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# frozen_string_literal: true
module Ci
class ResourceGroup < ApplicationRecord
extend Gitlab::Ci::Model
belongs_to :project, inverse_of: :resource_groups
has_many :resources, class_name: 'Ci::Resource', inverse_of: :resource_group
has_many :builds, class_name: 'Ci::Build', inverse_of: :resource_group
validates :key,
length: { maximum: 255 },
format: { with: Gitlab::Regex.environment_name_regex,
message: Gitlab::Regex.environment_name_regex_message }
before_create :ensure_resource
##
# NOTE: This is concurrency-safe method that the subquery in the `UPDATE`
# works as explicit locking.
def assign_resource_to(build)
resources.free.limit(1).update_all(build_id: build.id) > 0
end
def release_resource_from(build)
resources.retained_by(build).update_all(build_id: nil) > 0
end
private
def ensure_resource
# Currently we only support one resource per group, which means
# maximum one build can be set to the resource group, thus builds
# belong to the same resource group are executed once at time.
self.resources.build if self.resources.empty?
end
end
end
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