class MiniSql::Sqlite::DeserializerCache
Constants
- DEFAULT_MAX_SIZE
Public Class Methods
new(max_size = nil)
click to toggle source
# File lib/mini_sql/sqlite/deserializer_cache.rb, line 9 def initialize(max_size = nil) @cache = {} @max_size = max_size || DEFAULT_MAX_SIZE end
Public Instance Methods
materialize(result, decorator_module = nil)
click to toggle source
# File lib/mini_sql/sqlite/deserializer_cache.rb, line 14 def materialize(result, decorator_module = nil) key = result.columns.join(',') # trivial fast LRU implementation materializer = @cache.delete(key) if materializer @cache[key] = materializer else materializer = @cache[key] = new_row_materializer(result) @cache.shift if @cache.length > @max_size end if decorator_module materializer = materializer.decorated(decorator_module) end r = [] # quicker loop while !result.eof? data = result.next if data r << materializer.materialize(data) end end r end
Private Instance Methods
new_row_materializer(result)
click to toggle source
# File lib/mini_sql/sqlite/deserializer_cache.rb, line 44 def new_row_materializer(result) fields = result.columns Class.new do extend MiniSql::Decoratable include MiniSql::Result attr_accessor(*fields) instance_eval <<~RUBY def materialize(data) r = self.new #{col = -1; fields.map { |f| "r.#{f} = data[#{col += 1}]" }.join("; ")} r end RUBY end end