call: emit signal on removal

The "OVER" event is the point in time from which the daemon won't know
about this call ID anymore.
There is always exactly one OVER event when a call is removed.

Tuleap: #102
Change-Id: Id11b9047b27c33258b731f7843fd7241e4c7c07f

src/call.cpp

@@ -56,8 +56,10 @@ Call::~Call()
 void
 Call::removeCall()
 {
+    auto this_ = shared_from_this();
     Manager::instance().callFactory.removeCall(*this);
     iceTransport_.reset();
+    setState(CallState::OVER);
 }
 
 const std::string&
@@ -86,6 +88,11 @@ Call::validStateTransition(CallState newState)
     // Notice to developper:
     // - list only permitted transition (return true)
     // - let non permitted ones as default case (return false)
+
+    // always permited
+    if (newState == CallState::OVER)
+        return true;
+
     switch (callState_) {
         case CallState::INACTIVE:
             switch (newState) {
@@ -219,6 +226,9 @@ Call::getStateStr() const
                     return StateEvent::INACTIVE;
             }
 
+        case CallState::OVER:
+            return StateEvent::OVER;
+
         case CallState::MERROR:
         default:
             return StateEvent::FAILURE;

src/call.h

@@ -84,7 +84,7 @@ class Call : public Recordable, public std::enable_shared_from_this<Call> {
          * \note modify validStateTransition/getStateStr if this enum changes
          */
         enum class CallState : unsigned {
-            INACTIVE, ACTIVE, HOLD, BUSY, MERROR, COUNT__
+            INACTIVE, ACTIVE, HOLD, BUSY, MERROR, OVER, COUNT__
         };
 
         virtual ~Call();

src/dring/call_const.h

@@ -36,6 +36,7 @@ constexpr static char FAILURE                  [] = "FAILURE"            ;
 constexpr static char HOLD                     [] = "HOLD"               ;
 constexpr static char UNHOLD                   [] = "UNHOLD"             ;
 constexpr static char INACTIVE                 [] = "INACTIVE"           ;
+constexpr static char OVER                     [] = "OVER"               ;
 
 }