Store the last user message into the chatroom user data. This should speed up the display of the last message in the ChatView and prevent useless multiple calls to get_history() (which goes into SQLite).

Classes/ChatTableViewController.m

@@ -50,10 +50,8 @@
 #pragma mark - 
 
 static int sorted_history_comparison(LinphoneChatRoom *to_insert, LinphoneChatRoom *elem){
-    MSList*                   new_history  = linphone_chat_room_get_history(to_insert, 1);
-    LinphoneChatMessage* last_new_message  = new_history? new_history->data : NULL;
-    MSList*                  elem_history  = linphone_chat_room_get_history(elem, 1);
-    LinphoneChatMessage* last_elem_message = elem_history?elem_history->data:NULL;
+    LinphoneChatMessage* last_new_message  = linphone_chat_room_get_user_data(to_insert);
+    LinphoneChatMessage* last_elem_message = linphone_chat_room_get_user_data(elem);
 
     if( last_new_message && last_elem_message ){
         time_t new = linphone_chat_message_get_time(last_new_message);
@@ -70,13 +68,36 @@ static int sorted_history_comparison(LinphoneChatRoom *to_insert, LinphoneChatRo
     MSList* iter     = unsorted;
 
     while (iter) {
-        sorted = ms_list_insert_sorted(sorted, iter->data, (MSCompareFunc)sorted_history_comparison);
+        // store last message in user data
+        MSList*               history = linphone_chat_room_get_history(iter->data, 1);
+        LinphoneChatMessage* last_msg = history? history->data : NULL;
+        if( last_msg ){
+            linphone_chat_room_set_user_data(iter->data, linphone_chat_message_ref(last_msg));
+        }
+        ms_list_free_with_data(history, (void (*)(void *))linphone_chat_message_unref);
+
+        sorted = ms_list_insert_sorted(sorted,
+                                       linphone_chat_room_ref(iter->data),
+                                       (MSCompareFunc)sorted_history_comparison);
+
         iter = iter->next;
     }
     return sorted;
 }
 
+static void chatTable_free_chatrooms(void *data){
+    LinphoneChatMessage* lastMsg = linphone_chat_room_get_user_data(data);
+    if( lastMsg ){
+        linphone_chat_message_unref(linphone_chat_room_get_user_data(data));
+        linphone_chat_room_set_user_data(data, NULL);
+    }
+    linphone_chat_room_unref(data);
+}
+
 - (void)loadData {
+    if( data != NULL ){
+        ms_list_free_with_data(data, chatTable_free_chatrooms);
+    }
     data = [self sortChatRooms];
     [[self tableView] reloadData];
 }
@@ -97,7 +118,6 @@ static int sorted_history_comparison(LinphoneChatRoom *to_insert, LinphoneChatRo
     if (cell == nil) {
         cell = [[[UIChatCell alloc] initWithIdentifier:kCellId] autorelease];
         
-        
         // Background View
         UACellBackgroundView *selectedBackgroundView = [[[UACellBackgroundView alloc] initWithFrame:CGRectZero] autorelease];
         cell.selectedBackgroundView = selectedBackgroundView;
@@ -137,12 +157,13 @@ static int sorted_history_comparison(LinphoneChatRoom *to_insert, LinphoneChatRo
 
         LinphoneChatRoom *chatRoom = (LinphoneChatRoom*)ms_list_nth_data(data, (int)[indexPath row]);
         linphone_chat_room_delete_history(chatRoom);
-        linphone_chat_room_destroy(chatRoom);
-        data = linphone_core_get_chat_rooms([LinphoneManager getLc]);
+        linphone_chat_room_unref(chatRoom);
+
+        // will force a call to [self loadData]
+        [[NSNotificationCenter defaultCenter] postNotificationName:kLinphoneTextReceived object:self];
 
         [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
         [tableView endUpdates];
-        [[NSNotificationCenter defaultCenter] postNotificationName:kLinphoneTextReceived object:self];
     }
 }
 

Classes/ChatViewController.m

@@ -67,7 +67,6 @@
     if([tableController isEditing])
         [tableController setEditing:FALSE animated:FALSE];
     [editButton setOff];
-    [tableController loadData];
 }
 
 - (void)viewWillDisappear:(BOOL)animated {

Classes/LinphoneUI/UIChatCell.m

@@ -75,30 +75,6 @@
     return [NSString stringWithFormat:@"%@ - %@ (%ld)", addressLabel.text, chatContentLabel.text, (long)[unreadMessageLabel.text integerValue]];
 }
 
-- (LinphoneChatMessage*)getLastIncomingMessage {
-    LinphoneChatMessage* last_message = nil;
-    MSList* last_message_list = linphone_chat_room_get_history(chatRoom, 20);
-    MSList* iterator = nil;
-
-    // find last element of the list:
-    iterator = last_message_list;
-    while (iterator && iterator->next) {
-        iterator = iterator->next;
-    }
-
-    // walk the list in reverse to find the last incoming message
-    while (iterator) {
-        LinphoneChatMessage* msg = iterator->data;
-        if( !linphone_chat_message_is_outgoing(msg)){
-            last_message = msg;
-            break;
-        }
-        iterator = iterator->prev;
-    }
-    ms_list_free(last_message_list);
-
-    return last_message;
-}
 
 - (void)update {
 	NSString *displayName = nil;
@@ -133,7 +109,7 @@
     }
     [avatarImage setImage:image];
 
-    LinphoneChatMessage* last_message = [self getLastIncomingMessage];
+    LinphoneChatMessage* last_message = linphone_chat_room_get_user_data(chatRoom);
 
     if( last_message ){