server/clientinterface/PacketSorter.java

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

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

/**
 * Receives data from the incoming CORBA servant, places
 * it in a Queue, and then arranges distribution to the
 * ClientHandlers.
 *
 * @author  $Author: tdb1 $
 * @version $Id: PacketSorter.java,v 1.1 2001/01/23 16:55:23 tdb1 Exp $
 */
class PacketSorter extends Thread {

//---FINAL ATTRIBUTES---

    /**
     * The current CVS revision of this class
     */
    public final String REVISION = "$Revision: 1.1 $";
    
//---STATIC METHODS---

//---CONSTRUCTORS---

    /**
     * Creates a new PacketSorter.
     */
    public PacketSorter() {
        _queue = new Queue();
        _hostMap = new HashMap();
        _allHostsList = new LinkedList();
        _logger.write(toString(), Logger.SYSINIT, "created");
    }
    
//---PUBLIC METHODS---

    public void run() {
        int qID = _queue.getQueue();
        while(true) {
            String xml = "";
            try {
                xml = (String) _queue.get(qID);
            }
            catch(InvalidQueueException e) {
                _logger.write(toString(), Logger.ERROR, "Queue failure: "+e);
            }
            
            // look at host map
            
            // should be a neater way to do this
            XMLPacket packet = new XMLPacketMaker(xml).createXMLPacket();
            String host = packet.getParam("packet.attributes.machine_name");
            LinkedList list = (LinkedList) _hostMap.get(host);
            
            Iterator i = list.iterator();
            while(i.hasNext()) {
                ((Queue) i.next()).add(xml);
            }
            
            //  look at all hosts
            
            Iterator j = _allHostsList.iterator();
            while(j.hasNext()) {
                ((Queue) j.next()).add(xml);
            }
        }
    }
    
    // MUST DEAL WITH hostList="" implying "all hosts"
    
    public void register(Queue dhQueue, String hostList) {
        if(hostList.equals("")) {
            _allHostsList.add(dhQueue);
            _logger.write(toString(), Logger.SYSMSG, "registered DataHandler for all hosts");
        }
        else {
            StringTokenizer st = new StringTokenizer(hostList, ";");
            while(st.hasMoreTokens()) {
                String host = st.nextToken();
                if(_hostMap.containsKey(host)) {
                    LinkedList list = (LinkedList) _hostMap.get(host);
                    list.add(dhQueue);
                }
                else {
                    LinkedList list = new LinkedList();
                    list.add(dhQueue);
                    _hostMap.put(host, list);
                }
            }
            _logger.write(toString(), Logger.SYSMSG, "registered DataHandler for hosts: "+hostList);
        }
    }
    
    public void deregister(Queue dhQueue, String hostList) {
        if(hostList.equals("")) {
            _allHostsList.remove(dhQueue);
            _logger.write(toString(), Logger.SYSMSG, "deregistered DataHandler for all hosts");
        }
        else {
            StringTokenizer st = new StringTokenizer(hostList, ";");
            while(st.hasMoreTokens()) {
                String host = st.nextToken();
                if(_hostMap.containsKey(host)) {
                    LinkedList list = (LinkedList) _hostMap.get(host);
                    list.remove(dhQueue);
                    if(list.size()==0) {
                        _hostMap.remove(host);
                    }
                }
            }
            _logger.write(toString(), Logger.SYSMSG, "deregistered DataHandler for hosts: "+hostList);
        }
    }
    
    /**
     * 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.NameFormat 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---

    public Queue getQueue() {
        return _queue;
    }

//---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 = ClientInterfaceMain.NAME;

    /**
     * This holds a reference to the
     * system logger that is being used.
     */
    private Logger _logger = ReferenceManager.getInstance().getLogger();
    
    private Queue _queue;
    
    private HashMap _hostMap;
    private LinkedList _allHostsList;
    
//---STATIC ATTRIBUTES---

}
Revision:	1.2
Committed:	Tue Jan 23 17:22:01 2001 UTC (23 years, 3 months ago) by tdb
Branch:	MAIN
Changes since 1.1:	+46 -23 lines
Log Message:	Now supports "all hosts".
#	User	Rev	Content
1	tdb	1.1	//---PACKAGE DECLARATION---
2			package uk.ac.ukc.iscream.clientinterface;
3
4			//---IMPORTS---
5			import uk.ac.ukc.iscream.util.*;
6			import uk.ac.ukc.iscream.componentmanager.*;
7			import uk.ac.ukc.iscream.core.*;
8			import java.util.*;
9
10			/**
11			* Receives data from the incoming CORBA servant, places
12			* it in a Queue, and then arranges distribution to the
13			* ClientHandlers.
14			*
15	tdb	1.2	* @author $Author: tdb1 $
16			* @version $Id: PacketSorter.java,v 1.1 2001/01/23 16:55:23 tdb1 Exp $
17	tdb	1.1	*/
18			class PacketSorter extends Thread {
19
20			//---FINAL ATTRIBUTES---
21
22			/**
23			* The current CVS revision of this class
24			*/
25			public final String REVISION = "$Revision: 1.1 $";
26
27			//---STATIC METHODS---
28
29			//---CONSTRUCTORS---
30
31			/**
32			* Creates a new PacketSorter.
33			*/
34			public PacketSorter() {
35			_queue = new Queue();
36			_hostMap = new HashMap();
37	tdb	1.2	_allHostsList = new LinkedList();
38	tdb	1.1	_logger.write(toString(), Logger.SYSINIT, "created");
39			}
40
41			//---PUBLIC METHODS---
42
43			public void run() {
44			int qID = _queue.getQueue();
45			while(true) {
46			String xml = "";
47			try {
48			xml = (String) _queue.get(qID);
49			}
50			catch(InvalidQueueException e) {
51			_logger.write(toString(), Logger.ERROR, "Queue failure: "+e);
52			}
53
54	tdb	1.2	// look at host map
55
56	tdb	1.1	// should be a neater way to do this
57			XMLPacket packet = new XMLPacketMaker(xml).createXMLPacket();
58			String host = packet.getParam("packet.attributes.machine_name");
59			LinkedList list = (LinkedList) _hostMap.get(host);
60
61			Iterator i = list.iterator();
62			while(i.hasNext()) {
63			((Queue) i.next()).add(xml);
64			}
65	tdb	1.2
66			// look at all hosts
67
68			Iterator j = _allHostsList.iterator();
69			while(j.hasNext()) {
70			((Queue) j.next()).add(xml);
71			}
72	tdb	1.1	}
73			}
74
75			// MUST DEAL WITH hostList="" implying "all hosts"
76
77			public void register(Queue dhQueue, String hostList) {
78	tdb	1.2	if(hostList.equals("")) {
79			_allHostsList.add(dhQueue);
80			_logger.write(toString(), Logger.SYSMSG, "registered DataHandler for all hosts");
81			}
82			else {
83			StringTokenizer st = new StringTokenizer(hostList, ";");
84			while(st.hasMoreTokens()) {
85			String host = st.nextToken();
86			if(_hostMap.containsKey(host)) {
87			LinkedList list = (LinkedList) _hostMap.get(host);
88			list.add(dhQueue);
89			}
90			else {
91			LinkedList list = new LinkedList();
92			list.add(dhQueue);
93			_hostMap.put(host, list);
94			}
95	tdb	1.1	}
96	tdb	1.2	_logger.write(toString(), Logger.SYSMSG, "registered DataHandler for hosts: "+hostList);
97	tdb	1.1	}
98			}
99
100			public void deregister(Queue dhQueue, String hostList) {
101	tdb	1.2	if(hostList.equals("")) {
102			_allHostsList.remove(dhQueue);
103			_logger.write(toString(), Logger.SYSMSG, "deregistered DataHandler for all hosts");
104			}
105			else {
106			StringTokenizer st = new StringTokenizer(hostList, ";");
107			while(st.hasMoreTokens()) {
108			String host = st.nextToken();
109			if(_hostMap.containsKey(host)) {
110			LinkedList list = (LinkedList) _hostMap.get(host);
111			list.remove(dhQueue);
112			if(list.size()==0) {
113			_hostMap.remove(host);
114			}
115	tdb	1.1	}
116			}
117	tdb	1.2	_logger.write(toString(), Logger.SYSMSG, "deregistered DataHandler for hosts: "+hostList);
118	tdb	1.1	}
119			}
120
121			/**
122			* Overrides the {@link java.lang.Object#toString() Object.toString()}
123			* method to provide clean logging (every class should have this).
124			*
125			* This uses the uk.ac.ukc.iscream.util.NameFormat class
126			* to format the toString()
127			*
128			* @return the name of this class and its CVS revision
129			*/
130			public String toString() {
131			return FormatName.getName(
132			_name,
133			getClass().getName(),
134			REVISION);
135			}
136
137			//---PRIVATE METHODS---
138
139			//---ACCESSOR/MUTATOR METHODS---
140
141			public Queue getQueue() {
142			return _queue;
143			}
144
145			//---ATTRIBUTES---
146
147			/**
148			* This is the friendly identifier of the
149			* component this class is running in.
150			* eg, a Filter may be called "filter1",
151			* If this class does not have an owning
152			* component, a name from the configuration
153			* can be placed here. This name could also
154			* be changed to null for utility classes.
155			*/
156			private String _name = ClientInterfaceMain.NAME;
157
158			/**
159			* This holds a reference to the
160			* system logger that is being used.
161			*/
162			private Logger _logger = ReferenceManager.getInstance().getLogger();
163
164			private Queue _queue;
165
166			private HashMap _hostMap;
167	tdb	1.2	private LinkedList _allHostsList;
168	tdb	1.1
169			//---STATIC ATTRIBUTES---
170
171			}