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', '192.168.1.100:4730');If the port number is not provided, 4730 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 with get_status.
$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" }
});
$tasks->wait;See the Gearman::Worker documentation for the worker for the sum function.
METHODS
new_task_set()
return Gearman::Taskset
get_job_server_status()
return {job => {capable, queued, running}}
get_job_server_jobs()
supported only by Gearman::Server
return {job => {address, listeners, key}}
get_job_server_clients()
supported only by Gearman::Server
do_task($task)
do_task($funcname, $arg, \%options)
given a (func, arg_p, opts?)
return either undef (on fail) or scalarref of result
dispatch_background($func, $arg_p, $opts)
dispatch_background($task)
dispatches job in background
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