Run a single task and return a result

GearmanClient::data
GearmanClient::doBackground
GearmanClient
PHP Manual

# GearmanClient::do

(PECL gearman >= 0.5.0)

GearmanClient::do — Run a single task and return a result

### Description

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

Runs a single task and returns a string representation of the result. It is up to the GearmanClient and GearmanWorker to agree on the format of the result.

### 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
?>`
`<?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->do("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 = $gmclient->do("reverse", "Hello!");
# Check for various return packets and errors.
switch($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 ($x= 0; $x < $workload_size; $x++)
{
echo "Sending status: " + $x + 1 . "/$workload_size complete\n";
$job->sendStatus($x+1, $workload_size);
$job->sendData(substr($workload, $x, 1));
sleep(1);
}
$result= strrev($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

- GearmanClient::doHigh - Run a single high priority task
- GearmanClient::doLow - Run a single low priority task
- GearmanClient::doBackground - Run a task in the background
- GearmanClient::doHighBackground - Run a high priority task in the background
- GearmanClient::doLowBackground - Run a low priority task in the background

GearmanClient::data
GearmanClient::doBackground
GearmanClient
PHP Manual