src/be/nikiroo/utils/serial/ConnectAction.java

   1 package be.nikiroo.utils.serial;
   2
   3 import java.io.BufferedReader;
   4 import java.io.IOException;
   5 import java.io.InputStreamReader;
   6 import java.io.OutputStreamWriter;
   7 import java.net.Socket;
   8
   9 import be.nikiroo.utils.Version;
  10
  11 abstract class ConnectAction {
  12         private Socket s;
  13         private boolean server;
  14         private Version version;
  15
  16         private Object lock = new Object();
  17         private BufferedReader in;
  18         private OutputStreamWriter out;
  19         private boolean contentToSend;
  20
  21         // serverVersion = null on server (or bad clients)
  22         abstract public void action(Version serverVersion) throws Exception;
  23
  24         // server = version NULL
  25         protected ConnectAction(Socket s, boolean server, Version version) {
  26                 this.s = s;
  27                 this.server = server;
  28
  29                 if (version == null) {
  30                         this.version = new Version();
  31                 } else {
  32                         this.version = version;
  33                 }
  34         }
  35
  36         public void connectAsync() {
  37                 new Thread(new Runnable() {
  38                         public void run() {
  39                                 connect();
  40                         }
  41                 }).start();
  42         }
  43
  44         public void connect() {
  45                 try {
  46                         in = new BufferedReader(new InputStreamReader(s.getInputStream(),
  47                                         "UTF-8"));
  48                         try {
  49                                 out = new OutputStreamWriter(s.getOutputStream(), "UTF-8");
  50                                 try {
  51                                         if (server) {
  52                                                 action(version);
  53                                         } else {
  54                                                 String v = sendString("VERSION " + version.toString());
  55                                                 if (v != null && v.startsWith("VERSION ")) {
  56                                                         v = v.substring("VERSION ".length());
  57                                                 }
  58
  59                                                 action(new Version(v));
  60                                         }
  61                                 } finally {
  62                                         out.close();
  63                                 }
  64                         } finally {
  65                                 in.close();
  66                         }
  67                 } catch (Exception e) {
  68                         onError(e);
  69                 } finally {
  70                         try {
  71                                 s.close();
  72                         } catch (Exception e) {
  73                                 onError(e);
  74                         }
  75                 }
  76         }
  77
  78         // (also, server never get anything)
  79         public Object send(Object data) throws IOException, NoSuchFieldException,
  80                         NoSuchMethodException, ClassNotFoundException {
  81                 synchronized (lock) {
  82                         String rep = sendString(new Exporter().append(data).toString(true));
  83                         return new Importer().read(rep).getValue();
  84                 }
  85         }
  86
  87         public Object flush() throws NoSuchFieldException, NoSuchMethodException,
  88                         ClassNotFoundException, IOException, java.lang.NullPointerException {
  89                 String str = flushString();
  90                 if (str == null) {
  91                         throw new NullPointerException("No more data from client");
  92                 }
  93
  94                 return new Importer().read(str).getValue();
  95         }
  96
  97         protected void onClientVersionReceived(Version clientVersion) {
  98
  99         }
 100
 101         protected void onError(Exception e) {
 102
 103         }
 104
 105         // \n included in line, but not in rep (also, server never get anything)
 106         private String sendString(String line) throws IOException {
 107                 synchronized (lock) {
 108                         out.write(line);
 109                         out.write("\n");
 110
 111                         if (server) {
 112                                 out.flush();
 113                                 return null;
 114                         } else {
 115                                 contentToSend = true;
 116                                 return flushString();
 117                         }
 118                 }
 119         }
 120
 121         // server can receive something even without pending content
 122         private String flushString() throws IOException {
 123                 synchronized (lock) {
 124                         if (server || contentToSend) {
 125                                 if (contentToSend) {
 126                                         out.flush();
 127                                         contentToSend = false;
 128                                 }
 129
 130                                 String line = in.readLine();
 131                                 if (server && line != null && line.startsWith("VERSION ")) {
 132                                         // "VERSION client-version" (VERSION 1.0.0)
 133                                         Version clientVersion = new Version(
 134                                                         line.substring("VERSION ".length()));
 135                                         onClientVersionReceived(clientVersion);
 136                                         sendString("VERSION " + version.toString());
 137
 138                                         line = in.readLine();
 139                                 }
 140
 141                                 return line;
 142                         } else {
 143                                 return null;
 144                         }
 145                 }
 146         }
 147 }