/*

 * Copyright (c) 2007, 2011, 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.misc;

import java.nio.Buffer;

import java.nio.ByteBuffer;

public interface JavaNioAccess {

    /**

     * Provides access to information on buffer usage.

     */

    interface BufferPool {

        String getName();

        long getCount();

        long getTotalCapacity();

        long getMemoryUsed();

    }

    BufferPool getDirectBufferPool();

    /**

     * Constructs a direct ByteBuffer referring to the block of memory starting

     * at the given memory address and and extending {@code cap} bytes.

     * The {@code ob} parameter is an arbitrary object that is attached

     * to the resulting buffer.

     */

    ByteBuffer newDirectByteBuffer(long addr, int cap, Object ob);

    /**

     * Truncates a buffer by changing its capacity to 0.

     */

    void truncate(Buffer buf);

}