Class: ActiveRecord::Materialized::ReadRouter Private

Inherits:
Object
  • Object
show all
Defined in:
lib/activerecord/materialized/read_router.rb

Overview

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

Routes a read to the cache table or to the cold-read fallback (populate-on-read for keyed reads), emitting the read instrumentation event for whichever path it serves.

Instance Method Summary collapse

Constructor Details

#initialize(view_class) ⇒ ReadRouter

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns a new instance of ReadRouter.



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# File 'lib/activerecord/materialized/read_router.rb', line 11

def initialize(view_class)
  @view_class = view_class
end

Instance Method Details

#partition_scope(args) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Per-partition fast path for keyed reads: serve fresh partitions from the cache, otherwise read through and enqueue maintenance (populate-on-read).



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# File 'lib/activerecord/materialized/read_router.rb', line 22

def partition_scope(args)
  return cache if @view_class.materialized?

  keys = PartitionState.keys_from(@view_class, args)
  return cold if keys.nil?
  return cache if PartitionState.new(@view_class).all_fresh?(keys)

  enqueue_partition_maintenance(keys)
  cold
end

#scope ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Routing for reads with no partition predicate to exploit.



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# File 'lib/activerecord/materialized/read_router.rb', line 16

def scope
  @view_class.materialized? ? cache : cold
end