server/clientinterface/TCPClientListener.java

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

//---IMPORTS---
import uk.ac.ukc.iscream.util.*;
import uk.ac.ukc.iscream.core.*;
import java.io.IOException;
import java.net.Socket;
import java.net.ServerSocket;
import java.net.InetAddress;
import java.net.UnknownHostException;

/**
 * Listener for incoming clients.
 * Creates a local implementation of the ClientHandler interface
 * and registers this with the ClientInterfaceServant. It then
 * returns a "reference" to this ClientHandler back to the client.
 *
 * @author  $Author: tdb1 $
 * @version $Id: ClientListener.java,v 1.1 2000/12/04 18:16:45 tdb1 Exp $
 */
class ClientListener extends Thread {

//---FINAL ATTRIBUTES---

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

//---CONSTRUCTORS---

        /**
     * Constructs a new ClientListener
     *
         * @param port The port that the server will listen on.
         * @param clit A reference to the ClientInterfaceServant.
         */
    public ClientListener(int port, ClientInterfaceServant cli) {
        _port = port;
        _cli = cli;
        _logger.write(toString(), Logger.SYSINIT, "started");
    }

//---PUBLIC METHODS---

        /**
         * The run() method is the main loop for this thread, and we
         * will remain in here until such a point as something goes
         * wrong with the listening. After initially setting up the
         * ServerSocket we go round a while loop receiving connections
         * and then passing them off to other processes to deal with.
         */
    public void run(){
        ServerSocket listenPort=null;
                // We use this boolean so we can break out of the while loop if we want
        boolean run = true;
        try{
                        // Setup the ServerSocket so that clients can connect
            listenPort = new ServerSocket(_port);
        }
        catch(IOException e){
        }
                // Log what machine/port we're listening on
                try{
                        _logger.write(toString(), Logger.SYSMSG, "ClientListener listening on "
                                                                                +InetAddress.getLocalHost().getHostName()
                                                                                +"/"+InetAddress.getLocalHost().getHostAddress()
                                                                                +" port "+listenPort.getLocalPort());
                }
                catch(UnknownHostException e){
                        _logger.write(toString(), Logger.SYSMSG, "ClientListener listening on UnknownHost "
                                                                                +"port "+listenPort.getLocalPort());
                }
                // Loop round constantly until we decide to stop
        while(run){
            Socket hostSocket=null;
            try{
                _logger.write(toString(), Logger.SYSMSG, "Waiting for Connection");
                                // This will block until a host connects - at which point we get a Socket
                hostSocket = listenPort.accept();
                _logger.write(toString(), Logger.SYSMSG, "Connection accepted from: " + hostSocket.toString());
            }
            catch(IOException e){
                                // Something went wrong with the ServerSocket, so we'll stop listening
                run=false;
            }
                        // If we've stopped on the line above we won't want to try this !
            if(run){
                                try {
                                    // Setup the HostInit so it can carry on communications with the host
                                    ClientHandler handler = new TCPClientHandler(hostSocket, _cli);
                                    // register it
                                    _cli.register(handler);
                                    // then we can leave here.... I trust handler won't go out of scope !
                } catch (IOException e) {
                    _logger.write(toString(), Logger.ERROR, e.toString());
                }
            }
        }
                // Best log the fact that we're stopping
        _logger.write(toString(), Logger.FATAL, "Fatal error, shutdown pending");
    }

    /**
     * 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---

//---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();

    /**
         * The port on which the server should listen.
         */
    private int _port;
    
    /**
         * A reference to the ClientInterfaceServant.
         */
    private ClientInterfaceServant _cli;

//---STATIC ATTRIBUTES---

}
Revision:	1.2
Committed:	Wed Dec 13 12:57:38 2000 UTC (23 years, 5 months ago) by ajm
Branch:	MAIN
Changes since 1.1:	+158 -140 lines
Log Message:	now componenterized also supports new toString standard
#	User	Rev	Content
1	ajm	1.2	//---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.core.*;
7			import java.io.IOException;
8			import java.net.Socket;
9			import java.net.ServerSocket;
10			import java.net.InetAddress;
11			import java.net.UnknownHostException;
12
13			/**
14			* Listener for incoming clients.
15			* Creates a local implementation of the ClientHandler interface
16			* and registers this with the ClientInterfaceServant. It then
17			* returns a "reference" to this ClientHandler back to the client.
18			*
19			* @author $Author: tdb1 $
20			* @version $Id: ClientListener.java,v 1.1 2000/12/04 18:16:45 tdb1 Exp $
21			*/
22			class ClientListener extends Thread {
23
24			//---FINAL ATTRIBUTES---
25
26			/**
27			* The current CVS revision of this class
28			*/
29			public final String REVISION = "$Revision: 1.1 $";
30
31			//---STATIC METHODS---
32
33			//---CONSTRUCTORS---
34
35			/**
36			* Constructs a new ClientListener
37			*
38			* @param port The port that the server will listen on.
39			* @param clit A reference to the ClientInterfaceServant.
40			*/
41			public ClientListener(int port, ClientInterfaceServant cli) {
42			_port = port;
43			_cli = cli;
44			_logger.write(toString(), Logger.SYSINIT, "started");
45			}
46
47			//---PUBLIC METHODS---
48
49			/**
50			* The run() method is the main loop for this thread, and we
51			* will remain in here until such a point as something goes
52			* wrong with the listening. After initially setting up the
53			* ServerSocket we go round a while loop receiving connections
54			* and then passing them off to other processes to deal with.
55			*/
56			public void run(){
57			ServerSocket listenPort=null;
58			// We use this boolean so we can break out of the while loop if we want
59			boolean run = true;
60			try{
61			// Setup the ServerSocket so that clients can connect
62			listenPort = new ServerSocket(_port);
63			}
64			catch(IOException e){
65			}
66			// Log what machine/port we're listening on
67			try{
68			_logger.write(toString(), Logger.SYSMSG, "ClientListener listening on "
69			+InetAddress.getLocalHost().getHostName()
70			+"/"+InetAddress.getLocalHost().getHostAddress()
71			+" port "+listenPort.getLocalPort());
72			}
73			catch(UnknownHostException e){
74			_logger.write(toString(), Logger.SYSMSG, "ClientListener listening on UnknownHost "
75			+"port "+listenPort.getLocalPort());
76			}
77			// Loop round constantly until we decide to stop
78			while(run){
79			Socket hostSocket=null;
80			try{
81			_logger.write(toString(), Logger.SYSMSG, "Waiting for Connection");
82			// This will block until a host connects - at which point we get a Socket
83			hostSocket = listenPort.accept();
84			_logger.write(toString(), Logger.SYSMSG, "Connection accepted from: " + hostSocket.toString());
85			}
86			catch(IOException e){
87			// Something went wrong with the ServerSocket, so we'll stop listening
88			run=false;
89			}
90			// If we've stopped on the line above we won't want to try this !
91			if(run){
92			try {
93			// Setup the HostInit so it can carry on communications with the host
94			ClientHandler handler = new TCPClientHandler(hostSocket, _cli);
95			// register it
96			_cli.register(handler);
97			// then we can leave here.... I trust handler won't go out of scope !
98			} catch (IOException e) {
99			_logger.write(toString(), Logger.ERROR, e.toString());
100			}
101			}
102			}
103			// Best log the fact that we're stopping
104			_logger.write(toString(), Logger.FATAL, "Fatal error, shutdown pending");
105			}
106
107			/**
108			* Overrides the {@link java.lang.Object#toString() Object.toString()}
109			* method to provide clean logging (every class should have this).
110			*
111			* This uses the uk.ac.ukc.iscream.util.NameFormat class
112			* to format the toString()
113			*
114			* @return the name of this class and its CVS revision
115			*/
116			public String toString() {
117			return FormatName.getName(
118			_name,
119			getClass().getName(),
120			REVISION);
121			}
122
123			//---PRIVATE METHODS---
124
125			//---ACCESSOR/MUTATOR METHODS---
126
127			//---ATTRIBUTES---
128
129			/**
130			* This is the friendly identifier of the
131			* component this class is running in.
132			* eg, a Filter may be called "filter1",
133			* If this class does not have an owning
134			* component, a name from the configuration
135			* can be placed here. This name could also
136			* be changed to null for utility classes.
137			*/
138			private String _name = ClientInterfaceMain.NAME;
139
140			/**
141			* This holds a reference to the
142			* system logger that is being used.
143			*/
144			private Logger _logger = ReferenceManager.getInstance().getLogger();
145
146			/**
147			* The port on which the server should listen.
148			*/
149			private int _port;
150
151			/**
152			* A reference to the ClientInterfaceServant.
153			*/
154			private ClientInterfaceServant _cli;
155
156			//---STATIC ATTRIBUTES---
157
158			}