[java/kotlin] 콜백함수 비교

콜백함수 처리방법

java:

public interface JavaCallback<T> {
    void onSuccess(T success);
    void onFailure(ApiError error);
}

public void TestCall(@NonNull JavaCallback<ClassName> callback) {
	callback.onSuccess(new ClassName())
    callback.onFailure(new ApiError())
}

사용예는 생략

kotlin example v1:

@Parcelize
data class Result(
    val code: Int,
    val msg: String?
):Parcelable

fun testCall(success: ((result: Result?) -> Unit)?,
             error: ((ApiError)-> Unit)?
) {
    success?.invoke(Result(200, "Test Ok"))
    error?.invoke(ApiError(-1, "error"))
}

testCall (    
    success = {
        addLog(it.toString())
    },
    error = {
        addLog(it.toString())
    })

kotlin example v2:

class KotlinCallback<T> {
    var success: ((T) -> Unit) ?= null
    var error: ((ApiError)-> Unit) ?= null
}

fun testCall(callback: KotlinCallback<Result>) {
    callback.success?.invoke(Result(200, "Test Ok"))
    callback.error?.invoke(ApiError(-1, "error"))
}

testCall(
    KotlinCallback<Result>().apply {
        success = {
            addLog(it.toString())
        }
        error = {
            addLog(it.toString())
        }
    })