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

COPYRIGHT

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>