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grailsgroovy

Error on async job

I'm trying to create an async task that will not block the request. The user make the request, the task will start, and the controller will render "Job is running...", this is for avoid the request being blocked waiting the task to complete. Once the task is finish, it will execute the onComplete and do something with the result of that task (for example call a service that will send a mail to an user)

| Error 2014-09-16 17:38:56,721 [Actor Thread 3] ERROR gpars.LoggingPoolFactory  - Async execution error: null

The code is the following:

package testasync

import static grails.async.Promises.*

class TestController {

  def index() {
    //Create the job
    def job1 = task {
        println 'Waiting 10 seconds'
        Thread.sleep(10000)
        return 'Im done'
    }
    //On error
    job1.onError { Throwable err ->
        println "An error occured ${err.message}"
    }
    //On success
    job1.onComplete { result ->
        println "Promise returned $result"
    }
    render 'Job is running...'
  }

Complete stacktrace:

| Error 2014-09-17 10:35:24,522 [Actor Thread 3] ERROR gpars.LoggingPoolFactory  -  Async execution error: null
Message: null
   Line | Method
 ->>   72 | doCall    in org.grails.async.factory.gpars.GparsPromise$_onError_closure2
  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
  |     62 | run       in groovyx.gpars.dataflow.DataCallback$1
  |   1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
  |    615 | run       in java.util.concurrent.ThreadPoolExecutor$Worker
  ^    745 | run . . . in java.lang.Thread
Solution

  • I ended using the executor framework with the grails-executor plugin. I uploaded a very basic example here: https://github.com/agusl88/grails-async-job-queuqe

    That code is using a "custom" version of the grails-executor plugin, i merged some PR's from the plugin repo and packaged as jar just for testing propuses. The repo of the plugin is this: https://github.com/basejump/grails-executor