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    GearmanClient::addTask

    (PECL gearman >= 0.5.0)

    GearmanClient::addTask — Add a task to be run in parallel

    설명

    public GearmanTask GearmanClient::addTask ( string $function_name , string $workload [, mixed &$context [, string $unique ]] )

    Adds a 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. Note that enough workers need to be available for the tasks to all run in parallel.

    인수

    function_name

    워커가 실행할 등록된 함수

    workload

    처리할 직렬화된 데이터

    context

    태스크에 할당된 어플리케이션 컨텍스트

    unique

    특정 태스크를 인식하는데 사용하는 고유 ID

    반환값

    A GearmanTask object or FALSE if the task could not be added.

    예제

    Example #1 Basic submission of two tasks

    <?php

    # Create our gearman client
    $gmclient= new GearmanClient(); 

    # add the default job server
    $gmclient->addServer(); 

    # set a function to be called when the work is complete
    $gmclient->setCompleteCallback("complete"); 

    # add a task to perform the "reverse" function on the string "Hello World!"
    $gmclient->addTask("reverse", "Hello World!", null, "1"); 

    # add another task to perform the "reverse" function on the string "!dlroW olleH"
    $gmclient->addTask("reverse", "!dlroW olleH", null, "2"); 

    # run the tasks
    $gmclient->runTasks(); 

    function     complete($task) 
    { 
      print     "COMPLETE: " . $task->unique() . ", " . $task->data() . "\n"; 
    }

    ?>

    위 예제의 출력 예시:

    COMPLETE: 2, Hello World!
COMPLETE: 1, !dlroW olleH

    Example #2 Basic submission of two tasks with passing application context

    <?php

    $client     = new GearmanClient();
    $client->addServer();

    # set a function to be called when the work is complete
    $client->setCompleteCallback("reverse_complete");

    # Add some tasks for a placeholder of where to put the results
    $results = array();
    $client->addTask("reverse", "Hello World!", &$results, "t1");
    $client->addTask("reverse", "!dlroW olleH", &$results, "t2");

    $client->runTasks();

    # The results should now be filled in from the callbacks
    foreach ($results as $id => $result)
       echo     $id . ": " . $result['handle'] . ", " . $result['data'] . "\n";


    function     reverse_complete($task, $results)
    {
           $results[$task->unique()] = array("handle"=>$task->jobHandle(), "data"=>$task->data());
    }

    ?>

    위 예제의 출력 예시:

    t2: H.foo:21, Hello World!
t1: H:foo:22, !dlroW olleH

    참고

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    User Contributed Notes 3 notes

    up
    7
    liv_romania at yahoo dot com
    9 years ago
    On PHP 5.5 you can use the following code for passing context by reference and avoid "Call-time pass-by-reference has been removed":

    <?php
    $client     = new GearmanClient();
    $client->addServer();

    # Set a function to be called when the work is complete
    $client->setCompleteCallback("reverse_complete");

    # Use StdClass instead of array
    $results = new StdClass();
    $results->value = array();

    # Add some tasks for a placeholder of where to put the results
    $client->addTask("reverse", "Hello World!", $results, "t1");
    $client->addTask("reverse", "!dlroW olleH", $results, "t2");

    $client->runTasks();

    # The results should now be filled in from the callbacks
    foreach ($results->value as $id => $result) {
        echo     $id . ": " . $result['handle'] . ", " . $result['data'] . "\n";
    }

    function     reverse_complete(GearmanTask $task, StdClass $results)
    {
            $results->value[$task->unique()] = array(
                "handle" => $task->jobHandle(),
                "data" => $task->data()
        );
    }
    ?>
    up
    1
    stanislav dot reshetnev at gmail dot com
    10 years ago
    Note that param $unique must be different for multiple tasks if You want to run they all separately. If param $unique is equal for multiple tasks You will get the same task:

    <?php
      $unique    =1;

          $gclient = GearmanClient();
          $gclient->addServer('srv'); 
     
          $this->setCreatedCallback(function(GearmanTask $task) {
        print     $task->jobHandle() . "\n";
      });
     
          $gclient->addTask('function_name', 'workload', null, $unique);
          $gclient->addTask('function_name', 'workload', null, $unique);
          $gclient->addTask('function_name', 'workload', null, $unique);
          $gclient->runTasks();
     
          sleep(5);
    ?>

    This sript will print only one handler:

    H:srv:377382343
    H:srv:377382343
    H:srv:377382343
    up
    0
    Jeremy Zerr
    11 years ago
    As of PHP 5.3.0, you will get a warning saying that "call-time pass-by-reference" is deprecated when you use & in $client->addTask(..., ..., &$results, ...);. And as of PHP 5.4.0, call-time pass-by-reference was removed, so using it will raise a fatal error.

    So that means that when you call addTask with a context parameter as in the example above like this:

    <?php
    # Add some tasks for a placeholder of where to put the results
    $results = array();
    $client->addTask("reverse", "Hello World!", &$results, "t1");
    ?>

    You get this "call-time pass-by-reference" warning (or error).  This can be avoided and still result in functional code by changing the context variable to be an object so that it is passed by reference like this:

    <?php
    $results     = new \stdClass();
    $client->addTask("reverse", "Hello World!", $results, "t1");
    ?>

    Then for completeness, change the complete handler to expect a reference:

    <?php
    function reverse_complete($task, &$results) { ... }
    ?>

    Then inside the complete handler, you can use the $results object to save your results to be accessible outside the complete handler.
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