add ability to purge callers from queue if no agents are logged in

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@3847 65c4cc65-6c06-0410-ace0-fbb531ad65f3

CHANGES

@@ -1,3 +1,4 @@
+ -- Add ability to purge callers from queue if no agents are logged in
  -- Fix inband PRI indication detection
  -- Fix for MGCP - always request digits if no RTP stream
  -- Fixed seg fault for ast_control_streamfile

apps/app_queue.c

@@ -226,6 +226,7 @@ struct ast_call_queue {
 	int wrapped;			/* Round Robin - wrapped around? */
 	int joinempty;			/* Do we care if the queue has no members? */
 	int eventwhencalled;			/* Generate an event when the agent is called (before pickup) */
+	int leavewhenempty;		/* If all agents leave the queue, remove callers from the queue */
 
 	struct member *members;		/* Member channels to be tried */
 	struct queue_ent *head;		/* Start of the actual queue */
@@ -912,6 +913,12 @@ static int wait_our_turn(struct queue_ent *qe, int ringing)
 			break;
 		}
 
+		/* leave the queue if no agents, if enabled */
+		if (!(qe->parent->members) && qe->parent->leavewhenempty) {
+			leave_queue(qe);
+			break;
+		}
+
 		/* Make a position announcement, if enabled */
 		if (qe->parent->announcefrequency && !ringing)
 			say_position(qe);
@@ -1626,7 +1633,7 @@ check_turns:
 				/* This is the wait loop for the head caller*/
 				/* To exit, they may get their call answered; */
 				/* they may dial a digit from the queue context; */
-				/* or, they may may timeout. */
+				/* or, they may timeout. */
 
 				/* Leave if we have exceeded our queuetimeout */
 				if (qe.queuetimeout && ( (time(NULL) - qe.start) >= qe.queuetimeout) ) {
@@ -1634,6 +1641,12 @@ check_turns:
 					break;
 				}
 
+				/* leave the queue if no agents, if enabled */
+				if (!((qe.parent)->members) && (qe.parent)->leavewhenempty) {
+					leave_queue(&qe);
+					break;
+				}
+
 				/* Make a position announcement, if enabled */
 				if (qe.parent->announcefrequency && !ringing)
 					say_position(&qe);
@@ -1872,6 +1885,8 @@ static void reload_queues(void)
 						}
 					} else if (!strcasecmp(var->name, "joinempty")) {
 						q->joinempty = ast_true(var->value);
+					} else if (!strcasecmp(var->name, "leavewhenempty")) {
+						q->leavewhenempty = ast_true(var->value);
 					} else if (!strcasecmp(var->name, "eventwhencalled")) {
 						q->eventwhencalled = ast_true(var->value);
 					} else {

configs/queues.conf.sample

@@ -113,6 +113,10 @@
 ;
 ; joinempty = yes
 ;
+; If you wish to remove callers from the queue if there are no agents present, set this to yes
+;
+; leavewhenempty = yes
+;
 ; Asterisk can generate AgentCalled events when an agent is rung, if this is turned on
 ; (may generate a LOT of extra manager events)
 ;