host/java/SystemMonitor.java

//---PACKAGE DECLARATION---

//---IMPORTS---

import java.util.Random;

/**
 * Gathers system information then outputs it as XML
 * Collects data based on properties gained from the configurator
 * then packages these up using XMLFormatter and outputs them if
 * the timeout has passed.
 *
 * @author  $Author: ab11 $
 * @version $Id: SystemMonitor.java,v 1.3 2000/11/30 04:11:00 ab11 Exp $
 */
class SystemMonitor {

//---FINAL ATTRIBUTES---

//---STATIC METHODS---

//---CONSTRUCTORS---

/**
 * Public constructor for the class. Takes in a Config object to gain its
 * properties from.
 *
 */   
 public SystemMonitor( Config config ){
        // create a new instace, get the info we need out of config
        // like things to monitor
        
        lastCheck = System.currentTimeMillis();
        sequence = 0;


        // why oh why wont ultra edit let me put Long in the next line? oh its trying to 
        // correct keywords =|
        try {
                udpcheckInterval = Long.parseLong(config.getProperty("UDPUpdateTime")) * 1000;
        }
        catch ( NumberFormatException e ){
                System.out.println("The value for UDPUpdateTime is invalid, using a default");
                // 5 mins
                udpcheckInterval = 5000 * 60;
        }
        // make the check interval into seconds
        
    }

//---PUBLIC METHODS---

   /**
    * Gathers system information and will black until the timeout has passed.
    *
    * @return the system information in an XML packet
    */
    public String getInfo(){
        // called to retrieve the stored averages and output them as a XML string
        XMLFormatter xml = new XMLFormatter("packet");
        
        Random rand = new Random();
        
        // just send some dummy info for now.
        xml.addNest("packet_info");
            String currentTime = Long.toString(System.currentTimeMillis());
            xml.addElement("date_time", currentTime );
            xml.addElement("sequence", Integer.toString(sequence));
        xml.closeNest();
        xml.addNest("core");
            xml.addElement("cpu",""+rand.nextInt(100));
            xml.addElement("memory",""+rand.nextInt(100));
        xml.closeNest();
        if ( rand.nextBoolean() ){ 
                xml.addNest("additional");
                    xml.addElement("users",""+rand.nextInt(30));
                xml.closeNest();
        }
        // MUST FIX THIS..!!!!
        try {
                long updateIn = ( lastCheck + udpcheckInterval )-System.currentTimeMillis();
                if ( updateIn > 0 ){
                        Thread.sleep(updateIn);
                }
                else
                { 
                        Thread.sleep(defaultUpdateTime);
                }
        }
        catch( InterruptedException e ){
                System.out.println("Sleep interrupted");
        }
        
        // increment sequence.
        sequence++;
        lastCheck = System.currentTimeMillis();
                
        // finally return a string 
        return xml.returnXML();
    } // getinfo()
    
//---PRIVATE METHODS---

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

//---ATTRIBUTES---

    private long lastCheck;
    private int sequence;
    private long udpcheckInterval;
    private final long defaultUpdateTime = 60000;

//---STATIC ATTRIBUTES---

} // class
Revision:	1.4
Committed:	Thu Nov 30 17:33:36 2000 UTC (23 years, 9 months ago) by ab11
Branch:	MAIN
Changes since 1.3:	+19 -4 lines
Log Message:	Added some extra error checking so that Hosts don't bomb with Thread.sleep errors (when it was negative). If the wait time is negative then the default override time is used (1 min)
#	User	Rev	Content
1	ab11	1.2	//---PACKAGE DECLARATION---
2
3			//---IMPORTS---
4
5	ab11	1.3	import java.util.Random;
6
7	ab11	1.2	/**
8			* Gathers system information then outputs it as XML
9			* Collects data based on properties gained from the configurator
10			* then packages these up using XMLFormatter and outputs them if
11			* the timeout has passed.
12			*
13			* @author $Author: ab11 $
14	ab11	1.4	* @version $Id: SystemMonitor.java,v 1.3 2000/11/30 04:11:00 ab11 Exp $
15	ab11	1.2	*/
16	ab11	1.1	class SystemMonitor {
17
18	ab11	1.2	//---FINAL ATTRIBUTES---
19
20			//---STATIC METHODS---
21
22			//---CONSTRUCTORS---
23
24			/**
25			* Public constructor for the class. Takes in a Config object to gain its
26			* properties from.
27			*
28			*/
29			public SystemMonitor( Config config ){
30			// create a new instace, get the info we need out of config
31			// like things to monitor
32
33			lastCheck = System.currentTimeMillis();
34			sequence = 0;
35
36
37			// why oh why wont ultra edit let me put Long in the next line? oh its trying to
38			// correct keywords =\|
39	ab11	1.4	try {
40			udpcheckInterval = Long.parseLong(config.getProperty("UDPUpdateTime")) * 1000;
41			}
42			catch ( NumberFormatException e ){
43			System.out.println("The value for UDPUpdateTime is invalid, using a default");
44			// 5 mins
45			udpcheckInterval = 5000 * 60;
46			}
47	ab11	1.3	// make the check interval into seconds
48	ab11	1.2
49			}
50
51			//---PUBLIC METHODS---
52
53			/**
54			* Gathers system information and will black until the timeout has passed.
55			*
56			* @return the system information in an XML packet
57			*/
58			public String getInfo(){
59			// called to retrieve the stored averages and output them as a XML string
60			XMLFormatter xml = new XMLFormatter("packet");
61
62	ab11	1.3	Random rand = new Random();
63
64	ab11	1.2	// just send some dummy info for now.
65			xml.addNest("packet_info");
66			String currentTime = Long.toString(System.currentTimeMillis());
67			xml.addElement("date_time", currentTime );
68			xml.addElement("sequence", Integer.toString(sequence));
69			xml.closeNest();
70			xml.addNest("core");
71	ab11	1.3	xml.addElement("cpu",""+rand.nextInt(100));
72			xml.addElement("memory",""+rand.nextInt(100));
73	ab11	1.2	xml.closeNest();
74	ab11	1.3	if ( rand.nextBoolean() ){
75			xml.addNest("additional");
76			xml.addElement("users",""+rand.nextInt(30));
77			xml.closeNest();
78			}
79	ab11	1.2	// MUST FIX THIS..!!!!
80	ab11	1.3	try {
81	ab11	1.4	long updateIn = ( lastCheck + udpcheckInterval )-System.currentTimeMillis();
82			if ( updateIn > 0 ){
83			Thread.sleep(updateIn);
84			}
85			else
86			{
87			Thread.sleep(defaultUpdateTime);
88			}
89	ab11	1.3	}
90			catch( InterruptedException e ){
91			System.out.println("Sleep interrupted");
92	ab11	1.2	}
93
94			// increment sequence.
95			sequence++;
96	ab11	1.3	lastCheck = System.currentTimeMillis();
97	ab11	1.2
98			// finally return a string
99			return xml.returnXML();
100			} // getinfo()
101
102			//---PRIVATE METHODS---
103
104			//---ACCESSOR/MUTATOR METHODS---
105
106			//---ATTRIBUTES---
107	ab11	1.1
108			private long lastCheck;
109			private int sequence;
110	ab11	1.4	private long udpcheckInterval;
111			private final long defaultUpdateTime = 60000;
112	ab11	1.2
113			//---STATIC ATTRIBUTES---
114	ab11	1.1
115			} // class