level.BODY);
OkHttpClient.Builder httpClient = new OkHttpClient.Builder();
// add session headers interceptor
httpClient.addInterceptor(provideRequestInterceptor());
// add logging as last interceptor
httpClient.addInterceptor(logging);
return new Retrofit.Builder()
.baseUrl(getConfig().getBaseUrl())
.addConverterFactory(GsonConverterFactory.create())
.addCallAdapterFactory(RxJava2CallAdapterFactory.create())
.client(httpClient.build()) //for logging purpose remove later
.build();
}
}
改造拦截器
public class AuthenticationRequestInterceptor implements Interceptor
{
private Map<String, String> defaultHeaders;
public AuthenticationRequestInterceptor()
{
this.defaultHeaders = new HashMap<>();
}
public void setDefaultHeaders(Map<String, String> headers)
{
this.defaultHeaders = headers;
}
@Override
public Response intercept(Chain chain) throws IOException
{
Request request = chain.request();
Request.Builder requestBuilder = request.newBuilder();
for (String key: this.defaultHeaders.keySet())
{
requestBuilder.addHeader(key, this.defaultHeaders.get(key));
}
return chain.proceed(requestBuilder.build());
}
}
连接器
public class Connect
{
@Inject Retrofit retrofit;
@Inject Config config;
@Inject AuthenticationRequestInterceptor headerInterceptor;
public Connect(PercentApp application)
{
((PercentApp) application).getComponent().inject(this);
/ **在此处设置拦截器标头,但这会在不同的
实例,而不是后来在postUser中调用的实例** /
/** Setting interceptor headers here, but this get sets in a different instances than the one gets called later in postUser **/
headerInterceptor.setDefaultHeaders(generateDefaultAuthHeaders());
}
public void postUser(Observer observer, User user)
{
if(retrofit != null)
{
ApiServices api = retrofit.create(ApiServices.class);
Observable<HashMap> observable = api.postUser("{post something}");
observable.
subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(observer);
}
}
}
我的应用程序我创建了Dagger的实例,例如:
And in my Application I create instance of Dagger like this:
DaggerApplicationComponent.builder()
.applicationModule(new ApplicationModule(this))
.apiModule(new ApiModule(new Config(environment)))
.build();
然后在MainActivity中创建Connect实例
And in my MainActivity I create instance of Connect
Connect connect = new Connect((MyApp) getApplication());
User user = new User();
connect.postUser(new UserObserver(this), user);
现在的问题是AuthenticationRequestInterceptor构造函数被调用了两次,但我不这样做了解为什么以及为什么,我设置的标头将设置为另一个Interceptor实例。请帮忙。谢谢
Now the problem is that AuthenticationRequestInterceptor contructor gets called twice which I don't understand why and because of that the headers that I set get sets to a different instance of Interceptor. Please help. Thanks
推荐答案
您不应致电 provideRequestInterceptor
直接
@Provides @Singleton
public Retrofit provideRetrofitInstance(AuthenticationRequestInterceptor authInterceptor)
{
HttpLoggingInterceptor logging = new HttpLoggingInterceptor();
// set your desired log level
logging.setLevel(HttpLoggingInterceptor.Level.BODY);
OkHttpClient.Builder httpClient = new OkHttpClient.Builder();
// add session headers interceptor
httpClient.addInterceptor(authInterceptor);
// add logging as last interceptor
httpClient.addInterceptor(logging);
return new Retrofit.Builder()
.baseUrl(getConfig().getBaseUrl())
.addConverterFactory(GsonConverterFactory.create())
.addCallAdapterFactory(RxJava2CallAdapterFactory.create())
.client(httpClient.build()) //for logging purpose remove later
.build();
}
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