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Constraint Programming Solver
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lib/solver/store/persistent_store.ex
defmodule CPSolver.Store.PersistentTerm do
alias CPSolver.DefaultDomain, as: Domain
use CPSolver.ConstraintStore
@impl true
def create(variables, _opts \\ []) do
ref = make_ref()
:persistent_term.put(
ref,
Map.new(variables, fn var -> {var.id, var.domain} end)
)
{:ok, ref}
end
@impl true
def dispose(term_ref, _vars) do
:persistent_term.erase(term_ref)
end
@impl true
def get(term_ref, variable, operation, args \\ []) do
handle_request(:get, term_ref, variable, operation, args)
end
@impl true
def update_domain(term_ref, variable, operation, args) do
handle_request(:update, term_ref, 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(
domain,
event
) do
case event do
:fixed -> {:fixed, Domain.min(domain)}
event -> event
end
end
@impl true
def domain(term_ref, variable) do
:persistent_term.get(term_ref) |> Map.get(variable.id)
end
def handle_request(kind, term_ref, variable, operation, args) do
handle_request_impl(kind, domain(term_ref, variable), operation, args)
end
def handle_request_impl(:get, domain, operation, args) do
apply(Domain, operation, [domain | args])
end
def handle_request_impl(:update, domain, operation, args) do
case apply(Domain, operation, [domain | args]) do
:fail ->
update_variable_domain(:fail, :fail)
# throw(:fail)
:no_change ->
:no_change
:fixed ->
update_variable_domain(domain, :fixed)
{domain_change, new_domain} ->
update_variable_domain(new_domain, domain_change)
end
end
end