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.\" ========================================================================
.\"
.IX Title "Gearman::Client 3pm"
.TH Gearman::Client 3pm "2014-01-09" "perl v5.18.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Gearman::Client \- Client for gearman distributed job system
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 3
\&    use Gearman::Client;
\&    my $client = Gearman::Client\->new;
\&    $client\->job_servers(\*(Aq127.0.0.1\*(Aq, \*(Aq10.0.0.1\*(Aq);
\&
\&    # running a single task
\&    my $result_ref = $client\->do_task("add", "1+2");
\&    print "1 + 2 = $$result_ref\en";
\&
\&    # 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!\en"; },
\&    });
\&    $taskset\->wait;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fIGearman::Client\fR 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.
.PP
Callers instantiate a \fIGearman::Client\fR object and from it dispatch
single tasks, sets of tasks, or check on the status of tasks.
.SH "USAGE"
.IX Header "USAGE"
.SS "Gearman::Client\->new(%options)"
.IX Subsection "Gearman::Client->new(%options)"
Creates a new \fIGearman::Client\fR object, and returns the object.
.PP
If \fI\f(CI%options\fI\fR is provided, initializes the new client object with the
settings in \fI\f(CI%options\fI\fR, which can contain:
.IP "\(bu" 4
job_servers
.Sp
Calls \fIjob_servers\fR (see below) to initialize the list of job
servers.  Value in this case should be an arrayref.
.IP "\(bu" 4
prefix
.Sp
Calls \fIprefix\fR (see below) to set the prefix / namespace.
.ie n .SS "$client\->job_servers(@servers)"
.el .SS "\f(CW$client\fP\->job_servers(@servers)"
.IX Subsection "$client->job_servers(@servers)"
Initializes the client \fI\f(CI$client\fI\fR with the list of job servers in \fI\f(CI@servers\fI\fR.
\&\fI\f(CI@servers\fI\fR should contain a list of \s-1IP\s0 addresses, with optional port
numbers. For example:
.PP
.Vb 1
\&    $client\->job_servers(\*(Aq127.0.0.1\*(Aq, \*(Aq192.168.1.100:7003\*(Aq);
.Ve
.PP
If the port number is not provided, \f(CW7003\fR is used as the default.
.ie n .SS "$client\->do_task($task)"
.el .SS "\f(CW$client\fP\->do_task($task)"
.IX Subsection "$client->do_task($task)"
.ie n .SS "$client\->do_task($funcname, $arg, \e%options)"
.el .SS "\f(CW$client\fP\->do_task($funcname, \f(CW$arg\fP, \e%options)"
.IX Subsection "$client->do_task($funcname, $arg, %options)"
Dispatches a task and waits on the results.  May either provide a
Gearman::Task object, or the 3 arguments that the Gearman::Task
constructor takes.
.PP
Returns a scalar reference to the result, or undef on failure.
.PP
If you provide on_complete and on_fail handlers, they're ignored, as
this function currently overrides them.
.ie n .SS "$client\->dispatch_background($task)"
.el .SS "\f(CW$client\fP\->dispatch_background($task)"
.IX Subsection "$client->dispatch_background($task)"
.ie n .SS "$client\->dispatch_background($funcname, $arg, \e%options)"
.el .SS "\f(CW$client\fP\->dispatch_background($funcname, \f(CW$arg\fP, \e%options)"
.IX Subsection "$client->dispatch_background($funcname, $arg, %options)"
Dispatches a task and doesn't wait for the result.  Return value
is an opaque scalar that can be used to refer to the task.
.ie n .SS "$taskset = $client\->new_task_set"
.el .SS "\f(CW$taskset\fP = \f(CW$client\fP\->new_task_set"
.IX Subsection "$taskset = $client->new_task_set"
Creates and returns a new \fIGearman::Taskset\fR object.
.ie n .SS "$taskset\->add_task($task)"
.el .SS "\f(CW$taskset\fP\->add_task($task)"
.IX Subsection "$taskset->add_task($task)"
.ie n .SS "$taskset\->add_task($funcname, $arg, $uniq)"
.el .SS "\f(CW$taskset\fP\->add_task($funcname, \f(CW$arg\fP, \f(CW$uniq\fP)"
.IX Subsection "$taskset->add_task($funcname, $arg, $uniq)"
.ie n .SS "$taskset\->add_task($funcname, $arg, \e%options)"
.el .SS "\f(CW$taskset\fP\->add_task($funcname, \f(CW$arg\fP, \e%options)"
.IX Subsection "$taskset->add_task($funcname, $arg, %options)"
Adds a task to a taskset.  Three different calling conventions are
available.
.ie n .SS "$taskset\->wait"
.el .SS "\f(CW$taskset\fP\->wait"
.IX Subsection "$taskset->wait"
Waits for a response from the job server for any of the tasks listed
in the taskset. Will call the \fIon_*\fR handlers for each of the tasks
that have been completed, updated, etc.  Doesn't return until
everything has finished running or failing.
.ie n .SS "$client\->prefix($prefix)"
.el .SS "\f(CW$client\fP\->prefix($prefix)"
.IX Subsection "$client->prefix($prefix)"
Sets the namespace / prefix for the function names.
.PP
See Gearman::Worker for more details.
.SH "EXAMPLES"
.IX Header "EXAMPLES"
.SS "Summation"
.IX Subsection "Summation"
This is an example client that sends off a request to sum up a list of
integers.
.PP
.Vb 9
\&    use Gearman::Client;
\&    use Storable qw( freeze );
\&    my $client = Gearman::Client\->new;
\&    $client\->job_servers(\*(Aq127.0.0.1\*(Aq);
\&    my $tasks = $client\->new_task_set;
\&    my $handle = $tasks\->add_task(sum => freeze([ 3, 5 ]), {
\&        on_complete => sub { print ${ $_[0] }, "\en" }
\&    });
\&    $tasks\->wait;
.Ve
.PP
See the \fIGearman::Worker\fR documentation for the worker for the \fIsum\fR
function.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2006\-2007 Six Apart, Ltd.
.PP
License granted to use/distribute under the same terms as Perl itself.
.SH "WARRANTY"
.IX Header "WARRANTY"
This is free software.  This comes with no warranty whatsoever.
.SH "AUTHORS"
.IX Header "AUTHORS"
.Vb 2
\& Brad Fitzpatrick (brad@danga.com)
\& Jonathan Steinert (hachi@cpan.org)
.Ve