@SuppressWarnings("rawtypes")
@Override
protected Collection acquireJobs() {
Collection jobs = Collections.EMPTY_LIST;
if ((isActive) && (!alfrescoJobExecutor.getTransactionService().isReadOnly())) {
try {
jobs =
alfrescoJobExecutor
.getTransactionService()
.getRetryingTransactionHelper()
.doInTransaction(
new RetryingTransactionHelper.RetryingTransactionCallback<Collection>() {
public Collection execute() throws Throwable {
if (jobLockToken != null) {
refreshExecutorLock(jobLockToken);
} else {
jobLockToken = getExecutorLock();
}
try {
return AlfrescoJobExecutorThread.super.acquireJobs();
} catch (Throwable t) {
logger.error("Failed to acquire jobs");
releaseExecutorLock(jobLockToken);
jobLockToken = null;
throw t;
}
}
});
if (jobs != null) {
if (logger.isDebugEnabled() && (!logger.isTraceEnabled()) && (!jobs.isEmpty())) {
logger.debug("acquired " + jobs.size() + " job" + ((jobs.size() != 1) ? "s" : ""));
}
if (logger.isTraceEnabled()) {
logger.trace(
"acquired "
+ jobs.size()
+ " job"
+ ((jobs.size() != 1) ? "s" : "")
+ ((jobs.size() > 0) ? ": " + jobs.toString() : ""));
}
if (jobs.size() == 0) {
releaseExecutorLock(jobLockToken);
jobLockToken = null;
}
}
} catch (LockAcquisitionException e) {
// ignore
jobLockToken = null;
}
}
return jobs;
}
private String getExecutorLock() {
String lockToken = null;
if (alfrescoJobExecutor.getJobExecutorLockEnabled()) {
try {
lockToken =
alfrescoJobExecutor.getJobLockService().getLock(LOCK_QNAME, jobLockTTL, 3000, 10);
if (logger.isTraceEnabled()) {
logger.trace(Thread.currentThread().getName() + " got lock token: " + lockToken);
}
} catch (LockAcquisitionException e) {
if (logger.isTraceEnabled()) {
logger.trace(
"Failed to get Alfresco Job Executor lock - may already running in another thread");
}
throw e;
}
}
return lockToken;
}
@Override
protected Date getNextDueDate() {
if (!isActive) {
return null;
}
return alfrescoJobExecutor
.getTransactionService()
.getRetryingTransactionHelper()
.doInTransaction(
new RetryingTransactionHelper.RetryingTransactionCallback<Date>() {
public Date execute() throws Throwable {
return AlfrescoJobExecutorThread.super.getNextDueDate();
}
},
true);
}
private void releaseExecutorLock(String lockToken) {
if (lockToken != null) {
try {
alfrescoJobExecutor.getJobLockService().releaseLock(lockToken, LOCK_QNAME);
if (logger.isTraceEnabled()) {
logger.trace(Thread.currentThread().getName() + " released lock token: " + lockToken);
}
} catch (LockAcquisitionException e) {
if (logger.isTraceEnabled()) {
logger.trace(
"Failed to release Alfresco Job Executor lock - may no longer exist ("
+ lockToken
+ ")");
}
throw e;
}
}
}
/** {@inheritDoc} */
@Override
protected void executeJob(final Job jobIn) {
if ((!isActive) || (alfrescoJobExecutor.getTransactionService().isReadOnly())) {
return;
}
// based on JBPM 3.3.1 (JobExecutorThread.executeJob)
// - wrap executeJob / deleteJob in Alfresco retries
// - add setRollbackOnly warnings
// - if Alfresco retries fail, attempt to set JBPM job exception/retries
try {
RetryingTransactionHelper tranHelper =
alfrescoJobExecutor.getTransactionService().getRetryingTransactionHelper();
tranHelper.doInTransaction(
new RetryingTransactionCallback<Object>() {
public Object execute() throws Throwable {
JbpmContext jbpmContext = jbpmConfiguration.createJbpmContext();
try {
JobSession jobSession = jbpmContext.getJobSession();
Job job = jobSession.loadJob(jobIn.getId());
if (logger.isTraceEnabled()) {
logger.trace("executing " + job);
}
if (job.execute(jbpmContext)) {
jobSession.deleteJob(job);
if (logger.isDebugEnabled()) {
logger.debug("executed and deleted: " + job);
}
}
// if this job is locked too long
long totalLockTimeInMillis =
System.currentTimeMillis() - job.getLockTime().getTime();
if (totalLockTimeInMillis > jbpmMaxLockTime) {
logger.warn(
"setRollbackOnly: exceeded maxLockTime (" + jbpmMaxLockTime + ") " + job);
jbpmContext.setRollbackOnly();
}
} finally {
jbpmContext.close();
}
return null;
}
});
} catch (LockAcquisitionException e) {
// ignore
jobLockToken = null;
} catch (Exception e) {
if (logger.isErrorEnabled()) {
logger.error("failed to execute " + jobIn, e);
}
if (!isPersistenceException(e)) {
try {
final StringWriter memoryWriter = new StringWriter();
e.printStackTrace(new PrintWriter(memoryWriter));
RetryingTransactionHelper tranHelper =
alfrescoJobExecutor.getTransactionService().getRetryingTransactionHelper();
tranHelper.doInTransaction(
new RetryingTransactionCallback<Object>() {
public Object execute() throws Throwable {
JbpmContext jbpmContext = jbpmConfiguration.createJbpmContext();
try {
JobSession jobSession = jbpmContext.getJobSession();
final Job job = jobSession.loadJob(jobIn.getId());
if (logger.isDebugEnabled()) {
logger.debug("attempting to update exception/retries: " + job);
}
job.setException(memoryWriter.toString());
job.setRetries(job.getRetries() - 1);
if (logger.isInfoEnabled()) {
logger.info(
"updated job exception and set to "
+ job.getRetries()
+ " retries: "
+ jobIn);
}
} finally {
jbpmContext.close();
}
return null;
}
});
} catch (Exception e2) {
if (logger.isErrorEnabled()) {
logger.error("failed to update job exception/retries " + jobIn, e2);
}
}
}
}
}
