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// $Id$
// server.cpp (written by Tim Harrison)
// Listens to multicast address for client log messages. Prints
// Mbits/sec received from client.
#include "ace/OS_main.h"
#include "ace/SOCK_Dgram.h"
#include "ace/INET_Addr.h"
#include "ace/SOCK_Dgram_Mcast.h"
#include "ace/Reactor.h"
#include "ace/Log_Msg.h"
#include "Log_Wrapper.h"
#include "ace/OS_NS_string.h"
#include "ace/OS_NS_unistd.h"
#include "ace/os_include/os_netdb.h"
ACE_RCSID(Multicast, server, "$Id$")
#if defined (ACE_HAS_IP_MULTICAST)
class Server_Events : public ACE_Event_Handler
{
public:
Server_Events (u_short port,
const char *mcast_addr,
long time_interval = 0);
~Server_Events (void);
virtual int handle_input (ACE_HANDLE fd);
virtual int handle_timeout (const ACE_Time_Value &tv,
const void *arg);
virtual ACE_HANDLE get_handle (void) const;
ACE_Time_Value *wait_time (void);
private:
char *message_;
Log_Wrapper::Log_Record *log_record_;
char buf_[4 * BUFSIZ];
char hostname_[MAXHOSTNAMELEN];
int initialized_;
int count_;
long interval_;
// time interval to log messages
ACE_Time_Value *how_long_;
ACE_Reactor *reactor_;
ACE_SOCK_Dgram_Mcast mcast_dgram_;
ACE_INET_Addr remote_addr_;
ACE_INET_Addr mcast_addr_;
// = statistics on messages received
double total_bytes_received_;
int total_messages_received_;
int last_sequence_number_;
};
static const char MCAST_ADDR[] = ACE_DEFAULT_MULTICAST_ADDR;
static const int UDP_PORT = ACE_DEFAULT_MULTICAST_PORT;
static const int DURATION = 5;
ACE_HANDLE
Server_Events::get_handle (void) const
{
return this->mcast_dgram_.get_handle ();
}
ACE_Time_Value *
Server_Events::wait_time (void)
{
return this->how_long_;
}
Server_Events::Server_Events (u_short port,
const char *mcast_addr,
long time_interval)
: initialized_ (0),
count_ (1),
interval_ (time_interval),
mcast_addr_ (port, mcast_addr),
total_bytes_received_ (0)
{
// Use ACE_SOCK_Dgram_Mcast factory to subscribe to multicast group.
if (ACE_OS::hostname (this->hostname_,
MAXHOSTNAMELEN) == -1)
ACE_ERROR ((LM_ERROR,
"%p\n",
"hostname"));
else if (this->mcast_dgram_.subscribe (this->mcast_addr_) == -1)
ACE_ERROR ((LM_ERROR,
"%p\n",
"subscribe"));
else
{
// Point to NULL so that we block in the beginning.
this->how_long_ = 0;
this->log_record_ = (Log_Wrapper::Log_Record *) &buf_;
this->message_ = &buf_[sizeof (Log_Wrapper::Log_Record)];
}
}
// A destructor that emacs refuses to color blue ;-)
Server_Events::~Server_Events (void)
{
this->mcast_dgram_.unsubscribe ();
ACE_DEBUG ((LM_DEBUG,
"total bytes received = %d after %d second\n",
this->total_bytes_received_,
this->interval_));
ACE_DEBUG ((LM_DEBUG,
"Mbits/sec = %.2f\n",
(float) (total_bytes_received_ * 8 / (float) (1024*1024*interval_))));
ACE_DEBUG ((LM_DEBUG,
"last sequence number = %d\ntotal messages received = %d\ndiff = %d\n",
this->last_sequence_number_,
this->total_messages_received_,
this->last_sequence_number_ - total_messages_received_));
}
int
Server_Events::handle_timeout (const ACE_Time_Value &,
const void *arg)
{
ACE_DEBUG ((LM_DEBUG, "\t%d timeout%s occurred for %s.\n",
this->count_,
this->count_ == 1 ? "" : "s",
(char *) arg));
// Don't let the timeouts continue if there's no activity since
// otherwise we use up a lot of CPU time unnecessarily.
if (this->count_ == 5)
{
reactor ()->cancel_timer (this);
this->initialized_ = 0;
ACE_DEBUG ((LM_DEBUG,
"\tcancelled timeout for %s to avoid busy waiting.\n",
(char *) arg));
}
this->count_++;
return 0;
}
int
Server_Events::handle_input (ACE_HANDLE)
{
// Receive message from multicast group.
iovec iovp[2];
iovp[0].iov_base = buf_;
iovp[0].iov_len = sizeof (log_record_);
iovp[1].iov_base = &buf_[sizeof (log_record_)];
iovp[1].iov_len = 4 * BUFSIZ - sizeof (log_record_);
ssize_t retcode =
this->mcast_dgram_.recv (iovp,
2,
this->remote_addr_);
if (retcode != -1)
{
total_messages_received_++;
total_bytes_received_ += retcode;
last_sequence_number_ =
ntohl (log_record_->sequence_number);
for (char *message_end = this->message_ + ACE_OS::strlen (this->message_) - 1;
ACE_OS::strchr ("\r\n \t", *message_end) != 0;
)
{
*message_end-- = '\0';
if (message_end == this->message_)
break;
}
ACE_DEBUG ((LM_DEBUG,
"sequence number = %d\n",
last_sequence_number_));
ACE_DEBUG ((LM_DEBUG,
"message = '%s'\n",
this->message_));
if (this->initialized_ == 0)
{
// Restart the timer since we've received events again.
if (reactor()->schedule_timer (this,
(void *) this->hostname_,
ACE_Time_Value::zero,
ACE_Time_Value (DURATION)) == -1)
ACE_ERROR_RETURN ((LM_ERROR,
"%p\n",
"schedule_timer"),
-1);
this->initialized_ = 1;
}
this->count_ = 1;
return 0;
}
else
return -1;
}
int
ACE_TMAIN (int, ACE_TCHAR *[])
{
// Instantiate a server which will receive messages for DURATION
// seconds.
Server_Events server_events (UDP_PORT,
MCAST_ADDR,
DURATION);
// Instance of the ACE_Reactor.
ACE_Reactor reactor;
if (reactor.register_handler (&server_events,
ACE_Event_Handler::READ_MASK) == -1)
ACE_ERROR ((LM_ERROR,
"%p\n%a",
"register_handler",
1));
ACE_DEBUG ((LM_DEBUG,
"starting up server\n"));
for (;;)
reactor.handle_events (server_events.wait_time ());
ACE_NOTREACHED (return 0;)
}
#else
int
ACE_TMAIN (int, ACE_TCHAR *argv[])
{
ACE_ERROR_RETURN ((LM_ERROR,
"error: %s must be run on a platform that support IP multicast\n",
argv[0]), -1);
}
#endif /* ACE_HAS_IP_MULTICAST */
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