| 1 | package dolda.dolcon; |
| 2 | |
| 3 | import java.io.*; |
| 4 | import java.net.Socket; |
| 5 | import java.util.*; |
| 6 | |
| 7 | public class Connection { |
| 8 | Socket s; |
| 9 | Reader reader; |
| 10 | LinkedList<Response> resps = new LinkedList<Response>(); |
| 11 | |
| 12 | public Connection(String aspec) throws ConnectException { |
| 13 | try { |
| 14 | s = new Socket(aspec, 1500); |
| 15 | } catch(java.net.UnknownHostException e) { |
| 16 | throw(new ConnectException("Could not resolve host " + aspec, e)); |
| 17 | } catch(IOException e) { |
| 18 | throw(new ConnectException("Could not connect to host " + aspec, e)); |
| 19 | } |
| 20 | reader = new Reader(s, resps); |
| 21 | reader.start(); |
| 22 | } |
| 23 | |
| 24 | static private class Reader extends Thread { |
| 25 | Exception error = null; |
| 26 | Socket s; |
| 27 | Collection<Response> resps; |
| 28 | |
| 29 | public Reader(Socket s, Collection<Response> resps) { |
| 30 | this.s = s; |
| 31 | this.resps = resps; |
| 32 | setDaemon(true); |
| 33 | } |
| 34 | |
| 35 | public void run() { |
| 36 | java.io.Reader r; |
| 37 | try { |
| 38 | r = new BufferedReader(new InputStreamReader(s.getInputStream(), "UTF-8")); |
| 39 | } catch(IOException e) { |
| 40 | synchronized(resps) { |
| 41 | resps.notifyAll(); |
| 42 | error = e; |
| 43 | } |
| 44 | return; |
| 45 | } |
| 46 | String state = "start"; |
| 47 | StringBuilder ct = new StringBuilder(); |
| 48 | int code = -1; |
| 49 | boolean last = true; |
| 50 | List<List<String>>lines = new LinkedList<List<String>>(); |
| 51 | List<String>tokens = new LinkedList<String>(); |
| 52 | while(true) { |
| 53 | char c; |
| 54 | { |
| 55 | int i; |
| 56 | try { |
| 57 | if((i = r.read()) < 0) { |
| 58 | throw(new IOException("The server closed the connection")); |
| 59 | } |
| 60 | } catch(IOException e) { |
| 61 | synchronized(resps) { |
| 62 | resps.notifyAll(); |
| 63 | error = e; |
| 64 | } |
| 65 | return; |
| 66 | } |
| 67 | c = (char)i; |
| 68 | } |
| 69 | eat: do { |
| 70 | if(state == "start") { |
| 71 | if(c == '\r') { |
| 72 | state = "nl"; |
| 73 | } else if(Character.isWhitespace(c)) { |
| 74 | } else { |
| 75 | if(code == -1) |
| 76 | state = "code"; |
| 77 | else |
| 78 | state = "token"; |
| 79 | continue eat; |
| 80 | } |
| 81 | } else if(state == "nl") { |
| 82 | if(c == '\n') { |
| 83 | if(code == -1) { |
| 84 | synchronized(resps) { |
| 85 | resps.notifyAll(); |
| 86 | try { |
| 87 | throw(new IOException("Illegal response code " + code + " from the server")); |
| 88 | } catch(IOException e) { |
| 89 | error = e; |
| 90 | } |
| 91 | } |
| 92 | return; |
| 93 | } |
| 94 | lines.add(tokens); |
| 95 | tokens = new LinkedList<String>(); |
| 96 | if(last) { |
| 97 | synchronized(resps) { |
| 98 | resps.add(new Response(code, lines)); |
| 99 | resps.notifyAll(); |
| 100 | } |
| 101 | lines = new LinkedList<List<String>>(); |
| 102 | } |
| 103 | state = "start"; |
| 104 | } else { |
| 105 | state = "start"; |
| 106 | continue eat; |
| 107 | } |
| 108 | } else if(state == "code") { |
| 109 | if((c == '-') || Character.isWhitespace(c)) { |
| 110 | last = c != '-'; |
| 111 | code = Integer.parseInt(ct.toString()); |
| 112 | ct.setLength(0); |
| 113 | state = "start"; |
| 114 | continue eat; |
| 115 | } else { |
| 116 | ct.append(c); |
| 117 | } |
| 118 | } else if(state == "token") { |
| 119 | if(Character.isWhitespace(c)) { |
| 120 | tokens.add(ct.toString()); |
| 121 | ct.setLength(0); |
| 122 | state = "start"; |
| 123 | code = -1; |
| 124 | continue eat; |
| 125 | } else if(c == '\\') { |
| 126 | state = "bs"; |
| 127 | } else if(c == '"') { |
| 128 | state = "cited"; |
| 129 | } else { |
| 130 | ct.append(c); |
| 131 | } |
| 132 | } else if(state == "bs") { |
| 133 | ct.append(c); |
| 134 | state = "token"; |
| 135 | } else if(state == "cited") { |
| 136 | if(c == '\\') |
| 137 | state = "cbs"; |
| 138 | else if(c == '"') |
| 139 | state = "token"; |
| 140 | else |
| 141 | ct.append(c); |
| 142 | } else if(state == "cbs") { |
| 143 | ct.append(c); |
| 144 | state = "cited"; |
| 145 | } else { |
| 146 | throw(new Error("invalid state " + state)); |
| 147 | } |
| 148 | break; |
| 149 | } while(true); |
| 150 | } |
| 151 | } |
| 152 | } |
| 153 | |
| 154 | protected void finalize() { |
| 155 | try { |
| 156 | s.close(); |
| 157 | } catch(IOException e) { |
| 158 | } |
| 159 | reader.interrupt(); |
| 160 | } |
| 161 | |
| 162 | public static void main(String[] args) throws Exception { |
| 163 | Connection c = new Connection("pc18"); |
| 164 | while(true) { |
| 165 | while(c.resps.size() > 0) { |
| 166 | System.out.println(c.resps.remove(0)); |
| 167 | } |
| 168 | synchronized(c.resps) { |
| 169 | c.resps.wait(); |
| 170 | } |
| 171 | } |
| 172 | } |
| 173 | } |