Basic Gearman client and worker, submitting tasks

    Example #1 Basic Gearman client and worker, submitting tasks

    In this example, the basic reverse client extended to run two tasks in parallel. The reverse worker is unchanged except to add sending of data back during processing.

    <?php

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

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

    # register some callbacks
    $gmc->setCreatedCallback("reverse_created");
    $gmc->setDataCallback("reverse_data");
    $gmc->setStatusCallback("reverse_status");
    $gmc->setCompleteCallback("reverse_complete");
    $gmc->setFailCallback("reverse_fail");

    # set some arbitrary application data
    $data['foo'] = 'bar';

    # add two tasks
    $task= $gmc->addTask("reverse", "foo", $data);
    $task2= $gmc->addTaskLow("reverse", "bar", NULL);

    # run the tasks in parallel (assuming multiple workers)
    if (! $gmc->runTasks())
    {
    echo     "ERROR " . $gmc->error() . "\n";
    exit;
    }

    echo     "DONE\n";

    function     reverse_created($task)
    {
    echo     "CREATED: " . $task->jobHandle() . "\n";
    }

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

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

    function     reverse_fail($task)
    {
    echo     "FAILED: " . $task->jobHandle() . "\n";
    }

    function     reverse_data($task)
    {
    echo     "DATA: " . $task->data() . "\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)
    {
    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;
    }

    # A much simpler and less verbose version of the above function would be:
    function reverse_fn_fast($job)
    {
    return     strrev($job->workload());
    }

    ?>

    The above example will output something similar to:

    % php reverse_worker.php
Starting
Waiting for job...
Received job: H:foo.local:45
Workload: foo (3)
1/3 complete
2/3 complete
3/3 complete
Result: oof
Received job: H:foo.local:44
Workload: bar (3)
1/3 complete
2/3 complete
3/3 complete
Result: rab

    % php reverse_client_task.php
CREATED: H:foo.local:44
CREATED: H:foo.local:45
STATUS: H:foo.local:45 - 1/3
DATA: f
STATUS: H:foo.local:45 - 2/3
DATA: o
STATUS: H:foo.local:45 - 3/3
DATA: o
COMPLETE: H:foo.local:45, oof
STATUS: H:foo.local:44 - 1/3
DATA: b
STATUS: H:foo.local:44 - 2/3
DATA: a
STATUS: H:foo.local:44 - 3/3
DATA: r
COMPLETE: H:foo.local:44, rab
DONE

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    User Contributed Notes 1 note

    up
    1
    septerrianin at mail dot ru
    5 years ago
    NOTE.
    The register of the callback functions needs BEFORE add a task.

    This example NOT working correctly:
    <?php
    # add tasks
    $task= $gmc->addTask("reverse", "foo", $data);

    # register some callbacks
    $gmc->setCreatedCallback("reverse_created");
    $gmc->setDataCallback("reverse_data");
    $gmc->setStatusCallback("reverse_status");
    $gmc->setCompleteCallback("reverse_complete");
    $gmc->setFailCallback("reverse_fail");

    # run the task
    $gmc->runTasks();
    ?>
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