public PoolTcpEndpoint() 
{
	tp = new ThreadPool();
}

 public PoolTcpEndpoint(ThreadPool tp) 
{
        this.tp=tp;
}

 Socket acceptSocket() 
{
        if( !running || serverSocket==null ) return null;
        Socket accepted = null;
    	try {
            if(factory==null) {
                accepted = serverSocket.accept();
            } else {
                accepted = factory.acceptSocket(serverSocket);
            }
            if (null == accepted) {
                log.warn(sm.getString("endpoint.warn.nullSocket"));
            } else {
                if (!running) {
                    accepted.close();  // rude, but unlikely!
                    accepted = null;
                } else if (factory != null) {
                    factory.initSocket( accepted );
                }
            }
        }
        catch(InterruptedIOException iioe) {
            // normal part -- should happen regularly so
            // that the endpoint can release if the server
            // is shutdown.
        }
        catch (AccessControlException ace) {
            // When using the Java SecurityManager this exception
            // can be thrown if you are restricting access to the
            // socket with SocketPermission's.
            // Log the unauthorized access and continue
            String msg = sm.getString("endpoint.warn.security",
                                      serverSocket, ace);
            log.warn(msg);
        }
        catch (IOException e) {
            String msg = null;
            if (running) {
                msg = sm.getString("endpoint.err.nonfatal",
                        serverSocket, e);
                log.error(msg, e);
            }
            if (accepted != null) {
                try {
                    accepted.close();
                } catch(Throwable ex) {
                    msg = sm.getString("endpoint.err.nonfatal",
                                       accepted, ex);
                    log.warn(msg, ex);
                }
                accepted = null;
            }
            if( ! running ) return null;
            reinitializing = true;
            // Restart endpoint when getting an IOException during accept
            synchronized (threadSync) {
                if (reinitializing) {
                    reinitializing = false;
                    // 1) Attempt to close server socket
                    closeServerSocket();
                    initialized = false;
                    // 2) Reinit endpoint (recreate server socket)
                    try {
                        msg = sm.getString("endpoint.warn.reinit");
                        log.warn(msg);
                        initEndpoint();
                    } catch (Throwable t) {
                        msg = sm.getString("endpoint.err.nonfatal",
                                           serverSocket, t);
                        log.error(msg, t);
                    }
                    // 3) If failed, attempt to restart endpoint
                    if (!initialized) {
                        msg = sm.getString("endpoint.warn.restart");
                        log.warn(msg);
                        try {
                            stopEndpoint();
                            initEndpoint();
                            startEndpoint();
                        } catch (Throwable t) {
                            msg = sm.getString("endpoint.err.fatal",
                                               serverSocket, t);
                            log.error(msg, t);
                        }
                        // Current thread is now invalid: kill it
                        throw new ThreadDeath();
                    }
                }
            }
        }
        return accepted;
}

 protected  void closeServerSocket() 
{
        if (!paused)
            unlockAccept();
        try {
            if( serverSocket!=null)
                serverSocket.close();
        } catch(Exception e) {
            log.error(sm.getString("endpoint.err.close"), e);
        }
        serverSocket = null;
}

 public InetAddress getAddress() 
{
	    return inet;
}

 public int getBacklog() 
{
        return backlog;
}

 public TcpConnectionHandler getConnectionHandler() 
{
	    return handler;
}

 public int getCurrentThreadCount() 
{
        return curThreads;
}

 public int getCurrentThreadsBusy() 
{
        return curThreads - workerThreads.size();
}

 public int getMaxSpareThreads() 
{
        return tp.getMaxSpareThreads();
}

 public int getMaxThreads() 
{
        return tp.getMaxThreads();
}

 public int getMinSpareThreads() 
{
        return tp.getMinSpareThreads();
}

 public int getPort() 
{
        return port;
}

 public int getServerSoTimeout() 
{
        return serverTimeout;
}

 ServerSocketFactory getServerSocketFactory() 
{
 	    return factory;
}

 public int getSoLinger() 
{
        return linger;
}

 public int getSoTimeout() 
{
        return socketTimeout;
}

 public String getStrategy() 
{
        if (lf) {
            return "lf";
        } else {
            return "ms";
        }
}

 public boolean getTcpNoDelay() 
{
        return tcpNoDelay;
}

 public int getThreadPriority() 
{
      return tp.getThreadPriority();
}

 public  void initEndpoint() throws IOException, InstantiationException 
{
        try {
            if(factory==null)
                factory=ServerSocketFactory.getDefault();
            if(serverSocket==null) {
                try {
                    if (inet == null) {
                        serverSocket = factory.createSocket(port, backlog);
                    } else {
                        serverSocket = factory.createSocket(port, backlog, inet);
                    }
                } catch (BindException orig) {
                    String msg;
                    if (inet == null)
                        msg = orig.getMessage() + "< null >:" + port;
                    else
                        msg = orig.getMessage() + " " +
                                inet.toString() + ":" + port;
                    BindException be = new BindException(msg);
                    be.initCause(orig);
                    throw be;
                }
            }
            if( serverTimeout  >= 0 )
                serverSocket.setSoTimeout( serverTimeout );
        } catch( IOException ex ) {
            throw ex;
        } catch( InstantiationException ex1 ) {
            throw ex1;
        }
        initialized = true;
}

 public boolean isPaused() 
{
	return paused;
}

 public boolean isRunning() 
{
	return running;
}

 public  void pauseEndpoint() 
{
        if (running && !paused) {
            paused = true;
            unlockAccept();
        }
}

  void processSocket(Socket s,
    TcpConnection con,
    Object[] threadData) 
{
        // Process the connection
        int step = 1;
        try {
            // 1: Set socket options: timeout, linger, etc
            setSocketOptions(s);
            // 2: SSL handshake
            step = 2;
            if (getServerSocketFactory() != null) {
                getServerSocketFactory().handshake(s);
            }
            // 3: Process the connection
            step = 3;
            con.setEndpoint(this);
            con.setSocket(s);
            getConnectionHandler().processConnection(con, threadData);
        } catch (SocketException se) {
            log.debug(sm.getString("endpoint.err.socket", s.getInetAddress()),
                    se);
            // Try to close the socket
            try {
                s.close();
            } catch (IOException e) {
            }
        } catch (Throwable t) {
            if (step == 2) {
                if (log.isDebugEnabled()) {
                    log.debug(sm.getString("endpoint.err.handshake"), t);
                }
            } else {
                log.error(sm.getString("endpoint.err.unexpected"), t);
            }
            // Try to close the socket
            try {
                s.close();
            } catch (IOException e) {
            }
        } finally {
            if (con != null) {
                con.recycle();
            }
        }
}

  void recycleWorkerThread(MasterSlaveWorkerThread workerThread) 
{
        workerThreads.push(workerThread);
}

Recycle the specified Processor so that it can be used again.

 public  void resumeEndpoint() 
{
        if (running) {
            paused = false;
        }
}

 public  void run() 
{
        // Loop until we receive a shutdown command
        while (running) {
            // Loop if endpoint is paused
            while (paused) {
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    // Ignore
                }
            }
            // Allocate a new worker thread
            MasterSlaveWorkerThread workerThread = createWorkerThread();
            if (workerThread == null) {
                try {
                    // Wait a little for load to go down: as a result, 
                    // no accept will be made until the concurrency is
                    // lower than the specified maxThreads, and current
                    // connections will wait for a little bit instead of
                    // failing right away.
                    Thread.sleep(100);
                } catch (InterruptedException e) {
                    // Ignore
                }
                continue;
            }
            // Accept the next incoming connection from the server socket
            Socket socket = acceptSocket();
            // Hand this socket off to an appropriate processor
            workerThread.assign(socket);
            // The processor will recycle itself when it finishes
        }
        // Notify the threadStop() method that we have shut ourselves down
        synchronized (threadSync) {
            threadSync.notifyAll();
        }
}

The background thread that listens for incoming TCP/IP connections and hands them off to an appropriate processor.

 public  void setAddress(InetAddress inet) 
{
	    this.inet=inet;
}

 public  void setBacklog(int backlog) 
{
	if( backlog >0)
	    this.backlog = backlog;
}

Allows the server developer to specify the backlog that should be used for server sockets. By default, this value is 100.

 public  void setConnectionHandler(TcpConnectionHandler handler) 
{
    	this.handler=handler;
}

 public  void setMaxSpareThreads(int maxThreads) 
{
	if(maxThreads  > 0) 
	    tp.setMaxSpareThreads(maxThreads);
}

 public  void setMaxThreads(int maxThreads) 
{
	if( maxThreads  > 0)
	    tp.setMaxThreads(maxThreads);
}

 public  void setMinSpareThreads(int minThreads) 
{
	if(minThreads  > 0) 
	    tp.setMinSpareThreads(minThreads);
}

 public  void setPort(int port) 
{
        this.port=port;
}

 public  void setServerSoTimeout(int i) 
{
	serverTimeout=i;
}

 public  void setServerSocket(ServerSocket ss) 
{
	    serverSocket = ss;
}

 public  void setServerSocketFactory(ServerSocketFactory factory) 
{
	    this.factory=factory;
}

 public  void setServerTimeout(int timeout) 
{
	this.serverTimeout = timeout;
}

Sets the timeout in ms of the server sockets created by this server. This method allows the developer to make servers more or less responsive to having their server sockets shut down.

By default this value is 1000ms.

 public  void setSoLinger(int i) 
{
	linger=i;
}

 public  void setSoTimeout(int i) 
{
	socketTimeout=i;
}

  void setSocketOptions(Socket socket) throws SocketException 
{
        if(linger  >= 0 ) 
            socket.setSoLinger( true, linger);
        if( tcpNoDelay )
            socket.setTcpNoDelay(tcpNoDelay);
        if( socketTimeout  > 0 )
            socket.setSoTimeout( socketTimeout );
}

 public  void setStrategy(String strategy) 
{
        if ("ms".equals(strategy)) {
            lf = false;
        } else {
            lf = true;
        }
}

 public  void setTcpNoDelay(boolean b) 
{
	tcpNoDelay=b;
}

 public  void setThreadPriority(int threadPriority) 
{
      tp.setThreadPriority(threadPriority);
}

 public  void startEndpoint() throws IOException, InstantiationException 
{
        if (!initialized) {
            initEndpoint();
        }
        if (lf) {
            tp.start();
        }
        running = true;
        paused = false;
        if (lf) {
            listener = new LeaderFollowerWorkerThread(this);
            tp.runIt(listener);
        } else {
            maxThreads = getMaxThreads();
            threadStart();
        }
}

 public  void stopEndpoint() 
{
        if (running) {
            if (lf) {
                tp.shutdown();
            }
            running = false;
            if (serverSocket != null) {
                closeServerSocket();
            }
            if (!lf) {
                threadStop();
            }
            initialized=false ;
        }
}

 protected  void unlockAccept() 
{
        Socket s = null;
        try {
            // Need to create a connection to unlock the accept();
            if (inet == null) {
                s = new Socket(InetAddress.getByName("localhost").getHostAddress(), port);
            } else {
                s = new Socket(inet, port);
                    // setting soLinger to a small value will help shutdown the
                    // connection quicker
                s.setSoLinger(true, 0);
            }
        } catch(Exception e) {
            if (log.isDebugEnabled()) {
                log.debug(sm.getString("endpoint.debug.unlock", "" + port), e);
            }
        } finally {
            if (s != null) {
                try {
                    s.close();
                } catch (Exception e) {
                    // Ignore
                }
            }
        }
}