1 /*

     2  * Copyright (c) 2005, 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 package sun.management;

    27 

    28 import java.io.IOException;

    29 import java.util.ArrayList;

    30 import java.util.List;

    31 import javax.management.ObjectName;

    32 

    33 import com.sun.management.HotSpotDiagnosticMXBean;

    34 import com.sun.management.VMOption;

    35 

    36 /**

    37  * Implementation of the diagnostic MBean for Hotspot VM.

    38  */

    39 public class HotSpotDiagnostic implements HotSpotDiagnosticMXBean {

    40     public HotSpotDiagnostic() {

    41     }

    42 

    43     @Override

    44     public void dumpHeap(String outputFile, boolean live) throws IOException {

    45         SecurityManager security = System.getSecurityManager();

    46         if (security != null) {

    47             security.checkWrite(outputFile);

    48             Util.checkControlAccess();

    49         }

    50 

    51         dumpHeap0(outputFile, live);

    52     }

    53 

    54     private native void dumpHeap0(String outputFile, boolean live) throws IOException;

    55 

    56     @Override

    57     public List<VMOption> getDiagnosticOptions() {

    58         List<Flag> allFlags = Flag.getAllFlags();

    59         List<VMOption> result = new ArrayList<>();

    60         for (Flag flag : allFlags) {

    61             if (flag.isWriteable() && flag.isExternal()) {

    62                 result.add(flag.getVMOption());

    63             }

    64         }

    65         return result;

    66     }

    67 

    68     @Override

    69     public VMOption getVMOption(String name) {

    70         if (name == null) {

    71             throw new NullPointerException("name cannot be null");

    72         }

    73 

    74         Flag f = Flag.getFlag(name);

    75         if (f == null) {

    76             throw new IllegalArgumentException("VM option \"" +

    77                 name + "\" does not exist");

    78         }

    79         return f.getVMOption();

    80     }

    81 

    82     @Override

    83     public void setVMOption(String name, String value) {

    84         if (name == null) {

    85             throw new NullPointerException("name cannot be null");

    86         }

    87         if (value == null) {

    88             throw new NullPointerException("value cannot be null");

    89         }

    90 

    91         Util.checkControlAccess();

    92         Flag flag = Flag.getFlag(name);

    93         if (flag == null) {

    94             throw new IllegalArgumentException("VM option \"" +

    95                 name + "\" does not exist");

    96         }

    97         if (!flag.isWriteable()){

    98             throw new IllegalArgumentException("VM Option \"" +

    99                 name + "\" is not writeable");

   100         }

   101 

   102         // Check the type of the value

   103         Object v = flag.getValue();

   104         if (v instanceof Long) {

   105             try {

   106                 long l = Long.parseLong(value);

   107                 Flag.setLongValue(name, l);

   108             } catch (NumberFormatException e) {

   109                 throw new IllegalArgumentException("Invalid value:" +

   110                         " VM Option \"" + name + "\"" +

   111                         " expects numeric value", e);

   112             }

   113         } else if (v instanceof Double) {

   114             try {

   115                 double d = Double.parseDouble(value);

   116                 Flag.setDoubleValue(name, d);

   117             } catch (NumberFormatException e) {

   118                 throw new IllegalArgumentException("Invalid value:" +

   119                         " VM Option \"" + name + "\"" +

   120                         " expects numeric value", e);

   121             }

   122         } else if (v instanceof Boolean) {

   123             if (!value.equalsIgnoreCase("true") &&

   124                 !value.equalsIgnoreCase("false")) {

   125                 throw new IllegalArgumentException("Invalid value:" +

   126                     " VM Option \"" + name + "\"" +

   127                     " expects \"true\" or \"false\".");

   128             }

   129             Flag.setBooleanValue(name, Boolean.parseBoolean(value));

   130         } else if (v instanceof String) {

   131             Flag.setStringValue(name, value);

   132         } else {

   133             throw new IllegalArgumentException("VM Option \"" +

   134                 name + "\" is of an unsupported type: " +

   135                 v.getClass().getName());

   136         }

   137     }

   138 

   139     @Override

   140     public ObjectName getObjectName() {

   141         return Util.newObjectName("com.sun.management:type=HotSpotDiagnostic");

   142     }

   143 }