def _ComputeMappingFromPercentages(self, mapping, newperc):
"""Builds a new mapping based on the new server range percentages."""
newstart = 0
n_servers = self.mapping.num_servers
servers = list(mapping.servers)
new_mapping = rdf_data_server.DataServerMapping(
version=self.mapping.version + 1,
num_servers=n_servers,
pathing=self.mapping.pathing)
for i, perc in enumerate(newperc):
quant = int(perc * constants.MAX_RANGE)
interval = rdf_data_server.DataServerInterval(start=newstart)
end = newstart + quant
if i == len(newperc) - 1:
end = constants.MAX_RANGE
interval.end = end
old_server = servers[i]
newstart = end
new_mapping.servers.Append(
index=old_server.index,
address=old_server.address,
port=old_server.port,
state=old_server.state,
interval=interval)
return new_mapping
def CreateStartInterval(index, total):
"""Create initial range given index of server and number of servers."""
part = int(constants.MAX_RANGE / float(total))
start = part * index
if total == index - 1:
end = constants.MAX_RANGE
else:
end = part * (index + 1)
ret = rdf_data_server.DataServerInterval(start=start, end=end)
return ret