Module: SwitchmanInstJobs::Switchman::Shard

Defined in:
lib/switchman_inst_jobs/switchman/shard.rb

Defined Under Namespace

Modules: ClassMethods

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.prepended(base) ⇒ Object 



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# File 'lib/switchman_inst_jobs/switchman/shard.rb', line 4

def self.prepended(base)
  base.singleton_class.prepend(ClassMethods)
end

Instance Method Details

#clear_cache ⇒ Object 



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# File 'lib/switchman_inst_jobs/switchman/shard.rb', line 8

def clear_cache
  self.class.connection.after_transaction_commit { super }
end

#delayed_jobs_shard ⇒ Object 



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# File 'lib/switchman_inst_jobs/switchman/shard.rb', line 12

def delayed_jobs_shard
  if read_attribute(:delayed_jobs_shard_id)
    shard = ::Switchman::Shard.lookup(delayed_jobs_shard_id)
    return shard if shard
  end
  @delayed_jobs_shard ||= database_server&.delayed_jobs_shard(self)
end

#hold_jobs!(wait: false) ⇒ Object

Adapted from hold/unhold methods in base delayed jobs base Wait is required to be able to safely move jobs



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# File 'lib/switchman_inst_jobs/switchman/shard.rb', line 22

def hold_jobs!(wait: false)
  self.jobs_held = true
  save! if changed?
  delayed_jobs_shard.activate(::Delayed::Backend::ActiveRecord::AbstractJob) do
    lock_jobs_for_hold
  end
  return unless wait

  delayed_jobs_shard.activate(::Delayed::Backend::ActiveRecord::AbstractJob) do
    while ::Delayed::Job.where(shard_id: id).
        where.not(locked_at: nil).
        where.not(locked_by: ::Delayed::Backend::Base::ON_HOLD_LOCKED_BY).exists?
      sleep 10
      lock_jobs_for_hold
    end
  end
end

#unhold_jobs! ⇒ Object 



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# File 'lib/switchman_inst_jobs/switchman/shard.rb', line 40

def unhold_jobs!
  self.jobs_held = false
  if changed?
    save!
    # Wait a little over the 60 second in-process shard cache clearing
    # threshold to ensure that all new jobs are now being enqueued
    # unlocked
    Rails.logger.debug('Waiting for caches to clear')
    sleep(65)
  end
  delayed_jobs_shard.activate(::Delayed::Backend::ActiveRecord::AbstractJob) do
    ::Delayed::Job.where(locked_by: ::Delayed::Backend::Base::ON_HOLD_LOCKED_BY, shard_id: id).
      in_batches(of: 10_000).
      update_all(
        locked_by: nil,
        locked_at: nil,
        attempts: 0,
        failed_at: nil
      )
  end
end