[英]send Kotlin suspend method as parameter
這是我在retrofit界面中的function
@POST("/api/Auth/login")
suspend fun patientLogin(@Body loginReq: LoginRequest): Response<BaseResponse<User>>
我需要將此 patientLogin(data) 方法作為參數發送到另一個方法中,該方法應該是一個通用方法,它將在 IO scope 中調用此方法,並將返回帶有偵聽器(接口)的響應。 唯一的問題是我不確定如何將此方法本身作為參數發送。 謝謝
// One cannot return caculcated value from a coroutine, only the job
fun <T, R> CoroutineScope.functionName(block: suspend (T) -> R): Job = launch(Dispatchers.IO) {
block() //provide T either as another parameter to this function or if this function belongs to a class you take it from a class' state
}
// One can return a deferred value and wait for the actual R value to be calculated
fun <T, R> CoroutineScope.functionName(block: suspend (T) -> R): Deferred<R> = async(Dispatchers.IO) {
block()
}
// Will execute on the inherited dispatcher from the coroutine that executes this function
suspend fun <T, R> functionName(block: suspend (T) -> R): R = coroutineScope {
block()
}
// Always executes on the IO dispatcher
suspend fun <T, R> functionName(block: suspend (T) -> R): R = withContext(Dispatchers.IO) {
block()
}
所以最后我能夠做我想做的事,我只是想我也應該發布答案,這可能對其他人有幫助。 感謝所有回答我問題的貢獻者。
fun <T : Any> callBaseApi(call: suspend () -> Response<BaseResponse<T>>, apiCallback: ApiCallback<T>) {
CoroutineScope(Dispatchers.IO).launch {
try {
val response = call.invoke()
withContext(Dispatchers.Main) {
if (response.isSuccessful) {
apiCallback.onSuccess(
response.body()?.data,
response.body()?.message,
response.body()?.status!!
)
} else {
apiCallback.onFailure(response.message(), response.code())
Log.e("makeApiCall: ", response.errorBody().toString())
}
}
}catch (e:Exception){
withContext(Dispatchers.Main) {
apiCallback.onFailure(e.message, -1)
}
}
}
}
並調用此方法
callBaseApi({WebServicesHandler.getWebServices(CacheManager.getCurrentUser()!!.token!!)
.editPatientPersonalInfo(data)}, apiCallback)
我只是遇到了同樣的問題,您在參數定義中的“暫停”對我有所幫助。
有人可以通過這個例子找到一些清晰度:
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.withContext
class Worker {
fun doWork() {
println("Start work")
Thread.sleep(1000)
println("End work")
}
suspend fun doWorkSuspend() = withContext(Dispatchers.Default) {
println("Start work suspended")
Thread.sleep(1000)
println("End work suspended")
}
}
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.Job
import kotlinx.coroutines.launch
class Controller {
private val scope = CoroutineScope(Dispatchers.Default)
private val startedJobs = mutableListOf<Job>()
fun launchWork(perform: () -> Unit) {
perform()
}
fun launchWorkSuspended(perform: suspend() -> Unit) {
val job = scope.launch {
perform()
}
startedJobs.add(job)
}
}
fun main(args: Array<String>) {
val controller = Controller()
val worker = Worker()
controller.launchWork { worker.doWork() } // fine
controller.launchWorkSuspended { worker.doWork() } // fine
controller.launchWorkSuspended { worker.doWorkSuspend() } // fine
}
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