Java example source code file (UnsafeQualifiedFieldAccessorImpl.java)

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Java - Java tags/keywords

reflection, unsafefieldaccessorimpl, unsafequalifiedfieldaccessorimpl

The UnsafeQualifiedFieldAccessorImpl.java Java example source code

/*
 * Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package sun.reflect;

import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import sun.misc.Unsafe;

/**
 * Base class for sun.misc.Unsafe-based FieldAccessors for fields with
 * final or volatile qualifiers. These differ from unqualified
 * versions in that (1) they check for read-only status (2) they use
 * the volatile forms of Unsafe get/put methods. (When accessed via
 * reflection, finals act as slightly "lighter" forms of volatiles. So
 * the volatile forms are heavier than necessary in terms of
 * underlying reordering rules and memory barriers, but preserve
 * correctness.)
 */

abstract class UnsafeQualifiedFieldAccessorImpl
    extends UnsafeFieldAccessorImpl
{
    protected final boolean isReadOnly;

    UnsafeQualifiedFieldAccessorImpl(Field field, boolean isReadOnly) {
        super(field);
        this.isReadOnly = isReadOnly;
    }
}