NAME
Minion::Backend::SQLite - SQLite backend for Minion job queue
SYNOPSIS
use Minion::Backend::SQLite;
my $backend = Minion::Backend::SQLite->new('sqlite:test.db');
# Minion
use Minion;
my $minion = Minion->new(SQLite => 'sqlite:test.db');
# Mojolicious (via Mojolicious::Plugin::Minion)
$self->plugin(Minion => { SQLite => 'sqlite:test.db' });
# Mojolicious::Lite (via Mojolicious::Plugin::Minion)
plugin Minion => { SQLite => 'sqlite:test.db' };
# Share the database connection cache
helper sqlite => sub { state $sqlite = Mojo::SQLite->new('sqlite:test.db') };
plugin Minion => { SQLite => app->sqlite };
DESCRIPTION
Minion::Backend::SQLite is a backend for Minion based on Mojo::SQLite.
All necessary tables will be created automatically with a set of
migrations named minion. If no connection string or :temp: is provided,
the database will be created in a temporary directory.
ATTRIBUTES
Minion::Backend::SQLite inherits all attributes from Minion::Backend
and implements the following new ones.
dequeue_interval
my $seconds = $backend->dequeue_interval;
$backend = $backend->dequeue_interval($seconds);
Interval in seconds between "dequeue" attempts. Defaults to 0.5.
sqlite
my $sqlite = $backend->sqlite;
$backend = $backend->sqlite(Mojo::SQLite->new);
Mojo::SQLite object used to store all data.
METHODS
Minion::Backend::SQLite inherits all methods from Minion::Backend and
implements the following new ones.
new
my $backend = Minion::Backend::SQLite->new;
my $backend = Minion::Backend::SQLite->new(':temp:');
my $backend = Minion::Backend::SQLite->new('sqlite:test.db');
my $backend = Minion::Backend::SQLite->new->tap(sub { $_->sqlite->from_filename('C:\\foo\\bar.db') });
my $backend = Minion::Backend::SQLite->new(Mojo::SQLite->new);
Construct a new Minion::Backend::SQLite object.
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. Jobs will be checked for in intervals defined by
"dequeue_interval" until the timeout is reached.
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 = $backend->enqueue(foo => [@args] => {priority => 1});
Enqueue a new job with inactive state.
These options are currently available:
attempts
attempts => 25
Number of times performing this job will be attempted, with a delay
based on "backoff" in Minion after the first attempt, defaults to 1.
delay
delay => 10
Delay job for this many seconds (from now).
notes
notes => {foo => 'bar', baz => [1, 2, 3]}
Hash reference with arbitrary metadata for this job.
parents
parents => [$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, {msg => 'Something went wrong!'});
Transition from active to failed state, and if there are attempts
remaining, transition back to inactive with an exponentially increasing
delay based on "backoff" in Minion.
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, {msg => 'All went well!'});
Transition from active to finished state.
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.
# 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:
ids
ids => ['23', '24']
List only jobs with these ids.
queues
queue => ['important', 'unimportant']
List only jobs in these queues.
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.
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_locks
my $results = $backend->list_locks($offset, $limit);
my $results = $backend->list_locks($offset, $limit, {names => ['foo']});
Returns information about locks in batches.
# 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.
# Check worker host
my $results = $backend->list_workers(0, 1, {ids => [$worker_id]});
my $host = $results->{workers}[0]{host};
These options are currently available:
ids
ids => ['23', '24']
List only workers with these ids.
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.
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.
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. It is currently an error
to attempt to set a metadata field with a name containing the
characters ., [, or ].
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.
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.
repair
$backend->repair;
Repair worker registry and job queue if necessary.
reset
$backend->reset;
Reset job queue.
retry_job
my $bool = $backend->retry_job($job_id, $retries);
my $bool = $backend->retry_job($job_id, $retries, {delay => 10});
Transition job back to inactive state, already inactive jobs may also
be retried to change options.
These options are currently available:
attempts
attempts => 25
Number of times performing this job will be attempted.
delay
delay => 10
Delay job for this many seconds (from now).
parents
parents => [$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.
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. Note that this field is EXPERIMENTAL and
might change without warning!
enqueued_jobs
enqueued_jobs => 100000
Rough estimate of how many jobs have ever been enqueued. 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.
uptime
uptime => undef
Uptime in seconds. Always undefined for SQLite.
unlock
my $bool = $backend->unlock('foo');
Release a named lock.
unregister_worker
$backend->unregister_worker($worker_id);
Unregister worker.
BUGS
Report any issues on the public bugtracker.
AUTHOR
Dan Book <dbook@cpan.org>
COPYRIGHT AND LICENSE
This software is Copyright (c) 2015 by Dan Book.
This is free software, licensed under:
The Artistic License 2.0 (GPL Compatible)
SEE ALSO
Minion, Mojo::SQLite