vasanthk

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

pythonesque

// Implements http://rosettacode.org/wiki/Checkpoint_synchronization
//
// We implement this task using Rust's Barriers.  Barriers are simply thread
// synchronization points--if a task waits at a barrier, it will not continue
// until the number of tasks for which the variable was initialized are also
// waiting at the barrier, at which point all of them will stop waiting.  This
// can be used to allow threads to do asynchronous work and guarantee properties
// at checkpoints.

use std::sync::atomic::AtomicBool;

dom96

import macros

macro `=>`(p, b: expr): expr {.immediate.} =
  echo treeRepr(p)
  #echo(treeRepr(b))
  var params: seq[PNimrodNode] = @[newIdentNode("auto")]

  case p.kind
  of nnkPar:
    for c in children(p):

zah

there are 3 types of messages
1) statically dispatched to a certain component:
if has(Component): get(Component).doMessage(args)

2) dynamically dispatched to a single component
let (offset, proc_ptr) = entity->typeinfo->vtable[messageID]
proc_ptr(entity->data[offset], args)

3) dynamically dispatched to every component that implements them (multicast messages)
let runlist = entity->typeinfo->multicast_vtable[messageID]

fowlmouth

## entitty has been moved to the fowltek package 

fowlmouth

%w/gosu ostruct optparse/.each &method(:require)
include Gosu

file = nil
playfieldSize = nil
mode = :SNACK
ipf = 1
font = './LiberationMono-Regular.ttf'
autostart = false

fowlmouth

import irc, re, tables, macros, macro_dsl 

var
  commands = initTable[string, proc(event: var TircEvent; 
    args: string){.closure.}]()
  handlers: seq[tuple[
    pattern: TRegex; 
    match: proc(event: var TircEvent; args: var openarray[string]){.
      closure.}]] = @[]
  matchPattern: TRegex

fowlmouth

Adds a few new spells which let you eat soulgems to recharge your magicka. Find the new spells (they are actually lesser powers) in the console with help "Tome: Consume" -- I'll put them in levelled loot or something later

• Black souls restore 175 Magickz, -50% magicka regeneration for 30 seconds
• Grand souls restore 150 Magickz, -40% magicka regeneration for 30 seconds
• Greater souls restore 100 magickz, -25% magicka regen for 25 seconds
• Common souls restore 75 magickz, -18% magicka regen for 20 seconds
• Lesser souls restore 50 magickz, -12% magicka regen for 15 seconds
• Petty souls restore 25 magickz, -6% magicka regen for 10 seconds