cms/conient/ConnectionHandler.java

import uk.ac.ukc.iscream.util.*;
import java.io.*;
import java.net.*;
import javax.swing.JOptionPane;

public class ConnectionHandler extends Thread {

    public final String PROTOCOL_VERSION = "PROTOCOL 1.0";

    public static final int DONOTHING = 0;
    public static final int CONNECT = 1;
    public static final int STARTDATA = 2;
    public static final int STOPDATA = 3;
    public static final int DISCONNECT = 4;

    public ConnectionHandler(DataPanel data, Queue actionQueue) {
        _data = data;
        _actionQueue = actionQueue;
        _myQueue = _actionQueue.getQueue();
    }
    
    public void run() {
               
        while(true) {
            // we wait for a call...
            int action = 0;
            try {
                action = ((Integer) _actionQueue.get(_myQueue)).intValue();
            } catch (InvalidQueueException e) {
                // we 're never going to get this...
            }
            
            // examine our action...
            // if it was to connect...then we connect...
            switch(action) {
                case CONNECT:
                
                    Object serverQuestion = null;
                    serverQuestion = JOptionPane.showInputDialog(null, "Please enter the name of a server running the I-Scream client interface:", "I-Scream Server", JOptionPane.INFORMATION_MESSAGE);
                    if (serverQuestion instanceof String) {
                        _server = (String) serverQuestion;
                        SwingClient.setStatus("Connecting to - " + _server);
                        try {
                            _controlLink = new Socket(_server, _port);
                            _inBound = new BufferedReader(new InputStreamReader(_controlLink.getInputStream()));
                            _outBound = new PrintWriter(_controlLink.getOutputStream());
                            SwingClient.setStatus("Connection Established - " + _server);
                            String response;
                            response = _inBound.readLine();
                            if (!response.equals(PROTOCOL_VERSION)) {
                                throw new IOException("invalid protocol version");
                            }
                            SwingClient.addMessage("Handshake Success - " + PROTOCOL_VERSION);
                            
                            // send the name - get from somewhere eventually
                            _outBound.println(_clientName);
                            _outBound.flush();
                            response = _inBound.readLine();
                            if (!response.equals("OK")) {
                                throw new IOException("client name rejected - " + response);
                            }
                            SwingClient.addMessage("Control Link Established");

                        } catch (IOException e) {
                            SwingClient.addMessage("Control Link Error: " + e);
                            SwingClient.setStatus("Disconnected");
                        }
                    }
                    break;
                case STARTDATA:
                    SwingClient.addMessage("Attempting to open Data Channel");
                    try {
                        String response;
                        _outBound.println("STARTDATA");
                        _outBound.flush();
                        response = _inBound.readLine();
                        
                        // TEMPORARY FIREWALL FIX
                        // allows user to map an ssh pipe...
                        JOptionPane.showMessageDialog(null, "WARNING: about to connect to a port you may not have available!\nPlease ensure you have port \"" + response + "\" of your I-Scream server mapped to " + _server, "FIREWALL WARNING!", JOptionPane.INFORMATION_MESSAGE);
                        
                        try {
                            _dataLink = new Socket(_server, Integer.parseInt(response));
                        } catch (NumberFormatException e) {
                            throw new IOException("error, invalid data port suggested by server - " + response);
                        }
                        response = _inBound.readLine();
                        if (!response.equals("OK")) {
                            throw new IOException("server reported error establishing data channel - " + response);
                        }
                        _dataInBound = new BufferedReader(new InputStreamReader(_dataLink.getInputStream()));
                        _dataOutBound = new PrintWriter(_dataLink.getOutputStream());
                        SwingClient.addMessage("Data Link connection established");
                        SwingClient.addMessage("Starting data reader");

                        // here we will do some connect stuff.
                        Queue theQueue = new Queue();
                        _dataReader = new DataReader(_dataInBound, theQueue);
                        _data.setQueue(theQueue);
                        new Thread(_data).start();
                        _dataReader.start();
                        // finished for us....
                    } catch (IOException e) {
                        SwingClient.addMessage("Data Link Error: " + e);
                    }
                    break;
                case STOPDATA:
                    SwingClient.addMessage("Attempting to close Data Channel");
                    try {
                        String response;
                        _outBound.println("STOPDATA");
                        _outBound.flush();
                        response = _inBound.readLine();
                        if (!response.equals("OK")) {
                            throw new IOException("server didn't OK request to stop data channel");
                        }
                        // kill the data reader - we should wait
                        // for it to die nicely...but we won't yet...we'll kill the socket! ;-p
                        _dataReader.setRunning(false);
                        _dataInBound.close();
                        _dataOutBound.close();
                        _dataLink.close();
                        // get rid of the socket
                        _dataLink = null;
                        SwingClient.addMessage("Data Channel closed");
                    } catch (IOException e) {
                        SwingClient.addMessage("Data Link Error: " + e);
                    }
                    break;
                case DISCONNECT:
                    SwingClient.addMessage("Attempting to close Control Channel");
                    try {
                        if (_dataLink != null) {
                            // we want to tell ourselves to stop it
                            _actionQueue.add(new Integer(STOPDATA));
                            _actionQueue.add(new Integer(DISCONNECT));
                            throw new IOException("Warning - Data Channel not closed - attempting to close it!");
                        }
                        String response;
                        _outBound.println("END");
                        _outBound.flush();
                        response = _inBound.readLine();
                        if (!response.equals("OK")) {
                            throw new IOException("server didn't OK request to stop control channel");
                        }
                        // then lets go!
                        SwingClient.setStatus("Disconnecting - " + _server);
                        _inBound.close();
                        _outBound.close();
                        _controlLink.close();
                        // for good measure
                        _controlLink = null;
                        SwingClient.setStatus("Disconnected");
                    } catch (IOException e) {
                        SwingClient.addMessage("Control Link Error: " + e);
                    }
                    break;
                        
            }
        }
    }
    
            
    SwingClient SwingClient;
    DataPanel _data;
    Queue _actionQueue;
    int _myQueue;
    String _server;
    int _port = SwingClient.PORT;
    Socket _controlLink;
    Socket _dataLink;
    BufferedReader _inBound;
    PrintWriter _outBound;
    BufferedReader _dataInBound;
    PrintWriter _dataOutBound;
    DataReader _dataReader;
    String _clientName = "CadburyFlakeClient";
}
Revision:	1.2
Committed:	Mon Jan 22 03:03:39 2001 UTC (23 years, 4 months ago) by ajm
Branch:	MAIN
Changes since 1.1:	+129 -32 lines
Log Message:	re-worked to be better OO... ;-) added support for V1.0 client protocol all still very messy....
#	Content
1	import uk.ac.ukc.iscream.util.*;
2	import java.io.*;
3	import java.net.*;
4	import javax.swing.JOptionPane;
5
6	public class ConnectionHandler extends Thread {
7
8	public final String PROTOCOL_VERSION = "PROTOCOL 1.0";
9
10	public static final int DONOTHING = 0;
11	public static final int CONNECT = 1;
12	public static final int STARTDATA = 2;
13	public static final int STOPDATA = 3;
14	public static final int DISCONNECT = 4;
15
16	public ConnectionHandler(DataPanel data, Queue actionQueue) {
17	_data = data;
18	_actionQueue = actionQueue;
19	_myQueue = _actionQueue.getQueue();
20	}
21
22	public void run() {
23
24	while(true) {
25	// we wait for a call...
26	int action = 0;
27	try {
28	action = ((Integer) _actionQueue.get(_myQueue)).intValue();
29	} catch (InvalidQueueException e) {
30	// we 're never going to get this...
31	}
32
33	// examine our action...
34	// if it was to connect...then we connect...
35	switch(action) {
36	case CONNECT:
37
38	Object serverQuestion = null;
39	serverQuestion = JOptionPane.showInputDialog(null, "Please enter the name of a server running the I-Scream client interface:", "I-Scream Server", JOptionPane.INFORMATION_MESSAGE);
40	if (serverQuestion instanceof String) {
41	_server = (String) serverQuestion;
42	SwingClient.setStatus("Connecting to - " + _server);
43	try {
44	_controlLink = new Socket(_server, _port);
45	_inBound = new BufferedReader(new InputStreamReader(_controlLink.getInputStream()));
46	_outBound = new PrintWriter(_controlLink.getOutputStream());
47	SwingClient.setStatus("Connection Established - " + _server);
48	String response;
49	response = _inBound.readLine();
50	if (!response.equals(PROTOCOL_VERSION)) {
51	throw new IOException("invalid protocol version");
52	}
53	SwingClient.addMessage("Handshake Success - " + PROTOCOL_VERSION);
54
55	// send the name - get from somewhere eventually
56	_outBound.println(_clientName);
57	_outBound.flush();
58	response = _inBound.readLine();
59	if (!response.equals("OK")) {
60	throw new IOException("client name rejected - " + response);
61	}
62	SwingClient.addMessage("Control Link Established");
63
64	} catch (IOException e) {
65	SwingClient.addMessage("Control Link Error: " + e);
66	SwingClient.setStatus("Disconnected");
67	}
68	}
69	break;
70	case STARTDATA:
71	SwingClient.addMessage("Attempting to open Data Channel");
72	try {
73	String response;
74	_outBound.println("STARTDATA");
75	_outBound.flush();
76	response = _inBound.readLine();
77
78	// TEMPORARY FIREWALL FIX
79	// allows user to map an ssh pipe...
80	JOptionPane.showMessageDialog(null, "WARNING: about to connect to a port you may not have available!\nPlease ensure you have port \"" + response + "\" of your I-Scream server mapped to " + _server, "FIREWALL WARNING!", JOptionPane.INFORMATION_MESSAGE);
81
82	try {
83	_dataLink = new Socket(_server, Integer.parseInt(response));
84	} catch (NumberFormatException e) {
85	throw new IOException("error, invalid data port suggested by server - " + response);
86	}
87	response = _inBound.readLine();
88	if (!response.equals("OK")) {
89	throw new IOException("server reported error establishing data channel - " + response);
90	}
91	_dataInBound = new BufferedReader(new InputStreamReader(_dataLink.getInputStream()));
92	_dataOutBound = new PrintWriter(_dataLink.getOutputStream());
93	SwingClient.addMessage("Data Link connection established");
94	SwingClient.addMessage("Starting data reader");
95
96	// here we will do some connect stuff.
97	Queue theQueue = new Queue();
98	_dataReader = new DataReader(_dataInBound, theQueue);
99	_data.setQueue(theQueue);
100	new Thread(_data).start();
101	_dataReader.start();
102	// finished for us....
103	} catch (IOException e) {
104	SwingClient.addMessage("Data Link Error: " + e);
105	}
106	break;
107	case STOPDATA:
108	SwingClient.addMessage("Attempting to close Data Channel");
109	try {
110	String response;
111	_outBound.println("STOPDATA");
112	_outBound.flush();
113	response = _inBound.readLine();
114	if (!response.equals("OK")) {
115	throw new IOException("server didn't OK request to stop data channel");
116	}
117	// kill the data reader - we should wait
118	// for it to die nicely...but we won't yet...we'll kill the socket! ;-p
119	_dataReader.setRunning(false);
120	_dataInBound.close();
121	_dataOutBound.close();
122	_dataLink.close();
123	// get rid of the socket
124	_dataLink = null;
125	SwingClient.addMessage("Data Channel closed");
126	} catch (IOException e) {
127	SwingClient.addMessage("Data Link Error: " + e);
128	}
129	break;
130	case DISCONNECT:
131	SwingClient.addMessage("Attempting to close Control Channel");
132	try {
133	if (_dataLink != null) {
134	// we want to tell ourselves to stop it
135	_actionQueue.add(new Integer(STOPDATA));
136	_actionQueue.add(new Integer(DISCONNECT));
137	throw new IOException("Warning - Data Channel not closed - attempting to close it!");
138	}
139	String response;
140	_outBound.println("END");
141	_outBound.flush();
142	response = _inBound.readLine();
143	if (!response.equals("OK")) {
144	throw new IOException("server didn't OK request to stop control channel");
145	}
146	// then lets go!
147	SwingClient.setStatus("Disconnecting - " + _server);
148	_inBound.close();
149	_outBound.close();
150	_controlLink.close();
151	// for good measure
152	_controlLink = null;
153	SwingClient.setStatus("Disconnected");
154	} catch (IOException e) {
155	SwingClient.addMessage("Control Link Error: " + e);
156	}
157	break;
158
159	}
160	}
161	}
162
163
164	SwingClient SwingClient;
165	DataPanel _data;
166	Queue _actionQueue;
167	int _myQueue;
168	String _server;
169	int _port = SwingClient.PORT;
170	Socket _controlLink;
171	Socket _dataLink;
172	BufferedReader _inBound;
173	PrintWriter _outBound;
174	BufferedReader _dataInBound;
175	PrintWriter _dataOutBound;
176	DataReader _dataReader;
177	String _clientName = "CadburyFlakeClient";
178	}