您好我正在尝试使用flatmap创建一系列网络请求,但不太了解如何执行此操作的过程。
目标是这样做:
做networkRequest 1 一旦我从networkRequestOne得到一个结果,在该结果上做一些逻辑,然后执行下一个networkRequestTwo并调用onSuccess,并返回来自networkRequestTwo的响应值。
当前代码:
delegator.requestOne(requestData)
.flatMap ({ response ->
if(response.isSuccessful){
cookieStorage.saveSessionCookies(response.header(cookieStorage.COOKIE_HEADER_NAME)!!)
}
return delegator.requestTwo
})
.observeOn(AndroidSchedulers.mainThread())
.subscribeOn(Schedulers.io())
.subscribe(object : SingleObserver<ResponseTwo>() {
@Override
fun onSubscribe(Disposable d) {
}
@Override
fun onSuccess(responseTwo :ResponseTwo) {
callback.onSuccess(responseTwo)
}
@Override
public void onError(Throwable e) {
}
});
delegator.requestOne和delegator.requestTwo都连接到一个返回单个可观察的改进调用
答案 0 :(得分:2)
您需要在subscribe
方法中调用回调,这有点奇怪。如果您已经 Rx ,为什么还需要 cb ?如果您返回Single
并运行您实际订阅的回调代码,则会更清楚:
...
// don't forget to handle the `disposable`
doSmth(requestData)
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(
{ success -> /* here's your success callback code */},
{ error -> /* handle error here */}
)
...
fun doSmth(requestData: RequestData): Single<ResponseTwo> = delegator.requestOne(requestData)
.doOnSuccess(::updateCookies)
// you can extract the data you need from the first request using `it`
.flatMap { delegator.requestTwo() }
fun updateCookies(response: Response<ResponseOne>) {
val cookie = response.header(cookieStorage.COOKIE_HEADER_NAME)!!
cookieStorage.saveSessionCookies(cookie)
}
<强>更新强>
如果您仍然需要callback
:
// don't forget to handle the `disposable`
delegator.requestOne(requestData)
.doOnSuccess(::updateCookies)
.flatMap { delegator.requestTwo() }
.observeOn(AndroidSchedulers.mainThread())
.subscribeOn(Schedulers.io())
.subscribe(
{ success -> callback.onSuccess(success) },
{ error -> callback.onError(error) }
)
fun updateCookies(response: Response<ResponseOne>) {
if (response.isSuccessful) {
val cookie = response.header(cookieStorage.COOKIE_HEADER_NAME)!!
cookieStorage.saveSessionCookies(cookie)
}
}