Akka/Scala example source code file (LeveldbKey.scala)

This example Akka source code file (LeveldbKey.scala) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Akka and Scala source code examples by using tags.

All credit for the original source code belongs to akka.io; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Akka tags/keywords

array, boolean, int, key, long

The LeveldbKey.scala Akka example source code

/**
 * Copyright (C) 2009-2014 Typesafe Inc. <http://www.typesafe.com>
 * Copyright (C) 2012-2013 Eligotech BV.
 */

package akka.persistence.journal.leveldb

import java.nio.ByteBuffer

/**
 * LevelDB key.
 */
private[leveldb] final case class Key(
  persistenceId: Int,
  sequenceNr: Long,
  channelId: Int)

private[leveldb] object Key {
  def keyToBytes(key: Key): Array[Byte] = {
    val bb = ByteBuffer.allocate(20)
    bb.putInt(key.persistenceId)
    bb.putLong(key.sequenceNr)
    bb.putInt(key.channelId)
    bb.array
  }

  def keyFromBytes(bytes: Array[Byte]): Key = {
    val bb = ByteBuffer.wrap(bytes)
    val aid = bb.getInt
    val snr = bb.getLong
    val cid = bb.getInt
    new Key(aid, snr, cid)
  }

  def counterKey(persistenceId: Int): Key = Key(persistenceId, 0L, 0)
  def counterToBytes(ctr: Long): Array[Byte] = ByteBuffer.allocate(8).putLong(ctr).array
  def counterFromBytes(bytes: Array[Byte]): Long = ByteBuffer.wrap(bytes).getLong

  def id(key: Key) = key.channelId
  def idKey(id: Int) = Key(1, 0L, id)
  def isIdKey(key: Key): Boolean = key.persistenceId == 1

  def deletionKey(persistenceId: Int, sequenceNr: Long): Key = Key(persistenceId, sequenceNr, 1)
  def isDeletionKey(key: Key): Boolean = key.channelId == 1
}