New Server class to send/rec objects via network

[nikiroo-utils.git] / src / be / nikiroo / utils / serial / ConnectAction.java

diff --git a/src/be/nikiroo/utils/serial/ConnectAction.java b/src/be/nikiroo/utils/serial/ConnectAction.java
new file mode 100644 (file)
index 0000000..ec49a1d
--- /dev/null
+++ b/src/be/nikiroo/utils/serial/ConnectAction.java
@@ -0,0 +1,147 @@
+package be.nikiroo.utils.serial;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+import java.net.Socket;
+
+import be.nikiroo.utils.Version;
+
+abstract class ConnectAction {
+       private Socket s;
+       private boolean server;
+       private Version version;
+
+       private Object lock = new Object();
+       private BufferedReader in;
+       private OutputStreamWriter out;
+       private boolean contentToSend;
+
+       // serverVersion = null on server (or bad clients)
+       abstract public void action(Version serverVersion) throws Exception;
+
+       // server = version NULL
+       protected ConnectAction(Socket s, boolean server, Version version) {
+               this.s = s;
+               this.server = server;
+
+               if (version == null) {
+                       this.version = new Version();
+               } else {
+                       this.version = version;
+               }
+       }
+
+       public void connectAsync() {
+               new Thread(new Runnable() {
+                       public void run() {
+                               connect();
+                       }
+               }).start();
+       }
+
+       public void connect() {
+               try {
+                       in = new BufferedReader(new InputStreamReader(s.getInputStream(),
+                                       "UTF-8"));
+                       try {
+                               out = new OutputStreamWriter(s.getOutputStream(), "UTF-8");
+                               try {
+                                       if (server) {
+                                               action(version);
+                                       } else {
+                                               String v = sendString("VERSION " + version.toString());
+                                               if (v != null && v.startsWith("VERSION ")) {
+                                                       v = v.substring("VERSION ".length());
+                                               }
+
+                                               action(new Version(v));
+                                       }
+                               } finally {
+                                       out.close();
+                               }
+                       } finally {
+                               in.close();
+                       }
+               } catch (Exception e) {
+                       onError(e);
+               } finally {
+                       try {
+                               s.close();
+                       } catch (Exception e) {
+                               onError(e);
+                       }
+               }
+       }
+
+       // (also, server never get anything)
+       public Object send(Object data) throws IOException, NoSuchFieldException,
+                       NoSuchMethodException, ClassNotFoundException {
+               synchronized (lock) {
+                       String rep = sendString(new Exporter().append(data).toString(true));
+                       return new Importer().read(rep).getValue();
+               }
+       }
+
+       public Object flush() throws NoSuchFieldException, NoSuchMethodException,
+                       ClassNotFoundException, IOException, java.lang.NullPointerException {
+               String str = flushString();
+               if (str == null) {
+                       throw new NullPointerException("No more data from client");
+               }
+
+               return new Importer().read(str).getValue();
+       }
+
+       protected void onClientVersionReceived(Version clientVersion) {
+
+       }
+
+       protected void onError(Exception e) {
+
+       }
+
+       // \n included in line, but not in rep (also, server never get anything)
+       private String sendString(String line) throws IOException {
+               synchronized (lock) {
+                       out.write(line);
+                       out.write("\n");
+
+                       if (server) {
+                               out.flush();
+                               return null;
+                       } else {
+                               contentToSend = true;
+                               return flushString();
+                       }
+               }
+       }
+
+       // server can receive something even without pending content
+       private String flushString() throws IOException {
+               synchronized (lock) {
+                       if (server || contentToSend) {
+                               if (contentToSend) {
+                                       out.flush();
+                                       contentToSend = false;
+                               }
+
+                               String line = in.readLine();
+                               if (server && line != null && line.startsWith("VERSION ")) {
+                                       // "VERSION client-version" (VERSION 1.0.0)
+                                       Version clientVersion = new Version(
+                                                       line.substring("VERSION ".length()));
+                                       onClientVersionReceived(clientVersion);
+                                       sendString("VERSION " + version.toString());
+
+                                       line = in.readLine();
+                               }
+
+                               return line;
+                       } else {
+                               return null;
+                       }
+               }
+       }
+}
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