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MemoryCache.scala
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MemoryCache.scala
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/*
* Copyright 2014 http4s.org
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.http4s
package server
package staticcontent
import cats.effect.Concurrent
import cats.syntax.functor._
import fs2.Chunk
import fs2.Stream
import java.util.concurrent.ConcurrentHashMap
/** [[CacheStrategy]] that will cache __all__ [[Response]] bodies in local memory
*
* This is useful when serving a very limited amount of static content and want
* to avoid disk access.
*/
class MemoryCache[F[_]] extends CacheStrategy[F] {
private[this] val logger = Platform.loggerFactory.getLogger
private val cacheMap = new ConcurrentHashMap[Uri.Path, Response[F]]()
override def cache(uriPath: Uri.Path, resp: Response[F])(implicit
F: Concurrent[F]
): F[Response[F]] =
if (resp.status == Status.Ok)
Option(cacheMap.get(uriPath)) match {
case Some(r) if r.headers.headers == resp.headers.headers =>
logger.debug(s"Cache hit: $resp").unsafeRunSync()
F.pure(r)
case _ =>
logger.debug(s"Cache miss: $resp").unsafeRunSync()
collectResource(uriPath, resp) /* otherwise cache the response */
}
else F.pure(resp)
// //////////// private methods //////////////////////////////////////////////
private def collectResource(path: Uri.Path, resp: Response[F])(implicit
F: Concurrent[F]
): F[Response[F]] =
resp
.as[Chunk[Byte]]
.map { chunk =>
val newResponse: Response[F] = resp.copy(body = Stream.chunk(chunk))
cacheMap.put(path, newResponse)
newResponse
}
}
object MemoryCache {
def apply[F[_]](): MemoryCache[F] = new MemoryCache[F]
}