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Pub/Sub pattern with PostgreSQL's LISTEN/NOTIFY command

This is a simple chat-like program using pub-sub pattern, backed by PostgreSQL's LISTEN/NOTIFY command.

Publish

publish message to foo channel from user nickname.

$ python pub.py foo nickname
PUBLISH to channel #foo

Clojure Destructuring Tutorial and Cheat Sheet

(Related blog post)

Simply put, destructuring in Clojure is a way extract values from a datastructure and bind them to symbols, without having to explicitly traverse the datstructure. It allows for elegant and concise Clojure code.

Vectors

如果你的iOS项目项目中要使用zmq,那么肯定会涉及到以下问题:

Compiling Libzmq as a Universal Static Library for iOS
Use Libzmq in project

Step 1)prepare the zeromq sources for iOS

download the POSIX tarball from zeromq web site
uncompress the tarball

HTTP Streaming (or Chunked vs Store & Forward)

The standard way of understanding the HTTP protocol is via the request reply pattern. Each HTTP transaction consists of a finitely bounded HTTP request and a finitely bounded HTTP response.

However it's also possible for both parts of an HTTP 1.1 transaction to stream their possibly infinitely bounded data. The advantages is that the sender can send data that is beyond the sender's memory limit, and the receiver can act on

	//
	// LinkedTextView.h
	//
	// Created by Benjamin Bojko on 10/22/14.
	// Copyright (c) 2014 Benjamin Bojko. All rights reserved.
	//

	#import <UIKit/UIKit.h>

	/**

	// code not guaranteed to work!!!! never ran it

	// On the server
	Meteor.publish("myData", {
	var subscription = this;
	var data = HTTP.call("https://reddit.com/r/funny.json").data.children;

	data.forEach(function (item) {
	subscription.added("my-collection", item);
	});

	<?xml version="1.0" encoding="UTF-8"?>
	<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.example</groupId>
	<artifactId>my-project</artifactId>
	<version>0.0.1-SNAPSHOT</version>

	<dependencies>
	<!-- none yet -->

	var express = require('express');
	var http = require('http');
	var app = express();

	// Simple user controller implementation.
	var users = [
	{ username: 'jamsesso', age: 20, gender: 'M' },
	{ username: 'bettycrocker', age: 20, gender: 'F' }
	];

	// swift Package.swift

	import PackageDescription

	let package = Package(
	name: "demo-pgsql",
	dependencies: [
	.Package(url: "https://github.com/PerfectlySoft/Perfect-PostgreSQL.git", majorVersion: 2, minor: 0)
	]
	)