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/*
 * Copyright (C) 2005, The Beangle Software.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see .
 */

package org.beangle.commons.concurrent

import org.beangle.commons.logging.Logging

import java.util.concurrent.LinkedBlockingQueue

object Workers {

  def work[T](payloads: Iterable[T], job: T => Unit, threadPoolSize: Int = 0): Unit = {
    val loads = new LinkedBlockingQueue[T]
    import scala.jdk.CollectionConverters.*
    loads.addAll(payloads.toSeq.asJava)

    val threads = if threadPoolSize <= 0 then Runtime.getRuntime.availableProcessors else threadPoolSize
    Tasks.start(new Work(loads, job), threads)
  }

  class Work[T](payloads: LinkedBlockingQueue[T], job: T => Unit) extends Runnable, Logging {

    def run(): Unit = {
      while (!payloads.isEmpty) {
        try {
          val pk = payloads.poll()
          if (null != pk) job(pk)
        } catch {
          case e: IndexOutOfBoundsException =>
          case e: Exception => logger.error("Error in job execution.", e)
        }
      }
    }
  }
}