Question

In First class have method “listen” which listening client socket

public void listen() throws IOException {       

        while (true) {
            socket = this.serverSocket.accept();

            DataOutputStream out = new DataOutputStream( socket.getOutputStream() );
            this.outputStreams.put(socket, out);


            Thread miltiServer;

            miltiServer = new Thread() {
                @Override
                public void run() {                    
                    InputStream sin = null;

                    try {                   
                        sin = socket.getInputStream();
                        ObjectInputStream in = new ObjectInputStream(sin);
                        message = (AgentData) in.readObject();

                    } catch (ClassNotFoundException ex) {

                    } catch (IOException ex) {

                    } 
                }
            };

            miltiServer.start();
        }

In Second class i need to read and analyze messages which recieved from client socket. I don’t know how to get messages in other class. I have idea to use Callable interface, but if i use it, return statement will exit from infinitive cycle.

Answer 1

An easy way for your socket listener to communicate the messages to your Second class is through a BlockingQueue. The listener would read from the socket input stream and call queue.put(...) to add any messages to the queue.

Then the Second class would be in a loop calling queue.take(); which would return each message when it is added to the queue. If you want unlimited messages to be queued then LinkedBlockingQueue would work. If you want to throttle the messages then a bounded queue such as ArrayBlockingQueue might be more appropriate.

Both threads would need to share the same BlockingQueue so you will need to construct it and pass it to both threads or put a method on your Second class named something like addMessage(...) and the BlockingQueue would be inside of your Second class. Then the listener would call second.addMessage(...);.