322 lines
44 KiB
HTML
322 lines
44 KiB
HTML
<!DOCTYPE html>
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<html lang="en-us">
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<head>
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<meta charset="UTF-8">
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<title>Redkale - 全新的Java微服务框架</title>
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<meta name="keywords" content="Redkale,redkale,java,微服务,架构"/>
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<meta name="description" content="Redkale是一个全新的基于Java 8的微服务框架"/>
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<link rel="stylesheet" type="text/css" href="stylesheets/normalize.css" media="screen">
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<link rel="stylesheet" type="text/css" href="stylesheets/stylesheet.css" media="screen">
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<link rel="stylesheet" type="text/css" href="stylesheets/github-light.css" media="screen">
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<link rel="stylesheet" type="text/css" href="stylesheets/highlight.css" media="screen">
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<script>
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var _hmt = _hmt || [];
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(function () {
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var hm = document.createElement("script");
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hm.src = "//hm.baidu.com/hm.js?b4e05d7de8b5f3401dd93e3c6b35ffa5";
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var s = document.getElementsByTagName("script")[0];
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s.parentNode.insertBefore(hm, s);
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})();
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</script>
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</head>
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<body>
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<section class="page-header">
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<a href="index.html" class="project-name">Redkale</a>
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<h2 class="project-tagline"></h2>
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<a href="redkale.html" class="btn">Redkale 入门</a>
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<a href="convert.html" class="btn">Convert 组件</a>
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<a href="service.html" class="btn">Service 组件</a>
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<a href="source.html" class="btn">Source 组件</a>
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<a href="net.html" class="btn">Net 组件</a>
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<a href="watch.html" class="btn">Watch 组件</a>
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<a href="articles.html" class="btn">技术文章</a>
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<a href="code.html" class="btn">Java 源码</a>
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</section>
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<section class="main-content">
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<h3><a id="service_intro" class="anchor" href="#" aria-hidden="true"></a>Service 组件介绍</h3>
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<p> Service 是Redkale最核心的组件，依赖于Convert、SNCP协议、Resource依赖注入。Service主要处理业务逻辑和操作数据层，是微服务架构中的单一原子服务。每一个Service实例分两种模式: <b>本地模式</b>和<b>远程模式</b>。其模式由 conf/application.xml 文件来配置。使用者在调用过程中通常不需要区分当前Service实例是哪种模式。<br/>
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为了能确保本地模式与远程模式自由切换，对Service的实现类有一定的约束: <br/>
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1、Service实现类会被继承，不能修饰为 <b>final</b> <br/>
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2、带@MultiRun注解的方法会被重载，不能修饰为 <b>final</b> <br/>
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Redkale进程启动时扫描可加载的Service实现类，根据配置文件配置的模式采用JDK 8内置的ASM技术动态生成相应的Service临时类进行实例化，并注册到ResourceFactory同其他Service、Servlet依赖注入。
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</p>
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<h3><a id="service_local" class="anchor" href="#" aria-hidden="true"></a>Service 本地模式</h3>
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<p> 以一个简单的UserService类范例来说明动态生成的两种模式临时类。UserService提供查询用户、注册、登陆、修改用户名功能:</br></p>
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<div class="highlight"><pre><span class="kd">public</span> <span class="kd">class</span> <span class="nc">UserService</span> <span class="kd">implements</span> <span class="n">Service</span> <span class="o">{</span>
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<span class="c1">//用户简单信息缓存</span>
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<span class="kd">private</span> <span class="kd">final</span> <span class="n">Map</span><span class="o"><</span><span class="n">Integer</span><span class="o">,</span> <span class="n">UserInfo</span><span class="o">></span> <span class="n">users</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ConcurrentHashMap</span><span class="o"><>();</span>
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<span class="c1">//存放手机号码与userid的对应关系</span>
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<span class="kd">private</span> <span class="kd">final</span> <span class="n">Map</span><span class="o"><</span><span class="n">Long</span><span class="o">,</span> <span class="n">Integer</span><span class="o">></span> <span class="n">mobileToUserids</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ConcurrentHashMap</span><span class="o"><>();</span>
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<span class="kd">public</span> <span class="kd">final</span> <span class="n">String</span> <span class="nf">testLocalNodeName</span><span class="o">()</span> <span class="o">{</span>
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<span class="k">return</span> <span class="s">"本地节点名"</span><span class="o">;</span>
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<span class="o">}</span>
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<span class="c1">//查询用户信息</span>
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<span class="kd">public</span> <span class="n">UserInfo</span> <span class="nf">findUserInfo</span><span class="o">(</span><span class="kt">int</span> <span class="n">userid</span><span class="o">)</span> <span class="o">{</span>
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<span class="k">return</span> <span class="n">users</span><span class="o">.</span><span class="na">get</span><span class="o">(</span><span class="n">userid</span><span class="o">);</span>
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<span class="o">}</span>
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<span class="c1">//根据手机号码查询用户ID，没有返回0</span>
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<span class="kd">public</span> <span class="kt">int</span> <span class="nf">findUserid</span><span class="o">(</span><span class="kt">long</span> <span class="n">mobile</span><span class="o">)</span> <span class="o">{</span>
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<span class="n">Integer</span> <span class="n">rs</span> <span class="o">=</span> <span class="n">mobileToUserids</span><span class="o">.</span><span class="na">get</span><span class="o">(</span><span class="n">mobile</span><span class="o">);</span>
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<span class="k">return</span> <span class="n">rs</span> <span class="o">==</span> <span class="kc">null</span> <span class="o">?</span> <span class="mi">0</span> <span class="o">:</span> <span class="n">rs</span><span class="o">;</span>
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<span class="o">}</span>
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<span class="c1">//缓存用户信息</span>
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<span class="kd">public</span> <span class="kt">void</span> <span class="nf">putUserInfo</span><span class="o">(</span><span class="n">UserInfo</span> <span class="n">user</span><span class="o">)</span> <span class="o">{</span>
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<span class="n">users</span><span class="o">.</span><span class="na">put</span><span class="o">(</span><span class="n">user</span><span class="o">.</span><span class="na">getUserid</span><span class="o">(),</span> <span class="n">user</span><span class="o">);</span>
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<span class="k">if</span> <span class="o">(</span><span class="n">user</span><span class="o">.</span><span class="na">getMobile</span><span class="o">()</span> <span class="o">></span> <span class="mi">0</span><span class="o">)</span> <span class="n">mobileToUserids</span><span class="o">.</span><span class="na">put</span><span class="o">(</span><span class="n">user</span><span class="o">.</span><span class="na">getMobile</span><span class="o">(),</span> <span class="n">user</span><span class="o">.</span><span class="na">getUserid</span><span class="o">());</span>
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<span class="o">}</span>
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<span class="c1">//登录</span>
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<span class="kd">public</span> <span class="n">RetResult</span><span class="o"><</span><span class="n">UserInfo</span><span class="o">></span> <span class="nf">login</span><span class="o">(</span><span class="n">LoginBean</span> <span class="n">bean</span><span class="o">)</span> <span class="o">{</span>
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<span class="c1">// 登陆逻辑</span>
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<span class="k">return</span> <span class="k">new</span> <span class="n">RetResult</span><span class="o"><>(</span><span class="mi">100</span><span class="o">);</span>
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<span class="o">}</span>
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<span class="c1">//注册</span>
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<span class="nd">@MultiRun</span>
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<span class="kd">public</span> <span class="kt">void</span> <span class="nf">register</span><span class="o">(</span><span class="n">UserInfo</span> <span class="n">user</span><span class="o">)</span> <span class="o">{</span>
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<span class="k">this</span><span class="o">.</span><span class="na">users</span><span class="o">.</span><span class="na">put</span><span class="o">(</span><span class="n">user</span><span class="o">.</span><span class="na">getUserid</span><span class="o">(),</span> <span class="n">user</span><span class="o">);</span>
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<span class="o">}</span>
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<span class="c1">//更新用户名</span>
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<span class="nd">@MultiRun</span><span class="o">(</span><span class="n">diffrun</span> <span class="o">=</span> <span class="kc">false</span><span class="o">)</span>
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<span class="kd">public</span> <span class="n">UserInfo</span> <span class="nf">updateUsername</span><span class="o">(</span><span class="kt">int</span> <span class="n">userid</span><span class="o">,</span> <span class="n">String</span> <span class="n">username</span><span class="o">)</span> <span class="o">{</span>
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<span class="n">UserInfo</span> <span class="n">user</span> <span class="o">=</span> <span class="k">this</span><span class="o">.</span><span class="na">users</span><span class="o">.</span><span class="na">get</span><span class="o">(</span><span class="n">userid</span><span class="o">);</span>
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<span class="k">if</span> <span class="o">(</span><span class="n">user</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="n">user</span><span class="o">.</span><span class="na">setUsername</span><span class="o">(</span><span class="n">username</span><span class="o">);</span>
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<span class="k">return</span> <span class="n">user</span><span class="o">;</span>
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<span class="o">}</span>
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<span class="o">}</span>
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</pre></div>
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<p> 动态生成的本地模式UserService：</p>
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<div class="highlight"><pre><span class="nd">@Resource</span><span class="o">(</span><span class="n">name</span> <span class="o">=</span> <span class="s">""</span><span class="o">)</span>
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<span class="nd">@SncpDyn</span><span class="o">(</span><span class="n">remote</span> <span class="o">=</span> <span class="kc">false</span><span class="o">)</span>
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<span class="nd">@ResourceType</span><span class="o">({</span><span class="n">UserService</span><span class="o">.</span><span class="kd">class</span><span class="o">})</span>
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<span class="kd">public</span> <span class="kd">final</span> <span class="kd">class</span> <span class="nc">_DynLocalUserService</span> <span class="kd">extends</span> <span class="n">UserService</span> <span class="o">{</span>
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<span class="nd">@Resource</span>
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<span class="kd">private</span> <span class="n">BsonConvert</span> <span class="n">_convert</span><span class="o">;</span>
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<span class="kd">private</span> <span class="n">Transport</span> <span class="n">_sameGroupTransport</span><span class="o">;</span>
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<span class="kd">private</span> <span class="n">Transport</span><span class="o">[]</span> <span class="n">_diffGroupTransports</span><span class="o">;</span>
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<span class="kd">private</span> <span class="n">SncpClient</span> <span class="n">_client</span><span class="o">;</span>
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<span class="kd">private</span> <span class="n">String</span> <span class="n">_selfstring</span><span class="o">;</span>
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<span class="nd">@Override</span>
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<span class="kd">public</span> <span class="n">String</span> <span class="nf">toString</span><span class="o">()</span> <span class="o">{</span>
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<span class="k">return</span> <span class="n">_selfstring</span> <span class="o">==</span> <span class="kc">null</span> <span class="o">?</span> <span class="kd">super</span><span class="o">.</span><span class="na">toString</span><span class="o">()</span> <span class="o">:</span> <span class="n">_selfstring</span><span class="o">;</span>
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<span class="o">}</span>
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<span class="nd">@Override</span>
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<span class="kd">public</span> <span class="kt">void</span> <span class="nf">register</span><span class="o">(</span><span class="n">UserInfo</span> <span class="n">user</span><span class="o">)</span> <span class="o">{</span>
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<span class="kd">this</span><span class="o">.</span><span class="na">_register</span><span class="o">(</span><span class="kc">true</span><span class="o">,</span> <span class="kc">true</span><span class="o">,</span> <span class="kc">true</span><span class="o">,</span> <span class="n">user</span><span class="o">);</span>
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<span class="o">}</span>
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<span class="nd">@SncpDyn</span><span class="o">(</span><span class="n">remote</span> <span class="o">=</span> <span class="kc">false</span><span class="o">,</span> <span class="n">index</span> <span class="o">=</span> <span class="mi">0</span><span class="o">)</span>
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<span class="kd">public</span> <span class="kt">void</span> <span class="nf">_register</span><span class="o">(</span><span class="kt">boolean</span> <span class="n">selfrunnable</span><span class="o">,</span> <span class="kt">boolean</span> <span class="n">samerunnable</span><span class="o">,</span> <span class="kt">boolean</span> <span class="n">diffrunnable</span><span class="o">,</span> <span class="n">UserInfo</span> <span class="n">user</span><span class="o">)</span> <span class="o">{</span>
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<span class="k">if</span> <span class="o">(</span><span class="n">selfrunnable</span><span class="o">)</span> <span class="kd">super</span><span class="o">.</span><span class="na">register</span><span class="o">(</span><span class="n">user</span><span class="o">);</span>
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<span class="k">if</span> <span class="o">(</span><span class="n">_client</span> <span class="o">==</span> <span class="kc">null</span><span class="o">)</span> <span class="k">return</span><span class="o">;</span>
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<span class="k">if</span> <span class="o">(</span><span class="n">samerunnable</span><span class="o">)</span> <span class="n">_client</span><span class="o">.</span><span class="na">remoteSameGroup</span><span class="o">(</span><span class="n">_convert</span><span class="o">,</span> <span class="n">_sameGroupTransport</span><span class="o">,</span> <span class="mi">0</span><span class="o">,</span> <span class="kc">true</span><span class="o">,</span> <span class="kc">false</span><span class="o">,</span> <span class="kc">false</span><span class="o">,</span> <span class="n">user</span><span class="o">);</span>
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<span class="k">if</span> <span class="o">(</span><span class="n">diffrunnable</span><span class="o">)</span> <span class="n">_client</span><span class="o">.</span><span class="na">remoteDiffGroup</span><span class="o">(</span><span class="n">_convert</span><span class="o">,</span> <span class="n">_diffGroupTransports</span><span class="o">,</span> <span class="mi">0</span><span class="o">,</span> <span class="kc">true</span><span class="o">,</span> <span class="kc">true</span><span class="o">,</span> <span class="kc">false</span><span class="o">,</span> <span class="n">user</span><span class="o">);</span>
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<span class="o">}</span>
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<span class="nd">@Override</span>
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<span class="kd">public</span> <span class="n">UserInfo</span> <span class="nf">updateUsername</span><span class="o">(</span><span class="kt">int</span> <span class="n">userid</span><span class="o">,</span> <span class="n">String</span> <span class="n">username</span><span class="o">)</span> <span class="o">{</span>
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<span class="k">return</span> <span class="kd">this</span><span class="o">.</span><span class="na">_updateUsername</span><span class="o">(</span><span class="kc">true</span><span class="o">,</span> <span class="kc">true</span><span class="o">,</span> <span class="kc">false</span><span class="o">,</span> <span class="n">userid</span><span class="o">,</span> <span class="n">username</span><span class="o">);</span>
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<span class="o">}</span>
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<span class="nd">@SncpDyn</span><span class="o">(</span><span class="n">remote</span> <span class="o">=</span> <span class="kc">false</span><span class="o">,</span> <span class="n">index</span> <span class="o">=</span> <span class="mi">1</span><span class="o">)</span>
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<span class="kd">public</span> <span class="n">UserInfo</span> <span class="nf">_updateUsername</span><span class="o">(</span><span class="kt">boolean</span> <span class="n">selfrunnable</span><span class="o">,</span> <span class="kt">boolean</span> <span class="n">samerunnable</span><span class="o">,</span> <span class="kt">boolean</span> <span class="n">diffrunnable</span><span class="o">,</span> <span class="kt">int</span> <span class="n">userid</span><span class="o">,</span> <span class="n">String</span> <span class="n">username</span><span class="o">)</span> <span class="o">{</span>
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<span class="n">UserInfo</span> <span class="n">rs</span> <span class="o">=</span> <span class="kd">super</span><span class="o">.</span><span class="na">updateUsername</span><span class="o">(</span><span class="n">userid</span><span class="o">,</span> <span class="n">username</span><span class="o">);</span>
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<span class="k">if</span> <span class="o">(</span><span class="n">_client</span> <span class="o">==</span> <span class="kc">null</span><span class="o">)</span> <span class="k">return</span> <span class="kc">null</span><span class="o">;</span>
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<span class="k">if</span> <span class="o">(</span><span class="n">samerunnable</span><span class="o">)</span> <span class="n">_client</span><span class="o">.</span><span class="na">remoteSameGroup</span><span class="o">(</span><span class="n">_convert</span><span class="o">,</span> <span class="n">_sameGroupTransport</span><span class="o">,</span> <span class="mi">1</span><span class="o">,</span> <span class="kc">true</span><span class="o">,</span> <span class="kc">false</span><span class="o">,</span> <span class="kc">false</span><span class="o">,</span> <span class="n">userid</span><span class="o">,</span> <span class="n">username</span><span class="o">);</span>
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<span class="k">if</span> <span class="o">(</span><span class="n">diffrunnable</span><span class="o">)</span> <span class="n">_client</span><span class="o">.</span><span class="na">remoteDiffGroup</span><span class="o">(</span><span class="n">_convert</span><span class="o">,</span> <span class="n">_diffGroupTransports</span><span class="o">,</span> <span class="mi">1</span><span class="o">,</span> <span class="kc">true</span><span class="o">,</span> <span class="kc">true</span><span class="o">,</span> <span class="kc">false</span><span class="o">,</span> <span class="n">userid</span><span class="o">,</span> <span class="n">username</span><span class="o">);</span>
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<span class="k">return</span> <span class="n">rs</span><span class="o">;</span>
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<span class="o">}</span>
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<span class="o">}</span>
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</pre></div>
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<p> 由以上等价的代码可以看出来，本地模式Service会重载被@MultiRun注解的方法。@MultiRun有以下几个参数: </p>
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<div class="highlight"><pre><span class="kd">public</span> <span class="nd">@interface</span> <span class="n">MultiRun</span> <span class="o">{</span>
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<span class="kt">boolean</span> <span class="nf">selfrun</span><span class="o">()</span> <span class="k">default</span> <span class="kc">true</span><span class="o">;</span> <span class="c1">//当前本地实例是否运行指定操作；只有当指定操作的方法的返回值为void时，该值才能为true，否则忽略。</span>
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<span class="kt">boolean</span> <span class="nf">samerun</span><span class="o">()</span> <span class="k">default</span> <span class="kc">true</span><span class="o">;</span> <span class="c1">//是否同组节点运行指定操作</span>
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<span class="kt">boolean</span> <span class="nf">diffrun</span><span class="o">()</span> <span class="k">default</span> <span class="kc">true</span><span class="o">;</span> <span class="c1">//是否不同组节点运行指定操作</span>
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<span class="kt">boolean</span> <span class="nf">async</span><span class="o">()</span> <span class="k">default</span> <span class="kc">true</span><span class="o">;</span> <span class="c1">//分布式运行是否采用异步模式</span>
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<span class="o">}</span> </pre></div>
|
||
<p> 在动态生成的远程模式UserService时会根据不同参数生成相应的方法。若一个Service类没有含@MultiRun注解的方法，那么动态类只会重载toString方法。当UserService服务仅需要部署一个进程，由于没有其他等同服务的进程因此在UserService实例化时_client会赋值为null。</p>
|
||
<div class="highlight"><pre><span class="nt"><resources></span>
|
||
<span class="nt"><group</span> <span class="na">name=</span><span class="s">"GROUP-A"</span><span class="nt">></span>
|
||
<span class="nt"><node</span> <span class="na">addr=</span><span class="s">"192.168.10.111"</span> <span class="na">port=</span><span class="s">"7070"</span><span class="nt">/></span>
|
||
<span class="nt"><node</span> <span class="na">addr=</span><span class="s">"192.168.10.112"</span> <span class="na">port=</span><span class="s">"7070"</span><span class="nt">/></span>
|
||
<span class="nt"><node</span> <span class="na">addr=</span><span class="s">"192.168.10.113"</span> <span class="na">port=</span><span class="s">"7070"</span><span class="nt">/></span>
|
||
<span class="nt"></group></span>
|
||
<span class="nt"><group</span> <span class="na">name=</span><span class="s">"GROUP-B"</span><span class="nt">></span>
|
||
<span class="nt"><node</span> <span class="na">addr=</span><span class="s">"192.168.20.121"</span> <span class="na">port=</span><span class="s">"7070"</span><span class="nt">/></span>
|
||
<span class="nt"><node</span> <span class="na">addr=</span><span class="s">"192.168.20.122"</span> <span class="na">port=</span><span class="s">"7070"</span><span class="nt">/></span>
|
||
<span class="nt"></group></span>
|
||
<span class="nt"><group</span> <span class="na">name=</span><span class="s">"GROUP-C"</span><span class="nt">></span>
|
||
<span class="nt"><node</span> <span class="na">addr=</span><span class="s">"192.168.30.131"</span> <span class="na">port=</span><span class="s">"7070"</span><span class="nt">/></span>
|
||
<span class="nt"><node</span> <span class="na">addr=</span><span class="s">"192.168.30.132"</span> <span class="na">port=</span><span class="s">"7070"</span><span class="nt">/></span>
|
||
<span class="nt"></group></span>
|
||
<span class="nt"></resources></span>
|
||
|
||
|
||
<span class="c"><!-- 配置UserService的节点组 ---></span>
|
||
<span class="nt"><service</span> <span class="na">name=</span><span class="s">""</span> <span class="na">value=</span><span class="s">"org.redkale.demo.user.UserService"</span> <span class="na">groups=</span><span class="s">"GROUP-A;GROUP-B;GROUP-C"</span><span class="nt">/></span>
|
||
</pre></div>
|
||
<p> 如上配置，若当前进程所在IP是192.168.10.111，则UserService采用本地模式加载。执行register方法时， 先本地执行超类的register，然后远程执行同组的进程(192.168.10.112、192.168.10.113)，最后远程执行异组的进程(192.168.20.121、192.168.20.122、192.168.30.131、192.168.30.132)。若当前进程所在IP是192.168.10.100，则UserService采用远程模式加载。需要注意的一点是，每个IP所在的服务必须开通SNCP协议服务以便能接收远程的调用请求。</p>
|
||
|
||
<h3><a id="service_remote" class="anchor" href="#" aria-hidden="true"></a>Service 远程模式</h3>
|
||
<p> 动态生成的远程模式UserService：</p>
|
||
<div class="highlight"><pre><span class="nd">@Resource</span><span class="o">(</span><span class="n">name</span> <span class="o">=</span> <span class="s">""</span><span class="o">)</span>
|
||
<span class="nd">@SncpDyn</span><span class="o">(</span><span class="n">remote</span> <span class="o">=</span> <span class="kc">true</span><span class="o">)</span>
|
||
<span class="nd">@ResourceType</span><span class="o">({</span><span class="n">UserService</span><span class="o">.</span><span class="na">class</span><span class="o">})</span>
|
||
<span class="kd">public</span> <span class="kd">final</span> <span class="kd">class</span> <span class="nc">_DynRemoteUserService</span> <span class="kd">extends</span> <span class="n">UserService</span> <span class="o">{</span>
|
||
|
||
<span class="nd">@Resource</span>
|
||
<span class="kd">private</span> <span class="n">BsonConvert</span> <span class="n">_convert</span><span class="o">;</span>
|
||
|
||
<span class="kd">private</span> <span class="n">Transport</span> <span class="n">_transport</span><span class="o">;</span>
|
||
|
||
<span class="kd">private</span> <span class="n">SncpClient</span> <span class="n">_client</span><span class="o">;</span>
|
||
|
||
<span class="kd">private</span> <span class="n">String</span> <span class="n">_selfstring</span><span class="o">;</span>
|
||
|
||
<span class="nd">@Override</span>
|
||
<span class="kd">public</span> <span class="n">String</span> <span class="nf">toString</span><span class="o">()</span> <span class="o">{</span>
|
||
<span class="k">return</span> <span class="n">_selfstring</span> <span class="o">==</span> <span class="kc">null</span> <span class="o">?</span> <span class="kd">super</span><span class="o">.</span><span class="na">toString</span><span class="o">()</span> <span class="o">:</span> <span class="n">_selfstring</span><span class="o">;</span>
|
||
<span class="o">}</span>
|
||
|
||
<span class="nd">@SncpDyn</span><span class="o">(</span><span class="n">remote</span> <span class="o">=</span> <span class="kc">false</span><span class="o">,</span> <span class="n">index</span> <span class="o">=</span> <span class="mi">0</span><span class="o">)</span>
|
||
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">_register</span><span class="o">(</span><span class="kt">boolean</span> <span class="n">selfrunnable</span><span class="o">,</span> <span class="kt">boolean</span> <span class="n">samerunnable</span><span class="o">,</span> <span class="kt">boolean</span> <span class="n">diffrunnable</span><span class="o">,</span> <span class="n">UserInfo</span> <span class="n">user</span><span class="o">)</span> <span class="o">{</span>
|
||
<span class="n">_client</span><span class="o">.</span><span class="na">remote</span><span class="o">(</span><span class="n">_convert</span><span class="o">,</span> <span class="n">_transport</span><span class="o">,</span> <span class="mi">0</span><span class="o">,</span> <span class="n">selfrunnable</span><span class="o">,</span> <span class="n">samerunnable</span><span class="o">,</span> <span class="n">diffrunnable</span><span class="o">,</span> <span class="n">user</span><span class="o">);</span>
|
||
<span class="o">}</span>
|
||
|
||
<span class="nd">@SncpDyn</span><span class="o">(</span><span class="n">remote</span> <span class="o">=</span> <span class="kc">false</span><span class="o">,</span> <span class="n">index</span> <span class="o">=</span> <span class="mi">1</span><span class="o">)</span>
|
||
<span class="kd">public</span> <span class="n">UserInfo</span> <span class="nf">_updateUsername</span><span class="o">(</span><span class="kt">boolean</span> <span class="n">selfrunnable</span><span class="o">,</span> <span class="kt">boolean</span> <span class="n">samerunnable</span><span class="o">,</span> <span class="kt">boolean</span> <span class="n">diffrunnable</span><span class="o">,</span> <span class="kt">int</span> <span class="n">userid</span><span class="o">,</span> <span class="n">String</span> <span class="n">username</span><span class="o">)</span> <span class="o">{</span>
|
||
<span class="k">return</span> <span class="n">_client</span><span class="o">.</span><span class="na">remote</span><span class="o">(</span><span class="n">_convert</span><span class="o">,</span> <span class="n">_transport</span><span class="o">,</span> <span class="mi">1</span><span class="o">,</span> <span class="n">selfrunnable</span><span class="o">,</span> <span class="n">samerunnable</span><span class="o">,</span> <span class="n">diffrunnable</span><span class="o">,</span> <span class="n">userid</span><span class="o">,</span> <span class="n">username</span><span class="o">);</span>
|
||
<span class="o">}</span>
|
||
|
||
<span class="nd">@Override</span>
|
||
<span class="kd">public</span> <span class="n">UserInfo</span> <span class="nf">findUserInfo</span><span class="o">(</span><span class="kt">int</span> <span class="n">userid</span><span class="o">)</span> <span class="o">{</span>
|
||
<span class="k">return</span> <span class="n">_client</span><span class="o">.</span><span class="na">remote</span><span class="o">(</span><span class="n">_convert</span><span class="o">,</span> <span class="n">_transport</span><span class="o">,</span> <span class="mi">2</span><span class="o">,</span> <span class="n">userid</span><span class="o">);</span>
|
||
<span class="o">}</span>
|
||
|
||
<span class="nd">@Override</span>
|
||
<span class="kd">public</span> <span class="kt">int</span> <span class="nf">findUserid</span><span class="o">(</span><span class="kt">long</span> <span class="n">mobile</span><span class="o">)</span> <span class="o">{</span>
|
||
<span class="k">return</span> <span class="n">_client</span><span class="o">.</span><span class="na">remote</span><span class="o">(</span><span class="n">_convert</span><span class="o">,</span> <span class="n">_transport</span><span class="o">,</span> <span class="mi">3</span><span class="o">,</span> <span class="n">mobile</span><span class="o">);</span>
|
||
<span class="o">}</span>
|
||
|
||
<span class="nd">@Override</span>
|
||
<span class="kd">public</span> <span class="n">RetResult</span><span class="o"><</span><span class="n">UserInfo</span><span class="o">></span> <span class="nf">login</span><span class="o">(</span><span class="n">LoginBean</span> <span class="n">bean</span><span class="o">)</span> <span class="o">{</span>
|
||
<span class="k">return</span> <span class="n">_client</span><span class="o">.</span><span class="na">remote</span><span class="o">(</span><span class="n">_convert</span><span class="o">,</span> <span class="n">_transport</span><span class="o">,</span> <span class="mi">4</span><span class="o">,</span> <span class="n">bean</span><span class="o">);</span>
|
||
<span class="o">}</span>
|
||
|
||
<span class="nd">@Override</span>
|
||
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">putUserInfo</span><span class="o">(</span><span class="n">UserInfo</span> <span class="n">user</span><span class="o">)</span> <span class="o">{</span>
|
||
<span class="n">_client</span><span class="o">.</span><span class="na">remote</span><span class="o">(</span><span class="n">_convert</span><span class="o">,</span> <span class="n">_transport</span><span class="o">,</span> <span class="mi">5</span><span class="o">,</span> <span class="n">user</span><span class="o">);</span>
|
||
<span class="o">}</span>
|
||
|
||
<span class="nd">@Override</span>
|
||
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">register</span><span class="o">(</span><span class="n">UserInfo</span> <span class="n">user</span><span class="o">)</span> <span class="o">{</span>
|
||
<span class="n">_client</span><span class="o">.</span><span class="na">remote</span><span class="o">(</span><span class="n">_convert</span><span class="o">,</span> <span class="n">_transport</span><span class="o">,</span> <span class="mi">6</span><span class="o">,</span> <span class="n">user</span><span class="o">);</span>
|
||
<span class="o">}</span>
|
||
|
||
<span class="nd">@Override</span>
|
||
<span class="kd">public</span> <span class="n">UserInfo</span> <span class="nf">updateUsername</span><span class="o">(</span><span class="kt">int</span> <span class="n">userid</span><span class="o">,</span> <span class="n">String</span> <span class="n">username</span><span class="o">)</span> <span class="o">{</span>
|
||
<span class="k">return</span> <span class="n">_client</span><span class="o">.</span><span class="na">remote</span><span class="o">(</span><span class="n">_convert</span><span class="o">,</span> <span class="n">_transport</span><span class="o">,</span> <span class="mi">7</span><span class="o">,</span> <span class="n">userid</span><span class="o">,</span> <span class="n">username</span><span class="o">);</span>
|
||
<span class="o">}</span>
|
||
<span class="o">}</span>
|
||
</pre></div>
|
||
<p> 由以上代码可以看出来，远程模式Service是根据本地模式Service临时类动态生成的。远程类执行方法时通过SNCP协议将参数序列化并带上当前方法信息传输到远程服务器上，执行完后将结果流反序列化并返回, 其流程与WebService类似。</p>
|
||
|
||
<p id="service_dyncall"> <b>远程模式的@DynCall回调</b> </p>
|
||
<p> 与WebService的区别除了更具性能的二进制的数据格式，更差异的是远程模式的Service允许修改参数本身的内容。范例如下：</p>
|
||
<div class="highlight"><pre><span class="cm">/**</span>
|
||
<span class="cm"> * 由于该方法在处理过程中修改了参数bean的内容，为了保证本地模式与远程模式的一致性，需要提供@DynCall回调接口</span>
|
||
<span class="cm"> *</span>
|
||
<span class="cm"> * @param bean</span>
|
||
<span class="cm"> * @return</span>
|
||
<span class="cm"> */</span>
|
||
<span class="kd">public</span> <span class="n">RetResult</span><span class="o"><</span><span class="n">UserInfo</span><span class="o">></span> <span class="nf">login</span><span class="o">(</span><span class="nd">@DynCall</span><span class="o">(</span><span class="n">DynCallLoginBeanAttribute</span><span class="o">.</span><span class="k">class</span><span class="o">)</span> <span class="n">LoginBean</span> <span class="n">bean</span><span class="o">)</span> <span class="o">{</span>
|
||
<span class="n">bean</span><span class="o">.</span><span class="na">setLogintime</span><span class="o">(</span><span class="n">System</span><span class="o">.</span><span class="na">currentTimeMillis</span><span class="o">());</span>
|
||
<span class="n">bean</span><span class="o">.</span><span class="na">setSessionid</span><span class="o">(</span><span class="s">"SID"</span> <span class="o">+</span> <span class="n">System</span><span class="o">.</span><span class="na">currentTimeMillis</span><span class="o">());</span>
|
||
<span class="c1">// 登陆逻辑</span>
|
||
<span class="k">return</span> <span class="k">new</span> <span class="n">RetResult</span><span class="o"><>(</span><span class="mi">100</span><span class="o">);</span>
|
||
<span class="o">}</span>
|
||
|
||
|
||
|
||
<span class="cm">/** DynCallLoginBeanAttribute 的实现 **/</span>
|
||
<span class="kd">public</span> <span class="kd">class</span> <span class="nc">DynCallLoginBeanAttribute</span> <span class="kd">implements</span> <span class="n">Attribute</span><span class="o"><</span><span class="n">LoginBean</span><span class="o">,</span> <span class="n">Object</span><span class="o">[]></span> <span class="o">{</span>
|
||
|
||
<span class="nd">@Override</span>
|
||
<span class="kd">public</span> <span class="n">Object</span><span class="o">[]</span> <span class="nf">get</span><span class="o">(</span><span class="n">LoginBean</span> <span class="n">obj</span><span class="o">)</span> <span class="o">{</span>
|
||
<span class="k">return</span> <span class="k">new</span> <span class="n">Object</span><span class="o">[]{</span><span class="n">obj</span><span class="o">.</span><span class="na">getLogintime</span><span class="o">(),</span> <span class="n">obj</span><span class="o">.</span><span class="na">getSessionid</span><span class="o">()};</span>
|
||
<span class="o">}</span>
|
||
|
||
<span class="nd">@Override</span>
|
||
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">set</span><span class="o">(</span><span class="n">LoginBean</span> <span class="n">obj</span><span class="o">,</span> <span class="n">Object</span><span class="o">[]</span> <span class="n">value</span><span class="o">)</span> <span class="o">{</span>
|
||
<span class="n">obj</span><span class="o">.</span><span class="na">setLogintime</span><span class="o">((</span><span class="n">Long</span><span class="o">)</span> <span class="n">value</span><span class="o">[</span><span class="mi">0</span><span class="o">]);</span>
|
||
<span class="n">obj</span><span class="o">.</span><span class="na">setSessionid</span><span class="o">((</span><span class="n">String</span><span class="o">)</span> <span class="n">value</span><span class="o">[</span><span class="mi">1</span><span class="o">]);</span>
|
||
<span class="o">}</span>
|
||
|
||
<span class="nd">@Override</span>
|
||
<span class="kd">public</span> <span class="n">Class</span><span class="o"><?</span> <span class="kd">extends</span> <span class="n">Object</span><span class="o">[]></span> <span class="nf">type</span><span class="o">()</span> <span class="o">{</span>
|
||
<span class="k">return</span> <span class="n">Object</span><span class="o">[].</span><span class="k">class</span><span class="o">;</span> <span class="c1">//</span>
|
||
<span class="o">}</span>
|
||
|
||
<span class="nd">@Override</span>
|
||
<span class="kd">public</span> <span class="n">Class</span><span class="o"><</span><span class="n">LoginBean</span><span class="o">></span> <span class="nf">declaringClass</span><span class="o">()</span> <span class="o">{</span>
|
||
<span class="k">return</span> <span class="n">LoginBean</span><span class="o">.</span><span class="k">class</span><span class="o">;</span> <span class="c1">//</span>
|
||
<span class="o">}</span>
|
||
|
||
<span class="nd">@Override</span>
|
||
<span class="kd">public</span> <span class="n">String</span> <span class="nf">field</span><span class="o">()</span> <span class="o">{</span>
|
||
<span class="k">return</span> <span class="s">""</span><span class="o">;</span> <span class="c1">//可以随意值</span>
|
||
<span class="o">}</span>
|
||
<span class="o">}</span>
|
||
</pre></div>
|
||
<p> 生成远程模式Service时发现参数带有@DynCall注解的方法，在远程调用返回结果时会进行回调处理。</p>
|
||
|
||
<h3><a id="service_async" class="anchor" href="#" aria-hidden="true"></a>Service 异步调用</h3>
|
||
<p> 远程模式不仅对@DynCall注解进行处理，而且对方法含有 <b>java.nio.channels.CompletionHandler</b> 的参数也进行异步特殊处理。异步调用对远程模式非常有意义，可以减少同步方式对当前线程的占用时间。也给Source组件的异步调用提供了基础。</p>
|
||
<div class="highlight"><pre> <span class="nd">@Override</span>
|
||
<span class="kd">public</span> <span class="o"><</span><span class="n">T</span><span class="o">></span> <span class="kt">void</span> <span class="nf">update</span><span class="o">(</span><span class="kd">final</span> <span class="n">CompletionHandler</span><span class="o"><</span><span class="n">Void</span><span class="o">,</span> <span class="n">T</span><span class="o">[]></span> <span class="n">handler</span><span class="o">,</span> <span class="nd">@DynAttachment</span> <span class="kd">final</span> <span class="n">T</span><span class="o">...</span> <span class="n">values</span><span class="o">)</span> <span class="o">{</span>
|
||
<span class="n">source</span><span class="o">.</span><span class="na">update</span><span class="o">(</span><span class="n">values</span><span class="o">);</span>
|
||
<span class="k">if</span> <span class="o">(</span><span class="n">handler</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="n">handler</span><span class="o">.</span><span class="na">completed</span><span class="o">(</span><span class="kc">null</span><span class="o">,</span> <span class="n">values</span><span class="o">);</span>
|
||
<span class="o">}</span></pre></div>
|
||
<p>
|
||
如上图DataSourceService的源码，当DataSource为本地实例时，异步接口(含<b>CompletionHandler</b>参数的)与同步接口执行流程相同。当DataSource为远程模式时，调用异步接口时，通信接口发到远程服务器时CompletionHandler参数的值传<b>null</b>，返回数据后再调用本地的CompletionHandler参数值执行。<br/>
|
||
异步调用方式是提高服务并发性的有效手段，特别是在远程模式Service比较多的情况下效果更明显。以HTTP服务为例，在Tomcat刚刚改版成NIO的时候，网上随处可见都是大谈NIO性能比BIO多好，认为BIO与NIO的不同，是BIO往往会引入多线程，每个连接一个单独的线程；NIO则是使用单线程或者只使用少量的多线程，每个连接共用一个线程。而事实上呢，通常还是通过增加线程数来提高并发量。为什么NIO作用不大呢， 因为一个HTTP动态请求耗时最多的业务逻辑层，IO操作的耗时比重小得多，只有在静态资源请求这种纯IO操作才能体现NIO、AIO(NIO.2)的优势。举例一个很简单的数据查询请求，采用BIO方式耗时（为了方便比较将所耗时间扩大几倍）如下: <br>
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1、服务器TCP连接开始到进入HttpServlet，耗时 10ms <br>
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2、用户态判断和参数验证， 耗时 10ms <br>
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3、调用远程数据源(DataSource)查询数据，耗时 150ms <br>
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4、数据序列化与response的IO输出， 耗时 10ms <br>
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如上描述，一个请求处理耗时 180ms，同时占用一个线程的时间也是 180ms。若换成NIO使IO耗时减少，为了方便计算假设IO耗时为0(当然实际情况是不可能的), 那么步骤1、4的耗时忽略不计，线程的占用时间由180ms变成160ms。 假设数据查询接口IO操作本身耗时也是10ms，那么有140ms是用于等待。若采用DataSource异步接口， 则140ms的等待时间可以释放当前线程资源。虽然整个请求的处理时间还是180ms，但是线程的占用时间却只有20ms。可以看出减少耗时多的步骤的等待时间才能事半功倍，大幅度地提高性能。异步接口的主要作用是远程请求在等待过程中释放当前线程资源。大大减少线程数，也减少大量线程之间的切换消耗。
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