org.spf4j.base.AlmostSafe Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of spf4j-core Show documentation

A continuously growing collection of utilities to measure performance, get better diagnostics, improve performance, or do things more reliably, faster that other open source libraries...

There is a newer version: 8.10.0

Show newest version

/*
 * Copyright (c) 2001-2017, Zoltan Farkas All Rights Reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * Additionally licensed with:
 *
 * 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 org.spf4j.base;

import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import java.lang.reflect.Field;
import java.security.AccessController;
import java.security.PrivilegedAction;
//CHECKSTYLE:OFF
import sun.misc.Unsafe;
//CHECKSTYLE:ON

/**
 * Expose
 * @author zoly
 */
@SuppressFBWarnings("IICU_INCORRECT_INTERNAL_CLASS_USE")
public final class AlmostSafe {

    public static final Unsafe USF;

    private AlmostSafe() { }

    static {

        USF = AccessController.doPrivileged((PrivilegedAction) () -> {
          try {
            Field theUnsafe = Unsafe.class.getDeclaredField("theUnsafe");
            theUnsafe.setAccessible(true);
            return (Unsafe) theUnsafe.get(null);
          } catch (IllegalArgumentException | IllegalAccessException
                  | NoSuchFieldException | SecurityException ex) {
            throw new ExceptionInInitializerError(ex);
          }
        });
    }



}