server/filter/TCPReader.java

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

//---IMPORTS---
import uk.ac.ukc.iscream.core.*;
import uk.ac.ukc.iscream.filter.*;
import java.net.Socket;
import java.net.ServerSocket;
import java.io.OutputStream;
import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import org.omg.CORBA.*;
import org.omg.CosNaming.*;
import uk.ac.ukc.iscream.refman.*;

/**
 * A socket listener to listen for new hosts registering with the system.
 * When a host makes a connection, the connecton is past to an instance
 * of the HostInit class, which handles further communication.
 *
 * @author  $Author: tdb1 $
 * @version $Id: TCPReader.java,v 1.2 2000/11/29 19:26:00 tdb1 Exp $
 */
class TCPReader extends Thread {

//---FINAL ATTRIBUTES---

    /**
     * The current CVS revision of this class
     */
    public final String REVISION = "$Revision: 1.2 $";
    
//---STATIC METHODS---

//---CONSTRUCTORS---

        /**
     * Constructs a new listener
     *
     * @param logger a reference to the logger we are using
     * @param configManager a reference to the ConfigurationManager we are using
         * @param port The port that the server will listen on.
         */
    public TCPReader(int port, Filter parent) {
        _port = port;
        _parent = parent;
        _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, "TCPReader listening on "
                                                                                +InetAddress.getLocalHost().getHostName()
                                                                                +"/"+InetAddress.getLocalHost().getHostAddress()
                                                                                +" port "+listenPort.getLocalPort());
                }
                catch(UnknownHostException e){
                        _logger.write(toString(), Logger.SYSMSG, "TCPReader 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
                    TCPReaderInit init = new TCPReaderInit(hostSocket, _parent);
                                    // and start it
                    init.start();
                } 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).
     *
     * @return the name of this class and its CVS revision
     */
    public String toString() {
        return this.getClass().getName() + "(" + REVISION.substring(11, REVISION.length() - 2) + ")";
    }

//---PRIVATE METHODS---

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

//---ATTRIBUTES---
    
    /**
     * A reference to the logger the system is using
     */
    Logger _logger = ReferenceManager.getInstance().getLogger();
    
    /**
         * The port on which the server should listen.
         */
    private int _port;
    
    private Filter _parent;
    
//---STATIC ATTRIBUTES---

}
Revision:	1.3
Committed:	Thu Nov 30 02:00:54 2000 UTC (25 years ago) by tdb
Branch:	MAIN
Changes since 1.2:	+6 -12 lines
Log Message:	Changed all classes so that references to the Logger and ConfigurationManager are no longer passed around between classes. All of the classes now utilise the new ReferenceManager, which makes life much easier. Also tidied everything so that they all use the same conventions for attributes, namely the _ prefix to the name.
#	User	Rev	Content
1	tdb	1.1	//---PACKAGE DECLARATION---
2	tdb	1.2	package uk.ac.ukc.iscream.filter;
3	tdb	1.1
4			//---IMPORTS---
5			import uk.ac.ukc.iscream.core.*;
6			import uk.ac.ukc.iscream.filter.*;
7			import java.net.Socket;
8			import java.net.ServerSocket;
9			import java.io.OutputStream;
10			import java.io.IOException;
11			import java.net.InetAddress;
12			import java.net.UnknownHostException;
13			import org.omg.CORBA.*;
14			import org.omg.CosNaming.*;
15	tdb	1.3	import uk.ac.ukc.iscream.refman.*;
16	tdb	1.1
17			/**
18			* A socket listener to listen for new hosts registering with the system.
19			* When a host makes a connection, the connecton is past to an instance
20			* of the HostInit class, which handles further communication.
21			*
22	tdb	1.2	* @author $Author: tdb1 $
23	tdb	1.3	* @version $Id: TCPReader.java,v 1.2 2000/11/29 19:26:00 tdb1 Exp $
24	tdb	1.1	*/
25			class TCPReader extends Thread {
26
27			//---FINAL ATTRIBUTES---
28
29			/**
30			* The current CVS revision of this class
31			*/
32	tdb	1.3	public final String REVISION = "$Revision: 1.2 $";
33	tdb	1.1
34			//---STATIC METHODS---
35
36			//---CONSTRUCTORS---
37
38			/**
39			* Constructs a new listener
40			*
41			* @param logger a reference to the logger we are using
42			* @param configManager a reference to the ConfigurationManager we are using
43			* @param port The port that the server will listen on.
44			*/
45	tdb	1.3	public TCPReader(int port, Filter parent) {
46	tdb	1.1	_port = port;
47			_parent = parent;
48			_logger.write(toString(), Logger.SYSINIT, "started");
49			}
50
51
52
53			//---PUBLIC METHODS---
54
55			/**
56			* The run() method is the main loop for this thread, and we
57			* will remain in here until such a point as something goes
58			* wrong with the listening. After initially setting up the
59			* ServerSocket we go round a while loop receiving connections
60			* and then passing them off to other processes to deal with.
61			*/
62			public void run(){
63			ServerSocket listenPort=null;
64			// We use this boolean so we can break out of the while loop if we want
65			boolean run = true;
66			try{
67			// Setup the ServerSocket so that clients can connect
68			listenPort = new ServerSocket(_port);
69			}
70			catch(IOException e){
71			}
72			// Log what machine/port we're listening on
73			try{
74			_logger.write(toString(), Logger.SYSMSG, "TCPReader listening on "
75			+InetAddress.getLocalHost().getHostName()
76			+"/"+InetAddress.getLocalHost().getHostAddress()
77			+" port "+listenPort.getLocalPort());
78			}
79			catch(UnknownHostException e){
80			_logger.write(toString(), Logger.SYSMSG, "TCPReader listening on UnknownHost "
81			+"port "+listenPort.getLocalPort());
82			}
83			// Loop round constantly until we decide to stop
84			while(run){
85			Socket hostSocket=null;
86			try{
87			_logger.write(toString(), Logger.SYSMSG, "Waiting for Connection");
88			// This will block until a host connects - at which point we get a Socket
89			hostSocket = listenPort.accept();
90			_logger.write(toString(), Logger.SYSMSG, "Connection accepted from: " + hostSocket.toString());
91			}
92			catch(IOException e){
93			// Something went wrong with the ServerSocket, so we'll stop listening
94			run=false;
95			}
96			// If we've stopped on the line above we won't want to try this !
97			if(run){
98			try {
99			// Setup the HostInit so it can carry on communications with the host
100	tdb	1.3	TCPReaderInit init = new TCPReaderInit(hostSocket, _parent);
101	tdb	1.1	// and start it
102			init.start();
103			} catch (IOException e) {
104			_logger.write(toString(), Logger.ERROR, e.toString());
105			}
106			}
107			}
108			// Best log the fact that we're stopping
109			_logger.write(toString(), Logger.FATAL, "Fatal error, shutdown pending");
110			}
111
112			/**
113			* Overrides the {@link java.lang.Object#toString() Object.toString()}
114			* method to provide clean logging (every class should have this).
115			*
116			* @return the name of this class and its CVS revision
117			*/
118			public String toString() {
119			return this.getClass().getName() + "(" + REVISION.substring(11, REVISION.length() - 2) + ")";
120			}
121
122			//---PRIVATE METHODS---
123
124			//---ACCESSOR/MUTATOR METHODS---
125
126			//---ATTRIBUTES---
127
128			/**
129			* A reference to the logger the system is using
130			*/
131	tdb	1.3	Logger _logger = ReferenceManager.getInstance().getLogger();
132	tdb	1.1
133			/**
134			* The port on which the server should listen.
135			*/
136			private int _port;
137
138			private Filter _parent;
139
140			//---STATIC ATTRIBUTES---
141
142			}