| 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 | @Override |
| 39 | public void run() { |
| 40 | connect(); |
| 41 | } |
| 42 | }).start(); |
| 43 | } |
| 44 | |
| 45 | public void connect() { |
| 46 | try { |
| 47 | in = new BufferedReader(new InputStreamReader(s.getInputStream(), |
| 48 | "UTF-8")); |
| 49 | try { |
| 50 | out = new OutputStreamWriter(s.getOutputStream(), "UTF-8"); |
| 51 | try { |
| 52 | if (server) { |
| 53 | action(version); |
| 54 | } else { |
| 55 | String v = sendString("VERSION " + version.toString()); |
| 56 | if (v != null && v.startsWith("VERSION ")) { |
| 57 | v = v.substring("VERSION ".length()); |
| 58 | } |
| 59 | |
| 60 | action(new Version(v)); |
| 61 | } |
| 62 | } finally { |
| 63 | out.close(); |
| 64 | } |
| 65 | } finally { |
| 66 | in.close(); |
| 67 | } |
| 68 | } catch (Exception e) { |
| 69 | onError(e); |
| 70 | } finally { |
| 71 | try { |
| 72 | s.close(); |
| 73 | } catch (Exception e) { |
| 74 | onError(e); |
| 75 | } |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | // (also, server never get anything) |
| 80 | public Object send(Object data) throws IOException, NoSuchFieldException, |
| 81 | NoSuchMethodException, ClassNotFoundException { |
| 82 | synchronized (lock) { |
| 83 | String rep = sendString(new Exporter().append(data).toString(true)); |
| 84 | return new Importer().read(rep).getValue(); |
| 85 | } |
| 86 | } |
| 87 | |
| 88 | public Object flush() throws NoSuchFieldException, NoSuchMethodException, |
| 89 | ClassNotFoundException, IOException, java.lang.NullPointerException { |
| 90 | String str = flushString(); |
| 91 | if (str == null) { |
| 92 | throw new NullPointerException("No more data from client"); |
| 93 | } |
| 94 | |
| 95 | return new Importer().read(str).getValue(); |
| 96 | } |
| 97 | |
| 98 | /** |
| 99 | * Handler called when the client {@link Version} is received. |
| 100 | * |
| 101 | * @param clientVersion |
| 102 | * the client {@link Version} |
| 103 | */ |
| 104 | protected void onClientVersionReceived( |
| 105 | @SuppressWarnings("unused") Version clientVersion) { |
| 106 | } |
| 107 | |
| 108 | /** |
| 109 | * Handler called when an unexpected error occurs in the code. |
| 110 | * |
| 111 | * @param e |
| 112 | * the exception that occurred |
| 113 | */ |
| 114 | protected void onError(@SuppressWarnings("unused") Exception e) { |
| 115 | } |
| 116 | |
| 117 | // \n included in line, but not in rep (also, server never get anything) |
| 118 | private String sendString(String line) throws IOException { |
| 119 | synchronized (lock) { |
| 120 | out.write(line); |
| 121 | out.write("\n"); |
| 122 | |
| 123 | if (server) { |
| 124 | out.flush(); |
| 125 | return null; |
| 126 | } |
| 127 | |
| 128 | contentToSend = true; |
| 129 | return flushString(); |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | // server can receive something even without pending content |
| 134 | private String flushString() throws IOException { |
| 135 | synchronized (lock) { |
| 136 | if (server || contentToSend) { |
| 137 | if (contentToSend) { |
| 138 | out.flush(); |
| 139 | contentToSend = false; |
| 140 | } |
| 141 | |
| 142 | String line = in.readLine(); |
| 143 | if (server && line != null && line.startsWith("VERSION ")) { |
| 144 | // "VERSION client-version" (VERSION 1.0.0) |
| 145 | Version clientVersion = new Version( |
| 146 | line.substring("VERSION ".length())); |
| 147 | onClientVersionReceived(clientVersion); |
| 148 | sendString("VERSION " + version.toString()); |
| 149 | |
| 150 | line = in.readLine(); |
| 151 | } |
| 152 | |
| 153 | return line; |
| 154 | } |
| 155 | |
| 156 | return null; |
| 157 | } |
| 158 | } |
| 159 | } |