Php/docs/gearmanclient.addtasklow
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 $unique
]] ) : GearmanTask
Adds a low priority background task to be run in parallel with other tasks. Call this method for all the tasks to be run in parallel, then call GearmanClient::runTasks() to perform the work. Tasks with a low priority will be selected from the queue after those of normal or low priority.
参数
function_name- 由程序自动执行的已注册函数。
workload- 被处理的序列化数据。
context- 与任务关联的应用程序上下文。
unique- 用于标识特定任务的唯一性 ID。
范例
Example #1 A low priority task along with two normal tasks
A low priority task is included among two other tasks. A single worker is available, so that tasks are run one at a time, with the low priority task run last.
<?php# create the gearman client$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
- 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
