/*
* Copyright 2014 Red Hat, Inc. and/or its affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.optaplanner.core.impl.domain.variable.supply;
/**
* Provides a {@link Supply} for subsystems that submit a {@link Demand}.
*/
public interface SupplyManager {
/**
* Returns the {@link Supply} for a {@link Demand}, preferably an existing one.
* If the {@link Supply} doesn't exist yet (as part of the domain model or externalized), it creates and attaches it.
* @param demand never null
* @param <S> Subclass of {@link Supply}
* @return never null
*/
<S extends Supply> S demand(Demand<S> demand);
}