zhangw

use Rack::Lint # gives more descriptive error messages when responses aren't valid

class LogIt
  def initialize(app)
    @app = app
  end
  def call(env)
    status, headers, body  = @app.call(env)
    body.map { |chunk| p "LogIt: #{chunk}" }

zhangw

module Where
  class <<self
    attr_accessor :editor
    
    def is_proc(proc)
      source_location(proc)
    end
    
    def is_method(klass, method_name)
      source_location(klass.method(method_name))

zhangw

I use the first


—– BEGIN LICENSE —–
Michael Barnes
Single User License
EA7E-821385
8A353C41 872A0D5C DF9B2950 AFF6F667
C458EA6D 8EA3C286 98D1D650 131A97AB
AA919AEC EF20E143 B361B1E7 4C8B7F04

zhangw

//To fetch a branch, you simply need to:

git fetch origin

//This will fetch all of the remote branches for you. With the remote branches 
//in hand, you now need to check out the branch you are interested in, giving 
//you a local working copy:

git checkout -b test origin/test

zhangw

Latency Comparison Numbers
--------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

zhangw

mkdir -p /usr/local/etc/nginx/sites-{enabled,available}
cd /usr/local/etc/nginx/sites-enabled
ln -s ../sites-available/default.conf
ln -s ../sites-available/default-ssl.conf

File locations:

• nginx.conf to /usr/local/etc/nginx/
• default.conf and default-ssl.conf to /usr/local/etc/nginx/sites-available
• homebrew.mxcl.nginx.plist to /Library/LaunchDaemons/

zhangw

package com.company;

import javax.crypto.Cipher;
import javax.crypto.Mac;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.security.MessageDigest;
import java.security.SecureRandom;

public class Main {

zhangw

鉴权学习

对于一个API请求，开发平台一般需要知道下面几件事情：

1. 哪个应用发起这个请求（Which application is making the request）
2. 这个请求是为哪个用户发起的（Which user the request is posting on behalf of）
3. 用户是否对这个请求进行授权（Whether the user has granted the application authorization to post on the user's behalf）
4. 请求是否在传输过程中被篡改（Whether the request has been tampered by a third party while in transit）

zhangw

# All credit: http://stackoverflow.com/questions/4006324/how-to-atomically-delete-keys-matching-a-pattern-with-redis
redis-cli [options] KEYS "prefix:*" | xargs redis-cli [options] DEL

zhangw

import java.time.*;
import java.time.format.DateTimeFormatter;
import java.time.format.FormatStyle;
import java.time.temporal.ChronoUnit;
import java.time.temporal.TemporalAdjusters;
import java.util.*;

import static java.time.temporal.TemporalAdjusters.*;

public class Java8DateTimeExamples {