什麼是「〜」符號標註，當我們在斯卡拉REST服務定義pathPrefix？

Question

pathPrefix("ball") { 
pathEnd { 
    complete("/ball") 
} ~ 
    path(IntNumber) { int => 
    complete(if (int % 2 == 0) "even ball" else "odd ball") 
    } 
} 

什麼是「〜」標誌表明這裏

Answer 1

我假設你指的是~方法對噴射/阿卡-HTTP。它所做的是鏈上的兩個路由一起：

/** 
* Returns a Route that chains two Routes. If the first Route rejects the request the second route is given a 
* chance to act upon the request. 
*/ 
def ~(other: Route): Route = { ctx ⇒ 
    route { 
    ctx.withRejectionHandling { rejections ⇒ 
     other(ctx.withRejectionsMapped(rejections ++ _)) 
    } 
    } 

噴霧，一個Route是一個函數取一個RequestContext和返回Unit一個類型別名：

type Route = RequestContext ⇒ Unit 

而且在阿卡-HTTP，它返回Future[RouteResult]：

type Route = RequestContext => Future[RouteResult]