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