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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?

weidiaoxiang

/**
 * # Global logging module
 *
 * This is a global set of hooks that catch all $log messages sent out by the
 * application. Currently they are simply passed off directly to console.log
 * but this could be updated later to allow them to be stored locally, sent to
 * a server etc.
 */

angular.module('ngLogging', [])

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/*
 * Copyright 2013 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software

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<?xml version="1.0" encoding="UTF-8"?>
<!-- 
  ## SOURCE: xe.com
-->
<currency-symbol count="115">
  <entry code="ALL" unicode-decimal="76, 101, 107" unicode-hex="4c, 65, 6b">Albania Lek</entry>
  <entry code="AFN" unicode-decimal="1547" unicode-hex="60b">Afghanistan Afghani</entry>
  <entry code="ARS" unicode-decimal="36" unicode-hex="24">Argentina Peso</entry>
  <entry code="AWG" unicode-decimal="402" unicode-hex="192">Aruba Guilder</entry>
  <entry code="AUD" unicode-decimal="36" unicode-hex="24">Australia Dollar</entry>

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require 'rubygems'
require 'sqlite3'
require 'rexml/document'
include REXML

xml =<<XML
<records>
  <entry><name>abc</name><qty>3</qty></entry>
  <entry><name>def</name><qty>5</qty></entry>
  <entry><name>ghi</name><qty>2</qty></entry>

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// THIS IS A BETA! I DON'T RECOMMEND USING IT IN PRODUCTION CODE JUST YET

/*
 * Copyright 2012 Roman Nurik
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0