1 /*

     2  * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 package sun.misc;

    27 

    28 import java.nio.Buffer;

    29 import java.nio.ByteBuffer;

    30 

    31 public interface JavaNioAccess {

    32     /**

    33      * Provides access to information on buffer usage.

    34      */

    35     interface BufferPool {

    36         String getName();

    37         long getCount();

    38         long getTotalCapacity();

    39         long getMemoryUsed();

    40     }

    41     BufferPool getDirectBufferPool();

    42 

    43     /**

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

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

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

    47      * to the resulting buffer.

    48      */

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

    50 

    51     /**

    52      * Truncates a buffer by changing its capacity to 0.

    53      */

    54     void truncate(Buffer buf);

    55 

    56 }