[ANN] dropwizard-sundial - scheduled jobs (interval and cron) for dropwizard

[Tim Molter]

I've recently released a project called dropwizard-sundial, which nicely integrates Sundial into a Dropwizard app, adding many new convenient features. With [dropwizard-sundial](https://github.com/timmolter/dropwizard-sundial), you can easily integrate the lightweight multi-threaded Java job scheduling library, [Sundial](https://github.com/timmolter/Sundial), and add Jobs either using a `SimpleTrigger` or a `CronTrigger`. First, you'd start out with a class defining your job logic with a `SimpleTrigger` annotation: 

    @SimpleTrigger(repeatInterval = 60, timeUnit = TimeUnit.SECONDS)    
    public class SampleJob extends com.xeiam.sundial.Job {
        
      @Override
      public void doRun() throws JobInterruptException {
        // Do something interesting...
      }
    }



A `CronTrigger` annotation is also available (@CronTrigger(cron = "0/5 * * * * ?")). In your Dropwizard app's `yaml` file, you'll need to define what package `dropwizard-sundial` should search for annotated job classes. Following is an example config with the `annotated-jobs-package-name` config param along with several other optional params for fine-tuning the scheduler:

    sundial:
      thread-pool-size: 10
      shutdown-on-unload: true
      wait-on-shutdown: false
      start-delay-seconds: 0
      start-scheduler-on-load: true
      global-lock-on-load: false
      annotated-jobs-package-name: com.foo.bar.jobs

Additionally, you can control the scheduler asynchronously via Curl while the app is running to do things like locking and unlocking the scheduler, starting, stopping, adding, removing jobs and triggers. Here are a few examples:

    curl -X POST http://localhost:9090/admin/tasks/locksundialscheduler
    curl -X POST http://localhost:9090/admin/tasks/unlocksundialscheduler
    curl -X POST "http://localhost:9090/admin/tasks/startjob?JOB_NAME=MyJob"

Instructions for integration as well as more features can be found in the project's README. Enjoy!

[Carlo Barbara]

Thanks for sharing!

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[André Ricardo]

In dropwizard-sundial is there a way to access the PrintWriter output as I do in a Dropwizard Task?

@Override
public void execute(ImmutableMultimap<String, String> parameters, PrintWriter output) throws Exception {
    output.println("task executing");
}

dropwizard-sundial

@Override
public void doRun() throws JobInterruptException {

    output.println("pinnnng job is executing"); // How do I do this?
}

Thanks!

[André Ricardo]

I have managed to do what I wanted by using the Logger and passing DAO objects via ServletContext but I am not sure this is the correct aproach, anyone care to comment?

@SimpleTrigger(repeatInterval = 5, timeUnit = TimeUnit.SECONDS)
public class WordOfTheDayJob extends Job {

    private final Logger logger = LoggerFactory.getLogger(WordOfTheDayJob.class);

    @Override
    public void doRun() throws JobInterruptException {

        logger.info("pinnnng");

        DictionaryDAO daoDA = (DictionaryDAO) SundialJobScheduler.getServletContext().getAttribute("daoDA");

        WordResource wordResource = new WordResource(daoDA);
        Word word = wordResource.wordOfTheDay();
        logger.info("Word of the day: " + word.getNormalized());
    }
}

On Wednesday, March 4, 2015 at 2:04:30 PM UTC, Tim Molter wrote:

[Tim Molter]

Yes, that's the correct approach. Read more about that here: https://github.com/timmolter/dropwizard-sundial#inject-global-objects-or-config-parameters-into-a-job