Provided by: libminion-perl_7.05-1_all 
NAME
Minion::Backend - Backend base class
SYNOPSIS
package Minion::Backend::MyBackend;
use Mojo::Base 'Minion::Backend';
sub broadcast {...}
sub dequeue {...}
sub enqueue {...}
sub fail_job {...}
sub finish_job {...}
sub job_info {...}
sub list_jobs {...}
sub list_workers {...}
sub lock {...}
sub note {...}
sub receive {...}
sub register_worker {...}
sub remove_job {...}
sub repair {...}
sub reset {...}
sub retry_job {...}
sub stats {...}
sub unlock {...}
sub unregister_worker {...}
sub worker_info {...}
DESCRIPTION
Minion::Backend is an abstract base class for Minion backends, like Minion::Backend::Pg.
ATTRIBUTES
Minion::Backend implements the following attributes.
minion
my $minion = $backend->minion;
$backend = $backend->minion(Minion->new);
Minion object this backend belongs to.
METHODS
Minion::Backend inherits all methods from Mojo::Base and implements the following new ones.
broadcast
my $bool = $backend->broadcast('some_command');
my $bool = $backend->broadcast('some_command', [@args]);
my $bool = $backend->broadcast('some_command', [@args], [$id1, $id2, $id3]);
Broadcast remote control command to one or more workers.
dequeue
my $job_info = $backend->dequeue($worker_id, 0.5);
my $job_info = $backend->dequeue($worker_id, 0.5, {queues => ['important']});
Wait a given amount of time in seconds for a job, dequeue it and transition from "inactive" to "active"
state, or return "undef" if queues were empty. Meant to be overloaded in a subclass.
These options are currently available:
id
id => '10023'
Dequeue a specific job.
queues
queues => ['important']
One or more queues to dequeue jobs from, defaults to "default".
These fields are currently available:
args
args => ['foo', 'bar']
Job arguments.
id
id => '10023'
Job ID.
retries
retries => 3
Number of times job has been retried.
task
task => 'foo'
Task name.
enqueue
my $job_id = $backend->enqueue('foo');
my $job_id = $backend->enqueue(foo => [@args]);
my $job_id = $backend->enqueue(foo => [@args] => {priority => 1});
Enqueue a new job with "inactive" state. Meant to be overloaded in a subclass.
These options are currently available:
attempts
attempts => 25
Number of times performing this job will be attempted, with a delay based on "backoff" in Minion after
the first attempt, defaults to 1.
delay
delay => 10
Delay job for this many seconds (from now), defaults to 0.
notes
notes => {foo => 'bar', baz => [1, 2, 3]}
Hash reference with arbitrary metadata for this job.
parents
parents => [$id1, $id2, $id3]
One or more existing jobs this job depends on, and that need to have transitioned to the state
"finished" before it can be processed.
priority
priority => 5
Job priority, defaults to 0. Jobs with a higher priority get performed first.
queue
queue => 'important'
Queue to put job in, defaults to "default".
fail_job
my $bool = $backend->fail_job($job_id, $retries);
my $bool = $backend->fail_job($job_id, $retries, 'Something went wrong!');
my $bool = $backend->fail_job(
$job_id, $retries, {whatever => 'Something went wrong!'});
Transition from "active" to "failed" state, and if there are attempts remaining, transition back to
"inactive" with a delay based on "backoff" in Minion. Meant to be overloaded in a subclass.
finish_job
my $bool = $backend->finish_job($job_id, $retries);
my $bool = $backend->finish_job($job_id, $retries, 'All went well!');
my $bool = $backend->finish_job(
$job_id, $retries, {whatever => 'All went well!'});
Transition from "active" to "finished" state. Meant to be overloaded in a subclass.
job_info
my $job_info = $backend->job_info($job_id);
Get information about a job, or return "undef" if job does not exist. Meant to be overloaded in a
subclass.
# Check job state
my $state = $backend->job_info($job_id)->{state};
# Get job result
my $result = $backend->job_info($job_id)->{result};
These fields are currently available:
args
args => ['foo', 'bar']
Job arguments.
attempts
attempts => 25
Number of times performing this job will be attempted.
children
children => ['10026', '10027', '10028']
Jobs depending on this job.
created
created => 784111777
Epoch time job was created.
delayed
delayed => 784111777
Epoch time job was delayed to.
finished
finished => 784111777
Epoch time job was finished.
notes
notes => {foo => 'bar', baz => [1, 2, 3]}
Hash reference with arbitrary metadata for this job.
parents
parents => ['10023', '10024', '10025']
Jobs this job depends on.
priority
priority => 3
Job priority.
queue
queue => 'important'
Queue name.
result
result => 'All went well!'
Job result.
retried
retried => 784111777
Epoch time job has been retried.
retries
retries => 3
Number of times job has been retried.
started
started => 784111777
Epoch time job was started.
state
state => 'inactive'
Current job state, usually "active", "failed", "finished" or "inactive".
task
task => 'foo'
Task name.
worker
worker => '154'
Id of worker that is processing the job.
list_jobs
my $batch = $backend->list_jobs($offset, $limit);
my $batch = $backend->list_jobs($offset, $limit, {state => 'inactive'});
Returns the same information as "job_info" but in batches. Meant to be overloaded in a subclass.
These options are currently available:
queue
queue => 'important'
List only jobs in this queue.
state
state => 'inactive'
List only jobs in this state.
task
task => 'test'
List only jobs for this task.
list_workers
my $batch = $backend->list_workers($offset, $limit);
Returns the same information as "worker_info" but in batches. Meant to be overloaded in a subclass.
lock
my $bool = $backend->lock('foo', 3600);
my $bool = $backend->lock('foo', 3600, {limit => 20});
Try to acquire a named lock that will expire automatically after the given amount of time in seconds.
These options are currently available:
limit
limit => 20
Number of shared locks with the same name that can be active at the same time, defaults to 1.
note
$backend->note($job_id, foo => 'bar');
Change a metadata field for a job.
receive
my $commands = $backend->receive($worker_id);
Receive remote control commands for worker.
register_worker
my $worker_id = $backend->register_worker;
my $worker_id = $backend->register_worker($worker_id);
my $worker_id = $backend->register_worker(
$worker_id, {status => {queues => ['default', 'important']}});
Register worker or send heartbeat to show that this worker is still alive. Meant to be overloaded in a
subclass.
These options are currently available:
status
status => {queues => ['default', 'important']}
Hash reference with whatever status information the worker would like to share.
remove_job
my $bool = $backend->remove_job($job_id);
Remove "failed", "finished" or "inactive" job from queue. Meant to be overloaded in a subclass.
repair
$backend->repair;
Repair worker registry and job queue if necessary. Meant to be overloaded in a subclass.
reset
$backend->reset;
Reset job queue. Meant to be overloaded in a subclass.
retry_job
my $bool = $backend->retry_job($job_id, $retries);
my $bool = $backend->retry_job($job_id, $retries, {delay => 10});
Transition job back to "inactive" state, already "inactive" jobs may also be retried to change options.
Meant to be overloaded in a subclass.
These options are currently available:
attempts
attempts => 25
Number of times performing this job will be attempted.
delay
delay => 10
Delay job for this many seconds (from now), defaults to 0.
priority
priority => 5
Job priority.
queue
queue => 'important'
Queue to put job in.
stats
my $stats = $backend->stats;
Get statistics for jobs and workers. Meant to be overloaded in a subclass.
These fields are currently available:
active_jobs
active_jobs => 100
Number of jobs in "active" state.
active_workers
active_workers => 100
Number of workers that are currently processing a job.
delayed_jobs
delayed_jobs => 100
Number of jobs in "inactive" state that are scheduled to run at specific time in the future or have
unresolved dependencies. Note that this field is EXPERIMENTAL and might change without warning!
failed_jobs
failed_jobs => 100
Number of jobs in "failed" state.
finished_jobs
finished_jobs => 100
Number of jobs in "finished" state.
inactive_jobs
inactive_jobs => 100
Number of jobs in "inactive" state.
inactive_workers
inactive_workers => 100
Number of workers that are currently not processing a job.
unlock
my $bool = $backend->unlock('foo');
Release a named lock.
unregister_worker
$backend->unregister_worker($worker_id);
Unregister worker. Meant to be overloaded in a subclass.
worker_info
my $worker_info = $backend->worker_info($worker_id);
Get information about a worker, or return "undef" if worker does not exist. Meant to be overloaded in a
subclass.
# Check worker host
my $host = $backend->worker_info($worker_id)->{host};
These fields are currently available:
host
host => 'localhost'
Worker host.
jobs
jobs => ['10023', '10024', '10025', '10029']
Ids of jobs the worker is currently processing.
notified
notified => 784111777
Epoch time worker sent the last heartbeat.
pid
pid => 12345
Process id of worker.
started
started => 784111777
Epoch time worker was started.
status
status => {queues => ['default', 'important']}
Hash reference with whatever status information the worker would like to share.
SEE ALSO
Minion, Mojolicious::Guides, <http://mojolicious.org>.
perl v5.26.0 2017-08-14 Minion::Backend(3pm)