/ 
Minion-10.10
River stage two • 21 direct dependents • 30 total dependents
/ Minion::Backend

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 history           {...}
sub list_jobs         {...}
sub list_locks        {...}
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 {...}

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. Note that this attribute is weakened.

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. Meant to be overloaded in a subclass.

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.

sequence
sequence => 'host:mojolicious.org'

Sequence this job belongs to. The previous job from the sequence will be automatically added as a parent to continue the sequence. Note that this option is EXPERIMENTAL and might change without warning

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 with or without a result, 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 with or without a result. Meant to be overloaded in a subclass.

history

my $history = $backend->history;

Get history information for job queue. Meant to be overloaded in a subclass.

These fields are currently available:

daily
daily => [{epoch => 12345, finished_jobs => 95, failed_jobs => 2}, ...]

Hourly counts for processed jobs from the past day.

list_jobs

my $results = $backend->list_jobs($offset, $limit);
my $results = $backend->list_jobs($offset, $limit, {states => ['inactive']});

Returns the information about jobs in batches. Meant to be overloaded in a subclass.

# Get the total number of results (without limit)
my $num = $backend->list_jobs(0, 100, {queues => ['important']})->{total};

# Check job state
my $results = $backend->list_jobs(0, 1, {ids => [$job_id]});
my $state = $results->{jobs}[0]{state};

# Get job result
my $results = $backend->list_jobs(0, 1, {ids => [$job_id]});
my $result  = $results->{jobs}[0]{result};

These options are currently available:

before
before => 23

List only jobs before this id.

ids
ids => ['23', '24']

List only jobs with these ids.

notes
notes => ['foo', 'bar']

List only jobs with one of these notes. Note that this option is EXPERIMENTAL and might change without warning!

queues
queues => ['important', 'unimportant']

List only jobs in these queues.

sequences
sequences => ['host:localhost', 'host:mojolicious.org']

List only jobs from these sequences. Note that this option is EXPERIMENTAL and might change without warning!

states
states => ['inactive', 'active']

List only jobs in these states.

tasks
tasks => ['foo', 'bar']

List only jobs for these tasks.

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.

id
id => 10025

Job id.

next
next => 10024

Next job in sequence.

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.

previous
previous => 10022

Previous job in sequence.

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.

sequence
sequence => 'host:mojolicious.org'

Sequence name.

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.

time
time => 78411177

Server time.

worker
worker => '154'

Id of worker that is processing the job.

list_locks

my $results = $backend->list_locks($offset, $limit);
my $results = $backend->list_locks($offset, $limit, {names => ['foo']});

Returns information about locks in batches. Meant to be overloaded in a subclass.

# Get the total number of results (without limit)
my $num = $backend->list_locks(0, 100, {names => ['bar']})->{total};

# Check expiration time
my $results = $backend->list_locks(0, 1, {names => ['foo']});
my $expires = $results->{locks}[0]{expires};

These options are currently available:

names
names => ['foo', 'bar']

List only locks with these names.

These fields are currently available:

expires
expires => 784111777

Epoch time this lock will expire.

name
name => 'foo'

Lock name.

list_workers

my $results = $backend->list_workers($offset, $limit);
my $results = $backend->list_workers($offset, $limit, {ids => [23]});

Returns information about workers in batches. Meant to be overloaded in a subclass.

# Get the total number of results (without limit)
my $num = $backend->list_workers(0, 100)->{total};

# Check worker host
my $results = $backend->list_workers(0, 1, {ids => [$worker_id]});
my $host    = $results->{workers}[0]{host};

These options are currently available:

before
before => 23

List only workers before this id.

ids
ids => ['23', '24']

List only workers with these ids.

These fields are currently available:

id
id => 22

Worker id.

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.

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. An expiration time of 0 can be used to check if a named lock already exists without creating one. Meant to be overloaded in a subclass.

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

my $bool = $backend->note($job_id, {mojo => 'rocks', minion => 'too'});

Change one or more metadata fields for a job. Setting a value to undef will remove the field. Meant to be overloaded in a subclass.

receive

my $commands = $backend->receive($worker_id);

Receive remote control commands for worker. Meant to be overloaded in a subclass.

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({all => 1});

Reset job queue. Meant to be overloaded in a subclass.

These options are currently available:

all
all => 1

Reset everything.

locks
locks => 1

Reset only locks.

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.

parents
parents => [$id1, $id2, $id3]

Jobs this job depends on.

priority
priority => 5

Job priority.

queue
queue => 'important'

Queue to put job in.

stats

my $stats = $backend->stats;

Get statistics for the job queue. Meant to be overloaded in a subclass.

These fields are currently available:

active_jobs
active_jobs => 100

Number of jobs in active state.

active_locks
active_locks => 100

Number of active named locks.

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.

enqueued_jobs
enqueued_jobs => 100000

Rough estimate of how many jobs have ever been enqueued.

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.

uptime
uptime => 1000

Uptime in seconds.

unlock

my $bool = $backend->unlock('foo');

Release a named lock. Meant to be overloaded in a subclass.

unregister_worker

$backend->unregister_worker($worker_id);

Unregister worker. Meant to be overloaded in a subclass.

SEE ALSO

Minion, Mojolicious::Guides, https://mojolicious.org.