6bdc13b33d
Once the values are cached, only one database query is done at each user request (to check if the cache is still valid). git-svn-id: http://redmine.rubyforge.org/svn/trunk@685 e93f8b46-1217-0410-a6f0-8f06a7374b81
87 lines
2.9 KiB
Ruby
87 lines
2.9 KiB
Ruby
# redMine - project management software
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# Copyright (C) 2006-2007 Jean-Philippe Lang
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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class Setting < ActiveRecord::Base
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cattr_accessor :available_settings
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@@available_settings = YAML::load(File.open("#{RAILS_ROOT}/config/settings.yml"))
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validates_uniqueness_of :name
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validates_inclusion_of :name, :in => @@available_settings.keys
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validates_numericality_of :value, :only_integer => true, :if => Proc.new { |setting| @@available_settings[setting.name]['format'] == 'int' }
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# Hash used to cache setting values
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@cached_settings = {}
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@cached_cleared_on = Time.now
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# Returns the value of the setting named name
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def self.[](name)
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value = @cached_settings[name]
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value ? value : (@cached_settings[name] = find_or_default(name).value)
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end
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def self.[]=(name, value)
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setting = find_or_default(name)
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setting.value = (value ? value.to_s : "")
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@cached_settings[name] = nil
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setting.save
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setting.value
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end
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# Defines getter and setter for each setting
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# Then setting values can be read using: Setting.some_setting_name
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# or set using Setting.some_setting_name = "some value"
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@@available_settings.each do |name, params|
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src = <<-END_SRC
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def self.#{name}
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self[:#{name}]
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end
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def self.#{name}?
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self[:#{name}].to_i > 0
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end
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def self.#{name}=(value)
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self[:#{name}] = value
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end
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END_SRC
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class_eval src, __FILE__, __LINE__
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end
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# Checks if settings have changed since the values were read
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# and clears the cache hash if it's the case
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# Called once per request
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def self.check_cache
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settings_updated_on = Setting.maximum(:updated_on)
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if settings_updated_on && @cached_cleared_on <= settings_updated_on
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@cached_settings.clear
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@cached_cleared_on = Time.now
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logger.info "Settings cache cleared." if logger
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end
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end
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private
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# Returns the Setting instance for the setting named name
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# (record found in database or new record with default value)
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def self.find_or_default(name)
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name = name.to_s
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raise "There's no setting named #{name}" unless @@available_settings.has_key?(name)
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setting = find_by_name(name)
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setting ||= new(:name => name, :value => @@available_settings[name]['default']) if @@available_settings.has_key? name
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end
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end
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