Class: QC::Queue

Inherits:
Object
  • Object
show all
Defined in:
lib/queue_classic_plus/queue_classic/queue.rb

Instance Method Summary collapse

Instance Method Details

#enqueue_retry_in(seconds, method, remaining_retries, *args) ⇒ Object 



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# File 'lib/queue_classic_plus/queue_classic/queue.rb', line 4

def enqueue_retry_in(seconds, method, remaining_retries, *args)
  QC.log_yield(:measure => 'queue.enqueue') do
    s = "INSERT INTO #{QC.table_name} (q_name, method, args, scheduled_at, remaining_retries)
         VALUES ($1, $2, $3, now() + interval '#{seconds.to_i} seconds', $4)"

    conn_adapter.execute(s, name, method, JSON.dump(args), remaining_retries)
  end
end

#lock ⇒ Object 



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# File 'lib/queue_classic_plus/queue_classic/queue.rb', line 13

def lock
  QC.log_yield(:measure => 'queue.lock') do
    s = <<~SQL
      WITH selected_job AS (
        SELECT id
        FROM queue_classic_jobs
        WHERE
          locked_at IS NULL AND
          q_name = $1 AND
          scheduled_at <= now()
        LIMIT 1
        FOR NO KEY UPDATE SKIP LOCKED
      )
      UPDATE queue_classic_jobs
      SET
        locked_at = now(),
        locked_by = pg_backend_pid()
      FROM selected_job
      WHERE queue_classic_jobs.id = selected_job.id
      RETURNING *
    SQL

    if r = conn_adapter.execute(s, name)
      {}.tap do |job|
        job[:id] = r["id"]
        job[:q_name] = r["q_name"]
        job[:method] = r["method"]
        job[:args] = JSON.parse(r["args"])
        job[:remaining_retries] = r["remaining_retries"]&.to_s
        if r["scheduled_at"]
          # ActiveSupport may cast time strings to Time
          job[:scheduled_at] = r["scheduled_at"].kind_of?(Time) ? r["scheduled_at"] : Time.parse(r["scheduled_at"])
          ttl = Integer((Time.now - job[:scheduled_at]) * 1000)
          QC.measure("time-to-lock=#{ttl}ms source=#{name}")
        end
      end
    end
  end
end