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package xyz.driver.core
import java.io.File
import java.lang.management.ManagementFactory
import java.lang.reflect.Modifier
object stats {
final case class MemoryStats(free: Long, total: Long, max: Long)
final case class GarbageCollectorStats(totalGarbageCollections: Long, garbageCollectionTime: Long)
final case class FileRootSpace(path: String, totalSpace: Long, freeSpace: Long, usableSpace: Long)
object SystemStats {
def memoryUsage: MemoryStats = {
val runtime = Runtime.getRuntime
MemoryStats(runtime.freeMemory, runtime.totalMemory, runtime.maxMemory)
}
def availableProcessors: Int = {
Runtime.getRuntime.availableProcessors()
}
def garbageCollectorStats: GarbageCollectorStats = {
import scala.collection.JavaConverters._
val (totalGarbageCollections, garbageCollectionTime) =
ManagementFactory.getGarbageCollectorMXBeans.asScala.foldLeft(0L -> 0L) {
case ((total, collectionTime), gc) =>
(total + math.max(0L, gc.getCollectionCount)) -> (collectionTime + math.max(0L, gc.getCollectionTime))
}
GarbageCollectorStats(totalGarbageCollections, garbageCollectionTime)
}
def fileSystemSpace: Array[FileRootSpace] = {
File.listRoots() map { root =>
FileRootSpace(root.getAbsolutePath, root.getTotalSpace, root.getFreeSpace, root.getUsableSpace)
}
}
def operatingSystemStats: Map[String, String] = {
val operatingSystemMXBean = ManagementFactory.getOperatingSystemMXBean
operatingSystemMXBean.getClass.getDeclaredMethods
.map(method => { method.setAccessible(true); method })
.filter(method => method.getName.startsWith("get") && Modifier.isPublic(method.getModifiers))
.map { method =>
try {
method.getName -> String.valueOf(method.invoke(operatingSystemMXBean))
} catch {
case t: Throwable => method.getName -> t.getMessage
}
} toMap
}
}
}
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