ACE Tutorial 015

ACE Tutorial 015 Building a protocol stream

And now the implementation of Server. This is actually just the main() code from a previous tutorial broken into appropriate method calls. It may seem silly to do this rather than keeping the stuff in main() but you'll find that you have less trouble enhancing an application when you take this sort of approach.


// page07.html,v 1.13 1999/09/22 03:13:53 jcej Exp

#include "Server_i.h"

/* We have to allocate space for our static finished_ flag.  We also
   initialize it to 'false' so that we don't exit immediately.
*/
sig_atomic_t Server::finished_ = 0;

/* The simple constructor and destructor don't do anything but give us
   a place to expand in the future if we want.
*/
Server::Server(void)
{
    ;
}

Server::~Server(void)
{
    ;
}

/* Opening the server is as simple as opening the acceptor with the
   default ACE_Reactor instance.  If we want to allow multiple
   instances of Server objects then we should have an ACE_Reactor
   member variable that we can register with.
*/
int Server::open(void)
{
    if (acceptor_.open (ACE_INET_Addr (ACE_DEFAULT_SERVER_PORT), ACE_Reactor::instance()) == -1)
        ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "open"), -1);

    return(0);
}

/* Running the server just means that we execute the basic event
   loop for the reactor.  Again, if we had a private reactor then we
   could have multiple server's in their run() method.
*/
int Server::run(void)
{
    ACE_DEBUG ((LM_DEBUG, "(%P|%t) starting up server daemon\n"));

        // Here's the basic event loop.  I have a 2-second timeout on
        // the handle_events() so that we don't have to wait too long
        // when we set the finished_ flag.
    while (!finished_)
    {
         // Some (all?) platforms return the "remaining time" in the
         // timeout parameter.  If we don't reset it each time, we
         // will end up with a 100% CPU spin loop!
        ACE_Time_Value timeout(2);

        ACE_Reactor::instance()->handle_events (&timeout);
    }

        // Close the acceptor when we're done.  This may be handled by 
        // the framework but it's good practice to be explicit about things.
    acceptor_.close();

    ACE_DEBUG ((LM_DEBUG, "(%P|%t) shutting down server daemon\n"));

    return 0;
}

/* The close() method simply sets the finished_ flag so that run()
   will leave the event loop and exit.
*/
int Server::close(void)
{
    finished_ = 1;
    ACE_Reactor::instance()->notify();
    return(0);
}

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