添加侦听器并使用Dagger2注入侦听器后，改装服务始终为空
添加侦听器并使用Dagger2注入侦听器后，改装服务始终为空
提问于 2019-04-09 15:58:50
我有一个像这样的重新登录改造服务
interface TokenService {
@GET("re-login")
fun relogin(): Call<ReloginResponse>
}然后我有一个NetModule，其中所有的依赖项都是这样注入的
@Module
class NetModule(baseUrl: String) {
var baseUrl = baseUrl
@Provides
@Singleton
fun provideGson(): Gson {
val gsonBuilder = GsonBuilder()
gsonBuilder.setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
return gsonBuilder.create()
}
@Provides
@Singleton
fun provideOkhttp(tokenInterceptor: TokenInterceptor): OkHttpClient {
val logging = HttpLoggingInterceptor()
logging.setLevel(HttpLoggingInterceptor.Level.BODY)
val client = OkHttpClient.Builder()
// .authenticator(tokenAutheticator)
.connectTimeout(60, TimeUnit.SECONDS)
.writeTimeout(60, TimeUnit.SECONDS)
.readTimeout(60, TimeUnit.SECONDS)
.addInterceptor(logging)
.addInterceptor(tokenInterceptor)
.build()
return client
}
@Provides
@Singleton
fun provideRetrofit(gson: Gson, okHttpClient: OkHttpClient): Retrofit {
return Retrofit.Builder().addConverterFactory(GsonConverterFactory.create(gson))
.addCallAdapterFactory(RxJava2CallAdapterFactory.create())
.baseUrl(baseUrl)
.client(okHttpClient)
.build()
}
@Provides
@Singleton
fun provideTokenHoler():TokenHolder{
return TokenHolder()
}
@Provides
@Singleton
fun provideTokenService(retrofit: Retrofit,tokenHolder: TokenHolder):TokenService{
val tokenService = retrofit.create(TokenService::class.java)
tokenHolder.tokenService = tokenService
return tokenService
}
}那么TokenHolder类是这样的
class TokenHolder {
var tokenService:TokenService?=null
get() = field
set(value) {field=value}
}这就是我在TokenService部件中获取null的TokenInterceptor类。
@Singleton
class TokenInterceptor @Inject constructor(private val tokenHolder: TokenHolder) :Interceptor{
var token:String=""
override fun intercept(chain: Interceptor.Chain): Response {
val original = chain.request()
val originalHttpUrl = original.url()
val url = originalHttpUrl.newBuilder()
.addQueryParameter("token", token)
.build()
// Request customization: add request headers
val requestBuilder = original.newBuilder()
.url(url)
val request = requestBuilder.build()
val response = chain.proceed(request)
if(response.code()==401){
val newToken = tokenHolder.tokenService?.relogin()?.execute()?.body()?.token
val url1 = originalHttpUrl.newBuilder()
.addQueryParameter("token", newToken)
.build()
println("########## new new token ########## "+newToken)//this is null
// Request customization: add request headers
val requestBuilder1 = original.newBuilder()
.url(url1)
val request1 = requestBuilder1.build()
val response1 = chain.proceed(request1)
return response1
}
return chain.proceed(request)
}
}我试图在得到401响应后点击重新登录，但我总是得到TokenService null。我应该如何提供依赖关系？任何帮助都将不胜感激。谢谢
回答 1
Stack Overflow用户
回答已采纳
发布于 2019-04-09 16:50:16
据我所知，TokenHolder有TokenService的空实例，因为没有办法将它传递到那里。您正在通过Dagger创建TokenService实例并将其传递给TokenHolder，但它与您在拦截器中获取的实例不同。你应该颠倒你的依赖关系。将模块方法更新为this，并告诉我它是否可以工作。
@Provides
@Singleton
fun provideTokenHolder(service:TokenService): TokenHolder{
return TokenHolder(service)
}
@Provides
@Singleton
fun provideTokenService(retrofit: Retrofit): TokenService{
return retrofit.create(TokenService::class.java)
}作为null的TokenService应该不会发生，所以你应该像下面这样声明TokenHolder。
class TokenHolder(val service: TokenService)此外，为了打破你的依赖循环。您必须更改TokenInterceptor声明。
class TokenInterceptor @Inject constructor(private val tokenHolder: Lazy<TokenHolder>) : Interceptor用Dagger.Lazy包装TokenHolder，它应该可以完成工作。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/55587788
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