Richard Jones RJ

Notifications from Resources "Bubble Up"

Release in Chef 12.9.41 via PR #4741 core chef now has a feature which has been available in Poise for awhile, which is that notifications from within resources will now notify resources in outer run contexts. This means you can write a recipe with a service resource and send a notification to it from a resource that you write.

Notifications will bubble up from arbitrarily nested resources, so users that write resources that wrap resources which wrap your resource will still find the service resource in your default recipe.

At the same time the resources collection #find() and #lookup methods and the more commonly-used DSL method resources("service[ntpd]") has been changed to also match

What is the difference between Cerebral and Redux?

Cerebral and Redux were built to solve different problems

Redux was developed to achieve hot reloading global state and state changing logic. To achieve that it was necessary for state changes to be run with pure functions and the state has to be immutable. Now you can change the logic inside your reducer and when the application reloads Redux will put it in its initial state and rerun all the actions again, now running with the new state changing logic.

Cerebral had no intention of achieving hot reloading. Cerebral was initially developed to give you insight into how your application changes its state, using a debugger. In the Redux debugger you see what actions are triggered and how your state looks after the action was handled. In Cerebral you see all actions fired as part of a signal. You see asynchronous behaviour, paths taken based on decisions made in your state changing flow. You see all inputs and outputs produced during the flow and you even

Better local require() paths for Node.js

Problem

When the directory structure of your Node.js application (not library!) has some depth, you end up with a lot of annoying relative paths in your require calls like:

const Article = require('../../../../app/models/article');

Those suck for maintenance and they're ugly.

	struct SnapshotInterpolationPlugin {
	max_tick_rate: u16,
	}
	impl Plugin for SnapshotInterpolationPlugin {
	fn build(&self, app: &mut App) {
	app.replicate::<Interpolated>()
	.insert_resource(InterpolationConfig {
	max_tick_rate: self.max_tick_rate,
	});
	}

	Readme: In the following pseudo code, [] indicates a subroutine.
	Sometimes I choose to write the subroutine inline under the [] in order to maintain context.
	One important fact about the way rollbacks are handled here is that we are storing state for every frame.
	In any real implementation you only need to store one game state at a time. Storing a game
	state for every frame allows us to only rollback to the first frame where the predicted inputs don't match the true ones.


	==Constants==
	MAX_ROLLBACK_FRAMES := Any Positive Integer # Specifies the maximum number of frames that can be resimulated
	FRAME_ADVANTAGE_LIMIT := Any Positive Integer # Specifies the number of frames the local client can progress ahead of the remote client before time synchronizing.

	/*
	Delta Compression by Glenn Fiedler.
	This source code is placed in the public domain.
	http://gafferongames.com/2015/03/14/the-networked-physics-data-compression-challenge/
	*/

	#include <stdint.h>
	#include <stdio.h>
	#include <assert.h>
	#include <string.h>

	# Hello, and welcome to makefile basics.
	#
	# You will learn why `make` is so great, and why, despite its "weird" syntax,
	# it is actually a highly expressive, efficient, and powerful way to build
	# programs.
	#
	# Once you're done here, go to
	# http://www.gnu.org/software/make/manual/make.html
	# to learn SOOOO much more.

	%%%-------------------------------------------------------------------
	%%% @author aardvocate
	%%% @copyright (C) 2014, <COMPANY>
	%%% @doc
	%%%
	%%% @end
	%%% Created : 03. Sep 2014 11:02 PM
	%%%-------------------------------------------------------------------
	%%%
	%%% This module provides a method will add new mnesia columns to an already running mnesia instance without losing data.

	#!/usr/bin/env escript
	% -- mode: erlang --

	main([BeamFile]) ->
	{ok,{_,[{abstract_code,{_,AC}}]}} = beam_lib:chunks(BeamFile,[abstract_code]),
	io:fwrite("~s~n", [erl_prettypr:format(erl_syntax:form_list(AC))]).