com.metamx.tranquility.beam.RoundRobinBeam.scala Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of tranquility-core_2.11 Show documentation

tranquility-core

The newest version!

/*
 * Licensed to Metamarkets Group Inc. (Metamarkets) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  Metamarkets licenses this file
 * to you 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 com.metamx.tranquility.beam

import com.metamx.common.scala.Logging
import com.twitter.util.Future
import java.util.concurrent.atomic.AtomicInteger

/**
  * Farms out events to various beams, round-robin.
  */
class RoundRobinBeam[A](
  beams: IndexedSeq[Beam[A]]
) extends Beam[A] with Logging
{
  private[this] val n = new AtomicInteger(-1)

  override def sendAll(events: Seq[A]): Seq[Future[SendResult]] = {
    beams(n.incrementAndGet() % beams.size).sendAll(events)
  }

  override def close() = {
    Future.collect(beams map (_.close())) map (_ => ())
  }

  override def toString = "RoundRobinBeam(%s)" format beams.mkString(", ")
}