com.johnsnowlabs.util.spark.LongMapAccumulator.scala Maven / Gradle / Ivy

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/*
 * Copyright 2017-2022 John Snow Labs
 *
 * 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.johnsnowlabs.util.spark

import org.apache.spark.util.AccumulatorV2

import scala.collection.mutable.{Map => MMap}

class LongMapAccumulator(defaultMap: MMap[String, Long] = MMap.empty[String, Long])
    extends AccumulatorV2[(String, Long), Map[String, Long]] {

  private var mmap = defaultMap

  override def reset(): Unit = mmap.clear()

  override def add(v: (String, Long)): Unit = mmap(v._1) += v._2

  override def value: Map[String, Long] = mmap.toMap

  override def copy(): AccumulatorV2[(String, Long), Map[String, Long]] = {
    val c = new LongMapAccumulator(MMap[String, Long](value.toSeq: _*))
    c.mmap = this.mmap
    c
  }

  override def isZero: Boolean = mmap.isEmpty

  override def merge(other: AccumulatorV2[(String, Long), Map[String, Long]]): Unit =
    mmap = mmap ++ other.value
}