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 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
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