We are facing one problem when implementing reversed ajax call crossing users on GAE It is a game center, many client users join the game and play together. We supposed that there is a singleton Game Center instance, and all user is saved in user list within this Game Center instance. Then, if UserA did one request in game, and want to ask whether UserB accept it, then system(server side) will do one reverse ajax call to UserB to ask his response when processing UserA's request. Also, when there is any data update on user or game, we will also use reverse ajax call to push those new data to each client user in UserList which is saved in Game Center instance. Now, we understood the Game Center class will be initialized in different server (JVM), so Game Center is not singleton instance on GAE. Also we found that it is very difficult to do reverse ajax call crossing users on GAE, because we can not do reverse ajax call to client UserY who is on serverB, when system is processing request of UserX on serverA. Any idea for handling this type Reverse Ajax Solution (Comet) on GAE?
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