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MachineMACAddress.scala
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MachineMACAddress.scala
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/*
* 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.septech.snowflake4s.identifier
import java.lang.management.ManagementFactory
import java.net._
import com.septech.snowflake4s.MachineIdentifier
import com.septech.snowflake4s.exception.MacAddressException
import scala.util.Failure
import scala.util.Success
import scala.util.Try
private[snowflake4s] class MachineMACAddress extends MachineIdentifier {
override def getId: String = Try {
val localNetworkInterface = MachineMACAddress.guessBestInterface
localNetworkInterface.get // NPE here
.getHardwareAddress
.map(byte => byte & 0xFF)
.foldLeft(0L) { (acc, item) => (acc << 8) + item }
.toString
} match {
case Failure(_) => throw new MacAddressException()
case Success(address) => address
}
override def getWorkerId: String = {
ManagementFactory.getRuntimeMXBean.getName.split("@").headOption
.fold(throw new RuntimeException("Can not get process id of application"))(pid => pid)
}
}
private object MachineMACAddress {
import scala.collection.JavaConverters._
def getAvailableInterfaces: Map[String, NetworkInterface] =
NetworkInterface.getNetworkInterfaces.asScala
.foldLeft(Map.empty[String, NetworkInterface]){ (map, intf) =>
if (isValidInterface(intf))
map + ((intf.getName, intf))
else
map
}
def guessBestInterface: Option[NetworkInterface] =
getAvailableInterfaces.headOption.map(_._2)
private def isValidInterface(intf: NetworkInterface): Boolean =
Option(intf.getHardwareAddress).isDefined && intf.isUp && !intf.isVirtual
}