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Flight assignment process and optimization

There is a newer version: 1.21.0.Final

/*
 * Copyright 2020 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.kie.kogito.examples.service;

import javax.enterprise.context.ApplicationScoped;
import javax.inject.Inject;
import javax.inject.Named;

import org.kie.kogito.examples.domain.Flight;
import org.kie.kogito.process.Process;
import org.kie.kogito.process.ProcessInstance;
import org.kie.kogito.process.impl.Sig;
import org.optaplanner.core.api.solver.SolverManager;

@ApplicationScoped
public class FlightSeatingSolveService {

    @Inject
    SolverManager solverManager;

    @Inject
    @Named("flights")
    Process process;

    public void assignSeats(String id, Flight problem) {
        solverManager.solveAndListen(id, (problemId) -> problem, bestSolution -> {
            process.instances().findById(id).ifPresent(pi -> {
                pi.send(Sig.of("newSolution", bestSolution));
            });
        }, finalBestSolution -> {
            process.instances().findById(id).ifPresent(pi -> {
                pi.send(Sig.of("solvingTerminated", finalBestSolution));
            });
        },
                (message, exception) -> {
                    process.instances().findById(id).ifPresent(ProcessInstance::abort);
                });
    }
}