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 }