com.intel.analytics.zoo.feature.pmem.NativeVarLenArray.scala Maven / Gradle / Ivy

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/*
 * Copyright 2018 Analytics Zoo Authors.
 *
 * 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.intel.analytics.zoo.feature.pmem

import org.apache.spark.unsafe.Platform

import scala.reflect.ClassTag

private[zoo] abstract class NativeVarLenArray[T: ClassTag](val recordNum: Int,
    totalSizeByBytes: Long,
    memoryType: MemoryType, protected val moveStep: Int) extends
  NativeArray[Array[T]](totalSizeByBytes, memoryType) {

  // TODO: maybe this can be changed to native long array
  val indexer = Array.fill[Long](recordNum + 1)(-1L)

  indexer(0) = startAddr

  protected def isValidIndex(i: Int): Boolean = {
    i < recordNum && indexer(i + 1) != -1
  }

  protected def getRecordLength(i: Int): Int = {
    assert(isValidIndex(i), s"Invalid index: ${i}")
    ((indexer(i + 1) - indexer(i)) >> moveStep).toInt
  }

  protected def getTypeOffSet(): Int

  def get(i: Int): Array[T] = {
    assert(isValidIndex(i), s"Invalid index ${i}")
    val recordLen = getRecordLength(i)
    val result = new Array[T](recordLen)
    Platform.copyMemory(null, indexOf(i), result,
      getTypeOffSet(), (recordLen << moveStep))
    return result
  }

  // TODO: would be slow if we put item one by one.
  def set(i: Int, ts: Array[T]): Unit = {
    assert(!deleted)
    val curOffSet = indexer(i)
    assert(curOffSet != -1, s"Invalid index: ${i}")
    var j = 0
    while (j < ts.length) {
      putSingle(curOffSet + (j << moveStep), ts(j))
      j += 1
    }
    indexer(i + 1) = curOffSet + (ts.length << moveStep)
  }

  def putSingle(offset: Long, s: T): Unit

  def indexOf(i: Int): Long = {
    assert(isValidIndex(i), s"Invalid index: ${i}")
    return indexer(i)
  }
}