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13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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15  * accompanied this code).
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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