Steven Cook eldritchideen

Golang Job Queue

A running example of the code from:

Step 1

Small refactorings made to original code:

If you are seeing Mongo soft rlimits warnings in your logs, or a WARNING: soft rlimits too low. Number of files is 256, should be at least 1000 when you login to mongo shell via mongo from the commandline, or any mysterious/unexplained mongo connection errors... follow this how-to exactly and it will resolve the issue for you.

(Source of this how to found at basho/basho_docs#1402)

First file: sudo vi /Library/LaunchDaemons/limit.maxfiles.plist

...containing:

Sample Project

Starting from:

lein new foo
cd foo

Say I have a random JAR file that is not available in any repository:

touch README.md

This is my recommended path for learning Haskell.

Something to keep in mind: don't sweat the stuff you don't understand immediately. Just keep moving.

Primary course

http://www.seas.upenn.edu/~cis194/lectures.html Brent Yorgey's course is the best I've found so far and replaces both Yann Esposito's HF&H and the NICTA course. This course is particularly valuable as it will not only equip you to write Haskell but also help you understand parser combinators.

Exercises for practice

I like Learn You a Haskell as a reference and cheat-sheet but I found it a little slow for learning Haskell.

Here's my recommended order for just learning Haskell:

http://www.seas.upenn.edu/~cis194/lectures.html Brent Yorgey's course is the best I've found so far and replaces both Yann Esposito's HF&H and the NICTA course. This course is particularly valuable as it will not only equip you to write Haskell but also help you understand parser combinators.

Real World Haskell is available online. (Thanks bos!)

I recommend RWH as a reference (thick book). The chapters for parsing and monads are great for getting a sense for where monads are useful. Other people have said that they've liked it a lot. Perhaps a good follow-up for practical idioms after you've got the essentials of Haskell down?

	"**************************************************************************
	* Allowable characters: *
	* - a-z *
	* - A-Z *
	* - 0-9 *
	* - .+/\~<>@%\|&?
	* - blank, tab, cr, ff, lf *
	* *
	* Variables: *
	* - variables must be declared before use *

	package main

	import (
	"fmt"
	"github.com/gorilla/mux"
	"github.com/gorilla/securecookie"
	"net/http"
	)

	// cookie handling

	def take_while(fn, coll):
	"""Yield values from coll until fn is False"""
	for e in coll:
	if fn(e):
	yield e
	else:
	return

	def partition(n, coll, step=None):
	return take_while(lambda e: len(e) == n,

	from zipline.algorithm import TradingAlgorithm
	from zipline.transforms import MovingAverage
	from zipline.utils.factory import load_from_yahoo
	from zipline.finance.slippage import FixedSlippage
	from zipline.finance.commission import PerShare
	from datetime import datetime
	import matplotlib.pyplot as plt

	class DualMovingAverage(TradingAlgorithm):


	/**
	* gc monitoring only on jdk7 or later
	*
	* @author lichengwu
	* @version 1.0
	* @created 2013-09-14 10:44 PM
	*/
	public class GCMonitoring {