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 30 import java.nio.Buffer; 31 import java.nio.ByteBuffer; 32 33 public interface JavaNioAccess { 34 /** 35 * Provides access to information on buffer usage. 36 */ 37 interface BufferPool { 38 String getName(); 39 long getCount(); 40 long getTotalCapacity(); 41 long getMemoryUsed(); 42 } 43 BufferPool getDirectBufferPool(); 44 45 /** 46 * Constructs a direct ByteBuffer referring to the block of memory starting 47 * at the given memory address and extending {@code cap} bytes. 48 * The {@code ob} parameter is an arbitrary object that is attached 49 * to the resulting buffer. 50 * Used by {@code jdk.internal.foreignMemorySegmentImpl}. 51 */ 52 ByteBuffer newDirectByteBuffer(long addr, int cap, Object obj, MemorySegmentProxy segment); 53 54 /** 55 * Constructs an heap ByteBuffer with given backing array, offset, capacity and segment. 56 * Used by {@code jdk.internal.foreignMemorySegmentImpl}. 57 */ 58 ByteBuffer newHeapByteBuffer(byte[] hb, int offset, int capacity, MemorySegmentProxy segment); 59 60 /** 61 * Used by {@code jdk.internal.foreign.Utils}. 62 */ 63 Object getBufferBase(ByteBuffer bb); 64 65 /** 66 * Used by {@code jdk.internal.foreign.Utils}. 67 */ 68 long getBufferAddress(ByteBuffer bb); 69 70 /** 71 * Used by byte buffer var handle views. 72 */ 73 void checkSegment(Buffer buffer); 74 }