io.finch.internal.currentTime.scala Maven / Gradle / Ivy

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package io.finch.internal

import java.time.format.DateTimeFormatter
import java.time.{Instant, ZoneId}
import java.util.Locale

object currentTime {
  private val formatter: DateTimeFormatter =
    DateTimeFormatter.ofPattern("EEE, dd MMM yyyy HH:mm:ss zzz").withLocale(Locale.ENGLISH).withZone(ZoneId.of("GMT"))

  private class Last(var millis: Long, var header: String)

  private val last = new ThreadLocal[Last] {
    override def initialValue: Last = new Last(0, "")
  }

  def apply(): String = {
    val local = last.get()
    val time = System.currentTimeMillis()

    if (time - local.millis > 1000) {
      local.millis = time
      local.header = formatter.format(Instant.ofEpochMilli(time))
    }

    local.header
  }
}