[jboss-user] [EJB3] - Job manager/dispatcher pattern

Bernard Labno [https://community.jboss.org/people/blabno] created the discussion "Job manager/dispatcher pattern" To view the discussion, visit: https://community.jboss.org/message/822316#822316 -------------------------------------------------------------- Hello In my app there are some long running tasks that can be started from web front-end. Admin should see progress of those tasks in the same front-end. What is the best approach to implement this? Right now I have 1 ApplicationScoped JobManager and ~20 task executors running on separate JVM's (simple standalone apps). Those executors periodically (fast) pool JobManager for jobs through JAX-RS. JobManager must know which job is executed by which executor so that it's not done twice. Also that information must be persistent (in case of JobManager crash/restart). {code:lang=java} public String assignJob(String executorId) {     Job job = get1stUnassignedJobFromDB();     job.setExecutorId(executorId);     saveJobInDB(job);     return job.getId(); }{code} The problem is that sometimes executor 1 gets job A, the transaction doesn't get commited yet and the executor 2 also get's the same job. -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/822316#822316] Start a new discussion in EJB3 at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]