#215 - Add reactive examples for MongoDB, Apache Cassandra and Redis.
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Mark Paluch
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Oliver Gierke
Oliver Gierke
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20879e7fa3
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redis/reactive/README.md
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redis/reactive/README.md
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# Spring Data Redis 2.0 - Reactive examples
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This project contains samples of reactive data access features with Spring Data (Redis).
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## Prerequisites
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This project contains samples of specific features of Spring Data Redis using reactive infrastructure.
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49
redis/reactive/pom.xml
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redis/reactive/pom.xml
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>spring-data-redis-reactive</artifactId>
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<name>Spring Data Redis - Reactive support</name>
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<parent>
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<groupId>org.springframework.data.examples</groupId>
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<artifactId>spring-data-redis-examples</artifactId>
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<version>1.0.0.BUILD-SNAPSHOT</version>
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<relativePath>../pom.xml</relativePath>
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</parent>
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<properties>
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<spring-data-releasetrain.version>Kay-BUILD-SNAPSHOT</spring-data-releasetrain.version>
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<spring.version>5.0.0.M3</spring.version>
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<reactor.version>3.0.3.RELEASE</reactor.version>
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<lettuce.version>5.0.0.Beta1</lettuce.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.springframework.data</groupId>
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<artifactId>spring-data-redis</artifactId>
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</dependency>
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<dependency>
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<groupId>io.projectreactor</groupId>
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<artifactId>reactor-core</artifactId>
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</dependency>
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<dependency>
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<groupId>biz.paluch.redis</groupId>
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<artifactId>lettuce</artifactId>
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<version>${lettuce.version}</version>
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</dependency>
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<dependency>
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<groupId>${project.groupId}</groupId>
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<artifactId>spring-data-redis-example-utils</artifactId>
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<version>${project.version}</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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</project>
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/*
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* Copyright 2016 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package example.springdata.redis;
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import javax.annotation.PreDestroy;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.context.annotation.Bean;
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import org.springframework.data.redis.connection.RedisConnectionFactory;
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import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;
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/**
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* @author Mark Paluch
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*/
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@SpringBootApplication
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public class RedisTestConfiguration {
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@Autowired RedisConnectionFactory factory;
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@Bean
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public RedisConnectionFactory redisConnectionFactory() {
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return new LettuceConnectionFactory();
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}
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/**
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* Clear database before shut down.
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*/
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public @PreDestroy void flushTestDb() {
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factory.getConnection().flushDb();
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}
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}
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/*
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* Copyright 2016 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package example.springdata.redis.commands;
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import java.nio.ByteBuffer;
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import java.time.Duration;
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import java.util.Collections;
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import java.util.UUID;
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import org.junit.Before;
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import org.junit.ClassRule;
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import org.junit.Test;
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import org.junit.runner.RunWith;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.boot.test.context.SpringBootTest;
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import org.springframework.data.redis.connection.ReactiveListCommands.PopResult;
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import org.springframework.data.redis.connection.ReactiveRedisConnection;
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import org.springframework.data.redis.connection.ReactiveStringCommands.SetCommand;
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import org.springframework.data.redis.connection.RedisConnectionFactory;
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import org.springframework.data.redis.serializer.RedisSerializer;
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import org.springframework.data.redis.serializer.StringRedisSerializer;
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import org.springframework.test.context.junit4.SpringRunner;
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import example.springdata.redis.RedisTestConfiguration;
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import example.springdata.redis.test.util.RequiresRedisServer;
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import reactor.core.publisher.Flux;
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import reactor.core.publisher.Mono;
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/**
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* Show usage of reactive operations on Redis keys using low level API provided by {@link RedisConnectionFactory}.
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*
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* @author Mark Paluch
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*/
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@RunWith(SpringRunner.class)
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@SpringBootTest(classes = RedisTestConfiguration.class)
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public class KeyOperationsTests {
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// we only want to run this tests when redis is up an running
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public static @ClassRule RequiresRedisServer requiresServer = RequiresRedisServer.onLocalhost();
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private static final String PREFIX = KeyOperationsTests.class.getSimpleName();
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private static final String KEY_PATTERN = PREFIX + "*";
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@Autowired RedisConnectionFactory connectionFactory;
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private ReactiveRedisConnection connection;
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private RedisSerializer<String> serializer = new StringRedisSerializer();
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@Before
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public void setUp() {
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this.connection = connectionFactory.getReactiveConnection();
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}
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/**
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* Uses {@code KEYS} command for loading all matching keys. <br />
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* Note that {@code KEYS} is a blocking command that potentially might affect other operations execution time. <br />
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* All keys will be loaded within <strong>one single</strong> operation.
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*/
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@Test
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public void iterateOverKeysMatchingPrefixUsingKeysCommand() {
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generateRandomKeys(50);
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this.connection.keyCommands() //
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.keys(ByteBuffer.wrap(serializer.serialize(KEY_PATTERN))) //
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.flatMap(Flux::fromIterable) //
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.doOnNext(byteBuffer -> System.out.println(toString(byteBuffer))) //
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.count() //
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.doOnSuccess(count -> System.out.println(String.format("Total No. found: %s", count))) //
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.block();
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}
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/**
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* Uses {@code RPUSH} to store an item inside a list and {@code BRPOP} <br />
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*/
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@Test
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public void storeToListAndPop() {
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Mono<PopResult> popResult = this.connection.listCommands()
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.brPop(Collections.singletonList(ByteBuffer.wrap("list".getBytes())), Duration.ofSeconds(5));
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Mono<Long> llen = this.connection.listCommands().lLen(ByteBuffer.wrap("list".getBytes()));
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this.connection.listCommands() //
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.rPush(ByteBuffer.wrap("list".getBytes()), Collections.singletonList(ByteBuffer.wrap("item".getBytes())))
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.flatMap(l -> popResult) //
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.doOnNext(result -> System.out.println(toString(result.getValue()))) //
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.flatMap(result -> llen) //
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.doOnNext(count -> System.out.println(String.format("Total items in list left: %s", count))) //
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.then() //
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.block();
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}
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private void generateRandomKeys(int nrKeys) {
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Flux<String> keyFlux = Flux.range(0, nrKeys).map(i -> (PREFIX + "-" + i));
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Flux<SetCommand> generator = keyFlux.map(String::getBytes).map(ByteBuffer::wrap) //
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.map(key -> SetCommand.set(key) //
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.value(ByteBuffer.wrap(UUID.randomUUID().toString().getBytes())));
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this.connection.stringCommands() //
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.set(generator) //
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.then() //
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.block();
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}
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private static String toString(ByteBuffer byteBuffer) {
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byte[] bytes = new byte[byteBuffer.remaining()];
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byteBuffer.get(bytes);
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return new String(bytes);
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}
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}
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1
redis/reactive/src/test/resources/application.properties
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1
redis/reactive/src/test/resources/application.properties
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logging.level.root=WARN
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