io.gatling.http.resolver.ShufflingNameResolver.scala Maven / Gradle / Ivy
/*
* Copyright 2011-2023 GatlingCorp (https://gatling.io)
*
* 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 io.gatling.http.resolver
import java.{ util => ju }
import java.net.InetAddress
import io.gatling.http.client.HttpListener
import io.gatling.http.client.resolver.InetAddressNameResolver
import io.gatling.http.util.{ InetAddresses, Lists }
import io.netty.channel.EventLoop
import io.netty.util.NetUtil
import io.netty.util.concurrent.{ Future, Promise }
private[http] class ShufflingNameResolver(wrapped: InetAddressNameResolver, eventLoop: EventLoop) extends InetAddressNameResolver {
// no need for a CHM as will always be called from the v.u.'s EventLoop
private val cache = new ju.HashMap[String, ju.List[InetAddress]](3)
override def resolveAll(inetHost: String, promise: Promise[ju.List[InetAddress]], listener: HttpListener): Future[ju.List[InetAddress]] = {
wrapped
.resolveAll(inetHost, eventLoop.newPromise[ju.List[InetAddress]], listener)
.addListener((future: Future[ju.List[InetAddress]]) =>
if (future.isSuccess) {
val rawAddresses = future.getNow
if (rawAddresses.size == 1) {
// don't bother checking equality or shuffling, directly clear cache and return
if (!cache.isEmpty) {
cache.remove(inetHost)
}
promise.setSuccess(rawAddresses)
} else {
val cachedAddresses = cache.get(inetHost)
if (cachedAddresses != null && Lists.isSameSetAssumingNoDuplicate(cachedAddresses, rawAddresses)) {
promise.setSuccess(cachedAddresses)
} else {
val shuffledAddresses = InetAddresses.shuffleInetAddresses(rawAddresses, NetUtil.isIpV4StackPreferred, NetUtil.isIpV6AddressesPreferred)
cache.put(inetHost, shuffledAddresses)
promise.setSuccess(shuffledAddresses)
}
}
} else {
promise.setFailure(future.cause)
}
)
promise
}
override def close(): Unit = wrapped.close()
}