kevinho

import android.content.Context;
import android.os.Debug;
import java.io.File;

public class OomExceptionHandler implements Thread.UncaughtExceptionHandler {

  private static final String FILENAME = "out-of-memory.hprof";

  public static void install(Context context) {
    Thread.UncaughtExceptionHandler defaultHandler = Thread.getDefaultUncaughtExceptionHandler();

kevinho

Running tests
Test running started
android.support.test.espresso.NoMatchingViewException: No views in hierarchy found matching: with content description: is "bugtags_fab_des_normal"

View Hierarchy:
+>DecorView{id=-1, visibility=VISIBLE, width=1080, height=1920, has-focus=true, has-focusable=true, has-window-focus=true, is-clickable=false, is-enabled=true, is-focused=false, is-focusable=false, is-layout-requested=false, is-selected=false, root-is-layout-requested=false, has-input-connection=false, x=0.0, y=0.0, child-count=2}
|
+->LinearLayout{id=-1, visibility=VISIBLE, width=1080, height=1776, has-focus=true, has-focusable=true, has-window-focus=true, is-clickable=false, is-enabled=true, is-focused=false, is-focusable=false, is-layout-requested=false, is-selected=false, root-is-layout-requested=false, has-input-connection=false, x=0.0, y=0.0, child-count=2}
|
+-->ViewStub{id=16909227, res-name=action_mode_bar_stub, visibility=GONE, width=0, height=0, has-focus=false, has-focusable=false, has-window-focus=tru

kevinho

 def generateMD5(String s) {
    MessageDigest digest = MessageDigest.getInstance("MD5")
    digest.update(s.bytes);
    new BigInteger(1, digest.digest()).toString(16).padLeft(32, '0')
 } 

kevinho

Docker Machine OSX Autostart

This is a simple launchd config that will start your default docker-machine on startup. You can customize the machine that is started by updating lines 11 and 16 with the correct machine name.

Install

1. Copy the file com.docker.machine.default.plist below to ~/Library/LaunchAgents/com.docker.machine.default.plist.
2. Run the following in a terminal: launchctl load ~/Library/LaunchAgents/com.docker.machine.default.plist
3. Profit!

kevinho

0xa9c51D0113FCe30aED75CB64365acB0c1f224159

kevinho

https://gist.github.com/kevinho/304a537f98e52ee01b56b4f0cabd3afc

kevinho

0xa9c51D0113FCe30aED75CB64365acB0c1f224159

kevinho

0x957c2210A92aeDeff6d7c380182FA98a8e62f08A

kevinho

洗牌随机数生成规则：
洗牌随机数由三个玩家的公钥、预言机随机数、牌局id顺序拼接而成，其中玩家的公钥按照玩家进入牌局的顺序进行拼接；
将拼接后的字符串转为16进制得到该牌局的洗牌随机数；

public static String getRandSeries(String pubKey1, String pubKey2, String pubKey3, String id){
	SecureRandom random = new SecureRandom();
	String randSeries = byte2HexStr((pubKey1+pubKey2+pubKey3+random.nextInt()+id).getBytes());
	return randSeries;
}

kevinho

Latency Comparison Numbers (~2012)
----------------------------------
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