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Socket: Allow Writing and Receiving on the same socket

Posted on 2007-04-06
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Last Modified: 2010-03-31
Hi experts,

After accept the socket Socket socket = serverSocket.accept() in a object
How can I achieve the followings simutaneously?
1) non-stop monitoring socket for incoming message, received message have to pass to outer object
2) allow other objects to send message?

It seems to me that something called "callback" interface has to be implemented, I am looking for sample codes of this...  and explanations...
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Question by:alenwong
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Siva Prasanna Kumar earned 125 total points
ID: 18865139
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by:CEHJ
CEHJ earned 125 total points
ID: 18865320
>>1) non-stop monitoring socket for incoming message, received message have to pass to outer object

All you need is

a. a separately threaded loop
b. a method on the outer object to call with the message as a parameter

>>2) allow other objects to send message?

An interface to the socket's output stream allowing the message to be passed as a parameter
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Author Comment

by:alenwong
ID: 18865343
shivaspk: don't sure if there's any implementation based on Socket and ServerSocket

CEHJ: it would be grateful if you could provide example...  
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by:Mayank S
Mayank S earned 125 total points
ID: 18865708
Have a look at this to get an idea of a sample multi-threaded server:

http://www.experts-exchange.com/Programming/Languages/Java/Q_21757720.html#16084277

In the run () method, you could loop and receive values:

while ( running )
{
  String s = br.readLine () ;
  System.out.println ( s ) ;
}

For sending, you can provide a method like:

public void send ( String s )
{
  writer.println ( s ) ;
}
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Author Comment

by:alenwong
ID: 18865762
mayankeagle: don't sure if this segment allows only sequenial read and write, that means a read write write or write write read is not possible....  

    try
    {
      BufferedReader reader = new BufferedReader ( new InputStreamReader ( s.getInputStream () ) ) ;
      PrintWriter writer = new PrintWriter ( s.getOutputStream (), true ) ;
      while ( true )
      {
        // use 'reader' to read commands from the client
        // use 'writer' to send response to the client
      }
    }
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Expert Comment

by:Mayank S
ID: 18866197
You need to change it slightly. the ServerThread will have:

class ServerThread implements Runnable
{
  private Socket s ;
  private BufferedReader reader ;
  private PrintWriter writer ;
  public ServerThread ( Socket s )
  {
    this.s = s ;
    // initialize reader and writer here, as in the run () method
    ..
  }
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by:ksivananth
ksivananth earned 125 total points
ID: 18868558
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