1 /*

     2  * Copyright (c) 1997, 2014, 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 

    27 /*

    28  * The Original Code is HAT. The Initial Developer of the

    29  * Original Code is Bill Foote, with contributions from others

    30  * at JavaSoft/Sun.

    31  */

    32 

    33 package com.sun.tools.hat.internal.server;

    34 

    35 import com.sun.tools.hat.internal.model.*;

    36 import java.util.*;

    37 

    38 public class FinalizerSummaryQuery extends QueryHandler {

    39     public void run() {

    40         Enumeration<?> objs = snapshot.getFinalizerObjects();

    41         startHtml("Finalizer Summary");

    42 

    43         out.println("<p align='center'>");

    44         out.println("<b><a href='/'>All Classes (excluding platform)</a></b>");

    45         out.println("</p>");

    46 

    47         printFinalizerSummary(objs);

    48         endHtml();

    49     }

    50 

    51     private static class HistogramElement {

    52         public HistogramElement(JavaClass clazz) {

    53             this.clazz = clazz;

    54         }

    55 

    56         public void updateCount() {

    57             this.count++;

    58         }

    59 

    60         public int compare(HistogramElement other) {

    61             long diff = other.count - count;

    62             return (diff == 0L)? 0 : ((diff > 0L)? +1 : -1);

    63         }

    64 

    65         public JavaClass getClazz() {

    66             return clazz;

    67         }

    68 

    69         public long getCount() {

    70             return count;

    71         }

    72 

    73         private JavaClass clazz;

    74         private long count;

    75     }

    76 

    77     private void printFinalizerSummary(Enumeration<?> objs) {

    78         int count = 0;

    79         Map<JavaClass, HistogramElement> map = new HashMap<JavaClass, HistogramElement>();

    80 

    81         while (objs.hasMoreElements()) {

    82             JavaHeapObject obj = (JavaHeapObject) objs.nextElement();

    83             count++;

    84             JavaClass clazz = obj.getClazz();

    85             if (! map.containsKey(clazz)) {

    86                 map.put(clazz, new HistogramElement(clazz));

    87             }

    88             HistogramElement element = map.get(clazz);

    89             element.updateCount();

    90         }

    91 

    92         out.println("<p align='center'>");

    93         out.println("<b>");

    94         out.println("Total ");

    95         if (count != 0) {

    96             out.print("<a href='/finalizerObjects/'>instances</a>");

    97         } else {

    98             out.print("instances");

    99         }

   100         out.println(" pending finalization: ");

   101         out.print(count);

   102         out.println("</b></p><hr>");

   103 

   104         if (count == 0) {

   105             return;

   106         }

   107 

   108         // calculate and print histogram

   109         HistogramElement[] elements = new HistogramElement[map.size()];

   110         map.values().toArray(elements);

   111         Arrays.sort(elements, new Comparator<HistogramElement>() {

   112                     public int compare(HistogramElement o1, HistogramElement o2) {

   113                         return o1.compare(o2);

   114                     }

   115                 });

   116 

   117         out.println("<table border=1 align=center>");

   118         out.println("<tr><th>Count</th><th>Class</th></tr>");

   119         for (int j = 0; j < elements.length; j++) {

   120             out.println("<tr><td>");

   121             out.println(elements[j].getCount());

   122             out.println("</td><td>");

   123             printClass(elements[j].getClazz());

   124             out.println("</td><tr>");

   125         }

   126         out.println("</table>");

   127     }

   128 }