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.

    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, {msg => '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 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 with or without a result.

 history

      my $history = $backend->history;

    Get history information for job queue.

    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.

      # 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.

    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

      Current 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.

      # 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.

      # 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.

    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. 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({all => 1});

    Reset job queue.

    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.

    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.

    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 => 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