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111 lines
3.0 KiB
111 lines
3.0 KiB
#-- copyright
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# ReportingEngine
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#
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# Copyright (C) 2010 - 2014 the OpenProject Foundation (OPF)
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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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# version 3.
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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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#++
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require 'digest/sha1'
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class Widget::Base < Widget
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attr_reader :engine, :output
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##
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# Deactivate caching for certain widgets. If called on Widget::Base,
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# caching is deactivated globally
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def self.dont_cache!
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@dont_cache = true
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end
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##
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# Query whether this widget class should be cached.
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def self.dont_cache?
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@dont_cache or self != Widget::Base && Widget::Base.dont_cache?
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end
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def initialize(query)
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@subject = query
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@engine = query.class
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@options = {}
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end
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##
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# Write a string to the canvas. The string is marked as html_safe.
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# This will write twice, if @cache_output is set.
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def write(str)
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str ||= ''
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@output ||= ''.html_safe
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@output = @output + '' if @output.frozen? # Rails 2 freezes tag strings
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@output.concat str.html_safe
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@cache_output.concat(str.html_safe) if @cache_output
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str.html_safe
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end
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##
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# Render this widget. Abstract method. Needs to call #write at least once
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def render
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raise NotImplementedError, "#render is missing in my subclass #{self.class}"
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end
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##
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# Render this widget, passing options.
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# Available options:
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# :to => canvas - The canvas (streaming or otherwise) to render to. Has to respond to #write
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def render_with_options(options = {}, &block)
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set_canvas(options.delete(:to)) if options.has_key? :to
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@options = options
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render_with_cache(options, &block)
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@output
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end
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def cache_key
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@cache_key ||= Digest::SHA1::hexdigest begin
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if subject.respond_to? :cache_key
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"#{I18n.locale}/#{self.class.name.demodulize}/#{subject.cache_key}/#{@options.sort_by(&:to_s)}"
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else
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subject.inspect
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end
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end
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end
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def cached?
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cache? && Rails.cache.exist?(cache_key)
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end
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private
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def cache?
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!self.class.dont_cache?
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end
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##
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# Render this widget or serve it from cache
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def render_with_cache(_options = {}, &block)
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if cached?
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write Rails.cache.fetch(cache_key)
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else
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render(&block)
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Rails.cache.write(cache_key, @cache_output || @output) if cache?
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end
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end
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##
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# Set the canvas. If the canvas object isn't a string (e.g. cannot be cached easily),
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# a @cache_output String is created, that will mirror what is being written to the canvas.
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def set_canvas(canvas)
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@cache_output = ''.html_safe
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@output = canvas
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end
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end
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