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 { getName()36 String getName(); getCount()37 long getCount(); getTotalCapacity()38 long getTotalCapacity(); getMemoryUsed()39 long getMemoryUsed(); 40 } getDirectBufferPool()41 BufferPool getDirectBufferPool(); 42 43 /** 44 * Constructs a direct ByteBuffer referring to the block of memory starting 45 * at the given memory address and and extending {@code cap} bytes. 46 * The {@code ob} parameter is an arbitrary object that is attached 47 * to the resulting buffer. 48 */ newDirectByteBuffer(long addr, int cap, Object ob)49 ByteBuffer newDirectByteBuffer(long addr, int cap, Object ob); 50 51 /** 52 * Truncates a buffer by changing its capacity to 0. 53 */ truncate(Buffer buf)54 void truncate(Buffer buf); 55 56 } 57