anyone? On May 27, 5:31 pm, ayanir <[email protected]> wrote: > Hello, > > I’m working on application that uses a socket connection. > I’ve implemented 2 different Threads for the read() and the write() > methods so they are not being blocked by the read. > Everything is working well on the WiFi connection but when I switch to > GSM connection the connection becomes unstable without any exception > being thrown. It means that there are freezes – the write and read > seems to work but no data is actually being piped. > Here is what I’m doing: > > private Socket socketConn = null; > private DataInputStream dis = null; > private DataOutputStream dos = null; > > //Read buffer > private byte[] buffer; > ByteArrayOutputStream readBuffer; > > private String serverAddress; > private int serverPort; > > public void openConnection(int timeout) throws Exception { > if(socketConn != null){ > return; > } > > //if we need to resolve the host - if succeed we replace the default > otherwise we use the default. > //the check is done only once. > if(checkHostResolved){ > checkHostResolved = false; > try{ > InetAddress ia = > InetAddress.getByName(serverHostAddress); > serverAddress = ia.getHostAddress(); > } > catch(UnknownHostException e2){ > MyLog.printException(this, e2, > "run()InetAddress.getByName"); > } > } > socketConn = new Socket(); > InetSocketAddress isa = new InetSocketAddress(serverAddress, > serverPort); > socketConn.connect(isa, timeout); > socketConn.setKeepAlive(true); > socketConn.setTcpNoDelay(true); > socketConn.setSoLinger(true, 1000); > > dis = new DataInputStream(socketConn.getInputStream()); > dos = new DataOutputStream(socketConn.getOutputStream()); > > } > > public void closeConnection() { > if(socketConn != null){ > try{ > if(dis != null){ > socketConn.shutdownInput(); > dis.close(); > } > if(dos != null){ > socketConn.shutdownOutput(); > dos.close(); > } > if(socketConn != null){ > socketConn.close(); > } > if(readBuffer != null){ > readBuffer.reset(); > } > } > catch(IOException ioe){ > MyLog.printException(this, ioe, "Problem Closing > connection"); > } > finally{ > dis = null; > dos = null; > socketConn = null; > } > } > MyLog.printLog(this, "closeConnection end"); > > } > > private int trySend(String message) { > > try{ > byte[] data = message.getBytes(); > dos.write(data); > dos.flush(); > return 0; > } > catch(SocketException se){ > MyLog.printException(this, se, "Problem with trySend"); > } > catch(Exception e){ > MyLog.printException(this, e, "trySend()"); > } > > MyLog.printLog(this, "trySend() Problem with trySend!!!!"); > return ERROR_CODE_CONNECTION; > > } > > private boolean tryRead() { > try{ > int b = 0; > while((b = dis.read(buffer)) > 0){ > readBuffer.write(buffer, 0, b); > > //if the last read byte is '\0' then we have complete > reading at > least 1 packet of data > if(buffer[b - 1] == '\0'){ > byte[] data = readBuffer.toByteArray(); > MyLog.printLog(this, "read data.length=" + > data.length); > readBuffer.reset(); > String text = new String(data, "utf-8"); > return true; > } > MyLog.printLog(this, "out while read b=" + b); > //if the b<0 then EOF has reached > if(b < 0){ > throw new Exception("EOF has reached"); > } > } > } > catch(Exception e){ > } > return false; > > } > > Does anyone encounter connection stability problems? > Do I need to open the connection differently? > How about using SocketChannel is it more reliable? > Does Socket connection is a good approach when talking about mobile > network connection? > > Thanks > ayanir
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