/*
 * 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.texera.amber.engine.architecture.common

import org.apache.texera.amber.core.virtualidentity.ChannelIdentity
import org.apache.texera.amber.engine.architecture.common.ProcessingStepCursor.INIT_STEP

object ProcessingStepCursor {
  // step value before processing any incoming message
  // processing first message will have step = 0
  val INIT_STEP: Long = -1L
}

class ProcessingStepCursor {
  private var currentStepCounter: Long = INIT_STEP
  private var currentChannel: ChannelIdentity = _

  def setCurrentChannel(channelId: ChannelIdentity): Unit = {
    currentChannel = channelId
  }

  def getStep: Long = currentStepCounter

  def getChannel: ChannelIdentity = currentChannel

  def stepIncrement(): Unit = {
    currentStepCounter += 1
  }

}
