host/java/JavaHost.java

/* 
 * i-scream central monitoring system
 * http://www.i-scream.org.uk
 * Copyright (C) 2000-2002 i-scream
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

//---PACKAGE DECLARATION---

//---IMPORTS---

/**
 * A small efficient JavaHost
 * Designed to be used as a working design to build the C++ hosts on.
 * Hopefully fully functional and thus can be used as part of a test rig.
 *
 * @author  $Author: tdb $
 * @version $Id: JavaHost.java,v 1.8 2002/05/18 18:15:57 tdb Exp $
 */
class JavaHost {
    
//---FINAL ATTRIBUTES---

//---STATIC METHODS---

//---CONSTRUCTORS---
    
    /**
     * Constructor for the class. Takes in the hostname and port number
     * of the Filter Manager.
     *
     */
    public JavaHost( String serverName, int port ){
        // create a connection to the filter manager
        System.out.println("Creating connection with Filter Manager");
        Config config = new Config(serverName, port);
        // the config class knows what values it wants to get from
        // the configuration system
        
        // create a SystemMonitor object and pass the config
        // as a param so it knows what to do!
        System.out.println("Creating System Monitor");
        SystemMonitor sysMon = new SystemMonitor(config);
        
        try {
            udpcheckInterval = Long.parseLong(config.getProperty("UDPUpdateTime")) * 1000;
            System.out.println("Configured UDPUpdateTime");
        }
        catch ( NumberFormatException e ){
            System.out.println("The value for UDPUpdateTime is invalid, using a default");
            // 1 mins
            udpcheckInterval = 1000 * 60;  // 1 minute
        }
        
        try {
            tcpcheckInterval = Long.parseLong(config.getProperty("TCPUpdateTime")) * 1000;
            System.out.println("Configured TCPUpdateTime");
        }
        catch ( NumberFormatException e ){
            System.out.println("The value for UDPUpdateTime is invalid, using a default");
            // 10 mins
            tcpcheckInterval = 10000 * 60;  // 5 minutes
        }
        
        // the current time..
        long currentTime = System.currentTimeMillis();
        long nextUDP = currentTime + udpcheckInterval;
        long nextTCP = currentTime + tcpcheckInterval;
        
        while ( true ){
            currentTime = System.currentTimeMillis();
            // keep going for ever and ever ;)
            
            if ( nextTCP < nextUDP ){
                try {
                    long sleeptime = nextTCP - currentTime;
                    if ( sleeptime > 0 ){
                        Thread.sleep(sleeptime);
                    }
                    nextTCP += tcpcheckInterval;
                    // send a heartbeat
                    //System.out.println("Sending Heartbeat");
                        System.out.print("+");
                config.sendHeartBeat();
                if ( config.reloadConfig() ){
                    System.out.println("\nRestarting System");
                    break;  
                }
         }
         catch ( InterruptedException e ){
            // do nothing
         }
            }
            else {
                try {
                    long sleeptime = nextUDP - currentTime;
                    if ( sleeptime > 0 ){
                        Thread.sleep(sleeptime);
                    }
                    nextUDP += udpcheckInterval;
                    // send a heartbeat
                //System.out.println("Sending UDP Packet");
                System.out.print(".");
                    LowLevelNet.sendUDPPacket(config, sysMon.getInfo());  
            
         }
         catch ( InterruptedException e ){
            // do nothing
         }  
            }
            
            
        } // while
        
           
    } // public javahost


//---PUBLIC METHODS---

//---PRIVATE METHODS---

//---ACCESSOR/MUTATOR METHODS---

//---ATTRIBUTES---

    private long udpcheckInterval;
    private long tcpcheckInterval;
    private final long defaultUpdateTime = 60000;


//---STATIC ATTRIBUTES---

} // class
Revision:	1.9
Committed:	Tue May 21 16:47:12 2002 UTC (22 years, 4 months ago) by tdb
Branch:	MAIN
Changes since 1.8:	+3 -2 lines
Log Message:	Added URL to GPL headers.
#	User	Rev	Content
1	tdb	1.8	/*
2			* i-scream central monitoring system
3	tdb	1.9	* http://www.i-scream.org.uk
4	tdb	1.8	* Copyright (C) 2000-2002 i-scream
5			*
6			* This program is free software; you can redistribute it and/or
7			* modify it under the terms of the GNU General Public License
8			* as published by the Free Software Foundation; either version 2
9			* of the License, or (at your option) any later version.
10			*
11			* This program is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			* GNU General Public License for more details.
15			*
16			* You should have received a copy of the GNU General Public License
17			* along with this program; if not, write to the Free Software
18			* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19			*/
20
21	ab11	1.2	//---PACKAGE DECLARATION---
22	ab11	1.1
23	ab11	1.2	//---IMPORTS---
24
25			/**
26			* A small efficient JavaHost
27			* Designed to be used as a working design to build the C++ hosts on.
28			* Hopefully fully functional and thus can be used as part of a test rig.
29			*
30	tdb	1.9	* @author $Author: tdb $
31			* @version $Id: JavaHost.java,v 1.8 2002/05/18 18:15:57 tdb Exp $
32	ab11	1.2	*/
33	ab11	1.1	class JavaHost {
34	ab11	1.2
35			//---FINAL ATTRIBUTES---
36
37			//---STATIC METHODS---
38
39			//---CONSTRUCTORS---
40
41			/**
42			* Constructor for the class. Takes in the hostname and port number
43	tdb	1.4	* of the Filter Manager.
44	ab11	1.2	*
45			*/
46			public JavaHost( String serverName, int port ){
47	tdb	1.4	// create a connection to the filter manager
48			System.out.println("Creating connection with Filter Manager");
49	ab11	1.2	Config config = new Config(serverName, port);
50			// the config class knows what values it wants to get from
51	tdb	1.4	// the configuration system
52	ab11	1.2
53	tdb	1.4	// create a SystemMonitor object and pass the config
54	ab11	1.2	// as a param so it knows what to do!
55	ab11	1.3	System.out.println("Creating System Monitor");
56	ab11	1.2	SystemMonitor sysMon = new SystemMonitor(config);
57
58	ab11	1.5	try {
59	ab11	1.7	udpcheckInterval = Long.parseLong(config.getProperty("UDPUpdateTime")) * 1000;
60			System.out.println("Configured UDPUpdateTime");
61	ab11	1.5	}
62			catch ( NumberFormatException e ){
63	ab11	1.7	System.out.println("The value for UDPUpdateTime is invalid, using a default");
64			// 1 mins
65			udpcheckInterval = 1000 * 60; // 1 minute
66	ab11	1.5	}
67
68			try {
69	ab11	1.7	tcpcheckInterval = Long.parseLong(config.getProperty("TCPUpdateTime")) * 1000;
70			System.out.println("Configured TCPUpdateTime");
71	ab11	1.5	}
72			catch ( NumberFormatException e ){
73	ab11	1.7	System.out.println("The value for UDPUpdateTime is invalid, using a default");
74			// 10 mins
75			tcpcheckInterval = 10000 * 60; // 5 minutes
76	ab11	1.5	}
77
78			// the current time..
79			long currentTime = System.currentTimeMillis();
80			long nextUDP = currentTime + udpcheckInterval;
81			long nextTCP = currentTime + tcpcheckInterval;
82
83	ab11	1.2	while ( true ){
84	ab11	1.5	currentTime = System.currentTimeMillis();
85	ab11	1.2	// keep going for ever and ever ;)
86	ab11	1.5
87			if ( nextTCP < nextUDP ){
88	ab11	1.7	try {
89			long sleeptime = nextTCP - currentTime;
90			if ( sleeptime > 0 ){
91			Thread.sleep(sleeptime);
92			}
93			nextTCP += tcpcheckInterval;
94			// send a heartbeat
95			//System.out.println("Sending Heartbeat");
96	tdb	1.6	System.out.print("+");
97	ab11	1.7	config.sendHeartBeat();
98			if ( config.reloadConfig() ){
99			System.out.println("\nRestarting System");
100			break;
101			}
102			}
103			catch ( InterruptedException e ){
104			// do nothing
105			}
106	ab11	1.3	}
107	ab11	1.5	else {
108	ab11	1.7	try {
109			long sleeptime = nextUDP - currentTime;
110			if ( sleeptime > 0 ){
111			Thread.sleep(sleeptime);
112			}
113			nextUDP += udpcheckInterval;
114			// send a heartbeat
115			//System.out.println("Sending UDP Packet");
116			System.out.print(".");
117			LowLevelNet.sendUDPPacket(config, sysMon.getInfo());
118	ab11	1.5
119	ab11	1.7	}
120			catch ( InterruptedException e ){
121			// do nothing
122			}
123	ab11	1.5	}
124
125
126
127	ab11	1.3	} // while
128	ab11	1.2
129	ab11	1.3
130	ab11	1.2	} // public javahost
131
132
133			//---PUBLIC METHODS---
134
135			//---PRIVATE METHODS---
136
137			//---ACCESSOR/MUTATOR METHODS---
138
139			//---ATTRIBUTES---
140	ab11	1.5
141			private long udpcheckInterval;
142			private long tcpcheckInterval;
143			private final long defaultUpdateTime = 60000;
144
145	ab11	1.2
146			//---STATIC ATTRIBUTES---
147
148	tdb	1.6	} // class