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0.Introduction
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1.系统架构
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2.服务依赖关系
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3.协议
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9.2.MpushClient架构
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<h1 id="MpushClient架构设计">MpushClient架构设计</h1><h2 id="架构图">1. 架构图</h2><p><img src="MpushClient架构图.png"></p><h2 id="说明">2. 说明</h2><ol><li><p><code>MpushClient</code>主要是为Android客户端设计，作为Android底层通信组件</p></li>
<li><p><code>MpushClient</code>实现了所有Mpush的协议，也包加密，压缩等特性</p></li>
<li><p><code>MpushClient</code>对SDK只暴露了3个对象：<code>Client、ClientConfig、ClientListener</code></p></li>
<li><p><code>ClientConfig</code>提供了所有支持对配置设置项，所有的配置都必须使用此对象设置</p></li>
<li><p><code>Client</code>主要暴露一些往服务端上行的方法，常用的有：</p><pre><code class="lang-java"><span class="token keyword">public</span> <span class="token keyword">interface</span> <span class="token class-name">MPushProtocol</span> <span class="token punctuation">{</span>
<span class="token keyword">boolean</span> <span class="token function">healthCheck<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment" spellcheck="true">//健康检查，读写超时检查，发送心跳</span>
<span class="token keyword">void</span> <span class="token function">fastConnect<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment" spellcheck="true">//快速重连</span>
<span class="token keyword">void</span> <span class="token function">handshake<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment" spellcheck="true">//握手交互密钥</span>
<span class="token keyword">void</span> <span class="token function">bindUser<span class="token punctuation">(</span></span>String userId<span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment" spellcheck="true">//绑定用户到链接</span>
<span class="token keyword">void</span> <span class="token function">unbindUser<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment" spellcheck="true">//解绑</span>
Future<span class="token operator"><</span>HttpResponse<span class="token operator">></span> <span class="token function">sendHttp<span class="token punctuation">(</span></span>HttpRequest request<span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment" spellcheck="true">//发送HTTP代理亲求</span>
<span class="token punctuation">}</span></code></pre>
<p>​</p></li>
<li><p>所有服务端下行的消息都直接转交给<code>ClientListener</code>来处理:</p><pre><code class="lang-java"><span class="token keyword">public</span> <span class="token keyword">interface</span> <span class="token class-name">ClientListener</span> <span class="token punctuation">{</span>
<span class="token keyword">void</span> <span class="token function">onConnected<span class="token punctuation">(</span></span>Client client<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">void</span> <span class="token function">onDisConnected<span class="token punctuation">(</span></span>Client client<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">void</span> <span class="token function">onHandshakeOk<span class="token punctuation">(</span></span>Client client<span class="token punctuation">,</span> <span class="token keyword">int</span> heartbeat<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">void</span> <span class="token function">onReceivePush<span class="token punctuation">(</span></span>Client client<span class="token punctuation">,</span> <span class="token keyword">byte</span><span class="token punctuation">[</span><span class="token punctuation">]</span> content<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">void</span> <span class="token function">onKickUser<span class="token punctuation">(</span></span>String deviceId<span class="token punctuation">,</span> String userId<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span></code></pre>
<p>​</p></li>
<li><p>定时发送心跳部分的定时功能，<code>MpushClient</code>没有去实现，因为Android有比<code>Timer</code>更好的实现<code>AlarmManager</code>, 所以定时功能由SDK收到<code>onHandshakeOk</code>事件时去触发。</p></li>
<li><p>内部组件主要有:<code>Connection、PacketReader、PacketWriter、PacketDispatcher、MessageHandler、ExecutorManager、AllotClient</code> 等</p></li>
<li><p><code>Connection</code>负责TCP链接创建、维护、关闭、重连及校验读写超时时间等</p></li>
<li><p><code>AllotClient</code>负责从<code>AllotServer</code>获取最新的MpushServer IP地址列表</p></li>
<li><p><code>PacketReader</code> 负责数据包的解码及沾包、半包的处理，独占一个线程负责消息的读取。</p></li>
<li><p><code>PacketWriter</code>负责数据发送数据内部维护一个只有一个线程的线程池，如果发送失败，会尝试重发直到超时。</p></li>
<li><p><code>PacketReader、PacketWriter</code>内部还分别维护了一个<code>ByteBuf</code>使用的是堆外内存(<code>allocateDirect</code>)该buffer只分配一次后续一直重复使用，<strong>避免反复的分配内存和垃圾回收</strong>，这点对于客户端还是非常有意义的。</p></li>
<li><p><code>PacketDispatcher</code>负责根据<code>Packet</code>的<code>Command</code>把包分发到相应的<code>MessageHander</code>。</p></li>
<li><p><code>MessageHandler</code>主要负责把<code>Packet</code>反序列化为业务<code>Message</code>包括解码和解压，并处理相应的业务逻辑，比如触发下一步的请求，或通知<code>Listener</code>。</p></li>
<li><p><code>ExecutorManager</code>负责整个客户端的线程、线程池的分配和销毁。</p></li></ol>
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