(PECL gearman >= 0.5.0)
GearmanClient::addTaskHigh — Add a high priority task to run in parallel
$function_name
, string $workload
[, mixed &$context
[, string $unique
]] )Adds a high priority task to be run in parallel with other tasks. Call this method for all the high priority tasks to be run in parallel, then call GearmanClient::runTasks() to perform the work. Tasks with a high priority will be selected from the queue before those of normal or low priority.
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。
A GearmanTask object or FALSE if the task could not be added.
Example #1 A high priority task along with two normal tasks
A high priority task is included among two other tasks. A single worker is available, so that tasks are run one at a time, with the high priority task run first.
<?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 high priority
$task= $gmc->addTask("reverse", "Hello World!", null, "1");
$task= $gmc->addTaskHigh("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: 2, Hello World! COMPLETE: 3, !dlroW olleH COMPLETE: 1, !dlroW olleH DONE