1 /*
   2  * Copyright (c) 2007, 2018, 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 jdk.internal.access;
  27 
  28 import jdk.internal.access.foreign.MemorySegmentProxy;
  29 import jdk.internal.misc.VM.BufferPool;
  30 
  31 import java.nio.Buffer;
  32 import java.nio.ByteBuffer;
  33 
  34 public interface JavaNioAccess {
  35 
  36     /**
  37      * Used by {@code jdk.internal.misc.VM}.
  38      */
  39     BufferPool getDirectBufferPool();
  40 
  41     /**
  42      * Constructs a direct ByteBuffer referring to the block of memory starting
  43      * at the given memory address and extending {@code cap} bytes.
  44      * The {@code ob} parameter is an arbitrary object that is attached
  45      * to the resulting buffer.
  46      * Used by {@code jdk.internal.foreignMemorySegmentImpl}.
  47      */
  48     ByteBuffer newDirectByteBuffer(long addr, int cap, Object obj, MemorySegmentProxy segment);
  49 
  50     /**
  51      * Constructs an heap ByteBuffer with given backing array, offset, capacity and segment.
  52      * Used by {@code jdk.internal.foreignMemorySegmentImpl}.
  53      */
  54     ByteBuffer newHeapByteBuffer(byte[] hb, int offset, int capacity, MemorySegmentProxy segment);
  55 
  56     /**
  57      * Used by {@code jdk.internal.foreign.Utils}.
  58      */
  59     Object getBufferBase(ByteBuffer bb);
  60 
  61     /**
  62      * Used by {@code jdk.internal.foreign.Utils}.
  63      */
  64     long getBufferAddress(ByteBuffer bb);
  65 
  66     /**
  67      * Used by byte buffer var handle views.
  68      */
  69     void checkSegment(Buffer buffer);
  70 }