极简Ruby依赖注入框架：Dim

DIM是一个极简依赖注入框架。

依赖注入通过创建容器来帮助你组织应用的对象初始化代码。当应用中的对象需要访问其他对象或资源的时候，它要求容器来提供（通过惰性加载的代码区块）。

例子

在lib.init.rb中加入如下代码：（Rails应用使用config/initializers/container.rb）

require "dim"  require "logger"  require 'game'  require 'event_handler'  require 'transmitter'    ServerContainer = Dim::Container.new    ServerContainer.register(:transmitter) { |c| Transmitter.new(c.logger) }    ServerContainer.register(:event_handler) do |c|    eh = EventHandler.new    eh.transmitter = c.transmitter    eh.logger = c.logger    eh  end    ServerContainer.register(:listening_host) { "0.0.0.0" }  ServerContainer.register(:listening_port) { "8080" }    ServerContainer.register(:game) do |c|    game = Game.new    game.logger = c.logger    game.event_handler = c.event_handler    game.host = c.listening_host    game.port = c.listening_port    game  end    ServerContainer.register(:root_dir) do |c|    Pathname.new(File.expand_path(File.dirname(__FILE__) + "/.."))  end    ServerContainer.register(:log_file_path) do |c|    "#{c.root_dir}/log/#{c.environment}.log"  end    ServerContainer.register(:logger) do |c|    Logger.new(c.log_file_path)  end    # attempts to read ENV["API_PASSWORD"], otherwise makes sure that the parent container has  # a service named api_password registered  ServerContainer.register_env(:api_password)

ServerContainer.logger.info("I didn't have to setup my own logger")

如果你需要访问game实例（初始化时已经创建好了）：

current_game = ServerContainer.game

如果你不喜欢使用全局常量ServerContainer，你可以将ServerContainer本身注入对象：

World.new(GameContainer)

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