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December 4, 2018 21:01
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package com.carium.myhealth.data.network | |
import kotlinx.coroutines.CompletableDeferred | |
import kotlinx.coroutines.Deferred | |
import retrofit2.* | |
import java.lang.reflect.ParameterizedType | |
import java.lang.reflect.Type | |
class DeferredCallAdapterFactory private constructor() : CallAdapter.Factory() { | |
companion object { | |
@JvmStatic | |
@JvmName("create") | |
operator fun invoke() = DeferredCallAdapterFactory() | |
} | |
override fun get( | |
returnType: Type, | |
annotations: Array<out Annotation>, | |
retrofit: Retrofit | |
): CallAdapter<*, *>? { | |
if (Deferred::class.java != getRawType(returnType)) { | |
return null | |
} | |
if (returnType !is ParameterizedType) { | |
throw IllegalStateException( | |
"Deferred return type must be parameterized as Deferred<Foo> or Deferred<out Foo>") | |
} | |
val responseType = getParameterUpperBound(0, returnType) | |
if (returnType.actualTypeArguments.size > 0 && returnType.actualTypeArguments[0] == Unit::class.java) { | |
return UnitCallAdapter<Unit>(responseType) | |
} | |
val rawDeferredType = getRawType(responseType) | |
return if (rawDeferredType == Response::class.java) { | |
if (responseType !is ParameterizedType) { | |
throw IllegalStateException( | |
"Response must be parameterized as Response<Foo> or Response<out Foo>") | |
} | |
ResponseCallAdapter<Any>(getParameterUpperBound(0, responseType)) | |
} else { | |
BodyCallAdapter<Any>(responseType) | |
} | |
} | |
private class BodyCallAdapter<T>( | |
private val responseType: Type | |
) : CallAdapter<T, Deferred<T>> { | |
override fun responseType() = responseType | |
override fun adapt(call: Call<T>): Deferred<T> { | |
val deferred = CompletableDeferred<T>() | |
deferred.invokeOnCompletion { | |
if (deferred.isCancelled) { | |
call.cancel() | |
} | |
} | |
call.enqueue(object : Callback<T> { | |
override fun onFailure(call: Call<T>, t: Throwable) { | |
deferred.completeExceptionally(t) | |
} | |
override fun onResponse(call: Call<T>, response: Response<T>) { | |
if (response.isSuccessful) { | |
deferred.complete(response.body()!!) | |
} else { | |
deferred.completeExceptionally(HttpException(response)) | |
} | |
} | |
}) | |
return deferred | |
} | |
} | |
private class UnitCallAdapter<Unit>(private val responseType: Type) : CallAdapter<Unit, Deferred<Any?>> { | |
override fun responseType() = responseType | |
override fun adapt(call: Call<Unit>): Deferred<Any?> { | |
val deferred = CompletableDeferred<Any?>() | |
deferred.invokeOnCompletion { | |
if (deferred.isCancelled) { | |
call.cancel() | |
} | |
} | |
call.enqueue(object : Callback<Unit> { | |
override fun onFailure(call: Call<Unit>, t: Throwable) { | |
deferred.completeExceptionally(t) | |
} | |
override fun onResponse(call: Call<Unit>, response: Response<Unit>) { | |
if (response.isSuccessful) { | |
deferred.complete(null) | |
} else { | |
deferred.completeExceptionally(HttpException(response)) | |
} | |
} | |
}) | |
return deferred | |
} | |
} | |
private class ResponseCallAdapter<T>( | |
private val responseType: Type | |
) : CallAdapter<T, Deferred<Response<T>>> { | |
override fun responseType() = responseType | |
override fun adapt(call: Call<T>): Deferred<Response<T>> { | |
val deferred = CompletableDeferred<Response<T>>() | |
deferred.invokeOnCompletion { | |
if (deferred.isCancelled) { | |
call.cancel() | |
} | |
} | |
call.enqueue(object : Callback<T> { | |
override fun onFailure(call: Call<T>, t: Throwable) { | |
deferred.completeExceptionally(t) | |
} | |
override fun onResponse(call: Call<T>, response: Response<T>) { | |
deferred.complete(response) | |
} | |
}) | |
return deferred | |
} | |
} | |
} |
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