embedded-redis

Redis embedded server for Java integration testing.

Forked from ozimov which again was forked from kstyrc.
Forked because both ozimov and kstyrc repositories doesn't appear to be maintained anymore.

The primary goal of this fork is to keep the library up to date with all the latest versions/dependencies.

Maven dependency

Maven Central:

<dependency>
  <groupId>io.github.jesperberggren</groupId>
  <artifactId>embedded-redis</artifactId>
  <version>0.1.0</version>
</dependency>

Usage

Running RedisServer is as simple as:

RedisServer redisServer = new RedisServer(6379);
redisServer.start();
// do some work
redisServer.stop();

You can also provide RedisServer with your own executable:

// 1) given explicit file (os-independence broken!)
RedisServer redisServer = new RedisServer("/path/to/your/redis", 6379);

// 2) given os-independent matrix
RedisExecProvider customProvider = RedisExecProvider.defaultProvider()
  .override(OS.UNIX, "/path/to/unix/redis")
  .override(OS.WINDOWS, Architecture.x86, "/path/to/windows/redis")
  .override(OS.Windows, Architecture.x86_64, "/path/to/windows/redis")
  .override(OS.MAC_OS_X, Architecture.x86, "/path/to/macosx/redis")
  .override(OS.MAC_OS_X, Architecture.x86_64, "/path/to/macosx/redis")
  
RedisServer redisServer = new RedisServer(customProvider, 6379);

You can also use fluent API to create RedisServer:

RedisServer redisServer = RedisServer.builder()
  .redisExecProvider(customRedisProvider)
  .port(6379)
  .slaveOf("locahost", 6378)
  .configFile("/path/to/your/redis.conf")
  .build();

Or even create simple redis.conf file from scratch:

RedisServer redisServer = RedisServer.builder()
  .redisExecProvider(customRedisProvider)
  .port(6379)
  .setting("bind 127.0.0.1") // good for local development on Windows to prevent security popups
  .slaveOf("locahost", 6378)
  .setting("daemonize no")
  .setting("appendonly no")
  .setting("maxmemory 128M")
  .build();

Setting up a cluster

Our Embedded Redis has support for HA Redis clusters with Sentinels and master-slave replication

Using ephemeral ports

A simple redis integration test with Redis cluster on ephemeral ports, with setup similar to that from production would look like this:

public class SomeIntegrationTestThatRequiresRedis {
  private RedisCluster cluster;
  private Set<String> jedisSentinelHosts;

  @Before
  public void setup() throws Exception {
    //creates a cluster with 3 sentinels, quorum size of 2 and 3 replication groups, each with one master and one slave
    cluster = RedisCluster.builder().ephemeral().sentinelCount(3).quorumSize(2)
                    .replicationGroup("master1", 1)
                    .replicationGroup("master2", 1)
                    .replicationGroup("master3", 1)
                    .build();
    cluster.start();

    //retrieve ports on which sentinels have been started, using a simple Jedis utility class
    jedisSentinelHosts = JedisUtil.sentinelHosts(cluster);
  }
  
  @Test
  public void test() throws Exception {
    // testing code that requires redis running
    JedisSentinelPool pool = new JedisSentinelPool("master1", jedisSentinelHosts);
  }
  
  @After
  public void tearDown() throws Exception {
    cluster.stop();
  }
}

Retrieving ports

The above example starts Redis cluster on ephemeral ports, which you can later get with cluster.ports(), which will return a list of all ports of the cluster. You can also get ports of sentinels with cluster.sentinelPorts() or servers with cluster.serverPorts(). JedisUtil class contains utility methods for use with Jedis client.

Using predefined ports

You can also start Redis cluster on predefined ports and even mix both approaches:

public class SomeIntegrationTestThatRequiresRedis {
  private RedisCluster cluster;

  @Before
  public void setup() throws Exception {
    final List<Integer> sentinels = Arrays.asList(26739, 26912);
    final List<Integer> group1 = Arrays.asList(6667, 6668);
    final List<Integer> group2 = Arrays.asList(6387, 6379);
    //creates a cluster with 3 sentinels, quorum size of 2 and 3 replication groups, each with one master and one slave
    cluster = RedisCluster.builder().sentinelPorts(sentinels).quorumSize(2)
                    .serverPorts(group1).replicationGroup("master1", 1)
                    .serverPorts(group2).replicationGroup("master2", 1)
                    .ephemeralServers().replicationGroup("master3", 1)
                    .build();
    cluster.start();
  }
//(...)

The above will create and start a cluster with sentinels on ports 26739, 26912, first replication group on 6667, 6668, second replication group on 6387, 6379 and third replication group on ephemeral ports.

Redis binaries

Redis binaries are included in the library by default, but they are very old. You should probably provide your own binaries to match a more recent version of Redis.

If no RedisExecProvider is given the code will attempt to discover which OS and Architecture is being used and choose an appropriate binary.

Not all operating systems and architectures are supported.

Redis version

When not provided with the desired redis executable, RedisServer runs os-dependent executable enclosed in jar. Currently is uses:

• Redis 2.8.19 in case of Linux/Unix
• Redis 2.8.19 in case of OSX
• Redis 2.8.19 in case of Windows: https://github.com/MSOpenTech/redis/releases/tag/win-2.8.19

However, you should provide RedisServer with redis executable if you need specific version.

License

Licensed under the Apache License, Version 2.0

Contributors

• Krzysztof Styrc (@kstyrc)
• Piotr Turek (@turu)
• anthonyu (@anthonyu)
• Artem Orobets (@enisher)
• Sean Simonsen (@SeanSimonsen)
• Rob Winch (@rwinch)