PHP 5.4.36 Released

GearmanClient::addTaskBackground

(PECL gearman >= 0.5.0)

GearmanClient::addTaskBackgroundAdd a background task to be run in parallel

설명

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

Adds a background 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.

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 Two tasks, one background and one not

This example illustrates the difference between running a background task and a normal task. The client adds two tasks to execute the same function, but one is added with addTaskBackground(). A callback is set so that progress of the job can be tracked. A simple worker with an artificial delay reports on the job progress and the client picks this up through the callback. Two workers are run for this example. Note that the background task does not show in the client output.

<?php

# The client script

# create our gearman client
$gmc= new GearmanClient();

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

# set a couple of callbacks so we can track progress
$gmc->setCompleteCallback("reverse_complete");
$gmc->setStatusCallback("reverse_status");

# add a task for the "reverse" function
$task$gmc->addTask("reverse""Hello World!"null"1");

# add another task, but this one to run in the background
$task$gmc->addTaskBackground("reverse""!dlroW olleH"null"2");

if (! 
$gmc->runTasks())
{
    echo 
"ERROR " $gmc->error() . "\n";
    exit;
}

echo 
"DONE\n";

function 
reverse_status($task)
{
    echo 
"STATUS: " $task->unique() . ", " $task->jobHandle() . " - " $task->taskNumerator() . 
         
"/" $task->taskDenominator() . "\n";
}

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

?>
<?php

# The worker script

echo "Starting\n";

# Create our worker object.
$gmworker= new GearmanWorker();

# Add default server (localhost).
$gmworker->addServer();

# Register function "reverse" with the server.
$gmworker->addFunction("reverse""reverse_fn");

print 
"Waiting for job...\n";
while(
$gmworker->work())
{
  if (
$gmworker->returnCode() != GEARMAN_SUCCESS)
  {
    echo 
"return_code: " $gmworker->returnCode() . "\n";
    break;
  }
}

function 
reverse_fn($job)
{
  echo 
"Received job: " $job->handle() . "\n";

  
$workload $job->workload();
  
$workload_size $job->workloadSize();

  echo 
"Workload: $workload ($workload_size)\n";

  
# This status loop is not needed, just showing how it works
  
for ($x0$x $workload_size$x++)
  {
    echo 
"Sending status: " . ($x 1) . "/$workload_size complete\n";
    
$job->sendStatus($x+1$workload_size);
    
$job->sendData(substr($workload$x1));
    
sleep(1);
  }

  
$resultstrrev($workload);
  echo 
"Result: $result\n";

  
# Return what we want to send back to the client.
  
return $result;
}

?>

Worker output for two workers running:

Received job: H:foo.local:65
Workload: !dlroW olleH (12)
1/12 complete
Received job: H:foo.local:66
Workload: Hello World! (12)
1/12 complete
2/12 complete
2/12 complete
3/12 complete
3/12 complete
4/12 complete
4/12 complete
5/12 complete
5/12 complete
6/12 complete
6/12 complete
7/12 complete
7/12 complete
8/12 complete
8/12 complete
9/12 complete
9/12 complete
10/12 complete
10/12 complete
11/12 complete
11/12 complete
12/12 complete
12/12 complete
Result: !dlroW olleH
Result: Hello World!

Client output:

STATUS: 1, H:foo.local:66 - 1/12
STATUS: 1, H:foo.local:66 - 2/12
STATUS: 1, H:foo.local:66 - 3/12
STATUS: 1, H:foo.local:66 - 4/12
STATUS: 1, H:foo.local:66 - 5/12
STATUS: 1, H:foo.local:66 - 6/12
STATUS: 1, H:foo.local:66 - 7/12
STATUS: 1, H:foo.local:66 - 8/12
STATUS: 1, H:foo.local:66 - 9/12
STATUS: 1, H:foo.local:66 - 10/12
STATUS: 1, H:foo.local:66 - 11/12
STATUS: 1, H:foo.local:66 - 12/12
COMPLETE: 1, !dlroW olleH
DONE

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