Lincoln Lee linc01n

These links no longer work. Springer have pulled the free plug.

Graduate texts in mathematics

duplicates = multiple editions

A Classical Introduction to Modern Number Theory, Kenneth Ireland Michael Rosen

Your challenge, should you accept it, is to write a Ruby library that will modify an existing program to output the number of times a specific method is called.

You solution library should be required at the top of the host program, or via ruby's -r flag (i.e. ruby -r ./solution.rb host_program.rb).

Your solution library should read the environment variable COUNT_CALLS_TO to determine the method it should count. Valid method signatures are Array#map!, ActiveRecord::Base#find, Base64.encode64, etc.

Your solution library should count calls to that method, and print the method signature and the number of times it was called when the program exits.

Also, your solution should have a minimal impact on the program's running time. set_trace_func is a no-go...

Locate the section for your stash remote in the .git/config file. It looks like this:

[remote "origin"]
	fetch = +refs/heads/*:refs/remotes/origin/*
	url = git@stash.internal:private/repository.git

Now add the line fetch = +refs/pull-requests/*:refs/remotes/origin/pull-requests/* to this section. Obviously, change the stash url to match your project's URL. It ends up looking like this:

	require 'webrick'
	require 'webrick/https'
	require 'ds9'

	class HTTP2Server < WEBrick::HTTPServer
	SETTINGS = [ [DS9::Settings::MAX_CONCURRENT_STREAMS, 100] ]

	class HTTP2Response < WEBrick::HTTPResponse
	def initialize config, ctx, stream_id
	@ctx = ctx

	require 'socket'
	require 'openssl'
	require 'puma/server'
	require 'ds9'

	class Server < DS9::Server
	def initialize socket, app
	@app = app
	@read_streams = {}
	@write_streams = {}

	/*
	The original script: https://github.com/dherbst/slack-invite-script/blob/master/code.js
	*/


	/*
	Get channels from: curl 'https://golang.slack.com/api/channels.list?token={token}' \| json_pp
	*/
	function getInviteChannels() {
	return ['C123123123'];

	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<link href='http://fonts.googleapis.com/css?family=Indie+Flower' rel='stylesheet' type='text/css'>

	<style>
	html {
	padding: 5mm;
	background-color: #e9e9e9;

	#!/usr/bin/env ruby
	#
	# Mac fix 1 - Install the Nokogiri gem on Mac OS 10.9 Mavericks
	#
	# Usage: to configure and install using Bundler, pass in 'bundle' as an argument to the script.
	#
	# Nokogiri works at a very low level, so it has many issues on various platforms.
	# As a result, the command `install gem nokogiri` often will fail. This fix is for
	# errors involving 'libiconv', such as the following one I encountered:
	#

	# CONFIG
	SNMP_COMMUNITY=public
	SYSCONTACT=dan
	SYSLOCATION=Berlin

	# get packages
	apt-get install snmpd xinetd vim

	mkdir -p /opt/observium && cd /opt

	ssl on;
	ssl_certificate /path/to/certs/thedotproduct.org.pem;
	ssl_certificate_key /path/to/certs/thedotproduct.org.key.unsigned;

	# References used along with my own work:
	# https://raymii.org/s/tutorials/Pass_the_SSL_Labs_Test_on_NGINX_(Mitigate_the_CRIME_and_BEAST_attack_-_Disable_SSLv2_-_Enable_PFS).html
	# https://coderwall.com/p/ebl2qa
	# http://hynek.me/articles/hardening-your-web-servers-ssl-ciphers/
	# http://code-bear.com/bearlog/2013/06/26/nginx-ssl-config-for-forward-secrecy/
	# https://www.owasp.org/index.php/Transport_Layer_Protection_Cheat_Sheet#Rule_-_Only_Support_Strong_Cryptographic_Ciphers