ProcessMonitorThread.java revision 608:7e06bf1dcb09 
1/*
2 * Copyright (c) 2001, 2003, 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
26package com.sun.corba.se.impl.activation;
27
28import java.util.*;
29import 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  */
39public class ProcessMonitorThread extends java.lang.Thread {
40    private HashMap serverTable;
41    private int sleepTime;
42    private static ProcessMonitorThread instance = null;
43
44    private ProcessMonitorThread( HashMap ServerTable, int SleepTime ) {
45        serverTable = ServerTable;
46        sleepTime = SleepTime;
47    }
48
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
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
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
102    static void interruptThread( ) {
103        instance.interrupt();
104    }
105}
106