/*
 * Java Genetic Algorithm Library (@__identifier__@).
 * Copyright (c) @__year__@ Franz Wilhelmstötter
 *
 * 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.
 *
 * Author:
 *    Franz Wilhelmstötter (franz.wilhelmstoetter@gmail.com)
 */
package io.jenetics.ext;

import java.util.function.Predicate;

import io.jenetics.Gene;
import io.jenetics.engine.Engine;
import io.jenetics.engine.EvolutionResult;
import io.jenetics.engine.EvolutionStream;

/**
 * @author <a href="mailto:franz.wilhelmstoetter@gmail.com">Franz Wilhelmstötter</a>
 * @version !__version__!
 * @since !__version__!
 */
public interface EnginePool<
	G extends Gene<?, G>,
	C extends Comparable<? super C>
> {

	public EnginePool<G, C> append(
		final Engine<G, C> engine,
		final Predicate<? super EvolutionResult<G, C>> proceed
	);

	public default EnginePool<G, C> append(final Engine<G, C> engine) {
		return append(engine, result -> true);
	}

	public EvolutionStream<G, C> stream();

	public static <G extends Gene<?, G>, C extends Comparable<? super C>>
	EnginePool<G, C> concat() {
		return null;
	}

}

Add 'EnginePool' interface.