--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/java/nio/BufferPoolMXBean.java	Tue Aug 26 10:21:22 2008 +0100
@@ -0,0 +1,94 @@
+/*
+ * Copyright 2007-2008 Sun Microsystems, Inc.  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.  Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+package java.nio;
+
+import java.lang.management.PlatformManagedObject;
+
+/**
+ * The management interface for a buffer pool.
+ *
+ * <p> A class implementing this interface is an <a href=
+ * "java.lang.management.ManagementFactory.html#MXBean">MXBean</a>. A Java
+ * virtual machine has one or more implementations of this interface. The {@link
+ * java.lang.management.ManagementFactory#getPlatformMXBeans getPlatformMXBeans}
+ * method can be used to obtain the list of {@code BufferPoolMXBean} objects
+ * representing the management interfaces for pools of buffers as follows:
+ * <pre>
+ *     List&lt;BufferPoolMXBean&gt; pools = ManagementFactory.getPlatformMXBeans(BufferPoolMXBean.class);
+ * </pre>
+ *
+ * <p> The management interfaces are also registered with the platform {@link
+ * javax.management.MBeanServer MBeanServer}. The {@link
+ * javax.management.ObjectName ObjectName} that uniquely identifies the
+ * management interface within the {@code MBeanServer} takes the form:
+ * <blockquote>
+ *    <tt>java.nio:type=BufferPool</tt><tt>,name=</tt><i>pool name</i>
+ * </blockquote>
+ * where <em>pool name</em> is the {@link #getName name} of the buffer pool.
+ *
+ * @since   1.7
+ */
+
+public interface BufferPoolMXBean extends PlatformManagedObject {
+
+    /**
+     * Returns the name representing this buffer pool.
+     *
+     * @return  The name of this buffer pool.
+     */
+    String getName();
+
+    /**
+     * Returns an estimate of the number of buffers in the pool.
+     *
+     * @return  An estimate of the number of buffers in this pool
+     */
+    long getCount();
+
+    /**
+     * Returns an estimate of the total capacity of the buffers in this pool.
+     * A buffer's capacity is the number of elements it contains and the value
+     * returned by this method is an estimate of the total capacity of buffers
+     * in the pool in bytes.
+     *
+     * @return  An estimate of the total capacity of the buffers in this pool
+     *          in bytes
+     */
+    long getTotalCapacity();
+
+    /**
+     * Returns an estimate of the memory that the Java virtual machine is using
+     * for this buffer pool. The value returned by this method may differ
+     * from the estimate of the total {@link #getTotalCapacity capacity} of
+     * the buffers in this pool. This difference is explained by alignment,
+     * memory allocator, and other implementation specific reasons.
+     *
+     * @return  An estimate of the memory that the Java virtual machine is using
+     *          for this buffer pool in bytes, or {@code -1L} if an estimate of
+     *          the memory usage is not available
+     */
+    long getMemoryUsed();
+}