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LiveDataCallAdapter.java
/* * Copyright (C) 2017 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.android.example.github.util; import com.android.example.github.api.ApiResponse; import android.arch.lifecycle.LiveData; import java.lang.reflect.Type; import java.util.concurrent.atomic.AtomicBoolean; import retrofit2.Call; import retrofit2.CallAdapter; import retrofit2.Callback; import retrofit2.Response; /** * A Retrofit adapterthat converts the Call into a LiveData of ApiResponse. * @param
*/ public class LiveDataCallAdapter
implements CallAdapter
>> { private final Type responseType; public LiveDataCallAdapter(Type responseType) { this.responseType = responseType; } @Override public Type responseType() { return responseType; } @Override public LiveData
> adapt(Call
call) { return new LiveData
>() { AtomicBoolean started = new AtomicBoolean(false); @Override protected void onActive() { super.onActive(); if (started.compareAndSet(false, true)) { call.enqueue(new Callback
() { @Override public void onResponse(Call
call, Response
response) { postValue(new ApiResponse<>(response)); } @Override public void onFailure(Call
call, Throwable throwable) { postValue(new ApiResponse
(throwable)); } }); } } }; } }