DSM: adds onBeforeDestroy event handler to modules

apps/dsm/DSMCall.cpp

@@ -341,6 +341,10 @@ void DSMCall::onSystemEvent(AmSystemEvent* ev) {
   }
 }
 
+void DSMCall::onBeforeDestroy() {
+  engine.onBeforeDestroy(this, this);
+}
+
 void DSMCall::process(AmEvent* event)
 {
 

apps/dsm/DSMCall.h

@@ -81,6 +81,7 @@ public:
   void onCancel();
   void onBye(const AmSipRequest& req);
   void onDtmf(int event, int duration_msec);
+  void onBeforeDestroy();
 
   void onSipRequest(const AmSipRequest& req);
   void onSipReply(const AmSipReply& reply, int old_dlg_status, const string& trans_method);

apps/dsm/DSMModule.h

@@ -51,6 +51,7 @@ class DSMModule {
 
   virtual int preload() { return 0; }
   virtual bool onInvite(const AmSipRequest& req, DSMSession* sess) { return true; }
+  virtual void onBeforeDestroy(DSMSession* sc_sess, AmSession* sess) { }
 };
 
 typedef map<string,string> EventParamT;

apps/dsm/DSMStateEngine.cpp

@@ -218,6 +218,11 @@ bool DSMStateEngine::onInvite(const AmSipRequest& req, DSMSession* sess) {
 
   return res;
 }
+void DSMStateEngine::onBeforeDestroy(DSMSession* sc_sess, AmSession* sess) {
+  for (vector<DSMModule*>::iterator it =
+	 mods.begin(); it != mods.end(); it++)
+    (*it)->onBeforeDestroy(sc_sess, sess);
+}
 
 bool DSMStateEngine::runactions(vector<DSMAction*>::iterator from, 
 				vector<DSMAction*>::iterator to, 

apps/dsm/DSMStateEngine.h

@@ -249,6 +249,7 @@ class DSMStateEngine {
 
   /** @return whether call should be accepted */
   bool onInvite(const AmSipRequest& req, DSMSession* sess);
+  void onBeforeDestroy(DSMSession* sc_sess, AmSession* sess);
 };
 
 extern void varPrintArg(const AmArg& a, map<string, string>& dst, const string& name);