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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).
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25 
26 package com.sun.corba.se.impl.activation;
27 
28 import java.util.*;
29 import com.sun.corba.se.impl.orbutil.ORBConstants;
30 
31 /** ProcessMonitorThread is started when ServerManager is instantiated. The
32   * thread wakes up every minute (This can be changed by setting sleepTime) and
33   * makes sure that all the processes (Servers) registered with the ServerTool
34   * are healthy. If not the state in ServerTableEntry will be changed to
35   * De-Activated.
36   * Note: This thread can be killed from the main thread by calling
37   *       interrupThread()
38   */
39 public class ProcessMonitorThread extends java.lang.Thread {
40     private HashMap serverTable;
41     private int sleepTime;
42     private static ProcessMonitorThread instance = null;
43 
ProcessMonitorThread( HashMap ServerTable, int SleepTime )44     private ProcessMonitorThread( HashMap ServerTable, int SleepTime ) {
45         serverTable = ServerTable;
46         sleepTime = SleepTime;
47     }
48 
run( )49     public void run( ) {
50         while( true ) {
51             try {
52                 // Sleep's for a specified time, before checking
53                 // the Servers health. This will repeat as long as
54                 // the ServerManager (ORBD) is up and running.
55                 Thread.sleep( sleepTime );
56             } catch( java.lang.InterruptedException e ) {
57                 break;
58             }
59             Iterator serverList;
60             synchronized ( serverTable ) {
61                 // Check each ServerTableEntry to make sure that they
62                 // are in the right state.
63                 serverList = serverTable.values().iterator();
64             }
65             try {
66                 checkServerHealth( serverList );
67             } catch( ConcurrentModificationException e ) {
68                 break;
69             }
70         }
71     }
72 
checkServerHealth( Iterator serverList )73     private void checkServerHealth( Iterator serverList ) {
74         if( serverList == null ) return;
75         while (serverList.hasNext( ) ) {
76             ServerTableEntry entry = (ServerTableEntry) serverList.next();
77             entry.checkProcessHealth( );
78         }
79     }
80 
start( HashMap serverTable )81     static void start( HashMap serverTable ) {
82         int sleepTime = ORBConstants.DEFAULT_SERVER_POLLING_TIME;
83 
84         String pollingTime = System.getProperties().getProperty(
85             ORBConstants.SERVER_POLLING_TIME );
86 
87         if ( pollingTime != null ) {
88             try {
89                 sleepTime = Integer.parseInt( pollingTime );
90             } catch (Exception e ) {
91                 // Too late to complain, Just use the default
92                 // sleepTime
93             }
94         }
95 
96         instance = new ProcessMonitorThread( serverTable,
97             sleepTime );
98         instance.setDaemon( true );
99         instance.start();
100     }
101 
interruptThread( )102     static void interruptThread( ) {
103         instance.interrupt();
104     }
105 }
106