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lib/cassandra/load_balancing/policy.ex
defprotocol Cassandra.LoadBalancing.Policy do
@moduledoc """
Protocol to specify a load balancing policy
"""
@doc """
Selects from a list of `connections` for the `request`
Returns a sorted list of `connections` to use for executing the `request`
"""
def select(balancer, connections, request)
@doc """
Returns number of connections to open to the `host`
"""
def count(balancer, host)
end