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    GearmanClient::doBackground

    (PECL gearman >= 0.5.0)

    GearmanClient::doBackground — Run a task in the background

    Descrição

    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.

    Parâmetros

    function

    Uma função registrada que o trabalhador deve executar

    workload

    Dados serializados a serem processados

    unique

    Um identificador único usado para identificar uma tarefa específica

    Valor Retornado

    The job handle for the submitted task.

    Exemplos

    Exemplo #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";

    ?>

    O exemplo acima produzirá algo semelhante a:

    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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    Notas Enviadas por Usuários (em inglês) 1 note

    up
    8
    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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