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Constraint Programming Solver
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lib/solver/store/ets_store.ex
defmodule CPSolver.Store.ETS do
alias CPSolver.DefaultDomain, as: Domain
use CPSolver.ConstraintStore
@impl true
def create(variables, _opts \\ []) do
table_id =
:ets.new(__MODULE__, [:set, :public, read_concurrency: true, write_concurrency: false])
Enum.each(
variables,
fn var ->
:ets.insert(
table_id,
{var.id, %{id: var.id, domain: var.domain}}
)
end
)
{:ok, table_id}
end
@impl true
def dispose(_store, _vars) do
:ok
end
@impl true
def get(store, variable, operation, args \\ []) do
handle_request(:get, store, variable, operation, args)
end
@impl true
def update_domain(store, variable, operation, args) do
handle_request(:update, store, variable, operation, args)
end
@impl true
def on_change(_store, _variable, _change) do
:ok
end
@impl true
def on_fix(_store, _variable, _value) do
:ok
end
@impl true
def on_no_change(_store, _variable) do
:ok
end
@impl true
def on_fail(_store, _variable) do
:ok
end
defp update_variable_domain(
_table,
_variable,
_domain,
event
) do
event
end
@impl true
def domain(table, variable) do
table
|> lookup(variable)
|> Map.get(:domain)
end
def lookup(table, %{id: var_id} = _variable) do
lookup(table, var_id)
end
def lookup(table, var_id) do
table
|> :ets.lookup(var_id)
|> hd
|> elem(1)
end
defp handle_request(kind, table, var_id, operation, args) do
variable = lookup(table, var_id)
handle_request_impl(kind, table, variable, operation, args)
end
def handle_request_impl(:get, _table, %{domain: domain} = _variable, operation, args) do
apply(Domain, operation, [domain | args])
end
def handle_request_impl(:update, table, %{domain: domain} = variable, operation, args) do
case apply(Domain, operation, [domain | args]) do
:fail ->
update_variable_domain(table, variable, :fail, :fail)
:no_change ->
:no_change
:fixed ->
update_variable_domain(table, variable, domain, :fixed)
{domain_change, new_domain} ->
update_variable_domain(table, variable, new_domain, domain_change)
end
end
end