jetbrains.exodus.util.UnsafeHolder.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.util
import java.security.AccessController
import java.security.PrivilegedExceptionAction
object UnsafeHolder {
val unsafeClass: Class<*> = doPrivileged { Class.forName("sun.misc.Unsafe") }
val theUnsafe: Any = doPrivileged {
unsafeClass.getDeclaredField("theUnsafe").apply { isAccessible = true }[null]
}
fun doPrivileged(f: () -> T): T {
return AccessController.doPrivileged(PrivilegedExceptionAction {
f()
})
}
}