Examples with AcquireAsyncJobsDueCmd org.activiti.engine.impl.cmd.AcquireAsyncJobsDueCmd used on opensource projects

Example 1 with AcquireAsyncJobsDueCmd

use of org.activiti.engine.impl.cmd.AcquireAsyncJobsDueCmd in project Activiti by Activiti.

the class AcquireAsyncJobsDueRunnable method run.

public synchronized void run() {
    log.info("starting to acquire async jobs due");
    final CommandExecutor commandExecutor = asyncExecutor.getCommandExecutor();
    while (!isInterrupted) {
        try {
            AcquiredJobEntities acquiredJobs = commandExecutor.execute(new AcquireAsyncJobsDueCmd(asyncExecutor));
            boolean allJobsSuccessfullyOffered = true;
            for (JobEntity job : acquiredJobs.getJobs()) {
                boolean jobSuccessFullyOffered = asyncExecutor.executeAsyncJob(job);
                if (!jobSuccessFullyOffered) {
                    allJobsSuccessfullyOffered = false;
                }
            }
            // If all jobs are executed, we check if we got back the amount we expected
            // If not, we will wait, as to not query the database needlessly. 
            // Otherwise, we set the wait time to 0, as to query again immediately.
            millisToWait = asyncExecutor.getDefaultAsyncJobAcquireWaitTimeInMillis();
            int jobsAcquired = acquiredJobs.size();
            if (jobsAcquired >= asyncExecutor.getMaxAsyncJobsDuePerAcquisition()) {
                millisToWait = 0;
            }
            // If the queue was full, we wait too (even if we got enough jobs back), as not overload the queue
            if (millisToWait == 0 && !allJobsSuccessfullyOffered) {
                millisToWait = asyncExecutor.getDefaultQueueSizeFullWaitTimeInMillis();
            }
        } catch (ActivitiOptimisticLockingException optimisticLockingException) {
            if (log.isDebugEnabled()) {
                log.debug("Optimistic locking exception during async job acquisition. If you have multiple async executors running against the same database, " + "this exception means that this thread tried to acquire a due async job, which already was acquired by another async executor acquisition thread." + "This is expected behavior in a clustered environment. " + "You can ignore this message if you indeed have multiple async executor acquisition threads running against the same database. " + "Exception message: {}", optimisticLockingException.getMessage());
            }
        } catch (Throwable e) {
            log.error("exception during async job acquisition: {}", e.getMessage(), e);
            millisToWait = asyncExecutor.getDefaultAsyncJobAcquireWaitTimeInMillis();
        }
        if (millisToWait > 0) {
            try {
                if (log.isDebugEnabled()) {
                    log.debug("async job acquisition thread sleeping for {} millis", millisToWait);
                }
                synchronized (MONITOR) {
                    if (!isInterrupted) {
                        isWaiting.set(true);
                        MONITOR.wait(millisToWait);
                    }
                }
                if (log.isDebugEnabled()) {
                    log.debug("async job acquisition thread woke up");
                }
            } catch (InterruptedException e) {
                if (log.isDebugEnabled()) {
                    log.debug("async job acquisition wait interrupted");
                }
            } finally {
                isWaiting.set(false);
            }
        }
    }
    log.info("stopped async job due acquisition");
}