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时间：2007-07-08
把之前一篇的源碼重整理了一下，作了這個 plugin。
1. 準備 * 下載和安裝 Ruby on Rails * 下載和安裝 Apache ActiveMQ * 安裝 Mongrel ( sudo gem install mongrel ) * 安裝 json (sudo gem install json) * 安裝 stomp (sudo gem install stomp) 2. 產生 chat room 軟件 rails chat 3. 安裝 AjaxMessaging plugin cd chat script/plugin install http://ajaxmessaging.googlecode.com/svn/trunk/plugins/ajaxmessaging 4. 設定 a. 設定 Apache ActiveMQ (topic 'chat') ACTIVEMQ_HOME/conf/activemq.xml <beans>
<!-- Allows us to use system properties as variables in this configuration file -->
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"/>
<broker brokerName="localhost" useJmx="true" xmlns="http://activemq.org/config/1.0">
<!-- In ActiveMQ 4, you can setup destination policies -->
<destinationPolicy>
<policyMap><policyEntries>
<policyEntry topic="chat>">
<dispatchPolicy>
<strictOrderDispatchPolicy />
</dispatchPolicy>
<subscriptionRecoveryPolicy>
<lastImageSubscriptionRecoveryPolicy/>
</subscriptionRecoveryPolicy>
</policyEntry>
</policyEntries></policyMap>
</destinationPolicy>
<persistenceAdapter>
<journaledJDBC journalLogFiles="5" dataDirectory="${activemq.base}/activemq-data"/>
</persistenceAdapter>
<transportConnectors>
<transportConnector name="stomp" uri="stomp://localhost:61613"/>
</transportConnectors>
<networkConnectors>
<!-- by default just auto discover the other brokers -->
<networkConnector name="default-nc" uri="multicast://default"/>
</networkConnectors>
</broker>
</beans>
b. 設定 AjaxMessaging (我們用預設值就可以了) config/a11g.yml USERNAME: PASSWORD: HOST: localhost PORT: 61613 RELIABLE: false DEFAULT_CHANNELS: default CHANNEL_ROOT: /topic/ BASE_URL: /amq POLL_DELAY: 0.0 TIMEOUT: 30 c. 設定資料庫 (我們用 sqlite3) config/database.yml development: adapter: sqlite3 database: db/dev encoding: utf8 timeout: 5000 test: adapter: sqlite3 database: db/test encoding: utf8 timeout: 5000 production: adapter: sqlite3 database: db/prod encoding: utf8 timeout: 5000 d. 設定 Mongrel config/mongrel_conf.yml :config_script: lib/ajax_messaging_handler.rb 5. 準備 Data Model 和 Scaffold ./script/generate scaffold_resource chat name:string message:string rake db:migrate 6. 修改 Chat Layout app/view/layouts/chats.rhtml <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="content-type" content="text/html;charset=UTF-8" />
<title>Chats: <%= controller.action_name %></title>
<%= stylesheet_link_tag 'scaffold' %>
<%= javascript_include_tag :defaults %>
<%= yield :script %>
</head>
<body>
<p style="color: green"><%= flash[:notice] %></p>
<%= yield %>
</body>
</html>
7. 修改 index view app/view/chats/index.rhtml <% content_for("script") do %>
<%= a11g_listen_to('chat') %>
<% end %>
<!-- form to input message -->
<%= render_component :action => 'new' %>
<!-- message list -->
<ul id="chat-list">
<% for chat in @chats %>
<%= render_component :action => 'show', :id => chat.id %>
<% end %>
</ul>
8. 修改 new view app/views/chats/new.rhtml <% form_remote_for(:chat, :url => chats_path) do |f| %> <%= f.text_field :name %> <%= f.text_field :message %> <%= submit_tag "Talk" %> <% end %> 9. 修改 show view 去顯示訊息 app/views/chats/show.rhtml <li> <%=h @chat.name %> <%=h @chat.message %> </li> 10. 修改 chat controller app/controllers/chats_controller rb class ChatsController < ApplicationController
layout 'chats', :only => 'index'
def index
@chats = Chat.find(:all).reverse
end
def show
@chat = Chat.find(params[:id])
end
def create
@chat = Chat.create(params[:chat])
# create HTML string to show a message
content = render_component_as_string :action => 'show', :id => @chat.id
# create JS string to add a message on list
javascript = render_to_string :update do |page|
page.insert_html :top, 'chat-list', content
end
AjaxMessaging.send_data 'chat', javascript
# nothing is rendered
render :nothing => true
end
end
11. 啟動伺服器 a. 啟動 ActiveMQ : cd apache-activemq ./bin/activemq b. 啟動 Mongrel cd chat mongrel_rails start –C ./config/mongrel_conf.rb c. 開始 Chat 開啟瀏覽器瀏覽http://localhost:3000/chats，你的訊息會即時被其他在這 chat room的人看到。有些瀏覽器限制了同一個網站的連線數目 (如 Firefox) ，想在同一電腦跟自己 chat ，請用兩個不同的 browser。 Credit: 這個教學來自 shooting_star 的相同教學。如果你需要完整、強大又穩定的 comet server，大概你需要的是 shooting_star。 相關連結： * 原文：用 AjaxMessaging 在五分鍾內造一個 chat room * 有關這個 chat room 的原理，請讀 Ruby on Rails + AJAX + Mongrel + JMS/MQ/MOM = 即時通訊 * AjaxMessaging Project Home Page 声明：JavaEye文章版权属于作者，受法律保护。没有作者书面许可不得转载。
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