GearmanClient::addTask

(PECL gearman >= 0.5.0)

GearmanClient::addTaskAdd a task to be run in parallel

Descrierea

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.

Parametri

function_name

O funcție înregistrată pe care trebuie să o execute serverul executor

workload

Datele serializate pentru a fi procesate

context

Contextul aplicației pentru a fi asociat cu o sarcină

unique

Un ID unical utilizat pentru a identifica o anumită sarcină

Valorile întoarse

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

Exemple

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"
}

?>

Exemplul de mai sus va afișa ceva similar cu:

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());
}

?>

Exemplul de mai sus va afișa ceva similar cu:

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

Vedeți de asemenea

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User Contributed Notes 2 notes

up
0
stanislav dot reshetnev at gmail dot com
27 days 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
-1
Jeremy Zerr
1 year 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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