GearmanClient::addTaskLow

(PECL gearman >= 0.5.0)

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

说明

public GearmanClient::addTaskLow ( string $function_name , string $workload [, mixed &$context [, string $unique ]] ) : GearmanTask

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.

参数

function_name

由程序自动执行的已注册函数。

workload

被处理的序列化数据。

context

与任务关联的应用程序上下文。

unique

用于标识特定任务的唯一性 ID。

返回值

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

范例

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";
}

?>

以上例程的输出类似于：

COMPLETE: 3, !dlroW olleH
COMPLETE: 1, !dlroW olleH
COMPLETE: 2, Hello World!
DONE

参见