discourse/lib/distributed_cache.rb

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# frozen_string_literal: true
require "message_bus/distributed_cache"
class DistributedCache < MessageBus::DistributedCache
def initialize(key, manager: nil, namespace: true)
super(key, manager: manager, namespace: namespace, app_version: Discourse.git_version)
end
# Defer setting of the key in the cache for performance critical path to avoid
# waiting on MessageBus to publish the message which involves writing to Redis.
def defer_set(k, v)
Scheduler::Defer.later("#{@key}_set") { self[k] = v }
end
def defer_get_set(k, &block)
return self[k] if hash.key? k
value = block.call
self.defer_set(k, value)
value
end
def defer_get_set_bulk(ks, key_blk, &blk)
found_keys, missing_keys = ks.partition { |k| hash.key?(key_blk.call(k)) }
found_hash = found_keys.map { |key| [key, self[key_blk.call(key)]] }.to_h
if missing_keys.present?
missing_values = blk.call(missing_keys.freeze)
missing_hash = missing_keys.zip(missing_values).to_h
Scheduler::Defer.later("#{@key}_bulk_set") do
missing_hash.each { |key, value| self[key_blk.call(key)] = value }
end
ks.zip(missing_hash.merge(found_hash).values_at(*ks)).to_h
else
found_hash
end
end
def clear(after_commit: true)
if after_commit && !GlobalSetting.skip_db?
DB.after_commit { super() }
else
super()
end
end
end