core/src/main/scala/org/apache/gearpump/partitioner/BroadcastPartitioner.scala

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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 org.apache.gearpump.partitioner

import org.apache.gearpump.Message

/** Used by storm module to broadcast message to all downstream tasks  */
class BroadcastPartitioner extends MulticastPartitioner {
  private var lastPartitionNum = -1
  private var partitions = Array.empty[Int]

  override def getPartitions(
      msg: Message, partitionNum: Int, currentPartitionId: Int): Array[Int] = {
    if (partitionNum != lastPartitionNum) {
      partitions = (0 until partitionNum).toArray
      lastPartitionNum = partitionNum
    }
    partitions
  }
}