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Rqueue: Redis Queue, Task Queue, Scheduled Queue for Spring and Spring Boot

Rqueue is an asynchronous task executor(worker) built for spring and spring-boot framework based on the spring framework's messaging library backed by Redis. It can be used as message broker as well, where all services code is in Spring.

Features

Instant delivery : Instant execute this message in the background
Message scheduling : A message can be scheduled for any arbitrary period
Unique message : Unique message processing for a queue based on the message id
Periodic message : Process same message at certain interval
Priority tasks : task having some special priority like high, low, medium
Message delivery : It's guaranteed that a message is consumed at least once. (Message would be consumed by a worker more than once due to the failure in the underlying worker/restart-process etc, otherwise exactly one delivery)
Message retry : Message would be retried automatically on application crash/failure/restart etc.
Automatic message serialization and deserialization
Message Multicasting : Call multiple message listeners on every message
Batch Message Polling : Fetch multiple messages from Redis at once
Metrics : In flight messages, waiting for consumption and scheduled messages
Competing Consumers : multiple messages can be consumed in parallel by different workers/listeners.
Concurrency : Concurrency of any listener can be configured
Queue Priority :
- Group level queue priority(weighted and strict)
- Sub queue priority(weighted and strict)
Long execution job : Long running jobs can check in periodically.
Execution Backoff : Exponential and fixed back off (default fixed back off)
Middleware : Add one or more middleware, middlewares are called before listener method.
Callbacks : Callbacks for dead letter queue, discard etc
Events : 1. Bootstrap event 2. Task execution event.
Redis connection : A different redis setup can be used for Rqueue
Redis cluster : Redis cluster can be used with Lettuce client.
Redis Sentinel : Redis sentinel can be used with Rqueue.
Reactive Programming : Supports reactive Redis and spring webflux
Web Dashboard : Web dashboard to manage a queue and queue insights including latency

Requirements

Spring 5+, 6+
Java 1.8+,17
Spring boot 2+,3+
Lettuce client for Redis cluster
Read master preference for Redis cluster

Getting Started

Dependency

Snapshot Version: https://s01.oss.sonatype.org/content/repositories/snapshots/com/github/sonus21/
Release Version: Maven central

Spring Boot

NOTE:

For spring boot 2.x use Rqueue 2.x
For spring boot 3.x use Rqueue 3.x

Get the latest one from Maven central

Add dependency

Gradle

    implementation 'com.github.sonus21:rqueue-spring-boot-starter:2.13.1-RELEASE'

Maven

 <dependency>
    <groupId>com.github.sonus21</groupId>
    <artifactId>rqueue-spring-boot-starter</artifactId>
    <version>2.13.1-RELEASE</version>
</dependency>

No additional configurations are required, only dependency is required.

Spring Framework

NOTE

For spring framework 5.x use rqueue-spring 2.x
For spring framework 6.x use rqueue-spring 3.x

Get the latest one from Maven central

Add Dependency

Gradle

    implementation 'com.github.sonus21:rqueue-spring:2.13.1-RELEASE'

Maven

 <dependency>
   <groupId>com.github.sonus21</groupId>
   <artifactId>rqueue-spring</artifactId>
   <version>2.13.1-RELEASE</version>
 </dependency>

Add annotation EnableRqueue on application config class
Provide a RedisConnectionFactory bean

Configuration

@EnableRqueue
public class Application {
  @Bean
  public RedisConnectionFactory redisConnectionFactory() {
    // return a redis connection factory
  }
}

Message publishing/Task submission

All messages need to be sent using RqueueMessageEnqueuer bean's enqueueXXX, enqueueInXXX and enqueueAtXXX methods. It has handful number of enqueue, enqueueIn, enqueueAt methods, we can use any one of them based on the use case.

public class MessageService {

  @AutoWired
  private RqueueMessageEnqueuer rqueueMessageEnqueuer;

  public void doSomething() {
    rqueueMessageEnqueuer.enqueue("simple-queue", "Rqueue is configured");
  }

  public void createJOB(Job job) {
    rqueueMessageEnqueuer.enqueue("job-queue", job);
  }

  // send notification in 30 seconds
  public void sendNotification(Notification notification) {
    rqueueMessageEnqueuer.enqueueIn("notification-queue", notification, 30 * 1000L);
  }

  // enqueue At example
  public void createInvoice(Invoice invoice, Instant instant) {
    rqueueMessageEnqueuer.enqueueAt("invoice-queue", invoice, instant);
  }

  // enqueue with priority, when sub queues are used as explained in the queue priority section.
  enum SmsPriority {
    CRITICAL("critical"),
    HIGH("high"),
    MEDIUM("medium"),
    LOW("low");
    private String value;
  }

  public void sendSms(Sms sms, SmsPriority priority) {
    rqueueMessageEnqueuer.enqueueWithPriority("sms-queue", priority.value(), sms);
  }

  // Index chat every 1 minute
  public void sendPeriodicEmail(Email email) {
    rqueueMessageEnqueuer.enqueuePeriodic("chat-indexer", chatIndexer, 60_000);
  }

}

Worker/Consumer/Task Executor/Listener

Any method that's part of spring bean, can be marked as worker/message listener using RqueueListener annotation

@Component
@Slf4j
public class MessageListener {

  @RqueueListener(value = "simple-queue")
  public void simpleMessage(String message) {
    log.info("simple-queue: {}", message);
  }

  @RqueueListener(value = "job-queue", numRetries = "3",
      deadLetterQueue = "failed-job-queue", concurrency = "5-10")
  public void onMessage(Job job) {
    log.info("Job alert: {}", job);
  }

  @RqueueListener(value = "push-notification-queue", numRetries = "3",
      deadLetterQueue = "failed-notification-queue")
  public void onMessage(Notification notification) {
    log.info("Push notification: {}", notification);
  }

  @RqueueListener(value = "sms", priority = "critical=10,high=8,medium=4,low=1")
  public void onMessage(Sms sms) {
    log.info("Sms : {}", sms);
  }

  @RqueueListener(value = "chat-indexing", priority = "20", priorityGroup = "chat")
  public void onMessage(ChatIndexing chatIndexing) {
    log.info("ChatIndexing message: {}", chatIndexing);
  }

  @RqueueListener(value = "chat-indexing-daily", priority = "10", priorityGroup = "chat")
  public void onMessage(ChatIndexing chatIndexing) {
    log.info("ChatIndexing message: {}", chatIndexing);
  }

  // checkin job example
  @RqueueListener(value = "chat-indexing-weekly", priority = "5", priorityGroup = "chat")
  public void onMessage(ChatIndexing chatIndexing,
      @Header(RqueueMessageHeaders.JOB) com.github.sonus21.rqueue.core.Job job) {
    log.info("ChatIndexing message: {}", chatIndexing);
    job.checkIn("Chat indexing...");
  }
}

Dashboard

Link: http://localhost:8080/rqueue

Queue Statistics

Micrometer based dashboard for queue

Message Waiting For Execution

Recent jobs details

Status

Rqueue is stable and production ready, it's processing 100K+ messages daily in production environment. Some of the Rqueue Users

We would love to add your organization name here, if you're one of the Rqueue users, please raise a PR/issue .

Support

Please report bug,question,feature(s) to issue tracker.
Ask question on StackOverflow using #rqueue tag

Contribution

You are most welcome for any pull requests for any feature/bug/enhancement. You would need Java8 and gradle to start with. In root build.gradle file comment out spring related versions, or set environment variables for Spring versions. You can use module, class and other diagrams to familiarise yourself with the project.

Please format your code with Google Java formatter.