io.gatling.http.resolver.ShuffleJdkNameResolver.scala Maven / Gradle / Ivy

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/*
 * Copyright 2011-2019 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.net.{ InetAddress, UnknownHostException }
import java.util.{ Arrays => JArrays, Collections => JCollections, List => JList }
import java.util.concurrent.ThreadLocalRandom

import io.netty.resolver.InetNameResolver
import io.netty.util.concurrent.{ ImmediateEventExecutor, Promise }

private[http] class ShuffleJdkNameResolver extends InetNameResolver(ImmediateEventExecutor.INSTANCE) {

  override def doResolve(inetHost: String, promise: Promise[InetAddress]): Unit =
    throw new UnsupportedOperationException

  override def doResolveAll(inetHost: String, promise: Promise[JList[InetAddress]]): Unit =
    try {
      val addresses = InetAddress.getAllByName(inetHost) match {
        case Array(single) => JCollections.singletonList(single)
        case array =>
          val list = JArrays.asList(array: _*)
          JCollections.shuffle(list, ThreadLocalRandom.current)
          list
      }
      promise.setSuccess(addresses)
    } catch {
      case e: UnknownHostException => promise.setFailure(e)
    }
}