PHP 事件驱动框架 实践
- WBOY原創
- 2016-06-06 19:53:18850瀏覽
基于CodeIgniter的事件驱动扩展和开发规范 步骤 1.数据库设计和基本结构 1.1我们用一张表来表示文件和文件夹，主要字段和意义如下表所示。 id 文件的唯一标识id name 文件名 uid 文件创建者的id created 文件创建的时间戳 modified 文件修改的时间戳 size 文
基于CodeIgniter的事件驱动扩展和开发规范
步骤
1.数据库设计和基本结构
1.1我们用一张表来表示文件和文件夹，主要字段和意义如下表所示。
| id | 文件的唯一标识id |
| name | 文件名 |
| uid | 文件创建者的id |
| created | 文件创建的时间戳 |
| modified | 文件修改的时间戳 |
| size | 文件大小 |
| type | 文件类型 |
| pid | 文件父目录的id |
| path | 文件的物理位置 |
| route | 文件从父目录到根节点的所有祖先id |
| version | 文件版本号 |
文件系统是一种简单的树形结构，特点是：文件夹节点有子节点，文件节点没有子节点。
2.类设计和定义
2.1要考虑的问题
从要实现的操作“增、删、改、查”来看，要考虑的主要问题只有一个，就是在对文件夹节点进行删改操作时，如何让上层目录和下层文件或文件夹进行相应的更改。
2.2希望的写法
1.对文件类（也可以用来表示文件夹）有简单的save , set , delete 等方法。
2.希望有一个类来表示文件的所有祖先节点，这个类可以是一个简单的文件类的集合。它在必要时可以将所有的祖先文件夹实例化。它能提供一些简单的集合操作方法。
3.希望有一个类来表示文件的所有子文件和子文件夹，他能提供一些方法让我批量操作子文件或文件夹。
2.3类定义
这里的实体类，和实体集合类参考了前端框架backbone。
我先定义了一个实体类，这个类有基本增删改查操作。
<span>class</span><span> Entity {
</span><span>private</span> <span>$attributes</span> = <span>array</span><span>();
</span><span>private</span> <span>$is_deleted</span> = <span>false</span><span>;
</span><span>public</span> <span>function</span><span> __construct() {
}
</span><span>public</span> <span>function</span> <span>reset</span>( <span>$data</span><span> ) {
</span><span>$this</span> -><span> chunk();
</span><span>return</span> <span>$this</span> -> set( <span>$data</span><span> );
}
</span><span>public</span> <span>function</span> get( <span>$attr_name</span><span> ) {
</span><span>return</span> <span>isset</span>( <span>$this</span> -> attributes[<span>$attr_name</span>] ) ? <span>$this</span> -> attributes[<span>$attr_name</span>]->value : <span>false</span><span>;
}
</span><span>public</span> <span>function</span> get_attr_detail( <span>$attr_name</span><span> ){
</span><span>return</span> <span>isset</span>( <span>$this</span> -> attributes[<span>$attr_name</span>] ) ? <span>$this</span> -> attributes[<span>$attr_name</span>] : <span>false</span><span>;
}
</span><span>public</span> <span>function</span><span> set() {
</span><span>if</span>( <span>$this</span> -><span> is_deleted ){
</span><span>return</span> <span>false</span><span>;
}
</span><span>$args</span> = <span>func_get_args</span><span>();
</span><span>if</span>( <span>count</span>( <span>$args</span>) == 1<span> ){
</span><span>$attr_array</span> = ( <span>array</span> ) <span>$args</span>[0<span>];
}</span><span>else</span> <span>if</span>( <span>count</span>( <span>$args</span>) == 2<span> ){
</span><span>$attr_array</span> = <span>array</span>(<span>$args</span>[0] => <span>$args</span>[1<span>] );
}
</span><span>foreach</span>( <span>$attr_array</span> <span>as</span> <span>$key</span> => <span>$value</span><span> ) {
</span><span>$value_obj</span> = <span>new</span><span> stdClass();
</span><span>$value_obj</span> -> changed = <span>false</span><span>;
</span><span>$value_obj</span> -> <span>new</span> = <span>true</span><span>;
</span><span>if</span>( <span>isset</span>(<span>$this</span> -> attributes[<span>$key</span><span>])){
</span><span>$value_obj</span> -> <span>new</span> = <span>false</span><span>;
</span><span>if</span>( <span>$this</span> -> attributes[<span>$key</span>] -> value !== <span>$value</span><span> ){
</span><span>$value_obj</span> -> changed = <span>true</span><span>;
</span><span>$value_obj</span> -> last = <span>$this</span> -> attributes[<span>$key</span>] -><span> value;
}
}
</span><span>$value_obj</span> -> value = <span>$value</span><span>;
</span><span>$this</span> -> attributes[<span>$key</span>] = <span>$value_obj</span><span>;
}
</span><span>return</span> <span>$this</span><span>;
}
</span><span>public</span> <span>function</span><span> chunk() {
</span><span>$this</span> -> attributes = <span>array</span><span>( );
</span><span>return</span> <span>$this</span><span>;
}
</span><span>public</span> <span>function</span><span> save() {
</span><span>return</span> <span>false</span><span>;
}
</span><span>public</span> <span>function</span><span> delete(){
</span><span>$this</span> -> deleted = <span>true</span><span>;
}
</span><span>public</span> <span>function</span><span> to_object() {
</span><span>$object</span> = <span>new</span><span> stdClass();
</span><span>foreach</span>( <span>$this</span> -> attributes <span>as</span> <span>$key</span> => <span>$value_obj</span><span> ) {
</span><span>$object</span> -> <span>$key</span> = <span>$value_obj</span> -><span>value;
}
</span><span>return</span> <span>$object</span><span>;
}
</span><span>public</span> <span>function</span><span> to_array() {
</span><span>return</span> ( <span>array</span> ) <span>$this</span> -><span> to_object();
}
</span><span>public</span> <span>function</span><span> is_empty(){
</span><span>return</span> <span>empty</span>( <span>$this</span> -><span> attributes );
}
</span><span>public</span> <span>function</span><span> is_delete(){
</span><span>return</span> <span>$this</span> -><span> deleted;
}
}</span>
然后定义了一个集合类，这个类实现了spl的IteratorAggregate 接口，使得php可以对它进行foreach操作。
<span>class</span> Entity_collection <span>implements</span><span> IteratorAggregate{
</span><span>public</span> <span>$length</span> = 0<span>;
</span><span>public</span> <span>$options</span> = <span>array</span><span>(
</span>'child_class' => "Entity"<span>
);
</span><span>public</span> <span>$children</span> = <span>array</span><span>( );
</span><span>public</span> <span>function</span> __construct( <span>$options</span><span> ) {
</span><span>$this</span> -> options = <span>array_merge</span>( <span>$this</span> -> options, <span>$options</span><span> );
</span><span>$this</span> -> load_children( <span>$this</span> -><span> options );
}
</span><span>private</span> <span>function</span> load_children( &<span>$options</span><span> ){
</span><span>if</span>( !<span>empty</span>( <span>$options</span>['children_data'<span>] ) ) {
</span><span>$this</span> -> reset_from_data( <span>$options</span>['children_data'<span>] );
} </span><span>else</span> <span>if</span>( !<span>empty</span>( <span>$options</span>['children'<span>] ) ) {
</span><span>$this</span> -> <span>reset</span>( <span>$options</span>['children'<span>] );
}
}
</span><span>public</span> <span>function</span><span> to_array() {
</span><span>$output</span> = <span>array</span><span>( );
</span><span>foreach</span>( <span>$this</span> -> children <span>as</span> <span>$child</span><span> ) {
</span><span>$output</span>[] = <span>$child</span> -><span> to_object();
}
</span><span>return</span> <span>$output</span><span>;
}
</span><span>public</span> <span>function</span> <span>reset</span>( &<span>$children</span><span> ) {
</span><span>$this</span> -> children = <span>$children</span><span>;
</span><span>$this</span> -> length = <span>count</span>( <span>$children</span><span> );
}
</span><span>public</span> <span>function</span> reset_from_data( <span>$children_data</span><span> ) {
</span><span>foreach</span>( <span>$children_data</span> <span>as</span> <span>$child_data</span><span> ) {
</span><span>$class_name</span> = <span>$this</span> -> options['child_class'<span>];
</span><span>$children_obj</span> = <span>new</span> <span>$class_name</span>( <span>$child_data</span><span> );
</span><span>if</span>( !<span>$children_obj</span> -><span> is_empty() ){
</span><span>$this</span> -> children[] = <span>$children_obj</span><span>;
}
}
</span><span>$this</span> -> length = <span>count</span>( <span>$this</span> -><span> children );
}
</span><span>public</span> <span>function</span> get( <span>$id</span><span> ){
</span><span>foreach</span>( <span>$this</span> -> children <span>as</span> &<span>$child</span><span> ){
</span><span>if</span>( <span>$child</span> -> get("id") == <span>$id</span><span> ){
</span><span>return</span> <span>$child</span><span>;
}
}
</span><span>return</span> <span>false</span><span>;
}
</span><span>public</span> <span>function</span><span> getIterator(){
</span><span>return</span> <span>new</span> ArrayIterator( <span>$this</span> -><span> children );
}
}</span>
定义了文件（文件夹）类，继承自实体类。这里注意里面使用另一个叫做file_database的单例，这个单例是用来进行具体数据库操作。单独提出来是为了提高扩展性。用户可以通过修改file_database类来应对自己的需求。
<span>class</span> <span>File</span> <span>extends</span><span> Entity{
</span><span>private</span> <span>$file_database</span><span>;
</span><span>public</span> <span>function</span> __construct( <span>$fid</span> = <span>false</span><span> ){
parent</span>::<span>__construct();
</span><span>$this</span> -> file_database = File_database::<span>get_instance();
</span><span>if</span>( <span>$fid</span><span> ){
</span><span>if</span>( <span>is_object</span>( <span>$fid</span> ) || <span>is_array</span>( <span>$fid</span><span> ) ){
</span><span>$data</span> = <span>$fid</span><span>;
}</span><span>else</span><span>{
</span><span>$data</span> = <span>$this</span> -> file_database -> load_file( <span>$fid</span><span> );
}
</span><span>$this</span> -> <span>reset</span>( <span>$data</span><span> );
}
}
</span><span>public</span> <span>function</span><span> save(){
</span><span>$data</span> = <span>$this</span> -><span> to_object();
</span><span>$id</span> = <span>$this</span> -> get( 'id'<span> );
</span><span>if</span>( <span>$id</span><span> ){
</span><span>$new_data</span> = <span>$this</span> -> file_database -> update_file( <span>$data</span><span> );
}</span><span>else</span><span>{
</span><span>$new_data</span> = <span>$this</span> -> file_database -> insert_file( <span>$data</span><span> );
}
</span><span>if</span>( <span>$new_data</span><span> ){
</span><span>$this</span> -> <span>reset</span>( <span>$new_data</span><span> );
}</span><span>else</span><span>{
</span><span>//</span><span>错误处理</span>
<span> }
</span><span>return</span> <span>$this</span><span>;
}
</span><span>public</span> <span>function</span><span> delete(){
}
}</span>
文件祖先类，这里注意它不是直接集成自实体集合类。
<span>class</span> File_ancenstors <span>implements</span><span> IteratorAggregate{
</span><span>public</span> <span>$file</span> = <span>false</span><span>;
</span><span>public</span> <span>$ancestors</span><span>;
</span><span>public</span> <span>function</span> __construct( <span>$fid</span><span> ){
</span><span>$this</span> -> <span>file</span> = <span>new</span> <span>File</span>( <span>$fid</span><span> );
</span><span>$this</span> -> load_ancestor_entities( <span>$this</span> -> <span>file</span> -> get( 'route'<span> ) );
}
</span><span>private</span> <span>function</span> load_ancestor_entities( <span>$route</span><span> ){
</span><span>$ancestor_ids</span> = <span>explode</span>( '/', <span>$route</span><span> );
</span><span>$collection_options</span> = <span>array</span><span>(
</span>'child_class' => "File",
'children_data' => <span>$ancestor_ids</span><span>
);
</span><span>$this</span> -> ancestors = <span>new</span> Entity_collection( <span>$collection_options</span><span> );
</span><span>return</span> <span>$this</span><span>;
}
</span><span>public</span> <span>function</span><span> getIterator(){
</span><span>return</span> <span>$this</span> -><span> ancestors;
}
}</span>
子文件（不包括后代文件）集合类
<span>class</span> File_children <span>extends</span><span> Entity_collection{
</span><span>private</span> <span>$file_database</span><span>;
</span><span>public</span> <span>function</span> __construct( <span>$fid</span><span> ){
</span><span>$this</span> -> file_database = File_database::<span>get_instance();
</span><span>$options</span> = <span>array</span><span>(
</span>'child_class' => 'File',<span>
);
parent</span>::__construct( <span>$options</span><span> );
</span><span>$this</span> -> load_children_entities( <span>$fid</span><span> );
}
</span><span>public</span> <span>function</span> load_children_entities( <span>$fid</span><span> ){
</span><span>$children_data</span> = <span>$this</span> -> file_database -> load_children_files( <span>$fid</span><span> );
</span><span>$this</span> -> reset_from_data( <span>$children_data</span><span> );
</span><span>return</span> <span>$this</span><span>;
}
}</span>
最后数据库操作类
<span>class</span><span> File_database{
</span><span>const</span> table = 'files'<span>;
</span><span>static</span> <span>$instance</span> = <span>false</span><span>;
</span><span>private</span> <span>$CI</span> = <span>false</span><span>;
</span><span>static</span> <span>function</span><span> get_instance(){
</span><span>if</span>( !File_database::<span>$instance</span><span> ){
</span><span>new</span><span> File_database();
}
</span><span>return</span> File_database::<span>$instance</span><span>;
}
</span><span>private</span> <span>$db</span><span>;
</span><span>public</span> <span>function</span><span> __construct(){
</span><span>$this</span> -> CI = &<span>get_instance();
</span><span>$this</span> -> db = <span>$this</span> -> CI -><span> db;
self</span>::<span>$instance</span> = &<span>$this</span><span>;
}
</span><span>public</span> <span>function</span> load_file( <span>$fid</span><span> ){
</span><span>$mid</span> = <span>$this</span> -> CI -> user -> id % var_get("user_mod"<span>);
</span><span>$table_name</span> = self::table ."_{<span>$mid</span>}"<span>;
</span><span>return</span> <span>$this</span> -> db -> get_where( <span>$table_name</span>, <span>array</span>( "id" => <span>$fid</span> ) ) -><span> row();
}
</span><span>public</span> <span>function</span> update_file( <span>$file</span><span> ){
</span><span>if</span>( !<span>isset</span>( <span>$file</span> -><span> id ) ){
</span><span>return</span> <span>false</span><span>;
}
</span><span>$update_data</span> = ( <span>array</span> ) <span>$file</span><span>;
</span><span>$mid</span> = <span>$update_data</span>['uid'] % var_get("user_mod"<span>);
</span><span>$table_name</span> = self::table."_{<span>$mid</span>}"<span>;
</span><span>$this</span> -> db -> where( "id", <span>$update_data</span>['id'<span>] );
</span><span>unset</span>( <span>$update_data</span>['id'<span>] );
</span><span>$update_result</span> = <span>$this</span> -> db -> update( <span>$table_name</span>, <span>$update_data</span><span> );
</span><span>return</span> <span>$update_result</span> ? <span>$file</span> : <span>false</span><span>;
}
</span><span>public</span> <span>function</span> insert_file( <span>$file</span><span> ){
</span><span>if</span>( <span>isset</span>( <span>$file</span> -><span> id ) ){
</span><span>return</span> <span>false</span><span>;
}
</span><span>$insert_data</span> = ( <span>array</span> ) <span>$file</span><span>;
</span><span>$insert_data</span>['id'] = <span>$this</span> -><span> generate_file_id();
</span><span>$mid</span> = <span>$insert_data</span>['uid'] % var_get("user_mod"<span>);
</span><span>$table_name</span> = self::table."_{<span>$mid</span>}"<span>;
</span><span>$insert_result</span> = <span>$this</span> -> db -> insert( <span>$table_name</span>, <span>$insert_data</span><span> );
</span><span>if</span>( <span>$insert_result</span><span> ){
</span><span>$this</span> -> db -> where( 'id', <span>$insert_data</span>['id'<span>] );
</span><span>$new_data</span> = <span>$this</span> -> db -> get( <span>$table_name</span> ) -><span> row();
}
</span><span>return</span> <span>$insert_result</span> ? <span>$new_data</span> : <span>false</span><span>;
}
</span><span>private</span> <span>function</span><span> generate_file_id(){
</span><span>do</span><span>{
</span><span>$fid</span> = <span>$this</span> -> salt( 16<span> );
}</span><span>while</span>( <span>$this</span> -> file_id_exist( <span>$fid</span><span> ) );
</span><span>return</span> <span>$fid</span><span>;
}
</span><span>private</span> <span>function</span> salt( <span>$length</span> = 16<span> ){
</span><span>return</span> <span>substr</span>( <span>md5</span>( <span>uniqid</span>( <span>rand</span>(), <span>true</span> ) ), 0, <span>$length</span><span> );
}
</span><span>public</span> <span>function</span> file_id_exist( <span>$fid</span><span> ){
</span><span>if</span>( <span>$this</span>-> db -> query( "SELECT id FROM files WHERE id = '{<span>$fid</span>}'" ) -><span> num_rows() ){
</span><span>return</span> <span>true</span><span>;
}
</span><span>return</span> <span>false</span><span>;
}
</span><span>public</span> <span>function</span> load_children_files( <span>$fid</span><span> ){
</span><span>$mid</span> = <span>$this</span> -> CI -> user -> id % var_get("user_mod"<span>);
</span><span>$table_name</span> = self::table ."_{<span>$mid</span>}"<span>;
</span><span>$this</span> -> db -> where( 'pid', <span>$fid</span><span> );
</span><span>$mysql_result</span> = <span>$this</span> -> db -> get( <span>$table_name</span><span> );
</span><span>return</span> <span>$mysql_result</span> ? <span>$mysql_result</span> -> result() : <span>array</span><span>();
}
}</span>
3.模块定义
3.1希望的写法
1.希望在写对任何一个节点的逻辑操作时，无论增删改查，我都可以先只考虑考虑当前节点。通过抛出事件让自己的模块，或者其他扩展模块来决定要不要进行相应的其他操作。
2.在写任何一个针对文件某一变化（如修改、删除）时，代码不关心只对自己模块内的变化负责。
3.2模块实现
这里我使用CodeIgniter作为基础框架，读者也可以直接自己移植。具体的内容请看注释。
<span>php
</span><span>/*</span><span>*
* @author 侯振宇
* @date 2012-6-26
* @encode UTF-8
</span><span>*/</span>
<span>class</span> File_model <span>extends</span><span> CI_Model{
</span><span>public</span> <span>function</span><span> __construct( ){
parent</span>::<span>__construct( );
</span><span>//</span><span>file factory 包含了和文件相关的类</span>
<span>$this</span> -> load -> library("File_factory"<span>);
}
</span><span>//</span><span>声明本模块需要进行权限验证的接口</span>
<span>public</span> <span>function</span><span> auth(){
</span><span>return</span> <span>array</span><span>(
</span>'main/file_list' => <span>array</span><span>(
</span>'file_owner_validate' => <span>array</span><span>(
</span>'validate' => 'is_operator_file_owner'<span>
)
)</span>,
'main/file_update' => <span>array</span><span>(
</span>'file_owner_validate' => <span>array</span><span>(
</span>'validate' => 'is_operator_file_owner'<span>
)
)
);
}
</span><span>//</span><span>声明模块要监听的事件，可以是内部事件，也可以是外部事件。
//这里监听的都是内部的文件操作的事件，如果修改，增加。为的是分离祖先后者后台的连带操作。</span>
<span>public</span> <span>function</span><span> listen(){
</span><span>return</span> <span>array</span><span>(
</span>"file_update" => "react_file_update",
"file_insert" => "react_file_insert",
"file_remove" => "react_file_remove",<span>
);
}
</span><span>//</span><span>文件更新后 更新父目录的size等属性。</span>
<span>public</span> <span>function</span> react_file_update( <span>$file</span><span> ){
</span><span>//</span><span>size</span>
<span>if</span>( <span>$file</span> -> get_attr_detail("size") -><span> changed ){
</span><span>$size_change_value</span> = <span>$file</span> -> get("size") - <span>$file</span> -> get_attr_detail("size") -><span> last;
</span><span>$ancestors</span> = <span>new</span> File_ancenstors( <span>$file</span>->get("id"<span>) );
</span><span>foreach</span>( <span>$ancestors</span> <span>as</span> &<span>$ancestor</span><span> ){
</span><span>$ancestor</span> -> set( "size", <span>$ancestor</span> -> get("size") + <span>$size_change_value</span><span> );
</span><span>$ancestor</span> -><span> save();
}
}
}
</span><span>//</span><span>文件插入后，更新文件route。当然这个操作你可以在文件新建的时候就写好，这里只是示例。</span>
<span>public</span> <span>function</span> react_file_insert( <span>$file</span><span> ){
</span><span>$pfile</span> = <span>new</span> <span>File</span>( <span>$file</span> -> get("pid"<span>) );
</span><span>$file_route</span> = <span>explode</span>('/', <span>$pfile</span> -> get('route'<span>) );
</span><span>array_push</span>( <span>$file_route</span>, <span>$file</span> -> get("pid"<span>) );
</span><span>$file_route_str</span> = <span>implode</span>('/', <span>array_filter</span>( <span>$file_route</span><span>) );
</span><span>$file</span> -> set("route" , <span>$file_route_str</span>) -><span> save();
}
</span><span>public</span> <span>function</span><span> is_operator_file_owner(){
</span><span>//</span><span>根据自己情况进行判断</span>
<span>return</span> <span>true</span><span>;
}
</span><span>//</span><span>文件的一个列表</span>
<span>public</span> <span>function</span> file_list( <span>$fid</span><span> ){
</span><span>$files</span> = <span>new</span> File_children( <span>$fid</span><span> );
</span><span>return</span> <span>$files</span> -><span> to_array();
}
</span><span>//</span><span>单个文件载入</span>
<span>public</span> <span>function</span> file_load(<span>$fid</span><span>){
</span><span>$file</span> = <span>new</span> <span>File</span>( <span>$fid</span><span> );
</span><span>return</span> <span>$file</span> -><span> to_object();
}
</span><span>//</span><span>某一文件的祖先</span>
<span>public</span> <span>function</span> file_ancestors( <span>$fid</span><span> ){
</span><span>$file_ancenstors</span> = <span>new</span> File_ancenstors( <span>$fid</span><span> );
</span><span>return</span> <span>$file_ancenstors</span> -> ancestors -><span> to_array() ;
}
</span><span>//</span><span>创建文件</span>
<span>public</span> <span>function</span><span> file_new(){
</span><span>//</span><span>测试例子</span>
<span>$file_attrs</span> = <span>array</span><span>(
</span>'name' => "new_test",
'uid' => 151,
'created' => now(),
'pid' => '8a0341838c007cf4',<span>
);
</span><span>$file</span> = <span>new</span> <span>File</span>( <span>$file_attrs</span><span> );
</span><span>$file</span> -><span> save();
</span><span>$this</span> -> event -> trigger("file_insert", <span>$file</span><span> );
</span><span>return</span> <span>$file</span><span>;
}
</span><span>//</span><span>创建文件夹</span>
<span>public</span> <span>function</span> folder_new( <span>$pid</span>, <span>$name</span><span> ){
</span><span>$file_attrs</span> = <span>array</span><span>(
</span>'name' => <span>$name</span>,
'uid' => <span>$this</span> -> user -> id,
'created' => now(),
'pid' => <span>$pid</span>,<span>
);
</span><span>$file</span> = <span>new</span> <span>File</span>( <span>$file_attrs</span><span> );
</span><span>$file</span> -><span> save();
</span><span>$this</span> -> event -> trigger("file_insert", <span>$file</span><span> );
</span><span>return</span> <span>$file</span> -><span> to_object() ;
}
</span><span>//</span><span>文件更新</span>
<span>public</span> <span>function</span> file_update( <span>$fid</span>, <span>$data</span><span> ){
</span><span>$file</span> = <span>new</span> <span>File</span>( <span>$fid</span><span> );
</span><span>$file</span> -> set( <span>$data</span><span> );
</span><span>$file</span> -><span> save();
</span><span>$this</span> -> event -> trigger( "file_update", <span>$file</span><span> );
}
}
</span>?>
总结
事件驱动 相比 模块间通过接口来沟通 的最大好处应该是进一步降低了耦合，同时使系统的逻辑更容易阅读。
希望读者能够仔细阅读代码，能给我提出一些您的宝贵建议。毕竟我不希望我的博客只是放出一个现成的东西，编程让大家测试一下而已。贵在交流。
我有两个项目会基于事件驱动来做，非商业的，开源的，个人觉得还比较好玩。有兴趣参与的请与我联系。留言或者email都可以。谢谢。
陳述：
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