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require 'thread'
module ActionController
class Reloader
@@default_lock = Mutex.new
cattr_accessor :default_lock
class BodyWrapper
def initialize(body, lock)
@body = body
@lock = lock
end
def close
@body.close if @body.respond_to?(:close)
ensure
Dispatcher.cleanup_application
@lock.unlock
end
def method_missing(*args, &block)
@body.send(*args, &block)
end
def respond_to?(symbol, include_private = false)
symbol == :close || @body.respond_to?(symbol, include_private)
end
end
def self.run(lock = @@default_lock)
lock.lock
begin
Dispatcher.reload_application
status, headers, body = yield
# We do not want to call 'cleanup_application' in an ensure block
# because the returned Rack response body may lazily generate its data. This
# is for example the case if one calls
#
# render :text => lambda { ... code here which refers to application models ... }
#
# in an ActionController.
#
# Instead, we will want to cleanup the application code after the request is
# completely finished. So we wrap the body in a BodyWrapper class so that
# when the Rack handler calls #close during the end of the request, we get to
# run our cleanup code.
[status, headers, BodyWrapper.new(body, lock)]
rescue Exception
lock.unlock
raise
end
end
end
end
|
