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015051ecaf
This is a temporary workaround for the issue in https://github.com/rails/rails/pull/36949 Discussing a proper fix in Rails with the Rails team. Prior to this fix we were spinning up a thread every time we closed a connection to the db.
51 lines
1.6 KiB
Ruby
51 lines
1.6 KiB
Ruby
# frozen_string_literal: true
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# see: https://github.com/rails/rails/pull/36949#issuecomment-530698779
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#
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# Without this patch each time we close a DB connection we spin a thread
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class ::ActiveRecord::ConnectionAdapters::AbstractAdapter
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class StaticThreadLocalVar
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attr_reader :value
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def initialize(value)
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@value = value
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end
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def bind(value)
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raise "attempting to change immutable local var" if value != @value
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end
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end
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# we have no choice but to perform an aggressive patch here
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# if we simply hook the method we will still call a finalizer
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# on Concurrent::ThreadLocalVar
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def initialize(connection, logger = nil, config = {}) # :nodoc:
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super()
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@connection = connection
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@owner = nil
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@instrumenter = ActiveSupport::Notifications.instrumenter
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@logger = logger
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@config = config
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@pool = ActiveRecord::ConnectionAdapters::NullPool.new
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@idle_since = Concurrent.monotonic_time
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@visitor = arel_visitor
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@statements = build_statement_pool
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@lock = ActiveSupport::Concurrency::LoadInterlockAwareMonitor.new
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if self.class.type_cast_config_to_boolean(config.fetch(:prepared_statements) { true })
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@prepared_statement_status = Concurrent::ThreadLocalVar.new(true)
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@visitor.extend(DetermineIfPreparableVisitor)
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else
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@prepared_statement_status = StaticThreadLocalVar.new(false)
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end
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@advisory_locks_enabled = self.class.type_cast_config_to_boolean(
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config.fetch(:advisory_locks, true)
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)
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end
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end
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