cms/util/QueueMonitor.java

//---PACKAGE DECLARATION---
package uk.ac.ukc.iscream.util;

//---IMPORTS---
import uk.ac.ukc.iscream.util.*;

/**
 * This class monitors a given Queue at regular intervals,
 * reporting back to a Queue with XML - this could be the
 * same Queue being monitored.
 *
 * @author  $Author: tdb1 $
 * @version $Id: QueueMonitor.java,v 1.4 2001/02/28 19:02:22 tdb1 Exp $
 */
class QueueMonitor extends Thread {

//---FINAL ATTRIBUTES---

    /**
     * The current CVS revision of this class
     */
    public static final String REVISION = "$Revision: 1.4 $";
    
//---STATIC METHODS---

//---CONSTRUCTORS---
    
    /**
     * Construct a new QueueMonitor.
     *
     * @param sourceQueue The Queue to monitor
     * @param destQueue The Queue to monitor to
     * @param interval The interval, in milliseconds, at which to sample
     * @param name A name to identify the source Queue with
     */
    public QueueMonitor (Queue sourceQueue, Queue destQueue, long interval, String name) {
        _sourceQueue = sourceQueue;
        _destQueue = destQueue;
        _interval = interval;
        _srcName = name;
    }

//---PUBLIC METHODS---
    
    /**
     * Loops continuosly polling our source Queue at
     * the given interval, and then logging the results
     * in the destination Queue.
     */
    public void run() {
        _run = true;
        // so we can stop this thread...
        while(_run) {
            // first sleep for our interval
            try { Thread.sleep(_interval); } catch(Exception e) {}
            // check the Queue
            String status = _sourceQueue.xmlStatus();
            // get a hash of our Queue (for identification)
            String hashCode = String.valueOf(_sourceQueue.hashCode());
            // create some XML
            String date = new Long(System.currentTimeMillis()/((long) 1000)).toString();
            String xml = "<packet type=\"queueStat\" date=\""+date+"\" name=\""+_srcName+"\" hashCode=\""+hashCode+"\">" + status + "</packet>";
            // write XML to destination Queue
            _destQueue.add(xml);
        }
    }
    
    /**
     * Shuts down this QueueMonitor
     */
    public void shutdown() {
        // this will stop the main loop
        _run = false;
        // get a hash of our Queue (for identification)
        String hashCode = String.valueOf(_sourceQueue.hashCode());
        // create some XML
        String date = new Long(System.currentTimeMillis()/((long) 1000)).toString();
        String xml = "<packet type=\"queueStat\" date=\""+date+"\" name=\""+_srcName+"\" hashCode=\""+hashCode+"\" shutdown=\"true\"></packet>";
        // write XML to destination Queue
        _destQueue.add(xml);
    }
    
    /**
     * Overrides the {@link java.lang.Object#toString() Object.toString()}
     * method to provide clean logging (every class should have this).
     *
     * This uses the uk.ac.ukc.iscream.util.FormatName class
     * to format the toString()
     *
     * @return the name of this class and its CVS revision
     */
    public String toString() {
        return FormatName.getName(
            _name,
            getClass().getName(),
            REVISION);
    }

//---PRIVATE METHODS---

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

//---ATTRIBUTES---

    /**
     * This is the friendly identifier of the
     * component this class is running in.
     * eg, a Filter may be called "filter1",
     * If this class does not have an owning
     * component,  a name from the configuration
     * can be placed here.  This name could also
     * be changed to null for utility classes.
     */
    private String _name = null;
    
    /**
     * The Queue we're monitoring.
     */
    private Queue _sourceQueue;
    
    /**
     * The Queue we'll output results to.
     */
    private Queue _destQueue;
    
    /**
     * The interval at which we'll check the
     * sourceQueue status.
     */
    private long _interval;
    
    /**
     * The name to identify the source Queue
     */
    private String _srcName;
    
    /**
     * Allows us to stop the main loop cleanly.
     */
    private boolean _run;
    
//---STATIC ATTRIBUTES---

}
Revision:	1.5
Committed:	Thu Mar 1 15:46:23 2001 UTC (23 years, 2 months ago) by tdb
Branch:	MAIN
Changes since 1.4:	+5 -3 lines
Log Message:	Now send the hashCode in the QueueMonitor shutdown packets.
#	User	Rev	Content
1	tdb	1.1	//---PACKAGE DECLARATION---
2			package uk.ac.ukc.iscream.util;
3
4			//---IMPORTS---
5			import uk.ac.ukc.iscream.util.*;
6
7			/**
8			* This class monitors a given Queue at regular intervals,
9			* reporting back to a Queue with XML - this could be the
10			* same Queue being monitored.
11			*
12	tdb	1.2	* @author $Author: tdb1 $
13	tdb	1.5	* @version $Id: QueueMonitor.java,v 1.4 2001/02/28 19:02:22 tdb1 Exp $
14	tdb	1.1	*/
15			class QueueMonitor extends Thread {
16
17			//---FINAL ATTRIBUTES---
18
19			/**
20			* The current CVS revision of this class
21			*/
22	tdb	1.5	public static final String REVISION = "$Revision: 1.4 $";
23	tdb	1.1
24			//---STATIC METHODS---
25
26			//---CONSTRUCTORS---
27
28			/**
29			* Construct a new QueueMonitor.
30			*
31			* @param sourceQueue The Queue to monitor
32			* @param destQueue The Queue to monitor to
33			* @param interval The interval, in milliseconds, at which to sample
34			* @param name A name to identify the source Queue with
35			*/
36			public QueueMonitor (Queue sourceQueue, Queue destQueue, long interval, String name) {
37			_sourceQueue = sourceQueue;
38			_destQueue = destQueue;
39			_interval = interval;
40			_srcName = name;
41			}
42
43			//---PUBLIC METHODS---
44
45			/**
46			* Loops continuosly polling our source Queue at
47			* the given interval, and then logging the results
48			* in the destination Queue.
49			*/
50			public void run() {
51			_run = true;
52			// so we can stop this thread...
53			while(_run) {
54			// first sleep for our interval
55			try { Thread.sleep(_interval); } catch(Exception e) {}
56			// check the Queue
57			String status = _sourceQueue.xmlStatus();
58	tdb	1.4	// get a hash of our Queue (for identification)
59			String hashCode = String.valueOf(_sourceQueue.hashCode());
60	tdb	1.1	// create some XML
61			String date = new Long(System.currentTimeMillis()/((long) 1000)).toString();
62	tdb	1.4	String xml = "<packet type=\"queueStat\" date=\""+date+"\" name=\""+_srcName+"\" hashCode=\""+hashCode+"\">" + status + "</packet>";
63	tdb	1.1	// write XML to destination Queue
64			_destQueue.add(xml);
65			}
66			}
67
68			/**
69			* Shuts down this QueueMonitor
70			*/
71			public void shutdown() {
72			// this will stop the main loop
73			_run = false;
74	tdb	1.5	// get a hash of our Queue (for identification)
75			String hashCode = String.valueOf(_sourceQueue.hashCode());
76	tdb	1.3	// create some XML
77			String date = new Long(System.currentTimeMillis()/((long) 1000)).toString();
78	tdb	1.5	String xml = "<packet type=\"queueStat\" date=\""+date+"\" name=\""+_srcName+"\" hashCode=\""+hashCode+"\" shutdown=\"true\"></packet>";
79	tdb	1.3	// write XML to destination Queue
80			_destQueue.add(xml);
81	tdb	1.1	}
82
83			/**
84			* Overrides the {@link java.lang.Object#toString() Object.toString()}
85			* method to provide clean logging (every class should have this).
86			*
87			* This uses the uk.ac.ukc.iscream.util.FormatName class
88			* to format the toString()
89			*
90			* @return the name of this class and its CVS revision
91			*/
92			public String toString() {
93			return FormatName.getName(
94			_name,
95			getClass().getName(),
96			REVISION);
97			}
98
99			//---PRIVATE METHODS---
100
101			//---ACCESSOR/MUTATOR METHODS---
102
103			//---ATTRIBUTES---
104
105			/**
106			* This is the friendly identifier of the
107			* component this class is running in.
108			* eg, a Filter may be called "filter1",
109			* If this class does not have an owning
110			* component, a name from the configuration
111			* can be placed here. This name could also
112			* be changed to null for utility classes.
113			*/
114			private String _name = null;
115
116			/**
117			* The Queue we're monitoring.
118			*/
119			private Queue _sourceQueue;
120
121			/**
122			* The Queue we'll output results to.
123			*/
124			private Queue _destQueue;
125
126			/**
127			* The interval at which we'll check the
128			* sourceQueue status.
129			*/
130			private long _interval;
131
132			/**
133			* The name to identify the source Queue
134			*/
135			private String _srcName;
136
137			/**
138			* Allows us to stop the main loop cleanly.
139			*/
140			private boolean _run;
141
142			//---STATIC ATTRIBUTES---
143
144			}