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Gearman::Client

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',
{
host => '10.0.0.1',
port => 4730,
socket_cb => sub {...},
use_ssl => 1,
ca_file => ...,
cert_file => ...,
key_file => ...,
}
);
# running a single task
my $result_ref = $client->do_task("add", "1+2", {
on_fail => sub {...},
on_complete => sub {...}
});
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.

Gearman::Client is derived from Gearman::Objects

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:

exceptions

If true, the client sends an OPTION_REQ exceptions <http://gearman.org/protocol/> request for each connection to the job server. This causes job server to forward WORK_EXCEPTION packets to the client.

job_servers

List of job servers. Value should be an array reference, hash reference or scalar.

Calls Gearman::Objects to set job_servers

prefix

Calls prefix (see Gearman::Objects) to set the prefix / namespace.

command_timeout

Maximum time a gearman command should take to get a result (not a job timeout)

default: 30 seconds

backoff_max

Max number of failed connection attempts before an job server will be temporary disabled

default: 90

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.

NOTE

If you intend using UTF-8 data with SSL based connection, beware there is no UTF-8 support in underlying Net::SSLeay. "Forcing-Unicode-in-Perl-(Or-Unforcing-Unicode-in-Perl)" in perlunicode describes proper workarounds.

METHODS

new_task_set()
Creates and returns a new Gearman::Taskset object.

get_job_server_status()
return
"{job_server => {job => {capable, queued, running}}}"

get_job_server_jobs()
supported only by Gearman::Server

return "{job-server => {job => {address, listeners, key}}}"

get_job_server_clients()
supported only by Gearman::Server

do_task($task)
do_task($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.

return scalarref of WORK_COMPLETE result, or undef on failure.

dispatch_background($func, $arg_p, $options_hr)
dispatch_background($task)

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 with get_status.

It is strongly recommended to set Gearman::Task "uniq" option to insure gearmand does not squash jobs if it store background jobs in a persistence backend. See the issue #87 <https://github.com/gearman/gearmand/issues/87#issuecomment-291119785>

return the handle from the jobserver, or undef on failure

run_hook($name)
run a hook callback if defined

add_hook($name, $cb)
add a hook

get_status($handle)
The Gearman Server will assign a scalar job handle when you request a background job with dispatch_background. Save this scalar, and use it later in order to request the status of this job.

return Gearman::JobStatus on success

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 at danga dot com>)
Jonathan Steinert (<hachi at cpan dot org>)
Alexei Pastuchov (<palik at cpan dot org>) co-maintainer

REPOSITORY

<https://github.com/p-alik/perl-Gearman.git>

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