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Cara menggunakan Lettuce dalam Redis

WBOYke hadapan: 2023-05-28 21:51:241702semak imbas

1. Ringkasan

Lettuce ialah klien Java lanjutan untuk Redis Ia telah menjadi salah satu pelanggan yang paling popular bersama Jedis kini telah menjadi klien redis lalai dalam versi SpringBoot 2.0.

Berbanding dengan Jedis veteran, Lettuce adalah bintang yang semakin meningkat, Ia bukan sahaja kaya dengan fungsi, tetapi juga menyediakan banyak ciri baharu, seperti operasi tak segerak, pengaturcaraan reaktif, dll., dan juga menyelesaikan masalah ketidakamanan. masalah di Jedis.

2. Lettuce

2.1. Penggunaan asas

Mula-mula, buat projek maven, perkenalkan pakej lettuce-core dan anda boleh menggunakannya.

<dependency>
  <groupId>io.lettuce</groupId>
  <artifactId>lettuce-core</artifactId>
  <version>5.3.1.RELEASE</version>
</dependency>

Gunakan salad untuk menyambung ke redis dan menguji sama ada sambungan boleh menjadi normal!

public class LettuceMain {

    public static void main(String[] args) {
        RedisURI redisUri = RedisURI.builder()
                .withHost("127.0.0.1")
                .withPort(6379)
                .withPassword("111111")
                .withTimeout(Duration.of(10, ChronoUnit.SECONDS))
                .build();
        RedisClient redisClient = RedisClient.create(redisUri);
        StatefulRedisConnection<String, String> connection = redisClient.connect();
        RedisCommands<String, String> commands = connection.sync();
        System.out.println(commands.ping());
        connection.close();
        redisClient.shutdown();
    }
}

2.2. Operasi segerak

Pada asasnya, Lettuce menyokong semua operasi arahan segerak yang disokong oleh Jedis.

Di bawah, kami mengambil operasi segerak rentetan sebagai contoh operasi api Lettuce adalah seperti berikut!

public class LettuceSyncMain {

    public static void main(String[] args) {
        RedisURI redisUri = RedisURI.builder()
                .withHost("127.0.0.1").withPort(6379).withPassword("111111")
                .withTimeout(Duration.of(10, ChronoUnit.SECONDS))
                .build();
        RedisClient redisClient = RedisClient.create(redisUri);
        StatefulRedisConnection<String, String> connection = redisClient.connect();
        //获取同步操作命令工具
        RedisCommands<String, String> commands = connection.sync();

        System.out.println("清空数据："+commands.flushdb());
        System.out.println("判断某个键是否存在："+commands.exists("username"));
        System.out.println("新增<&#39;username&#39;,&#39;xmr&#39;>的键值对："+commands.set("username", "xmr"));
        System.out.println("新增<&#39;password&#39;,&#39;password&#39;>的键值对："+commands.set("password", "123"));
        System.out.println("获取<&#39;password&#39;>键的值："+commands.get("password"));
        System.out.println("系统中所有的键如下：" + commands.keys("*"));
        System.out.println("删除键password:"+commands.del("password"));
        System.out.println("判断键password是否存在："+commands.exists("password"));
        System.out.println("设置键username的过期时间为5s:"+commands.expire("username", 5L));
        System.out.println("查看键username的剩余生存时间："+commands.ttl("username"));
        System.out.println("移除键username的生存时间："+commands.persist("username"));
        System.out.println("查看键username的剩余生存时间："+commands.ttl("username"));
        System.out.println("查看键username所存储的值的类型："+commands.type("username"));

        connection.close();
        redisClient.shutdown();
    }
}

2.3. Operasi tak segerak

Selain itu, Lettuce juga menyokong operasi tak segerak kepada pemprosesan tak segerak.

public class LettuceASyncMain {

    public static void main(String[] args) throws Exception {
        RedisURI redisUri = RedisURI.builder()
                .withHost("127.0.0.1").withPort(6379).withPassword("111111")
                .withTimeout(Duration.of(10, ChronoUnit.SECONDS))
                .build();
        RedisClient redisClient = RedisClient.create(redisUri);
        StatefulRedisConnection<String, String> connection = redisClient.connect();
        //获取异步操作命令工具
        RedisAsyncCommands<String, String> commands = connection.async();

        System.out.println("清空数据："+commands.flushdb().get());
        System.out.println("判断某个键是否存在："+commands.exists("username").get());
        System.out.println("新增<&#39;username&#39;,&#39;xmr&#39;>的键值对："+commands.set("username", "xmr").get());
        System.out.println("新增<&#39;password&#39;,&#39;password&#39;>的键值对："+commands.set("password", "123").get());
        System.out.println("获取<&#39;password&#39;>键的值："+commands.get("password").get());
        System.out.println("系统中所有的键如下：" + commands.keys("*").get());
        System.out.println("删除键password:"+commands.del("password").get());
        System.out.println("判断键password是否存在："+commands.exists("password").get());
        System.out.println("设置键username的过期时间为5s:"+commands.expire("username", 5L).get());
        System.out.println("查看键username的剩余生存时间："+commands.ttl("username").get());
        System.out.println("移除键username的生存时间："+commands.persist("username").get());
        System.out.println("查看键username的剩余生存时间："+commands.ttl("username").get());
        System.out.println("查看键username所存储的值的类型："+commands.type("username").get());

        connection.close();
        redisClient.shutdown();
    }
}

2.4. Pengaturcaraan reaktif

Selain menyokong pengaturcaraan tak segerak, Lettuce juga menyokong pengaturcaraan reaktif yang diperkenalkan oleh Lettuce ialah Project Reactor. anda boleh Cari sendiri dahulu.

Kes penggunaan pengaturcaraan reaktif adalah seperti berikut:

public class LettuceMain {

    public static void main(String[] args) throws Exception {
        RedisURI redisUri = RedisURI.builder()
                .withHost("127.0.0.1").withPort(6379).withPassword("111111")
                .withTimeout(Duration.of(10, ChronoUnit.SECONDS))
                .build();
        RedisClient redisClient = RedisClient.create(redisUri);
        StatefulRedisConnection<String, String> connection = redisClient.connect();
        //获取响应式API操作命令工具
        RedisReactiveCommands<String, String> commands = connection.reactive();

        Mono<String> setc = commands.set("name", "mayun");
        System.out.println(setc.block());
        Mono<String> getc = commands.get("name");
        getc.subscribe(System.out::println);
        Flux<String> keys = commands.keys("*");
        keys.subscribe(System.out::println);

        //开启一个事务，先把count设置为1，再将count自增1
        commands.multi().doOnSuccess(r -> {
            commands.set("count", "1").doOnNext(value -> System.out.println("count1：" +  value)).subscribe();
            commands.incr("count").doOnNext(value -> System.out.println("count2：" +  value)).subscribe();
        }).flatMap(s -> commands.exec())
                .doOnNext(transactionResult -> System.out.println("transactionResult：" + transactionResult.wasDiscarded())).subscribe();

        Thread.sleep(1000 * 5);
        connection.close();
        redisClient.shutdown();
    }
}

2.5, penerbitan dan langganan

Lettuce juga menyokong penerbitan mesej redis dan langganan Kes pelaksanaan khusus adalah seperti berikut:

public class LettuceReactiveMain1 {

    public static void main(String[] args) throws Exception {
        RedisURI redisUri = RedisURI.builder()
                .withHost("127.0.0.1").withPort(6379).withPassword("111111")
                .withTimeout(Duration.of(10, ChronoUnit.SECONDS))
                .build();
        RedisClient redisClient = RedisClient.create(redisUri);
        //获取发布订阅操作命令工具
        StatefulRedisPubSubConnection<String, String> pubsubConn = redisClient.connectPubSub();
        pubsubConn.addListener(new RedisPubSubListener<String, String>() {
            @Override
            public void unsubscribed(String channel, long count) {
                System.out.println("[unsubscribed]" + channel);
            }
            @Override
            public void subscribed(String channel, long count) {
                System.out.println("[subscribed]" + channel);
            }
            @Override
            public void punsubscribed(String pattern, long count) {
                System.out.println("[punsubscribed]" + pattern);
            }
            @Override
            public void psubscribed(String pattern, long count) {
                System.out.println("[psubscribed]" + pattern);
            }
            @Override
            public void message(String pattern, String channel, String message) {
                System.out.println("[message]" + pattern + " -> " + channel + " -> " + message);
            }
            @Override
            public void message(String channel, String message) {
                System.out.println("[message]" + channel + " -> " + message);
            }
        });
        RedisPubSubAsyncCommands<String, String> pubsubCmd = pubsubConn.async();
        pubsubCmd.psubscribe("CH");
        pubsubCmd.psubscribe("CH2");
        pubsubCmd.unsubscribe("CH");

        Thread.sleep(100 * 5);
        pubsubConn.close();
        redisClient.shutdown();
    }
}

2.6. Sumber pelanggan dan konfigurasi parameter

Rangka kerja komunikasi klien Lettuce menyepadukan operasi IO tanpa sekatan Netty Lettuce. Jika tidak, saya sangat biasa dengan konfigurasi parameter klien Tidak disyorkan untuk mengubah suai nilai lalai tanpa pengalaman.

Dalam persekitaran bukan kelompok, kes konfigurasi khusus adalah seperti berikut:

public class LettuceMain {

    public static void main(String[] args) throws Exception {
        ClientResources resources = DefaultClientResources.builder()
                .ioThreadPoolSize(4) //I/O线程数
                .computationThreadPoolSize(4) //任务线程数
                .build();
        RedisURI redisUri = RedisURI.builder()
                .withHost("127.0.0.1").withPort(6379).withPassword("111111")
                .withTimeout(Duration.of(10, ChronoUnit.SECONDS))
                .build();
        ClientOptions options = ClientOptions.builder()
                .autoReconnect(true)//是否自动重连
                .pingBeforeActivateConnection(true)//连接激活之前是否执行PING命令
                .build();
        RedisClient client = RedisClient.create(resources, redisUri);
        client.setOptions(options);
        StatefulRedisConnection<String, String> connection = client.connect();
        RedisCommands<String, String> commands = connection.sync();
        commands.set("name", "关羽");
        System.out.println(commands.get("name"));

        connection.close();
        client.shutdown();
        resources.shutdown();
    }
}

Dalam persekitaran kelompok, kes konfigurasi khusus adalah seperti berikut:

public class LettuceMain {

    public static void main(String[] args) throws Exception {
        ClientResources resources = DefaultClientResources.builder()
                .ioThreadPoolSize(4) //I/O线程数
                .computationThreadPoolSize(4) //任务线程数
                .build();
        RedisURI redisUri = RedisURI.builder()
                .withHost("127.0.0.1").withPort(6379).withPassword("111111")
                .withTimeout(Duration.of(10, ChronoUnit.SECONDS))
                .build();
        ClusterClientOptions options = ClusterClientOptions.builder()
                .autoReconnect(true)//是否自动重连
                .pingBeforeActivateConnection(true)//连接激活之前是否执行PING命令
                .validateClusterNodeMembership(true)//是否校验集群节点的成员关系
                .build();
        RedisClusterClient client = RedisClusterClient.create(resources, redisUri);
        client.setOptions(options);
        StatefulRedisClusterConnection<String, String> connection = client.connect();
        RedisAdvancedClusterCommands<String, String> commands = connection.sync();
        commands.set("name", "张飞");
        System.out.println(commands.get("name"));

        connection.close();
        client.shutdown();
        resources.shutdown();
    }
}

2.7, Konfigurasi kumpulan benang

Sambungan Lettuce direka untuk selamat untuk benang, jadi sambungan boleh dikongsi oleh berbilang benang Pada masa yang sama, sambungan Lettuce disambung semula secara lalai memenuhi keperluan perniagaan Dalam kebanyakan kes, tidak perlu mengkonfigurasi sambungan dan berbilang sambungan tidak akan membawa peningkatan prestasi kepada operasi.

Tetapi dalam beberapa senario khas, seperti operasi transaksi, menggunakan kumpulan sambungan akan menjadi penyelesaian yang lebih baik.

public class LettuceMain {

    public static void main(String[] args) throws Exception {
        RedisURI redisUri = RedisURI.builder()
                .withHost("127.0.0.1")
                .withPort(6379)
                .withPassword("111111")
                .withTimeout(Duration.of(10, ChronoUnit.SECONDS))
                .build();
        RedisClient client = RedisClient.create(redisUri);
        //连接池配置
        GenericObjectPoolConfig poolConfig = new GenericObjectPoolConfig();
        poolConfig.setMaxIdle(2);

        GenericObjectPool<StatefulRedisConnection<String, String>> pool = ConnectionPoolSupport.createGenericObjectPool(client::connect, poolConfig);
        StatefulRedisConnection<String, String> connection = pool.borrowObject();
        RedisCommands<String, String> commands = connection.sync();
        commands.set("name", "张飞");
        System.out.println(commands.get("name"));

        connection.close();
        pool.close();
        client.shutdown();
    }
}

2.8. Konfigurasi mod Master-slave

Redis secara amnya menggunakan mod replikasi master-slave untuk membina seni bina ketersediaan tinggi, secara ringkasnya, ia mempunyai satu nod induk, berbilang nod hamba. dan secara automatik hamba daripada nod induk Segerakkan data terkini.

Lettuce menyokong penemuan maklumat nod secara automatik dalam mod master-slave dan kemudian menyimpannya secara setempat Konfigurasi khusus adalah seperti berikut:

public class LettuceMain {

    public static void main(String[] args) throws Exception {
        //这里只需要配置一个节点的连接信息，不一定需要是主节点的信息，从节点也可以;可以自动发现主从节点
        RedisURI uri = RedisURI.builder().withHost("192.168.31.111").withPort(6379).withPassword("123456").build();
        RedisClient client = RedisClient.create(uri);
        StatefulRedisMasterReplicaConnection<String, String> connection = MasterReplica.connect(client, StringCodec.UTF8, uri);
        //从节点读取数据
        connection.setReadFrom(ReadFrom.REPLICA);

        RedisCommands<String, String> commands = connection.sync();
        commands.set("name", "张飞");
        System.out.println(commands.get("name"));

        connection.close();
        client.shutdown();
    }
}

Sudah tentu, kami juga boleh menentukan nod kluster untuk dimuatkan secara manual. . Konfigurasi khusus adalah seperti berikut:

public class LettuceMain {

    public static void main(String[] args) throws Exception {
        //集群节点
        List<RedisURI> uris = new ArrayList();
        uris.add(RedisURI.builder().withHost("192.168.31.111").withPort(6379).withPassword("111111").build());
        uris.add(RedisURI.builder().withHost("192.168.31.112").withPort(6379).withPassword("111111").build());
        uris.add(RedisURI.builder().withHost("192.168.31.113").withPort(6379).withPassword("111111").build());

        RedisClient client = RedisClient.create();
        StatefulRedisMasterReplicaConnection<String, String> connection = MasterReplica.connect(client, StringCodec.UTF8, uris);
        //从节点读取数据
        connection.setReadFrom(ReadFrom.REPLICA);

        RedisCommands<String, String> commands = connection.sync();
        commands.set("name", "张飞");
        System.out.println(commands.get("name"));

        connection.close();
        client.shutdown();
    }
}

2.9, Konfigurasi mod Sentinel

Mod Sentinel juga merupakan sorotan redis untuk mencapai ketersediaan perkhidmatan yang tinggi adalah seperti berikut:

public class LettuceMain {

    public static void main(String[] args) throws Exception {
        //集群节点
        List<RedisURI> uris = new ArrayList();
        uris.add(RedisURI.builder().withSentinel("192.168.31.111", 26379).withSentinelMasterId("mymaster").withPassword("123456").build());
        uris.add(RedisURI.builder().withSentinel("192.168.31.112", 26379).withSentinelMasterId("mymaster").withPassword("123456").build());
        uris.add(RedisURI.builder().withSentinel("192.168.31.113", 26379).withSentinelMasterId("mymaster").withPassword("123456").build());

        RedisClient client = RedisClient.create();
        StatefulRedisMasterReplicaConnection<String, String> connection = MasterReplica.connect(client, StringCodec.UTF8, uris);
        //从节点读取数据
        connection.setReadFrom(ReadFrom.REPLICA);

        RedisCommands<String, String> commands = connection.sync();
        commands.set("name", "赵云");
        System.out.println(commands.get("name"));

        connection.close();
        client.shutdown();
    }
}

2.10, Konfigurasi mod kluster

Mod kluster ialah model seni bina ketersediaan tinggi yang diperkenalkan kemudiannya

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