example.springdata.cassandra.people.ReactiveCassandraTemplateIntegrationTest.java Source code

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Here is the source code for example.springdata.cassandra.people.ReactiveCassandraTemplateIntegrationTest.java

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/*
 * Copyright 2016-2017 the original author or authors.
 *
 * 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 example.springdata.cassandra.people;

import static com.datastax.driver.core.querybuilder.QueryBuilder.*;
import static org.assertj.core.api.Assertions.*;

import example.springdata.cassandra.util.CassandraKeyspace;
import reactor.core.publisher.Flux;
import rx.RxReactiveStreams;

import java.util.concurrent.CountDownLatch;

import org.junit.Before;
import org.junit.ClassRule;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.cassandra.core.ReactiveCassandraTemplate;
import org.springframework.test.context.junit4.SpringRunner;

/**
 * Integration test for {@link ReactiveCassandraTemplate}.
 *
 * @author Mark Paluch
 */
@RunWith(SpringRunner.class)
@SpringBootTest
public class ReactiveCassandraTemplateIntegrationTest {

    @ClassRule
    public final static CassandraKeyspace CASSANDRA_KEYSPACE = CassandraKeyspace.onLocalhost();

    @Autowired
    ReactiveCassandraTemplate template;

    /**
     * Truncate table and insert some rows.
     */
    @Before
    public void setUp() {

        template.truncate(Person.class) //
                .thenMany(Flux.just(new Person("Walter", "White", 50), //
                        new Person("Skyler", "White", 45), //
                        new Person("Saul", "Goodman", 42), //
                        new Person("Jesse", "Pinkman", 27))) //
                .flatMap(template::insert) //
                .then() //
                .block();
    }

    /**
     * This sample performs a count, inserts data and performs a count again using reactive operator chaining. It prints
     * the two counts ({@code 4} and {@code 6}) to the console.
     */
    @Test
    public void shouldInsertAndCountData() throws Exception {

        CountDownLatch countDownLatch = new CountDownLatch(1);

        template.count(Person.class) //
                .doOnNext(System.out::println) //
                .thenMany(Flux.just(new Person("Hank", "Schrader", 43), //
                        new Person("Mike", "Ehrmantraut", 62)))
                .flatMap(template::insert) //
                .last() //
                .flatMap(v -> template.count(Person.class)) //
                .doOnNext(System.out::println) //
                .doOnTerminate(countDownLatch::countDown) //
                .subscribe();

        countDownLatch.await();
    }

    /**
     * Note that the all object conversions are performed before the results are printed to the console.
     */
    @Test
    public void convertReactorTypesToRxJava1() throws Exception {

        Flux<Person> flux = template.select(select().from("person").where(eq("lastname", "White")), Person.class);

        long count = RxReactiveStreams.toObservable(flux) //
                .count() //
                .toSingle() //
                .toBlocking() //
                .value(); //

        assertThat(count).isEqualTo(2);
    }
}