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Run a single task and return a result [deprecated]


GearmanClient::do

(PECL gearman >= 0.5.0)

GearmanClient::doRun a single task and return a result [deprecated]

Description

public string GearmanClient::do ( string $function_name , string $workload [, string $unique ] )

The GearmanClient::do() method is deprecated as of pecl/gearman 1.0.0. Use GearmanClient::doNormal().

Parameters

function_name

A registered function the worker is to execute

workload

Serialized data to be processed

unique

A unique ID used to identify a particular task

Return Values

A string representing the results of running a task.

Examples

Example #1 Simple job submission with immediate return

<?php

# Client code

echo "Starting\n";

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

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

echo 
"Sending job\n";

$result $gmclient->doNormal("reverse""Hello!");

echo 
"Success: $result\n";

?>
<?php

echo "Starting\n";

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

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

# Register function "reverse" with the server. Change the worker function to
# "reverse_fn_fast" for a faster worker with no output.
$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($job)
{
  return 
strrev($job->workload());
}

?>

The above example will output something similar to:

 Starting Sending job Success: !olleH 

Example #2 Submitting a job and retrieving incremental status

A job is submitted and the script loops to retrieve status information. The worker has an artificial delay which results in a long running job and sends status and data as processing occurs. Each subsequent call to GearmanClient::do() produces status information on the running job.

<?php

# Client code

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

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

echo 
"Sending job\n";

# Send reverse job
do
{
  
$result $gmclient->doNormal("reverse""Hello!");
  
# Check for various return packets and errors.

  
switch($gmclient->returnCode())
  {
    case 
GEARMAN_WORK_DATA:
      echo 
"Data: $result\n";
      break;
    case 
GEARMAN_WORK_STATUS:
      list(
$numerator$denominator)= $gmclient->doStatus();
      echo 
"Status: $numerator/$denominator complete\n";
      break;
    case 
GEARMAN_WORK_FAIL:
      echo 
"Failed\n";
      exit;
    case 
GEARMAN_SUCCESS:
      break;
    default:
      echo 
"RET: " $gmclient->returnCode() . "\n";
      echo 
"Error: " $gmclient->error() . "\n";
      echo 
"Errno: " $gmclient->getErrno() . "\n";
      exit;
  }
}
while(
$gmclient->returnCode() != GEARMAN_SUCCESS);

echo 
"Success: $result\n";

?>
<?php

# Worker code

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: " $x "/$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;
}

?>

The above example will output something similar to:

Worker output:

 Starting Waiting for job... Received job: H:foo.local:106 Workload: Hello! (6) 1/6 complete 2/6 complete 3/6 complete 4/6 complete 5/6 complete 6/6 complete Result: !olleH 

Client output:

 Starting Sending job Status: 1/6 complete Data: H Status: 2/6 complete Data: e Status: 3/6 complete Data: l Status: 4/6 complete Data: l Status: 5/6 complete Data: o Status: 6/6 complete Data: ! Success: !olleH 

See Also



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