Kotlin 取出来最快的协程数据

package com.example.kotlin_coroutine_channel

import com.google.gson.Gson
import kotlinx.coroutines.*
import kotlinx.coroutines.selects.select
import org.junit.Test
import java.io.File

private val cachePath =
    "H:\\develop\\project\\android\\learn\\kotlin_coroutine_channel\\app\\src\\test\\java\\com\\example\\kotlin_coroutine_channel\\coroutine.cache"
private val cachePath2 =
    "H:\\develop\\project\\android\\learn\\kotlin_coroutine_channel\\app\\src\\test\\java\\com\\example\\kotlin_coroutine_channel\\coroutine2.cache"
private val gson = Gson()


data class User(val name: String, val address: String)

data class Response<T>(val value: T, val isLocal: Boolean)

fun CoroutineScope.getUserFromLocal(name: String) = async(Dispatchers.IO) {
    delay(1000)
    File(cachePath).readText().let { gson.fromJson(it, User::class.java) }
}

fun CoroutineScope.getUserFromLocal2(name: String) = async(Dispatchers.IO) {
    delay(1100)
    File(cachePath2).readText().let { gson.fromJson(it, User::class.java) }

}

class CoroutineText0102 {

    @Test
    fun `test select await`() = runBlocking<Unit> {
        GlobalScope.launch {
            val localRequest = getUserFromLocal("a")
            val localRequest2 = getUserFromLocal2("a")

            val userResponse = select<Response<User>> {
                localRequest.onAwait { Response(it, isLocal = true) }
                localRequest2.onAwait { Response(it, isLocal = false) }
            }
            userResponse.value.let { println(it) }
            userResponse.let { println(it) }
        }.join()

    }
}

coroutine.cache

第一个本地文件

{"name":"Jack","address":"New York"}

coroutine2.cache

{"name":"Jack1","address":"New York"}

第一次运行

让第一个更慢一点那么久返回第二个的结果

非常好用

Kotlin 取出来最快的协程数据

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