如何使用Scarlet在Android上通过WebSocket连接？

Question

README.md中的代码

 val scarletInstance = Scarlet.Builder()
    .webSocketFactory(okHttpClient.newWebSocketFactory(GDAX_URL))
    .addMessageAdapterFactory(MoshiMessageAdapter.Factory())
    .addStreamAdapterFactory(RxJava2StreamAdapterFactory())
    .build() 

版本和依赖项：

implementation 'com.tinder.scarlet:scarlet:0.1.8'
implementation "com.github.tinder.scarlet:scarlet-websocket-okhttp:0.1.7"
implementation "com.github.tinder.scarlet:scarlet-stream-adapter-rxjava2:0.2.4"
implementation "com.github.tinder.scarlet:scarlet-message-adapter-moshi:0.2.4"
implementation "com.github.tinder.scarlet:scarlet-lifecycle-android:0.2.4"

Answer 1

首先，您应该使用接口声明一个 WebSocket 客户端。使用 Scarlet 注释（例如@Receive和 ）@Send来定义您将如何处理 WebSocket 通信，如下例所示：

interface NewsService {
    @Receive
    fun observeWebSocketEvent(): Flowable<WebSocket.Event>
    @Send
    fun sendSubscribe(subscribe: Subscribe)
    @Receive
    fun observeNews(): Flowable<MyNews>
}  

下一步是创建 Scarlet 接口的实现并订阅 WebSocket 连接期间发出的数据流。在下面的示例中，使用了 Moshi 和 RxJava，但是 Scarlet 提供了其他方法来处理和操作数据。

val scarletInstance = Scarlet.Builder()
    .webSocketFactory(okHttpClient.newWebSocketFactory(BASE_URL))
    .addMessageAdapterFactory(MoshiMessageAdapter.Factory())
    .addStreamAdapterFactory(RxJava2StreamAdapter.Factory())
    .build()

//service created
val newsService = scarletInstance.create<NewsService>()

//define websocket event observer
newsService.observeWebSocketEvent()
    .filter { it is WebSocket.Event.OnConnectionOpened<*> }
    .subscribe({
        newsService.sendSubscribe()
    })

// news data result
newsService.observeNews()
    .subscribe({ news ->
        Log.d(TAG, news.toString())
    })