GSP
Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Support
Contact Us
Online Help
Handbooks
Domain Status
Man Pages

FAQ
Virtual Servers
Pricing
Billing
Technical

Network
Facilities
Connectivity
Topology Map

Miscellaneous
Server Agreement
Year 2038
Credits
 

USA Flag

 

 

Man Pages


Manual Reference Pages  -  NET::STOMP::CLIENT::HEARTBEAT (3)

.ds Aq ’

NAME

Net::STOMP::Client::HeartBeat - Heart-beat support for Net::STOMP::Client

CONTENTS

SYNOPSIS



  use Net::STOMP::Client;
  $stomp = Net::STOMP::Client->new(host => "127.0.0.1", port => 61613);
  ...
  # can set the desired configuration only _before_ connect()
  # the client can send heart-beats every 5 seconds
  $stomp->client_heart_beat(5);
  # the server should send heart-beats every 10 seconds
  $stomp->server_heart_beat(10);
  ...
  $stomp->connect();
  ...
  # can get the negotiated configuration only _after_ connect()
  printf("negotiated heart-beats: client=%.3f server=%.3f\n",
      $stomp->client_heart_beat(), $stomp->server_heart_beat());



DESCRIPTION

This module handles STOMP heart-beat negotiation. It is used internally by Net::STOMP::Client and should not be directly used elsewhere.

METHODS

This module provides the following methods to Net::STOMP::Client:
client_heart_beat([VALUE]) get/set the client heart-beat
server_heart_beat([VALUE]) get/set the server heart-beat
last_received() get the time at which data was last received, i.e. read from the network socket
last_sent() get the time at which data was last sent, i.e. written to the network socket
beat([OPTIONS]) send a NOOP frame (using the noop() method) unless the last sent time is recent enough with regard to the client heart-beat settings
For consistency with other Perl modules (for instance Time::HiRes), time is always expressed as a fractional number of seconds.

HEART-BEATING

Starting with STOMP 1.1, each end of a STOMP connection can check if the other end is alive via heart-beating.

In order to use heart-beating (which is disabled by default), the client must specify what it wants before sending the CONNECT frame. This can be done using the client_heart_beat and server_heart_beat options of the new() method or, this is equivalent, the client_heart_beat() and server_heart_beat() methods on the Net::STOMP::Client object.

After having received the CONNECTED frame, the client_heart_beat() and server_heart_beat() methods can be used to get the negotiated values.

To prove that it is alive, the client just needs to call the beat() method when convenient.

To check if the server is alive, the client just needs to compare the current time and what is returned by the last_received() and server_heart_beat() methods. For instance:



  $delta = $stomp->server_heart_beat();
  if ($delta) {
      $inactivity = Time::HiRes::time() - $stomp->last_received();
      printf("server looks dead!\n") if $inactivity > $delta;
  }



SEE ALSO

Net::STOMP::Client, Time::HiRes.

AUTHOR

Lionel Cons <http://cern.ch/lionel.cons>

Copyright (C) CERN 2010-2013

Search for    or go to Top of page |  Section 3 |  Main Index


perl v5.20.3 NET::STOMP::CLIENT::HEARTBEAT (3) 2013-11-28

Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with manServer 1.07.