/*
 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */

package jdk.internal.misc;

import java.nio.Buffer;
import java.nio.ByteBuffer;

public interface JavaNioAccess {
    
Provides access to information on buffer usage.
/**
     * Provides access to information on buffer usage.
     */
    interface BufferPool {
        String getName();
        long getCount();
        long getTotalCapacity();
        long getMemoryUsed();
    }
    BufferPool getDirectBufferPool();

    
Constructs a direct ByteBuffer referring to the block of memory starting at the given memory address and extending cap bytes. The ob parameter is an arbitrary object that is attached to the resulting buffer. /**
     * Constructs a direct ByteBuffer referring to the block of memory starting
     * at the given memory address and extending {@code cap} bytes.
     * The {@code ob} parameter is an arbitrary object that is attached
     * to the resulting buffer.
     */
    ByteBuffer newDirectByteBuffer(long addr, int cap, Object ob);

    
Truncates a buffer by changing its capacity to 0.
/**
     * Truncates a buffer by changing its capacity to 0.
     */
    void truncate(Buffer buf);

}