debian-mirror-gitlab/lib/gitlab/graphql/lazy.rb
2021-03-08 18:12:59 +05:30

53 lines
1.2 KiB
Ruby

# frozen_string_literal: true
module Gitlab
module Graphql
class Lazy
include Gitlab::Utils::StrongMemoize
def initialize(&block)
@proc = block
end
def force
strong_memoize(:force) { self.class.force(@proc.call) }
end
def then(&block)
self.class.new { yield force }
end
def catch(error_class = StandardError, &block)
self.class.new do
force
rescue error_class => e
yield e
end
end
# Force evaluation of a (possibly) lazy value
def self.force(value)
case value
when ::Gitlab::Graphql::Lazy
value.force
when ::BatchLoader::GraphQL
value.sync
when ::Gitlab::Graphql::Deferred
value.execute
when ::GraphQL::Execution::Lazy
value.value # part of the private api, but we can force this as well
when ::Concurrent::Promise
value.execute if value.state == :unscheduled
value.value # value.value(10.seconds)
else
value
end
end
def self.with_value(unforced, &block)
self.new { unforced }.then(&block)
end
end
end
end