/**
*
* Copyright (c) 2006-2017, Speedment, Inc. All Rights Reserved.
*
* 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 com.speedment.example.basic_example;
import com.company.sakila.SakilaApplication;
import com.company.sakila.db0.sakila.film.Film;
import com.company.sakila.db0.sakila.film.FilmManager;
import static com.speedment.oracle_java_magazine.util.ExampleUtil.buildApplication;
import com.speedment.runtime.core.ApplicationBuilder.LogType;
import java.util.function.UnaryOperator;
import java.util.stream.Stream;
/**
*
* @author Per Minborg
*/
public class RestBackEnd {
private final SakilaApplication app;
private final FilmManager films;
public RestBackEnd() {
app = buildApplication(b -> b.withLogging(LogType.STREAM_OPTIMIZER));
films = app.getOrThrow(FilmManager.class);
}
public static void main(String[] args) {
new RestBackEnd().run();
}
private void run() {
serveFilms("PG-13", 0).forEach(System.out::println);
serveFilms("PG-13", 1).forEach(System.out::println);
serveFilms("PG-13", 3).forEach(System.out::println);
}
private static final int PAGE_SIZE = 50;
private Stream<Film> serveFilms(String rating, int page) {
System.out.format("serveFilms(String rating=%s, int page=%d) %n", rating, page);
Stream<Film> stream = films.stream();
if (rating != null) {
stream = stream.filter(Film.RATING.equal(rating));
}
return stream
.sorted(Film.LENGTH.comparator())
.skip(page * PAGE_SIZE)
.limit(PAGE_SIZE);
}
private Stream<Film> serveFilmsVariant(String rating, int page) {
System.out.format("serveFilmsVariant(String rating=%s, int page=%d) %n", rating, page);
Stream<Film> stream = films.stream()
.sorted(Film.LENGTH.comparator().reversed())
.sorted(Film.RELEASE_YEAR.comparator())
.filter(Film.LENGTH.greaterThan(2));
if (rating != null) {
stream = stream.filter(Film.RATING.equal(rating));
}
return stream
.skip(page * PAGE_SIZE)
.limit(PAGE_SIZE);
}
private Stream<Film> serveFilmsWithfunctionalFold(String rating, int page) {
System.out.format("serveFilmsWithfunctionalFold(String rating=%s, int page=%d) %n", rating, page);
return Stream.<UnaryOperator<Stream<Film>>>of(
(s) -> rating == null ? s : s.filter(Film.RATING.equal(rating)),
s -> s.sorted(Film.LENGTH.comparator()),
s -> s.skip(page * PAGE_SIZE),
s -> s.limit(PAGE_SIZE)
).reduce(
films.stream(),
(s, o) -> o.apply(s),
(a, b) -> a
);
}
}