Chicago Boss: a server framework inspired by Rails and written in Erlang

来源：互联网发布：探地雷达测的数据图编辑：程序博客网时间：2024/05/16 11:09

官网：http://www.chicagoboss.org/

下载：https://github.com/evanmiller/ChicagoBoss/

代码：

1. 创建工程:

git clone https://github.com/evanmiller/ChicagoBoss.git

cd ChicagoBoss

make

make app PROJECT=myapp

cd ../myapp

./init-dev.sh

2. src/controller/myapp_greeting_controller.erl

-module(myapp_greeting_controller, [Req]).-compile(export_all).hello('GET', []) ->  {ok, [{greeting, "Hello World!"}]}.list('GET', []) ->  Greetings = boss_db:find(greeting, []),  {ok, [{greetings, Greetings}]}.create('GET', []) ->  ok;create('POST', []) ->  GreetingText = Req:post_param("greeting_text"),  NewGreeting = greeting:new(id, GreetingText),  %{ok, SavedGreeting} = NewGreeting:save(),  %{redirect, [{action, "list"}]}.  case NewGreeting:save() of    {ok, SavedGreeting} ->      {redirect, [{action, "list"}]};    {error, ErrorList} ->      {ok, [{errors, ErrorList}, {new_msg, NewGreeting}]}  end.goodbye('POST', []) ->  boss_db:delete(Req:post_param("greeting_id")),  {redirect, [{action, "list"}]}.send_test_message('GET', []) ->  TestMessage = "Free at last!",  boss_mq:push("test-channel", TestMessage),  {output, TestMessage}.pull('GET', [LastTimestamp]) ->  {ok, Timestamp, Greetings} = boss_mq:pull("new-greetings", list_to_integer(LastTimestamp)),  {json, [{timestamp, Timestamp}, {greetings, Greetings}]}.live('GET', []) ->  Greetings = boss_db:find(greeting, []),  Timestamp = boss_mq:now("new-greetings"),  {ok, [{greetings, Greetings}, {timestamp, Timestamp}]}.

src/model/greeting.erl

-module(greeting, [Id, GreetingText]).-compile(export_all).validation_tests() ->  [    {fun() -> length(GreetingText) > 0 end, "Greeting must be non-empty!"},    {fun() -> length(GreetingText) =< 140 end, "Greeting must be tweetable"}  ].before_create() ->  ModifiedRecord = set(greeting_text, re:replace(GreetingText, "masticate", "chew", [{return, list}])),  {ok, ModifiedRecord}.after_create() ->  boss_mq:push("new-greetings", THIS).

src/view/hello.html

<b>{{ greeting|upper }}</b>

src/view/list.html

<html><head>    <title>{% block title %}Greetings!{% endblock %}</title></head><body>{% block body %}<ul>    {% if greetings %}    {% for greeting in greetings %}    <li>{{ greeting.greeting_text }}        {% endfor %}        {% else %}    <li>No greetings!        {% endif %}</ul><p><a href="{% url action="create" %}">New greeting...</a></p><form method="post" action="{% url action="goodbye" %}">Delete:<select name="greeting_id">    {% for greeting in greetings %}    <option value="{{ greeting.id }}">{{ greeting.greeting_text }}        {% endfor %}</select><input type="submit"></form>{% endblock %}</body></html>

src/view/create.html

{% extends "greeting/list.html" %}{% block title %}A new greeting!{% endblock %}{% block body %}{% if errors %}<ul>    {% for error in errors %}    <li><font color=red>{{ error }}</font>        {% endfor %}</ul>{% endif %}<form method="post">    Enter a new greeting:    <textarea name="greeting_text">{% if new_msg %} {{ new_msg.greeting_text }}{% endif %}</textarea> <input type="submit"></form>{% endblock %}

src/view/live.html

<html><head>    <title>Fresh hot greetings!</title>    <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.0/jquery.min.js"></script>    <script>        function listen_for_events(timestamp) {            $.ajax("/greeting/pull/"+timestamp, {                success: function(data, code, xhr) {                    for (var i=0; i<data.greetings.length; i++) {                        var msg = data.greetings[i].greeting_text;                        $("#greeting_list").append("<li>"+msg);                    }                    listen_for_events(data.timestamp);                }            });        }        $(document).ready(function() {            listen_for_events({{ timestamp }});        });    </script></head><body><ul id="greeting_list">    {% for greeting in greetings %}    <li>{{ greeting.greeting_text }}        {% empty %}    <li>No greetings!        {% endfor %}</ul></body></html>