func (svr *Store) Upgrade(args *echoproto.Args, reply *echoproto.Reply) error {
svr.Lock.Lock()
reply.Data = svr.Log
svr.Lock.Unlock()
return nil
}
// RPC interface for the Paxos protocol.
func (svr *Server) Prepare(args *echoproto.Args, reply *echoproto.Reply) error {
svr.Lock.Lock()
if args.N >= svr.N_high {
svr.N_high = args.N
reply.Response = echoproto.PREPARE_OK
} else {
reply.Response = echoproto.PREPARE_REJECT
}
svr.info("Prepare()")
svr.Lock.Unlock()
return nil
}
func (svr *Server) Accept(args *echoproto.Args, reply *echoproto.Reply) error {
svr.Lock.Lock()
if args.N >= svr.N_high {
svr.N_high = args.N
svr.N_accept = args.N
svr.V_accept = args.V
reply.Response = echoproto.ACCEPT_OK
} else {
reply.Response = echoproto.ACCEPT_REJECT
}
svr.info("Accept()")
svr.Lock.Unlock()
return nil
}
func (svr *Server) Commit(args *echoproto.Args, reply *echoproto.Reply) error {
svr.Lock.Lock()
svr.Log = append(svr.Log, args.V)
// echo the response to the client
reply.Data = nil
reply.Data = append(reply.Data, args.V)
svr.N_high = -1
svr.N_accept = -1
svr.V_accept = ""
svr.info("Commit()")
svr.Lock.Unlock()
return nil
}
func (svr *Server) FetchLog(args *echoproto.Args, reply *echoproto.Reply) error {
svr.Lock.Lock()
// increment the Lamport timestamp and copy the current version of the log
svr.update()
reply.Data = svr.Log
svr.info("FetchLog()")
svr.Lock.Unlock()
return nil
}