com.signalcollect.messaging.DefaultVertexToWorkerMapper.scala Maven / Gradle / Ivy

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A framework for parallel and distributed graph processing.

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/*
 *  @author Philip Stutz
 *
 *  Copyright 2010 University of Zurich
 *
 *  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 com.signalcollect.messaging

import com.signalcollect.interfaces.VertexToWorkerMapper

class DefaultVertexToWorkerMapper[Id](numberOfNodes: Int, workersPerNode: Int) extends VertexToWorkerMapper[Id] with Serializable {

  val numberOfWorkers = numberOfNodes * workersPerNode

  @inline final def getWorkerIdForVertexId(vertexId: Id): Int = {
    (vertexId.hashCode & Int.MaxValue) % numberOfWorkers
  }

  //  def getWorkerIdForVertexIdHash(vertexIdHash: Int): Int = (vertexIdHash % numberOfWorkers).abs (BAD PERFORMANCE!)
  @inline final def getWorkerIdForVertexIdHash(vertexIdHash: Int): Int = {
    (vertexIdHash & Int.MaxValue) % numberOfWorkers
  }
}