hugodotlau

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?

hugodotlau

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.*;

public class JsonHelper {
    public static Object toJSON(Object object) throws JSONException {
        if (object instanceof Map) {
            JSONObject json = new JSONObject();

hugodotlau

<?php
#ref: http://www.yiiframework.com/forum/index.php/topic/15298-how-can-i-get-random-values-from-model/page__view__findpost__p__76052

$max = Table::model()->count(array(
    'condition' => 'status<:status',
    'params'    => array('status' => Table::STATUS_A)
));

$offset = rand(0,$max);

hugodotlau

<?php
/**
 * FlashBehavior class file.
 */
class FlashBehavior extends CActiveRecordBehavior
{	
	/**
	 * @var string key identifying the flash message
	 */
	public $key = 'success';

hugodotlau

<?php

/**
 * @property int $bit_id
 */
class Thing extends CActiveRecord {
}

/**
 * @property int $id

hugodotlau

～键盘输入
Ctrl+T：将光标所在处的字符和光标前一字符对调，T，可以理解为Transfer。
Alt+T：交换两个光标当前所处位置单词和光标前一个单词。
Ctrl+U：从光标所在处开始删除字符，直到行首；u，可以理解为undo光标前所有输入。
Ctrl+Y：恢复Ctrl+U删除的字符；y，可以理解为vim里的yank（复制）。
Ctrl+?：删除所有字符，比Ctrl+U强。
Ctrl+K：从光标所在处开始删除字符，直到行尾。
Ctrl+W：删除最后一个单词；W，Word。

hugodotlau

Sublime Text 2 – Useful Shortcuts (PC)

Loosely ordered with the commands I use most towards the top. Sublime also offer full documentation.

Editing

Ctrl+C	copy current line (if no selection)
Ctrl+X	cut current line (if no selection)
Ctrl+⇧+K	delete line
Ctrl+↩	insert line after

hugodotlau

<?php

public function actionBatchUpdate($id)
{
    $model = Product::model()->findByPk($id);
    $items=Retailprice::model()->findAllByAttributes(array('product_id'=>$id));
    if(isset($_POST['Retailprice']))
    {
   
        $valid=true;

hugodotlau

<?php
    /**
     * Checks to see if the user IP is allowed by {@link ipFilters}.
     * @param string $ip the user IP
     * @return boolean whether the user IP is allowed by {@link ipFilters}.
     */
    protected function allowIp($ip)
    {
        foreach ($this->ipFilters as $filter)
        {

hugodotlau

<?php
/**
* A class for true random hash string generation.
*/
class RandHash
{
    /**
    * @param string $prefix to be used with uniqid()
    * @return string hash
    */