GearmanClient::doBackground

    (PECL gearman >= 0.5.0)

    GearmanClient::doBackground — Run a task in the background

    Опис

    public GearmanClient::doBackground(string $function, string $workload, ?string $unique = null): string

    Runs a task in the background, returning a job handle which can be used to get the status of the running task.

    Параметри

    function

    Зареєстрована функція, яку викликає робочий процес

    workload

    Серіалізовані дані для обробки

    unique

    Унікальний ID завдання

    Значення, що повертаються

    The job handle for the submitted task.

    Приклади

    Приклад #1 Submit and monitor a background job

    The worker in this example has an artificial delay introduced to mimic a long running job. The client script periodically checks the status of the running job.

    <?php

    /* create our object */
    $gmclient= new GearmanClient();

    /* add the default server */
    $gmclient->addServer();

    /* run reverse client */
    $job_handle = $gmclient->doBackground("reverse", "this is a test");

    if (    $gmclient->returnCode() != GEARMAN_SUCCESS)
    {
    echo     "bad return code\n";
    exit;
    }

    $done = false;
    do
    {
    sleep(3);
    $stat = $gmclient->jobStatus($job_handle);
    if (!    $stat[0]) // the job is known so it is not done
    $done = true;
    echo     "Running: " . ($stat[1] ? "true" : "false") . ", numerator: " . $stat[2] . ", denominator: " . $stat[3] . "\n";
    }
    while(!    $done);

    echo     "done!\n";

    ?>

    Поданий вище приклад виведе щось схоже на:

    Running: true, numerator: 3, denominator: 14
Running: true, numerator: 6, denominator: 14
Running: true, numerator: 9, denominator: 14
Running: true, numerator: 12, denominator: 14
Running: false, numerator: 0, denominator: 0
done!

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    User Contributed Notes 1 note

    up
    7
    felix at passcod dot name
    7 years ago
    Behaviour of the unique ID argument:

    If it's not provided, it defaults to a UUIDv1 (timestamp + mac address).

    Otherwise, if a job with the same unique ID exists (i.e. is either queued or currently executing), then that job is used, not the one you're submitting. This does not apply to past (completed) jobs, and works across the entire job server pool, assuming no partitioning.

    Or with code (the values in [brackets] are the server-assigned job identifiers):

    <?php

    $gearman    ->doBackground('sleep', '3', '123'); // [H:host:1] Starts sleep(3)
    $gearman->doBackground('sleep', '5', '456'); // [H:host:2] Queues sleep(5)
    $gearman->doBackground('sleep', '3', '123'); // [H:host:1] Does nothing
    $gearman->doBackground('sleep', '1', '123'); // [H:host:1] Also does nothing (diff args don't trigger new jobs)

    sleep (3);
    // Job 123 [sleep(3)] has finished by now

    $gearman->doBackground('sleep', '3', '123'); // [H:host:3] Starts a new job

    ?>
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