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(PECL gearman >= 0.5.0)
GearmanClient::do — Run a single task and return a result
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.
Die registrierte Funktion, die der Worker ausführen soll
Serialisierte Daten, die verarbeitet werden sollen
Eine eindeutige ID, die einen bestimmten Task identifiziert
A string representing the results of running a task.
Beispiel #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->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());
}
?>
Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:
Starting Sending job Success: !olleH
Beispiel #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;
}
?>
Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:
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
Note that this isn't blocking -- that do() will return as soon as the job is accepted by the Gearman jobserver.
That lets you do..while until the return code is success or failure as you see in the examples.
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