Justin Blake blaix

On Tue, Mar 12, 2013 at 1:26 PM, Martin Fowler [email protected] wrote:

The term pops up in some different places, so it's hard to know what it means without some context. In PoEAA I use the pattern Service Layer to represent a domain-oriented layer of behaviors that provide an API for the domain layer. This may or may not sit on top of a Domain Model. In DDD Eric Evans uses the term Service Object to refer to objects that represent processes (as opposed to Entities and Values). DDD Service Objects are often useful to factor out behavior that would otherwise bloat Entities, it's also a useful step to patterns like Strategy and Command.

It sounds like the DDD sense is the sense I'm encountering most often. I really need to read that book.

The conceptual problem I run into in a lot of codebases is that rather than representing a process, the "service objects" represent "a thing that does the process". Which sounds like a nitpicky difference, but it seems to have a real impact on how people us

	# run binary from project's node_modules/.bin dir
	# ex: ne coffee
	# see http://stackoverflow.com/a/15157360/193813
	# alias ne="PATH=$(npm bin):$PATH"
	# above alias not working for me, using function instead:
	ne() {
	$(npm bin)/$*
	}

	# run binary from project's node_modules/.bin dir
	# ex: ne coffee
	# see http://stackoverflow.com/a/15157360/193813
	# alias ne="export PATH=$(npm bin):$PATH"
	# above alias not working for me, using function instead:
	ne() {
	$(npm bin)/$*
	}

	#!/bin/bash

	set -e

	echo "-----------------------------------------------------"
	echo "Installing the essentials..."
	echo "-----------------------------------------------------"

	sudo apt-get update
	sudo apt-get -y upgrade

	man = ?@

	class << man
	attr_accessor :x, :y, :speed

	def to_point
	[x, y]
	end

	def speed

	class Chore
	def frequency
	Frequency.const_get(frequency_class).new
	end

	def done?
	frequency.within_current_period?(last_completed)
	end
	end

	button, .btn-primary, .btn-info, .btn-success, .btn-warning, .btn-danger {
	.btn();
	}

	var listify = function(messages) {
	return $.map(messages, function(msg) {
	return "<li>" + msg + "</li>";
	});
	}