/*
 * 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.reef.examples.hellospark

import org.apache.reef.driver.evaluator.AllocatedEvaluator
import org.apache.reef.driver.evaluator.EvaluatorRequestor
import org.apache.reef.driver.task.TaskConfiguration
import org.apache.reef.tang.Configuration
import org.apache.reef.tang.annotations.Unit
import org.apache.reef.wake.EventHandler
import org.apache.reef.wake.time.event.StartTime

import javax.inject.Inject
import java.util.logging.Level
import java.util.logging.Logger

object ReefOnSparkDriver {
  private val LOG: Logger = Logger.getLogger(classOf[ReefOnSparkDriver].getName)
}

@Unit
final class ReefOnSparkDriver @Inject private(val requestor: EvaluatorRequestor) {

  ReefOnSparkDriver.LOG.log(Level.FINE, "Instantiated ReefOnSparkDriver")

  final class StartHandler extends EventHandler[StartTime] {
    def onNext(startTime: StartTime) {

      ReefOnSparkDriver.LOG.log(Level.INFO, "Start ReefOnSparkDriver: {0}", startTime)

      requestor.newRequest
        .setNumber(1)
        .setMemory(64)
        .setNumberOfCores(1)
        .submit()

      ReefOnSparkDriver.LOG.log(Level.INFO, "Requested Evaluator.")
    }
  }

  final class EvaluatorAllocatedHandler extends EventHandler[AllocatedEvaluator] {
    def onNext(allocatedEvaluator: AllocatedEvaluator) {

      ReefOnSparkDriver.LOG.log(Level.INFO,
        "Submitting ReefOnSparkTask task to AllocatedEvaluator: {0}", allocatedEvaluator)

      val taskConfiguration: Configuration = TaskConfiguration.CONF
        .set(TaskConfiguration.IDENTIFIER, "ReefOnSparkTask")
        .set(TaskConfiguration.TASK, classOf[ReefOnSparkTask])
        .build

      allocatedEvaluator.submitTask(taskConfiguration)
    }
  }
}