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module ActionView #:nodoc:
class ReloadableTemplate < Template
class TemplateDeleted < ActionView::ActionViewError
end
class ReloadablePath < Template::Path
def initialize(path)
super
@paths = {}
new_request!
end
def new_request!
@disk_cache = {}
end
alias_method :load!, :new_request!
def [](path)
if found_template = @paths[path]
begin
found_template.reset_cache_if_stale!
rescue TemplateDeleted
unregister_template(found_template)
self[path]
end
else
load_all_templates_from_dir(templates_dir_from_path(path))
@paths[path]
end
end
def register_template_from_file(template_file_path)
if !@paths[template_relative_path = template_file_path.split("#{@path}/").last] && File.file?(template_file_path)
register_template(ReloadableTemplate.new(template_relative_path, self))
end
end
def register_template(template)
template.accessible_paths.each do |path|
@paths[path] = template
end
end
# remove (probably deleted) template from cache
def unregister_template(template)
template.accessible_paths.each do |template_path|
@paths.delete(template_path) if @paths[template_path] == template
end
# fill in any newly created gaps
@paths.values.uniq.each do |template|
template.accessible_paths.each {|path| @paths[path] ||= template}
end
end
# load all templates from the directory of the requested template
def load_all_templates_from_dir(dir)
# hit disk only once per template-dir/request
@disk_cache[dir] ||= template_files_from_dir(dir).each {|template_file| register_template_from_file(template_file)}
end
def templates_dir_from_path(path)
dirname = File.dirname(path)
File.join(@path, dirname == '.' ? '' : dirname)
end
# get all the template filenames from the dir
def template_files_from_dir(dir)
Dir.glob(File.join(dir, '*'))
end
end
module Unfreezable
def freeze; self; end
end
def initialize(*args)
super
@compiled_methods = []
# we don't ever want to get frozen
extend Unfreezable
end
def mtime
File.mtime(filename)
end
attr_accessor :previously_last_modified
def stale?
previously_last_modified.nil? || previously_last_modified < mtime
rescue Errno::ENOENT => e
undef_my_compiled_methods!
raise TemplateDeleted
end
def reset_cache_if_stale!
if stale?
flush_cache 'source', 'compiled_source'
undef_my_compiled_methods!
@previously_last_modified = mtime
end
self
end
def undef_my_compiled_methods!
@compiled_methods.each {|comp_method| ActionView::Base::CompiledTemplates.send(:remove_method, comp_method)}
@compiled_methods.clear
end
def compile!(render_symbol, local_assigns)
super
@compiled_methods << render_symbol
end
end
end
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