README.md

The ultimate library to perform background processing on the JVM.
Dead simple API. Extensible. Reliable.
Distributed and backed by persistent storage.
Open and free for commercial use.
Recommended and loved by ThoughtWorks.

     
   

 

Overview

BackgroundJob.enqueue(() -> System.out.println("This is all you need for distributed jobs!"));

Incredibly easy way to perform fire-and-forget, delayed, scheduled and recurring jobs inside Java applications using only Java 8 lambda's. CPU and I/O intensive, long-running and short-running jobs are supported. Persistent storage is done via either RDBMS (e.g. Postgres, MariaDB/MySQL, Oracle, SQL Server, DB2 and SQLite) or NoSQL (ElasticSearch, MongoDB and Redis).

JobRunr provides a unified programming model to handle background tasks in a reliable way and runs them on shared hosting, dedicated hosting or in the cloud (hello Kubernetes) within a JVM instance.

Feedback

Thanks for building JobRunr, I like it a lot! Before that I used similar libraries in Ruby and Golang and JobRunr so far is the most pleasant one to use. I especially like the dashboard, it’s awesome! Alex Denisov

View more feedback on jobrunr.io.

Features

• Simple: just use Java 8 lambda's to create a background job.
• Distributed & cluster-friendly: guarantees execution by single scheduler instance using optimistic locking.
• Persistent jobs: using either a RDBMS (four tables and a view) or a NoSQL data store.
• Embeddable: built to be embedded in existing applications.
• Minimal dependencies: (ASM, slf4j and either jackson and jackson-datatype-jsr310, gson or a JSON-B compliant library).

Usage scenarios

Some scenarios where it may be a good fit:

• within a REST api return response to client immediately and perform long-running job in the background
• mass notifications/newsletters
• calculations of wages and the creation of the resulting documents
• batch import from xml, csv or json
• creation of archives
• firing off web hooks
• image/video processing
• purging temporary files
• recurring automated reports
• database maintenance
• updating elasticsearch/solr after data changes
• …and so on

You can start small and process jobs within your web app or scale horizontally and add as many background job servers as you want to handle a peak of jobs. JobRunr will distribute the load over all the servers for you. JobRunr is also fault-tolerant - is an external web service down? No worries, the job is automatically retried 10-times with a smart back-off policy.

JobRunr is a Java alternative to HangFire, Resque, Sidekiq, delayed_job, Celery and is similar to Quartz and Spring Task Scheduler.

Screenshots

   
   
   

Usage

Fire-and-forget tasks

Dedicated worker pool threads execute queued background jobs as soon as possible, shortening your request's processing time.

BackgroundJob.enqueue(() -> System.out.println("Simple!"));

Delayed tasks

Scheduled background jobs are executed only after a given amount of time.

BackgroundJob.schedule(Instant.now().plusHours(5), () -> System.out.println("Reliable!"));

Recurring tasks

Recurring jobs have never been simpler; just call the following method to perform any kind of recurring task using the CRON expressions.

BackgroundJob.scheduleRecurrently("my-recurring-job", Cron.daily(), () -> service.doWork());

Process background tasks inside a web application…

You can process background tasks in any web application and we have thorough support for Spring - JobRunr is reliable to process your background jobs within a web application.

… or anywhere else

Like a Spring Console Application, wrapped in a docker container, that keeps running forever and polls for new background jobs.

See https://www.jobrunr.io for more info.

Installation

Using Maven?

JobRunr is available in Maven Central - all you need to do is add the following dependency:

<dependency>
   <groupId>org.jobrunr</groupId>
   <artifactId>jobrunr</artifactId>
   <version>${jobrunr.version}</version>
</dependency>

Using Gradle?

Just add the dependency to JobRunr:

implementation 'org.jobrunr:jobrunr:${jobrunr.version}'

Configuration

Do you like to work Spring based?

Add the jobrunr-spring-boot-3-starter to your dependencies and you're almost ready to go! Just set up your application.properties:

# the job-scheduler is enabled by default
# the background-job-server and dashboard are disabled by default
org.jobrunr.job-scheduler.enabled=true
org.jobrunr.background-job-server.enabled=true
org.jobrunr.dashboard.enabled=true

Or do you prefer a fluent API?

Define a javax.sql.DataSource and put the following code on startup:

@SpringBootApplication
public class JobRunrApplication {

    public static void main(String[] args) {
        SpringApplication.run(JobRunrApplication.class, args);
    }

    @Bean
    public JobScheduler initJobRunr(DataSource dataSource, JobActivator jobActivator) {
        return JobRunr.configure()
                .useJobActivator(jobActivator)
                .useStorageProvider(SqlStorageProviderFactory
                          .using(dataSource))
                .useBackgroundJobServer()
                .useDashboard()
                .initialize().getJobScheduler();
    }
}

Contributing

See CONTRIBUTING for details on submitting patches and the contribution workflow.

How can I contribute?

• Take a look at issues with tag called Good first issue
• Join the discussion on Github discussion - we won't be using Gitter anymore.
• Answer questions on issues.
• Fix bugs reported on issues, and send us pull request.

How to build?

• git clone https://github.com/jobrunr/jobrunr.git
• cd jobrunr
• cd core/src/main/resources/org/jobrunr/dashboard/frontend
• npm i
• npm run build
• cd -
• ./gradlew publishToMavenLocal

Then, in your own project you can depend on org.jobrunr:jobrunr:1.0.0-SNAPSHOT.