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# frozen-string-literal: true
module Sequel
module Plugins
# The static_cache_cache plugin allows for caching the row content for subclasses
# that use the static cache plugin (or just the current class). Using this plugin
# can avoid the need to query the database every time loading the plugin into a
# model, which can save time when you have a lot of models using the static_cache
# plugin.
#
# Usage:
#
# # Make all model subclasses that use the static_cache plugin use
# # the cached values in the given file
# Sequel::Model.plugin :static_cache_cache, "static_cache.cache"
#
# # Make the AlbumType model the cached values in the given file,
# # should be loaded before the static_cache plugin
# AlbumType.plugin :static_cache_cache, "static_cache.cache"
module StaticCacheCache
def self.configure(model, file)
model.instance_variable_set(:@static_cache_cache_file, file)
model.instance_variable_set(:@static_cache_cache, File.exist?(file) ? Marshal.load(File.read(file)) : {})
end
module ClassMethods
# Dump the in-memory cached rows to the cache file.
def dump_static_cache_cache
File.open(@static_cache_cache_file, 'wb'){|f| f.write(Marshal.dump(@static_cache_cache))}
nil
end
Plugins.inherited_instance_variables(self, :@static_cache_cache_file=>nil, :@static_cache_cache=>nil)
private
# Load the rows for the model from the cache if available.
# If not available, load the rows from the database, and
# then update the cache with the raw rows.
def load_static_cache_rows
if rows = Sequel.synchronize{@static_cache_cache[name]}
rows.map{|row| call(row)}.freeze
else
rows = dataset.all.freeze
raw_rows = rows.map(&:values)
Sequel.synchronize{@static_cache_cache[name] = raw_rows}
rows
end
end
end
end
end
end
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