GearmanClient::addTaskBackground

(PECL gearman >= 0.5.0)

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

説明

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

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.

パラメータ

function_name

ワーカーが実行するために登録した関数。

workload

シリアライズしたデータ。

context

タスクに関連づけるアプリケーションコンテキスト。

unique

タスクを特定するために用いる一意な ID。

返り値

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

例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)
Sending status: 1/12 complete
Sending status: 2/12 complete
Sending status: 2/12 complete
Sending status: 3/12 complete
Sending status: 3/12 complete
Sending status: 4/12 complete
Sending status: 4/12 complete
Sending status: 5/12 complete
Sending status: 5/12 complete
Sending status: 6/12 complete
Sending status: 6/12 complete
Sending status: 7/12 complete
Sending status: 7/12 complete
Sending status: 8/12 complete
Sending status: 8/12 complete
Sending status: 9/12 complete
Sending status: 9/12 complete
Sending status: 10/12 complete
Sending status: 10/12 complete
Sending status: 11/12 complete
Sending status: 11/12 complete
Sending status: 12/12 complete
Sending status: 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

参考