CAF: CTBCMCTimer - Revision history

Abrassard: Added recommendation to use the "simplified" timer API

2016-04-21T13:03:11Z

Added recommendation to use the "simplified" timer API

Abrassard: /* Example code */

2011-03-03T14:43:01Z

Example code

Abrassard: /* Example code */

2011-03-03T14:42:45Z

Example code

Abrassard: Created page with '=== CTBCMCTimer class === The ''CTBCMCTimer'' class is used to spawn timers attached to call legs. CTBCMCTimer( TBCMC_LEG_ID in_LegId ) This constructor creates a new timer ob…'

2011-03-03T14:41:37Z

Created page with '=== CTBCMCTimer class === The ''CTBCMCTimer'' class is used to spawn timers attached to call legs. CTBCMCTimer( TBCMC_LEG_ID in_LegId ) This constructor creates a new timer ob…'

New page

=== CTBCMCTimer class ===
The ''CTBCMCTimer'' class is used to spawn timers attached to call legs.
CTBCMCTimer( TBCMC_LEG_ID in_LegId )
This constructor creates a new timer object bound to a call leg, but that's not yet kicked (doing nothing for now).

CTBCMCTimer( TBCMC_LEG_ID in_LegId, TBX_UINT32 in_un32TimeoutMs, TBX_UINT32 in_un32TimeoutEventCause )
This constructor creates a new timer object bound to a call leg,
and immediately "kicks" that timer so it expire in "in_un32TimeoutMs" milliseconds with cause in_un32TimeoutEventCause.

Kick( TBX_UINT32 in_un32TimeoutMs, TBX_UINT32 in_un32TimeoutEventCause )
This function will cancel previously kicked timer,
then "kicks" that timer so it expire in "in_un32TimeoutMs" milliseconds with cause in_un32TimeoutEventCause.

Cancel()
This function cancels a timer that had previously been kicked

=== Using the timer within a ''CTBCAFCallFlow'' or ''CTBCAFCallBehavior'' object ===
The ''CTBCMCTimer'' is bound to a call leg. When it expires, it will cause ''OnLegEvent'' to be called on the ''CTBCAFCallFlow'' that owns that call leg, and also on all behaviors attached to that call flow.
The event will be of type ''TBCMC_LEG_EVENT_TYPE_TIMEOUT'', and the event cause will be equal to the value of ''in_un32TimeoutEventCause'' passed when the timer was kicked.

=== Destroying the timer object ===
The timer object must be destroyed (or at least canceled) at most upon ''OnLegFreed''.
In fact, if not canceled at that point, it will cause error traces in the CAF library due to timer expiring for unknown call leg.

=== Example code ===
Define a unique timer cause:
#define MY_CTBCMC_TIMER_CAUSE CTBCAF_MSG_ID_GEN(TBX_ID_CLASS_TBCMC_TIMER_ID_USER_APP, 0x01)
#define MY_OTHER_CTBCMC_TIMER_CAUSE CTBCAF_MSG_ID_GEN(TBX_ID_CLASS_TBCMC_TIMER_ID_USER_APP, 0x02)

Creating and kicking the timer:
mpExampleTimer = tbnew CTBCMCTimer
(
in_pCallLeg->GetLegId(),
15000, /* Timeout in 15 seconds */
MY_CTBCMC_TIMER_CAUSE
);

Destroying the timer, upon leg destruction, in case it did not timeout:
TBX_RESULT MyCallFlowOrBehavior::OnLegFreed( PCTBCAFCallLeg in_pCallLeg, PITBCAFCallFlow* io_ppThis )
(
IN PCTBCAFCallLeg in_pCallLeg,
IN_OUT PITBCAFCallFlow* io_ppThis
)
{
if( mpExampleTimer )
{
delete mpExampleTimer;
mpExampleTimer = NULL;
}
// Call default leg terminated implementation (mandatory)
return CTBCAFCallBehavior::OnLegFreed(in_pCallLeg, io_ppThis);
}

Handling expired timer:
TBX_RESULT MyCallFlowOrBehavior::OnLegEvent( PCTBCAFCallLeg in_pCallLeg, PITBCMCLegEvent in_pEvent )
{
TBX_BOOL fConsumed = TBX_FALSE;
if( in_pEvent->GetType() == TBCMC_LEG_EVENT_TYPE_TIMEOUT )
{
if( in_pEvent->GetCause() != MY_CTBCMC_TIMER_CAUSE )
{
// My timer expired, do something
fConsumed = TBX_TRUE;
}
}
if( !fConsumed )
{
// Event was not for us, forward to next behavior in the chain
return mpCallInterface->OnLegEvent( in_pCallLeg, in_pEvent );
}
}

← Older revision		Revision as of 13:03, 21 April 2016
Line 1:		Line 1:
		+	=== Recommended timer API within CTBCAFCallFlow or CTBCAFCallBehavior ===
		+	Before you read information about CTBCMCTimer below, please note that Toolpack 2.9 and above provide a much simplified mechanism for managing timers in CAF call flow or behaviors.
		+
		+	With these simplified timers, it's no more necessary to "manually" deal with timer allocation and de-allocation, and it's no more dangerous to leak memory or timers, and cause crashes if timers are not properly canceled upon leg termination.
		+	For these reasons, we highly encourage developers to use this "simplified" timer API.
		+
		+	Here are the "simplified" timer functions.
		+
		+	==== StartCallTimer ====
		+	This method allows to start a call flow timer, either attached to a given leg (timer is automatically canceled when the leg is terminated), or to the call flow in general (timer will remain valid until the last leg of the call flow is terminated).
		+
		+	The timer can also be periodic (will be called multiple times until it's canceled)
		+
		+	==== FindCallTimer ====
		+	Allows to find a previously started timer
		+
		+	==== CancelCallTimer ====
		+	Allows to cancel a timer
		+
		+	==== Timer expiration ====
		+	When the timer reaches the expiration delay, '''OnLegEvent''' is called with event type '''TBCMC_EVENT_TYPE_TIMEOUT''' and the cause specified through '''StartCallTimer'''.
		+
	=== CTBCMCTimer class ===		=== CTBCMCTimer class ===
	The ''CTBCMCTimer'' class is used to spawn timers attached to call legs.		The ''CTBCMCTimer'' class is used to spawn timers attached to call legs.

@@ Line 61: / Line 61: @@
+      {
         // My timer expired, do something
+       DoSomething();
         // Destroy the timer (in this example we don't need to kick it anymore)
         if( mpExampleTimer )