FIFO System To-Do

[jyotsana-gupta]

In frontend.services.FIFOOrderSys, code for adding requests to queue, sending requests to leader, removing requests from queue.

In replica1.services.impl.FIFOBroadcastSys:
~ code for broadcasting request to secondary RM's
~ method setSecServerDetails(List<String[]> secServerDetails): secServerDetails will hold a list of arrays (each array will have 2 elements: hostname and port number). These arrays will give details of the secondary RM's when a new leader is elected.
~ method getSecServerDetails: to fetch the secondary RM details. This should be called before EVERY broadcast to get the latest RM details.
~ setSecServerDetails and getSecServerDetails should have their code blocks synchronized. Check replica1.services.impl.ReplicaMgrService.setIsLeader() and getIsLeader() for reference.

Same for replica2 and replica3.