GearmanClient::addTaskLow

(PECL gearman >= 0.5.0)

GearmanClient::addTaskLow — Add a low priority task to run in parallel

Description

public GearmanClient::addTaskLow(
    string $function_name,
    string|int|float $workload,
    mixed $context = null,
    ?string $unique_key = null
): GearmanTask|false

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.

Parameters

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

Return Values

A GearmanTask object or false if the task could not be added.

Examples

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

See Also