feat(MainDb): add a weak list of event references

src/core/core.h

@@ -38,6 +38,7 @@ class LINPHONE_PUBLIC Core : public Object {
 	friend class ChatRoom;
 	friend class ClientGroupChatRoom;
 	friend class MainDb;
+	friend class MainDbEventKey;
 
 public:
 	L_OVERRIDE_SHARED_FROM_THIS(Core);

src/db/main-db-event-key.cpp

@@ -17,7 +17,9 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  */
 
+#include "core/core-p.h"
 #include "main-db-event-key-p.h"
+#include "main-db-p.h"
 
 // =============================================================================
 
@@ -44,9 +46,10 @@ MainDbEventKey::MainDbEventKey (const MainDbEventKey &src) : MainDbEventKey() {
 }
 
 MainDbEventKey::~MainDbEventKey () {
-	if (isValid()) {
-		// TODO: Remove key from main db references if necessary.
-	}
+	L_D();
+
+	if (isValid())
+		d->core.lock()->getPrivate()->mainDb->getPrivate()->storageIdToEvent.erase(d->storageId);
 }
 
 MainDbEventKey &MainDbEventKey::operator= (const MainDbEventKey &src) {

src/db/main-db-p.h

@@ -31,6 +31,9 @@ LINPHONE_BEGIN_NAMESPACE
 class Content;
 
 class MainDbPrivate : public AbstractDbPrivate {
+public:
+	std::unordered_map<long long, std::weak_ptr<EventLog>> storageIdToEvent;
+
 private:
 	// ---------------------------------------------------------------------------
 	// Low level API.

src/db/main-db.cpp

@@ -833,8 +833,10 @@ MainDb::MainDb (const shared_ptr<Core> &core) : AbstractDb(*new MainDbPrivate),
 
 		L_END_LOG_EXCEPTION
 
-		if (soFarSoGood)
+		if (soFarSoGood) {
 			dEventLog->dbKey = MainDbEventKey(getCore(), storageId);
+			d->storageIdToEvent[storageId] = eventLog;
+		}
 
 		return soFarSoGood;
 	}

src/db/main-db.h

@@ -36,6 +36,8 @@ class EventLog;
 class MainDbPrivate;
 
 class MainDb : public AbstractDb, public CoreAccessor {
+	friend class MainDbEventKey;
+
 public:
 	enum Filter {
 		NoFilter = 0x0,