discourse/lib/freedom_patches/rails6.rb

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# frozen_string_literal: true
# see: https://github.com/rails/rails/pull/36949#issuecomment-530698779
#
# Without this patch each time we close a DB connection we spin a thread
module ::ActiveRecord
module ConnectionAdapters
class AbstractAdapter
class StaticThreadLocalVar
attr_reader :value
def initialize(value)
@value = value
end
def bind(value)
raise "attempting to change immutable local var" if value != @value
if block_given?
yield
end
end
end
# we have no choice but to perform an aggressive patch here
# if we simply hook the method we will still call a finalizer
# on Concurrent::ThreadLocalVar
def initialize(connection, logger = nil, config = {}) # :nodoc:
super()
@connection = connection
@owner = nil
@instrumenter = ActiveSupport::Notifications.instrumenter
@logger = logger
@config = config
@pool = ActiveRecord::ConnectionAdapters::NullPool.new
@idle_since = Concurrent.monotonic_time
@visitor = arel_visitor
@statements = build_statement_pool
@lock = ActiveSupport::Concurrency::LoadInterlockAwareMonitor.new
if self.class.type_cast_config_to_boolean(config.fetch(:prepared_statements) { true })
@prepared_statement_status = Concurrent::ThreadLocalVar.new(true)
@visitor.extend(DetermineIfPreparableVisitor)
else
#@prepared_statement_status = Concurrent::ThreadLocalVar.new(false)
@prepared_statement_status = StaticThreadLocalVar.new(false)
end
@advisory_locks_enabled = self.class.type_cast_config_to_boolean(
config.fetch(:advisory_locks, true)
)
end
end
end
end