假设您正在使用以下示例中的缓存：https://doc.akka.io/docs/akka-http/current/common/caching.html。

import akka.http.caching.scaladsl.Cache
import akka.http.caching.scaladsl.CachingSettings
import akka.http.caching.LfuCache
import akka.http.scaladsl.server.RequestContext
import akka.http.scaladsl.server.RouteResult
import akka.http.scaladsl.model.Uri
import akka.http.scaladsl.server.directives.CachingDirectives._
import scala.concurrent.duration._

// Use the request's URI as the cache's key
val keyerFunction: PartialFunction[RequestContext,Uri] = {
  case r: RequestContext => r.request.uri
}
val defaultCachingSettings = CachingSettings(system)
val lfuCacheSettings =
  defaultCachingSettings.lfuCacheSettings
    .withInitialCapacity(25)
    .withMaxCapacity(50)
    .withTimeToLive(20.seconds)
    .withTimeToIdle(10.seconds)
val cachingSettings =
  defaultCachingSettings.withLfuCacheSettings(lfuCacheSettings)
val lfuCache: Cache[Uri,RouteResult] = LfuCache(cachingSettings)

// Create the route
val route = cache(lfuCache,keyerFunction)(innerRoute)

您的后台任务应安排为更新lfuCache。您可以使用以下缓存类的接口：https://doc.akka.io/api/akka-http/10.1.10/akka/http/caching/scaladsl/Cache.html。

感兴趣的方法：

 abstract def get(key: K): Option[Future[V]]
 // Retrieves the future instance that is currently in the cache for the given key.

 abstract def getOrLoad(key: K,loadValue: (K) ⇒ Future[V]): Future[V]
 // Returns either the cached Future for the given key,// or applies the given value loading function on the key,producing a Future[V].

 abstract def put(key: K,mayBeValue: Future[V])
                 (implicit ex: ExecutionContext): Future[V]
 // Cache the given future if not cached previously.

这是您可以使用的Scheduler界面：

https://doc.akka.io/docs/akka/current/scheduler.html

val cancellable =
  system.scheduler.schedule(0 milliseconds,5 seconds,...)

您的调度程序将每n秒调用lfuCache.put(...)并更新缓存。

接下来，您的代码可以遵循以下一种模式：

1. 使用已缓存的路由，因为您已经在执行以下操作： val route = cache(lfuCache,keyerFunction)(...。
2. 或者直接调用lfuCache.get(key)或lfuCache.getOrLoad(...)而不使用高速缓存的dsl指令（不使用cache(lfuCache,...）。

如果直接将Cache类用于放置和检索值，请考虑使用更简单的键代替URI值。