(PECL gearman >= 0.5.0)
GearmanClient::addTaskLow — Add a low priority task to run in parallel
$function_name
,$workload
,$context
= null
,$unique_key
= null
Adds a low priority background task to be run in parallel with other tasks. Call this method for all the tasks to be run in parallel, then call GearmanClient::runTasks() to perform the work. Tasks with a low priority will be selected from the queue after those of normal or low priority.
function_name
A registered function the worker is to execute
workload
Serialized data to be processed
context
Application context to associate with a task
unique_key
A unique ID used to identify a particular task
A GearmanTask object or false
if the task could not be added.
Example #1 A low priority task along with two normal tasks
A low priority task is included among two other tasks. A single worker is available, so that tasks are run one at a time, with the low priority task run last.
<?php# create the gearman client$gmc= new GearmanClient();# add the default job server$gmc->addServer();# set the callback for when the job is complete$gmc->setCompleteCallback("reverse_complete");# add tasks, one of which is low priority$task= $gmc->addTask("reverse", "Hello World!", null, "1");$task= $gmc->addTaskLow("reverse", "!dlroW olleH", null, "2");$task= $gmc->addTask("reverse", "Hello World!", null, "3");if (! $gmc->runTasks()){ echo "ERROR " . $gmc->error() . "\n"; exit;}echo "DONE\n";function reverse_complete($task){ echo "COMPLETE: " . $task->unique() . ", " . $task->data() . "\n";}?>
The above example will output something similar to:
COMPLETE: 3, !dlroW olleH COMPLETE: 1, !dlroW olleH COMPLETE: 2, Hello World! DONE