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# frozen_string_literal: true
module Gitlab
module Database
module Migrations
class BaseBackgroundRunner
attr_reader :result_dir
def initialize(result_dir:)
@result_dir = result_dir
end
def jobs_by_migration_name
raise NotImplementedError, 'subclass must implement'
end
def run_job(job)
raise NotImplementedError, 'subclass must implement'
end
def run_jobs(for_duration:)
jobs_to_run = jobs_by_migration_name
return if jobs_to_run.empty?
# without .to_f, we do integer division
# For example, 3.minutes / 2 == 1.minute whereas 3.minutes / 2.to_f == (1.minute + 30.seconds)
duration_per_migration_type = for_duration / jobs_to_run.count.to_f
jobs_to_run.each do |migration_name, jobs|
run_until = duration_per_migration_type.from_now
run_jobs_for_migration(migration_name: migration_name, jobs: jobs, run_until: run_until)
end
end
private
def run_jobs_for_migration(migration_name:, jobs:, run_until:)
per_background_migration_result_dir = File.join(@result_dir, migration_name)
instrumentation = Instrumentation.new(result_dir: per_background_migration_result_dir)
batch_names = (1..).each.lazy.map { |i| "batch_#{i}"}
jobs.shuffle.each do |j|
break if run_until <= Time.current
instrumentation.observe(version: nil,
name: batch_names.next,
connection: ActiveRecord::Migration.connection) do
run_job(j)
end
end
end
end
end
end
end
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