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Constraint Programming Solver
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lib/solver/store/store.ex
defmodule CPSolver.ConstraintStore do
@moduledoc """
Constraint store is a key-value store, where `key` is a variable id,
and `value` is a implementation-dependent structure that allows to
update and keep track of variables' domains.
"""
#################
alias CPSolver.Common
alias CPSolver.Variable
@type get_operation :: Common.domain_get_operation() | nil
@type update_operation :: Common.domain_update_operation()
def default_store() do
CPSolver.Store.Local
end
### Callbacks
## Tell basic constraints (a.k.a, domains) to a constraint store
@callback create(variables :: Enum.t(), opts :: Keyword.t()) ::
{:ok, any()} | {:error, any()}
## Get variable details
@callback get(store :: any(), variable :: Variable.t(), get_operation(), [any()]) ::
{:ok, any()} | {:error, any()}
@callback update(store :: any(), variable :: Variable.t(), update_operation(), [any()]) ::
any()
@callback update_domain(store :: any(), variable :: Variable.t(), update_operation(), [any()]) ::
any()
@callback dispose(store :: any(), variables :: [Variable.t()]) :: :ok | :not_found
@callback domain(store :: any(), variable :: Variable.t()) :: {:ok, any()} | {:error, any()}
@callback on_fail(store :: any(), variable :: Variable.t()) :: any()
@callback on_no_change(store :: any(), variable :: Variable.t()) :: any()
@callback on_change(
store :: any(),
variable :: Variable.t(),
change :: :fixed | :min_change | :max_change | :domain_change
) :: any()
@callback get_variables(store :: any()) :: [any()]
@callback subscribe(
store :: any(),
subscriptions :: [%{pid: pid(), variable: any(), events: [any()]}]
) :: :ok | :not_found
### API
defmacro __using__(_) do
quote do
@behaviour CPSolver.ConstraintStore
@domain_changes CPSolver.Common.domain_changes()
require Logger
def update(store, variable, operation, args) do
update_domain(store, variable, operation, args)
|> tap(fn
:fail -> on_fail(store, variable)
:no_change -> on_no_change(store, variable)
change when change in @domain_changes -> on_change(store, variable, change)
end)
end
defoverridable update: 4
end
end
def create_store(variables, store_impl \\ default_store()) do
{:ok, store_instance} = store_impl.create(variables)
{:ok,
Enum.map(variables, fn var ->
var
|> Map.put(:id, var.id)
|> Map.put(:name, var.name)
|> Map.put(:store, store_instance)
end), store_instance, store_impl}
end
end