Class: Delayed::Backend::ActiveRecord::Job
- Inherits:
-
ActiveRecord::Base
- Object
- ActiveRecord::Base
- Delayed::Backend::ActiveRecord::Job
show all
- Includes:
- Base
- Defined in:
- lib/delayed/backend/active_record.rb
Overview
A job object that is persisted to the database. Contains the work object as a YAML field.
Direct Known Subclasses
Failed
Defined Under Namespace
Classes: Failed
Constant Summary
Constants included
from Base
Base::ON_HOLD_COUNT, Base::ON_HOLD_LOCKED_BY
Class Method Summary
collapse
-
.all_available(queue = Delayed::Settings.queue, min_priority = nil, max_priority = nil) ⇒ Object
-
.bulk_update(action, opts) ⇒ Object
perform a bulk update of a set of jobs action is :hold, :unhold, or :destroy to specify the jobs to act on, either pass opts = [list of job ids] or opts = <some flavor> to perform on all jobs of that flavor.
-
.by_priority ⇒ Object
-
.clear_locks!(worker_name) ⇒ Object
When a worker is exiting, make sure we don’t have any locked jobs.
-
.create_singleton(options) ⇒ Object
Create the job on the specified strand, but only if there aren’t any other non-running jobs on that strand.
-
.current ⇒ Object
-
.failed ⇒ Object
-
.find_available(limit, queue = Delayed::Settings.queue, min_priority = nil, max_priority = nil) ⇒ Object
-
.future ⇒ Object
-
.get_and_lock_next_available(worker_name, queue = Delayed::Settings.queue, min_priority = nil, max_priority = nil) ⇒ Object
-
.jobs_count(flavor, query = nil) ⇒ Object
get the total job count for the given flavor see list_jobs for documentation on arguments.
-
.list_jobs(flavor, limit, offset = 0, query = nil) ⇒ Object
get a list of jobs of the given flavor in the given queue flavor is :current, :future, :failed, :strand or :tag depending on the flavor, query has a different meaning: for :current and :future, it’s the queue name (defaults to Delayed::Settings.queue) for :strand it’s the strand name for :tag it’s the tag name for :failed it’s ignored.
-
.maybe_silence_periodic_log(&block) ⇒ Object
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.n_strand_options(strand_name, num_strands) ⇒ Object
This overwrites the previous behavior so rather than changing the strand and balancing at queue time, this keeps the strand intact and uses triggers to limit the number running.
-
.ready_to_run ⇒ Object
a nice stress test: 10_000.times { |i| Kernel.send_later_enqueue_args(:system, { :strand => ‘s1’, :run_at => (24.hours.ago + (rand(24.hours.to_i))) }, “echo #i >> test1.txt”) } 500.times { |i| “ohai”.send_later_enqueue_args(:reverse, { :run_at => (12.hours.ago + (rand(24.hours.to_i))) }) } then fire up your workers you can check out strand correctness: diff test1.txt <(sort -n test1.txt).
-
.reconnect! ⇒ Object
-
.running ⇒ Object
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.running_jobs ⇒ Object
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.scope_for_flavor(flavor, query) ⇒ Object
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.strand_size(strand) ⇒ Object
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.tag_counts(flavor, limit, offset = 0) ⇒ Object
returns a list of hashes { :tag => tag_name, :count => current_count } in descending count order flavor is :current or :all.
-
.transaction_for_singleton(strand) ⇒ Object
used internally by create_singleton to take the appropriate lock depending on the db driver.
Instance Method Summary
collapse
Methods included from Base
#batch?, #expired?, #failed?, #full_name, #hold!, included, #initialize_defaults, #invoke_job, #locked?, #name, #on_hold?, #payload_object, #payload_object=, #permanent_failure, #reschedule, #reschedule_at, #unhold!, #unlock
Class Method Details
.all_available(queue = Delayed::Settings.queue, min_priority = nil, max_priority = nil) ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 231
def self.all_available(queue = Delayed::Settings.queue,
min_priority = nil,
max_priority = nil)
min_priority ||= Delayed::MIN_PRIORITY
max_priority ||= Delayed::MAX_PRIORITY
check_queue(queue)
check_priorities(min_priority, max_priority)
self.ready_to_run.
where(:priority => min_priority..max_priority, :queue => queue).
by_priority
end
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.bulk_update(action, opts) ⇒ Object
perform a bulk update of a set of jobs action is :hold, :unhold, or :destroy to specify the jobs to act on, either pass opts = [list of job ids] or opts = <some flavor> to perform on all jobs of that flavor
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# File 'lib/delayed/backend/active_record.rb', line 146
def self.bulk_update(action, opts)
raise("Can't #{action.to_s} failed jobs") if opts[:flavor].to_s == 'failed' && action.to_s != 'destroy'
scope = if opts[:ids]
if opts[:flavor] == 'failed'
Delayed::Job::Failed.where(:id => opts[:ids])
else
self.where(:id => opts[:ids])
end
elsif opts[:flavor]
self.scope_for_flavor(opts[:flavor], opts[:query])
end
return 0 unless scope
case action.to_s
when 'hold'
scope = scope.where(locked_by: nil)
scope.update_all(:locked_by => ON_HOLD_LOCKED_BY, :locked_at => db_time_now, :attempts => ON_HOLD_COUNT)
when 'unhold'
now = db_time_now
scope = scope.where(locked_by: ON_HOLD_LOCKED_BY)
scope.update_all(["locked_by = NULL, locked_at = NULL, attempts = 0, run_at = (CASE WHEN run_at > ? THEN run_at ELSE ? END), failed_at = NULL", now, now])
when 'destroy'
scope = scope.where("locked_by IS NULL OR locked_by=?", ON_HOLD_LOCKED_BY) unless opts[:flavor] == 'failed'
scope.delete_all
end
end
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.by_priority ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 77
def self.by_priority
order("priority ASC, run_at ASC")
end
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.clear_locks!(worker_name) ⇒ Object
When a worker is exiting, make sure we don’t have any locked jobs.
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# File 'lib/delayed/backend/active_record.rb', line 82
def self.clear_locks!(worker_name)
where(:locked_by => worker_name).update_all(:locked_by => nil, :locked_at => nil)
end
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.create_singleton(options) ⇒ Object
Create the job on the specified strand, but only if there aren’t any other non-running jobs on that strand. (in other words, the job will still be created if there’s another job on the strand but it’s already running)
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# File 'lib/delayed/backend/active_record.rb', line 258
def self.create_singleton(options)
strand = options[:strand]
transaction_for_singleton(strand) do
job = self.where(:strand => strand, :locked_at => nil).order(:id).first
new_job = new(options)
if job
new_job.initialize_defaults
job.run_at = [job.run_at, new_job.run_at].min
job.save! if job.changed?
else
new_job.save!
end
job || new_job
end
end
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.current ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 53
def self.current
where("run_at<=?", db_time_now)
end
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.failed ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 61
def self.failed
where("failed_at IS NOT NULL")
end
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.find_available(limit, queue = Delayed::Settings.queue, min_priority = nil, max_priority = nil) ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 224
def self.find_available(limit,
queue = Delayed::Settings.queue,
min_priority = nil,
max_priority = nil)
all_available(queue, min_priority, max_priority).limit(limit).to_a
end
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.future ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 57
def self.future
where("run_at>?", db_time_now)
end
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.get_and_lock_next_available(worker_name, queue = Delayed::Settings.queue, min_priority = nil, max_priority = nil) ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 201
def self.get_and_lock_next_available(worker_name,
queue = Delayed::Settings.queue,
min_priority = nil,
max_priority = nil)
check_queue(queue)
check_priorities(min_priority, max_priority)
loop do
jobs = maybe_silence_periodic_log do
find_available(Settings.fetch_batch_size, queue, min_priority, max_priority)
end
return nil if jobs.empty?
if Settings.select_random_from_batch
jobs = jobs.sort_by { rand }
end
job = jobs.detect do |job|
job.send(:lock_exclusively!, worker_name)
end
return job if job
end
end
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.jobs_count(flavor, query = nil) ⇒ Object
get the total job count for the given flavor see list_jobs for documentation on arguments
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# File 'lib/delayed/backend/active_record.rb', line 136
def self.jobs_count(flavor,
query = nil)
scope = self.scope_for_flavor(flavor, query)
scope.count
end
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.list_jobs(flavor, limit, offset = 0, query = nil) ⇒ Object
get a list of jobs of the given flavor in the given queue flavor is :current, :future, :failed, :strand or :tag depending on the flavor, query has a different meaning: for :current and :future, it’s the queue name (defaults to Delayed::Settings.queue) for :strand it’s the strand name for :tag it’s the tag name for :failed it’s ignored
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# File 'lib/delayed/backend/active_record.rb', line 125
def self.list_jobs(flavor,
limit,
offset = 0,
query = nil)
scope = self.scope_for_flavor(flavor, query)
order = flavor.to_s == 'future' ? 'run_at' : 'id desc'
scope.order(order).limit(limit).offset(offset).to_a
end
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.maybe_silence_periodic_log(&block) ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 193
def self.maybe_silence_periodic_log(&block)
if Settings.silence_periodic_log
::ActiveRecord::Base.logger.silence(&block)
else
block.call
end
end
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.n_strand_options(strand_name, num_strands) ⇒ Object
This overwrites the previous behavior so rather than changing the strand and balancing at queue time, this keeps the strand intact and uses triggers to limit the number running
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# File 'lib/delayed/backend/active_record.rb', line 49
def self.n_strand_options(strand_name, num_strands)
{:strand => strand_name, :max_concurrent => num_strands}
end
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.ready_to_run ⇒ Object
a nice stress test: 10_000.times { |i| Kernel.send_later_enqueue_args(:system, { :strand => ‘s1’, :run_at => (24.hours.ago + (rand(24.hours.to_i))) }, “echo #i >> test1.txt”) } 500.times { |i| “ohai”.send_later_enqueue_args(:reverse, { :run_at => (12.hours.ago + (rand(24.hours.to_i))) }) } then fire up your workers you can check out strand correctness: diff test1.txt <(sort -n test1.txt)
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# File 'lib/delayed/backend/active_record.rb', line 74
def self.ready_to_run
where("run_at<=? AND locked_at IS NULL AND next_in_strand=?", db_time_now, true)
end
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.reconnect! ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 20
def self.reconnect!
clear_all_connections!
end
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.running ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 65
def self.running
where("locked_at IS NOT NULL AND locked_by<>'on hold'")
end
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.running_jobs ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 90
def self.running_jobs()
self.running.order(:locked_at)
end
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.scope_for_flavor(flavor, query) ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 94
def self.scope_for_flavor(flavor, query)
scope = case flavor.to_s
when 'current'
self.current
when 'future'
self.future
when 'failed'
Delayed::Job::Failed
when 'strand'
self.where(:strand => query)
when 'tag'
self.where(:tag => query)
else
raise ArgumentError, "invalid flavor: #{flavor.inspect}"
end
if %w(current future).include?(flavor.to_s)
queue = query.presence || Delayed::Settings.queue
scope = scope.where(:queue => queue)
end
scope
end
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.strand_size(strand) ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 86
def self.strand_size(strand)
self.where(:strand => strand).count
end
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.tag_counts(flavor, limit, offset = 0) ⇒ Object
returns a list of hashes { :tag => tag_name, :count => current_count } in descending count order flavor is :current or :all
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# File 'lib/delayed/backend/active_record.rb', line 178
def self.tag_counts(flavor,
limit,
offset = 0)
raise(ArgumentError, "invalid flavor: #{flavor}") unless %w(current all).include?(flavor.to_s)
scope = case flavor.to_s
when 'current'
self.current
when 'all'
self
end
scope = scope.group(:tag).offset(offset).limit(limit)
scope.order("COUNT(tag) DESC").count.map { |t,c| { :tag => t, :count => c } }
end
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.transaction_for_singleton(strand) ⇒ Object
used internally by create_singleton to take the appropriate lock depending on the db driver
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# File 'lib/delayed/backend/active_record.rb', line 247
def self.transaction_for_singleton(strand)
self.transaction do
connection.execute(sanitize_sql(["SELECT pg_advisory_xact_lock(#{connection.quote_table_name('half_md5_as_bigint')}(?))", strand]))
yield
end
end
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Instance Method Details
#create_and_lock!(worker) ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 306
def create_and_lock!(worker)
raise "job already exists" unless new_record?
self.locked_at = Delayed::Job.db_time_now
self.locked_by = worker
save!
end
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#fail! ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 313
def fail!
attrs = self.attributes
attrs['original_job_id'] = attrs.delete('id')
attrs['failed_at'] ||= self.class.db_time_now
attrs.delete('next_in_strand')
attrs.delete('max_concurrent')
self.class.transaction do
failed_job = Failed.create(attrs)
self.destroy
failed_job
end
rescue
self.destroy
raise
end
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#lock_strand_on_create ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 40
def lock_strand_on_create
if strand.present?
self.class.connection.execute("SELECT pg_advisory_xact_lock(#{self.class.connection.quote_table_name('half_md5_as_bigint')}(#{self.class.sanitize(strand)}))")
end
end
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