GearmanClient::addTaskLow
(PECL gearman >= 0.5.0)
GearmanClient::addTaskLow — Add a low priority task to run in parallel
说明
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.
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_key -
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.
示例
示例 #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";
}
?>以上示例的输出类似于：
COMPLETE: 3, !dlroW olleH COMPLETE: 1, !dlroW olleH COMPLETE: 2, Hello World! DONE
参见
- GearmanClient::addTask() - Add a task to be run in parallel
- GearmanClient::addTaskHigh() - Add a high priority task to run in parallel
- GearmanClient::addTaskBackground() - Add a background task to be run in parallel
- GearmanClient::addTaskHighBackground() - Add a high priority background task to be run in parallel
- GearmanClient::addTaskLowBackground() - Add a low priority background task to be run in parallel
- GearmanClient::runTasks() - Run a list of tasks in parallel
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