NAME

Gearman::Client - Client for gearman distributed job system

SYNOPSIS

use Gearman::Client;
my $client = Gearman::Client->new;
$client->job_servers('127.0.0.1', '10.0.0.1');

# running a single task
my $result_ref = $client->do_task("add", "1+2");
print "1 + 2 = $$result_ref\n";

# waiting on a set of tasks in parallel
my $taskset = $client->new_task_set;
$taskset->add_task( "add" => "1+2", {
   on_complete => sub { ... }
});
$taskset->add_task( "divide" => "5/0", {
   on_fail => sub { print "divide by zero error!\n"; },
});
$taskset->wait;

DESCRIPTION

Gearman::Client is a client class for the Gearman distributed job system, providing a framework for sending jobs to one or more Gearman servers. These jobs are then distributed out to a farm of workers.

Callers instantiate a Gearman::Client object and from it dispatch single tasks, sets of tasks, or check on the status of tasks.

USAGE

Gearman::Client->new(%options)

Creates a new Gearman::Client object, and returns the object.

If %options is provided, initializes the new client object with the settings in %options, which can contain:

• job_servers

  Calls job_servers (see below) to initialize the list of job servers. Value in this case should be an arrayref.

• prefix

  Calls prefix (see below) to set the prefix / namespace.

$client->job_servers(@servers)

Initializes the client $client with the list of job servers in @servers. @servers should contain a list of IP addresses, with optional port numbers. For example:

$client->job_servers('127.0.0.1', '192.168.1.100:7003');

If the port number is not provided, 7003 is used as the default.

$client->do_task($task)

$client->do_task($funcname, $arg, \%options)

Dispatches a task and waits on the results. May either provide a Gearman::Task object, or the 3 arguments that the Gearman::Task constructor takes.

Returns a scalar reference to the result, or undef on failure.

If you provide on_complete and on_fail handlers, they're ignored, as this function currently overrides them.

$client->dispatch_background($task)

$client->dispatch_background($funcname, $arg, \%options)

Dispatches a task and doesn't wait for the result. Return value is an opaque scalar that can be used to refer to the task.

$taskset = $client->new_task_set

Creates and returns a new Gearman::Taskset object.

$taskset->add_task($task)

$taskset->add_task($funcname, $arg, $uniq)

$taskset->add_task($funcname, $arg, \%options)

Adds a task to a taskset. Three different calling conventions are available.

$taskset->wait

Waits for a response from the job server for any of the tasks listed in the taskset. Will call the on_* handlers for each of the tasks that have been completed, updated, etc. Doesn't return until everything has finished running or failing.

$client->prefix($prefix)

Sets the namespace / prefix for the function names.

See Gearman::Worker for more details.

EXAMPLES

Summation

This is an example client that sends off a request to sum up a list of integers.

use Gearman::Client;
use Storable qw( freeze );
my $client = Gearman::Client->new;
$client->job_servers('127.0.0.1');
my $tasks = $client->new_task_set;
my $handle = $tasks->add_task(sum => freeze([ 3, 5 ]), {
    on_complete => sub { print ${ $_[0] }, "\n" }
});
$tasks->wait;

See the Gearman::Worker documentation for the worker for the sum function.

COPYRIGHT

Copyright 2006-2007 Six Apart, Ltd.

License granted to use/distribute under the same terms as Perl itself.

WARRANTY

This is free software. This comes with no warranty whatsoever.

AUTHORS

Brad Fitzpatrick (brad@danga.com)
Jonathan Steinert (hachi@cpan.org)

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