jetbrains.exodus.runtime.OOMGuard.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.runtime
import java.lang.ref.Reference
import java.lang.ref.SoftReference
import java.lang.ref.WeakReference
class OOMGuard(private val extraBytes: Int = 0,
private val softRef: Boolean = true /* use either SoftReference, or WeakReference*/) {
private var ref: Reference = newReference()
fun isItCloseToOOM() = ref.get() == null
fun reset() {
ref = newReference()
}
private fun newReference() =
(if (extraBytes == 0) Any() else ByteArray(extraBytes)).let {
if (softRef) SoftReference(it) else WeakReference(it)
}
}