jetbrains.exodus.system.OperatingSystem.kt Maven / Gradle / Ivy
/**
* Copyright 2010 - 2022 JetBrains s.r.o.
*
* 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
*
* https://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 jetbrains.exodus.system
import com.sun.management.OperatingSystemMXBean
import jetbrains.exodus.core.execution.SharedTimer
import java.lang.management.ManagementFactory
object OperatingSystem {
private val osBean: OperatingSystemMXBean = ManagementFactory.getOperatingSystemMXBean() as OperatingSystemMXBean
private var cachedFreePhysicalMemorySize = Long.MIN_VALUE
private var cachedSystemCpuLoad = Double.MIN_VALUE
private val periodicInvalidate by lazy {
SharedTimer.registerNonExpirablePeriodicTask {
cachedFreePhysicalMemorySize = Long.MIN_VALUE
cachedSystemCpuLoad = Double.MIN_VALUE
}
}
@JvmStatic
fun getFreePhysicalMemorySize(): Long {
cachedFreePhysicalMemorySize.let { memSize ->
return if (memSize < 0L) {
periodicInvalidate
osBean.freePhysicalMemorySize.also { cachedFreePhysicalMemorySize = it }
} else {
memSize
}
}
}
@JvmStatic
fun getSystemCpuLoad(): Double {
cachedSystemCpuLoad.let { cpuLoad ->
return if (cpuLoad < 0) {
periodicInvalidate
osBean.systemCpuLoad.also { cachedSystemCpuLoad = it }
} else {
cpuLoad
}
}
}
}