server/filter/TCPReader.java

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

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

/**
 * 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 1.6 2001/01/12 00:45:25 tdb1 Exp $
 */
class TCPReader extends Thread {

//---FINAL ATTRIBUTES---

    /**
     * The current CVS revision of this class
     */
    public final String REVISION = "$Revision: 1.6 $";
    
//---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, Queue queue) {
        _port = port;
        _queue = queue;
        _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, _queue);
                                    // 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).
     *
     * 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 = FilterMain.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;
    
    private Queue _queue;
    
//---STATIC ATTRIBUTES---

}
Revision:	1.7
Committed:	Thu Jan 18 23:15:50 2001 UTC (23 years, 4 months ago) by tdb
Branch:	MAIN
Changes since 1.6:	+4 -3 lines
Log Message:	Changes to reflect move of Component, ComponentStartException, and the ReferenceManager from util to componentmanager.
#	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	tdb	1.7	import uk.ac.ukc.iscream.componentmanager.*;
7	tdb	1.1	import uk.ac.ukc.iscream.filter.*;
8			import java.net.Socket;
9			import java.net.ServerSocket;
10			import java.io.OutputStream;
11			import java.io.IOException;
12			import java.net.InetAddress;
13			import java.net.UnknownHostException;
14	ajm	1.4	import uk.ac.ukc.iscream.util.*;
15	tdb	1.1
16			/**
17			* A socket listener to listen for new hosts registering with the system.
18			* When a host makes a connection, the connecton is past to an instance
19			* of the HostInit class, which handles further communication.
20			*
21	tdb	1.7	* @author $Author: tdb1 $
22			* @version $Id: TCPReader.java,v 1.6 2001/01/12 00:45:25 tdb1 Exp $
23	tdb	1.1	*/
24			class TCPReader extends Thread {
25
26			//---FINAL ATTRIBUTES---
27
28			/**
29			* The current CVS revision of this class
30			*/
31	tdb	1.7	public final String REVISION = "$Revision: 1.6 $";
32	tdb	1.1
33			//---STATIC METHODS---
34
35			//---CONSTRUCTORS---
36
37			/**
38			* Constructs a new listener
39			*
40			* @param logger a reference to the logger we are using
41			* @param configManager a reference to the ConfigurationManager we are using
42			* @param port The port that the server will listen on.
43			*/
44	tdb	1.6	public TCPReader(int port, Queue queue) {
45	tdb	1.1	_port = port;
46	tdb	1.6	_queue = queue;
47	tdb	1.1	_logger.write(toString(), Logger.SYSINIT, "started");
48			}
49
50
51
52			//---PUBLIC METHODS---
53
54			/**
55			* The run() method is the main loop for this thread, and we
56			* will remain in here until such a point as something goes
57			* wrong with the listening. After initially setting up the
58			* ServerSocket we go round a while loop receiving connections
59			* and then passing them off to other processes to deal with.
60			*/
61			public void run(){
62			ServerSocket listenPort=null;
63			// We use this boolean so we can break out of the while loop if we want
64			boolean run = true;
65			try{
66			// Setup the ServerSocket so that clients can connect
67			listenPort = new ServerSocket(_port);
68			}
69			catch(IOException e){
70			}
71			// Log what machine/port we're listening on
72			try{
73			_logger.write(toString(), Logger.SYSMSG, "TCPReader listening on "
74			+InetAddress.getLocalHost().getHostName()
75			+"/"+InetAddress.getLocalHost().getHostAddress()
76			+" port "+listenPort.getLocalPort());
77			}
78			catch(UnknownHostException e){
79			_logger.write(toString(), Logger.SYSMSG, "TCPReader listening on UnknownHost "
80			+"port "+listenPort.getLocalPort());
81			}
82			// Loop round constantly until we decide to stop
83			while(run){
84			Socket hostSocket=null;
85			try{
86			_logger.write(toString(), Logger.SYSMSG, "Waiting for Connection");
87			// This will block until a host connects - at which point we get a Socket
88			hostSocket = listenPort.accept();
89			_logger.write(toString(), Logger.SYSMSG, "Connection accepted from: " + hostSocket.toString());
90			}
91			catch(IOException e){
92			// Something went wrong with the ServerSocket, so we'll stop listening
93			run=false;
94			}
95			// If we've stopped on the line above we won't want to try this !
96			if(run){
97			try {
98			// Setup the HostInit so it can carry on communications with the host
99	tdb	1.6	TCPReaderInit init = new TCPReaderInit(hostSocket, _queue);
100	tdb	1.1	// and start it
101			init.start();
102			} catch (IOException e) {
103			_logger.write(toString(), Logger.ERROR, e.toString());
104			}
105			}
106			}
107			// Best log the fact that we're stopping
108			_logger.write(toString(), Logger.FATAL, "Fatal error, shutdown pending");
109			}
110
111			/**
112			* Overrides the {@link java.lang.Object#toString() Object.toString()}
113			* method to provide clean logging (every class should have this).
114			*
115	ajm	1.5	* This uses the uk.ac.ukc.iscream.util.NameFormat class
116			* to format the toString()
117			*
118	tdb	1.1	* @return the name of this class and its CVS revision
119			*/
120			public String toString() {
121	ajm	1.5	return FormatName.getName(
122			_name,
123			getClass().getName(),
124			REVISION);
125	tdb	1.1	}
126
127			//---PRIVATE METHODS---
128
129			//---ACCESSOR/MUTATOR METHODS---
130
131			//---ATTRIBUTES---
132
133			/**
134	ajm	1.5	* This is the friendly identifier of the
135			* component this class is running in.
136			* eg, a Filter may be called "filter1",
137			* If this class does not have an owning
138			* component, a name from the configuration
139			* can be placed here. This name could also
140			* be changed to null for utility classes.
141			*/
142			private String _name = FilterMain.NAME;
143
144			/**
145			* This holds a reference to the
146			* system logger that is being used.
147	tdb	1.1	*/
148	ajm	1.5	private Logger _logger = ReferenceManager.getInstance().getLogger();
149	tdb	1.1
150			/**
151			* The port on which the server should listen.
152			*/
153			private int _port;
154
155	tdb	1.6	private Queue _queue;
156	tdb	1.1
157			//---STATIC ATTRIBUTES---
158
159			}