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README

1. timer module

Tomas Mandys

   Iptel.org

   Copyright © 2007 iptelorg GmbH
     __________________________________________________________________

   1.1. Overview
   1.2. Dependencies
   1.3. ABNF syntax
   1.4. Parameters

        1.4.1. declare_timer (string)

   1.5. Functions

        1.5.1. timer_enable(timer_id, enable_disable)
        1.5.2. @timer.timer.timer_id.enabled
        1.5.3. @timer.executed

   1.6. Examples

1.1. Overview

   The module supports triggering specific route block on timer.

1.2. Dependencies

   none

1.3. ABNF syntax

        timer_id = alphanum
        slow_fast = "slow" | "fast"
        declare_timer_syntax = timer_id "=" (route#|route_name) "," interval ","
 slow_fast "," ["enable"]
        enable_disable = "0" | "1"

1.4. Parameters

1.4.1. declare_timer (string)

   Declares timer route which will be called in specific interval.

   The format is:
                        declare_timer = declare_timer_syntax

   timer_id is timer identifier, route is handler to be called when timer
   is triggered, interval is timer interval in milliseconds, slow_fast
   determines if handler will be hooked in slow or fast timer queue, fast
   timer handler returns as quickly as possible, slow timer handler may
   spend longer time, see ser/doc/timers.txt documentation. Use enable to
   enable timer when ser is starting, otherwise use timer_enable to start
   it later.

   Example 1. Example declare_timer
        ...
        modparam("timer", "declare_timer", "MY_TIMER=MY_TIMER_ROUTE,10,slow,enab
le");
        ...

1.5. Functions

1.5.1.  timer_enable(timer_id, enable_disable)

   Enable/disable timer route specified by timer_id. Because of timer core
   API the callback is not disabled immediately but is removed from
   handler by itself not to decrease performance. Disabling and enabling
   in sequence may be tricky. timer_id references to timer declared by
   declare_timer.

   Example 2. timer_enable usage
        ...
        timer_enable("MY_TIMER", 1);
        ...

1.5.2.  @timer.timer.timer_id.enabled

   Return true ("1") if timer specified by timer_id is enabled, otherwise
   returns false ("0").

   Example 3. timer.timer.timer_id.enabled usage
        if (@timer.timer.MY_TIMER.enabled == "1") {
        ....
        }

1.5.3.  @timer.executed

   Returns name of timer which has been executed, i.e. non empty value is
   returned only when handler is being processed.

   Example 4. timer.executed usage
        if (@timer.executed != "") {
                # timer is being handled
        ....
        }

1.6. Examples

   Example 5. timer common example
loadmodule "modules/xlog/xlog.so"
loadmodule "modules/timer/timer.so"

modparam("timer", "declare_timer", "tmr1=ONTIMER,1000");
modparam("timer", "declare_timer", "tmr2=ONTIMER2,2000,slow,enable");

route["print"] {
        xlog("L_INFO", "fired: %@timer.executed\n");
}

route["ONTIMER"] {
        # do something
        route("print");}


route["ONTIMER2"] {
        # do something
        timer_enable("tmr1", 0);
        route("print");
}

   Example 6. Using timer module for testing a functionality

   The timer module may be used to test a functionality being developed
   and not requiring real request.A developer may put tested code in route
   section which is called once after ser starts.
loadmodule "timer";
loadmodule "xlog";

modparam("timer", "declare_timer", "TIMER_TEST=TEST,100,,enable");

route {
        xlog("L_E","main route");
}

route[TEST] {
        timer_enable("TIMER_TEST", "0");
        xlog("L_E","test start\n");

        # add here tested functionality

        xlog("L_E","test end\n");
}
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