Gearman PHP, sendComplete has no effect - php

Question

Have successfully connected Gearman to an existing PHP project. Using supervisord to ensure that the workers are running, it has produced pretty good results!
I have a critical issue, however, in that the "setCompleteCallback" is not working at all.
Split up somewhat like this:
Client
$client = new GearmanClient();
$client->addServer();
$client->setCompleteCallback(
array( 'LDPE_Service_AWSConnect_Transfer_Target', 'transferComplete' ) );
// push core to S3 bucket
$target = new LDPE_Service_AWSConnect_Transfer_Target( $transaction->id,
"/usr/local/include/LDP/", LDPE_Service_S3::BUCKET_CORE );
// push S3 bucket to instances
foreach( $aws_target_list as $dns )
{
$target->addChildRequest(
new LDPE_Service_AWSConnect_Transfer_Target( $transaction->id,
null, LDPE_Service_S3::BUCKET_CORE, $dns )
);
}
$client->addTaskBackground( 'transferStart', serialize( $target ) );
$client->runTasks();
Worker
(basically bootstraps a Zend Framework environment, and loads the exec functions)
include 'bootstrap.php';
ini_set('memory_limit', -1);
$worker = new GearmanWorker();
$worker->addServer();
$worker->addFunction( 'transferStart', array(
'LDPE_Service_AWSConnect_Transfer_Target', 'transferStart' ) );
while ($worker->work())
{
switch( $worker->returnCode() )
{
case GEARMAN_SUCCESS:
break;
default:
echo "ERROR RET: " . $worker->returnCode() . "\n";
exit;
}
}
Finally, here's the LDPE_Service_AWSConnect_Transfer_Target class that contains all of the heavy lifting. I've pruned out all of the logic, and it doesn't fire at all.
Implementation Methods
class LDPE_Service_AWSConnect_Transfer_Target {
public static function transferStart( GearmanJob $job )
{
$workload = $job->workload();
$target = unserialize( $workload );
echo "transferStart/begin [ " .
$target->getShortRepresentation() . " ]\n";
// perform a series of actions
echo "transferStart/complete [ " .
$target->getShortRepresentation() . " ]\n";
return serialize( $target );
}
public static function transferComplete( GearmanTask $task )
{
echo "transferComplete/begin\n";
$workload = $task->data();
$parent_target = unserialize( $workload );
echo "transferComplete/complete\n";
}
}
To be clear then, the "transferStart/begin" and "transferStart/complete" strings are correctly printed to logs, however, transferComplete/begin is never fired. What's going on?
Thanks!
Alex
Seems as though the callbacks don't fire when run in background mode..

Answer 1

Try setting the callback after your call to the process function
$client->addTaskBackground('my_task', 'payload');
$client->setCompleteCallback('complete');
$client->runTasks();

Answer 2

I had tried that, it really boiled down to having the client run as a Gearman task itself. The client was being invoked as a part of a browser-invoked page. Seems that the callback wasn't being honored under this context. The solution was to move the client that schedules the callbacks into a Gearman-run method. I added a "scheduleXXXX" function to the work, which pretty much called the flow above. This function received the "normal" function's input, serialized.