--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.management/share/classes/sun/management/MemoryImpl.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,168 @@
+/*
+ * Copyright (c) 2003, 2008, 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
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package sun.management;
+
+import java.lang.management.ManagementFactory;
+import java.lang.management.MemoryMXBean;
+import java.lang.management.MemoryUsage;
+import java.lang.management.MemoryNotificationInfo;
+import java.lang.management.MemoryManagerMXBean;
+import java.lang.management.MemoryPoolMXBean;
+import javax.management.ObjectName;
+import javax.management.MBeanNotificationInfo;
+import javax.management.Notification;
+import javax.management.openmbean.CompositeData;
+
+/**
+ * Implementation class for the memory subsystem.
+ * Standard and committed hotspot-specific metrics if any.
+ *
+ * ManagementFactory.getMemoryMXBean() returns an instance
+ * of this class.
+ */
+class MemoryImpl extends NotificationEmitterSupport
+                 implements MemoryMXBean {
+
+    private final VMManagement jvm;
+
+    private static MemoryPoolMXBean[] pools = null;
+    private static MemoryManagerMXBean[] mgrs = null;
+
+    /**
+     * Constructor of MemoryImpl class
+     */
+    MemoryImpl(VMManagement vm) {
+        this.jvm = vm;
+    }
+
+    public int getObjectPendingFinalizationCount() {
+        return jdk.internal.misc.VM.getFinalRefCount();
+    }
+
+    public void gc() {
+        Runtime.getRuntime().gc();
+    }
+
+    // Need to make a VM call to get coherent value
+    public MemoryUsage getHeapMemoryUsage() {
+        return getMemoryUsage0(true);
+    }
+
+    public MemoryUsage getNonHeapMemoryUsage() {
+        return getMemoryUsage0(false);
+    }
+
+    public boolean isVerbose() {
+        return jvm.getVerboseGC();
+    }
+
+    public void setVerbose(boolean value) {
+        Util.checkControlAccess();
+
+        setVerboseGC(value);
+    }
+
+    // The current Hotspot implementation does not support
+    // dynamically add or remove memory pools & managers.
+    static synchronized MemoryPoolMXBean[] getMemoryPools() {
+        if (pools == null) {
+            pools = getMemoryPools0();
+        }
+        return pools;
+    }
+    static synchronized MemoryManagerMXBean[] getMemoryManagers() {
+        if (mgrs == null) {
+            mgrs = getMemoryManagers0();
+        }
+        return mgrs;
+    }
+    private static native MemoryPoolMXBean[] getMemoryPools0();
+    private static native MemoryManagerMXBean[] getMemoryManagers0();
+    private native MemoryUsage getMemoryUsage0(boolean heap);
+    private native void setVerboseGC(boolean value);
+
+    private final static String notifName =
+        "javax.management.Notification";
+    private final static String[] notifTypes = {
+        MemoryNotificationInfo.MEMORY_THRESHOLD_EXCEEDED,
+        MemoryNotificationInfo.MEMORY_COLLECTION_THRESHOLD_EXCEEDED
+    };
+    private final static String[] notifMsgs  = {
+        "Memory usage exceeds usage threshold",
+        "Memory usage exceeds collection usage threshold"
+    };
+
+    public MBeanNotificationInfo[] getNotificationInfo() {
+        return new MBeanNotificationInfo[] {
+            new MBeanNotificationInfo(notifTypes, notifName, "Memory Notification")
+        };
+    }
+
+    private static String getNotifMsg(String notifType) {
+        for (int i = 0; i < notifTypes.length; i++) {
+            if (notifType == notifTypes[i]) {
+                return notifMsgs[i];
+            }
+        }
+        return "Unknown message";
+    }
+
+    private static long seqNumber = 0;
+    private static long getNextSeqNumber() {
+        return ++seqNumber;
+    }
+
+    static void createNotification(String notifType,
+                                   String poolName,
+                                   MemoryUsage usage,
+                                   long count) {
+        MemoryImpl mbean = (MemoryImpl) ManagementFactory.getMemoryMXBean();
+        if (!mbean.hasListeners()) {
+            // if no listener is registered.
+            return;
+        }
+        long timestamp = System.currentTimeMillis();
+        String msg = getNotifMsg(notifType);
+        Notification notif = new Notification(notifType,
+                                              mbean.getObjectName(),
+                                              getNextSeqNumber(),
+                                              timestamp,
+                                              msg);
+        MemoryNotificationInfo info =
+            new MemoryNotificationInfo(poolName,
+                                       usage,
+                                       count);
+        CompositeData cd =
+            MemoryNotifInfoCompositeData.toCompositeData(info);
+        notif.setUserData(cd);
+        mbean.sendNotification(notif);
+    }
+
+    public ObjectName getObjectName() {
+        return Util.newObjectName(ManagementFactory.MEMORY_MXBEAN_NAME);
+    }
+
+}