jetbrains.exodus.util.UnsafeHolder.kt Maven / Gradle / Ivy

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Xodus is pure Java transactional schema-less embedded database

There is a newer version: 2.0.1

/**
 * Copyright 2010 - 2018 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
 *
 * http://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]
    }

    internal fun  doPrivileged(f: () -> T): T {
        return AccessController.doPrivileged(PrivilegedExceptionAction {
            f()
        })
    }
}