com.datamountaineer.streamreactor.connect.mqtt.sink.MqttSinkTask.scala Maven / Gradle / Ivy

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/*
 * Copyright 2017 Datamountaineer.
 *
 * 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.datamountaineer.streamreactor.connect.mqtt.sink

import java.util

import com.datamountaineer.streamreactor.connect.errors.ErrorPolicyEnum
import com.datamountaineer.streamreactor.connect.mqtt.config.{MqttConfigConstants, MqttSinkConfig, MqttSinkSettings}
import com.datamountaineer.streamreactor.connect.utils.ProgressCounter
import com.typesafe.scalalogging.slf4j.StrictLogging
import org.apache.kafka.clients.consumer.OffsetAndMetadata
import org.apache.kafka.common.TopicPartition
import org.apache.kafka.connect.sink.{SinkRecord, SinkTask}
import scala.collection.JavaConversions._


/**
  * Created by [email protected] on 27/08/2017. 
  * stream-reactor
  */
class MqttSinkTask extends SinkTask with StrictLogging {
  private val progressCounter = new ProgressCounter
  private var enableProgress: Boolean = false
  private var writer: Option[MqttWriter] = None

  override def start(props: util.Map[String, String]): Unit = {
    logger.info(scala.io.Source.fromInputStream(getClass.getResourceAsStream("/mqtt-sink-ascii.txt")).mkString + s" v $version")

    MqttSinkConfig.config.parse(props)
    val sinkConfig = new MqttSinkConfig(props)
    enableProgress = sinkConfig.getBoolean(MqttConfigConstants.PROGRESS_COUNTER_ENABLED)
    val settings = MqttSinkSettings(sinkConfig)

    //if error policy is retry set retry interval
    if (settings.errorPolicy.equals(ErrorPolicyEnum.RETRY)) {
      context.timeout(sinkConfig.getInt(MqttConfigConstants.ERROR_RETRY_INTERVAL).toLong)
    }

    writer = Some(MqttWriter(settings))
  }

  override def put(records: util.Collection[SinkRecord]): Unit = {
    require(writer.nonEmpty, "Writer is not set!")
    val seq = records.toVector
    writer.foreach(w => w.write(records.toSet))

    if (enableProgress) {
      progressCounter.update(seq)
    }
  }

  /**
    * Clean up writer
    **/
  override def stop(): Unit = {
    logger.info("Stopping Mqtt sink.")
    writer.foreach(w => w.close)
    progressCounter.empty
  }

  override def flush(map: util.Map[TopicPartition, OffsetAndMetadata]): Unit = {
    require(writer.nonEmpty, "Writer is not set!")
    writer.foreach(w => w.flush)
  }

  override def version: String = Option(getClass.getPackage.getImplementationVersion).getOrElse("")
}