UISystemProperties


1   /*
2    * Copyright (C) 2005 Alfresco, Inc.
3    *
4    * Licensed under the Mozilla Public License version 1.1 
5    * with a permitted attribution clause. You may obtain a
6    * copy of the License at
7    *
8    *   http://www.alfresco.org/legal/license.txt
9    *
10   * Unless required by applicable law or agreed to in writing,
11   * software distributed under the License is distributed on an
12   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
13   * either express or implied. See the License for the specific
14   * language governing permissions and limitations under the
15   * License.
16   */
17  package org.alfresco.web.ui.common.component.debug;
18  
19  import java.util.Map  ;
20  import java.util.TreeMap  ;
21  
22  /**
23   * Component which displays the system properties of the VM
24   * 
25   * @author gavinc
26   */
27  public class UISystemProperties extends BaseDebugComponent
28  {
29     /**
30      * @see javax.faces.component.UIComponent#getFamily()
31      */
32     public String   getFamily()
33     {
34        return "org.alfresco.faces.debug.SystemProperties";
35     }
36  
37     /**
38      * @see org.alfresco.web.ui.common.component.debug.BaseDebugComponent#getDebugData()
39      */
40     @SuppressWarnings  ("unchecked")
41     public Map   getDebugData()
42     {
43        // note: sort properties
44        Map   properties = new TreeMap  ();
45        
46        // add the jvm system properties
47        Map   systemProperties = System.getProperties();
48        properties.putAll(systemProperties);
49        
50        // add heap size properties
51        properties.put("heap.size", formatBytes(Runtime.getRuntime().totalMemory()));
52        properties.put("heap.maxsize", formatBytes(Runtime.getRuntime().maxMemory()));
53        properties.put("heap.free", formatBytes(Runtime.getRuntime().freeMemory()));
54        
55        return properties; 
56     }
57     
58     /**
59      * Helper to format bytes for human output
60      * 
61      * @param bytes  bytes
62      * @return  formatted string
63      */
64     private static String   formatBytes(long bytes)
65     {
66         float f = bytes / 1024l;
67         f = f / 1024l;
68         return String.format("%.3fMB (%d bytes)", f, bytes);
69     }
70  }
71
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