UnsafeUtils.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 hivemall.utils.lang;

import java.lang.reflect.Field;

import sun.misc.Unsafe;

@SuppressWarnings("restriction")
public final class UnsafeUtils {

    private static final Unsafe unsafe;
    static {
        unsafe = _getUnsafe();
    }

    private UnsafeUtils() {}

    public static Unsafe getUnsafe() {
        return unsafe;
    }

    private static Unsafe _getUnsafe() {
        if (UnsafeUtils.class.getClassLoader() == null) {
            return Unsafe.getUnsafe();
        }
        try {
            final Field fld = Unsafe.class.getDeclaredField("theUnsafe");
            fld.setAccessible(true);
            return (Unsafe) fld.get(UnsafeUtils.class);
        } catch (Exception e) {
            return null;
        }
    }
}