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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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4.主要流程
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4.2.握手及快速重连
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4.3.绑定用户及路由发布
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4.4.解绑用户
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4.5.消息推送
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4.6.Http代理
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5.服务部署
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11.服务端SDK
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<h1 id="服务端SDK">服务端SDK</h1><h2 id="使用方式">1. 使用方式</h2><ol><li><p>添加maven依赖</p><pre><code class="lang-xml"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>dependency</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>groupId</span><span class="token punctuation">></span></span>com.github.mpusher<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>groupId</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>artifactId</span><span class="token punctuation">></span></span>mpush-client<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>artifactId</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>version</span><span class="token punctuation">></span></span>0.0.2<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>version</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>dependency</span><span class="token punctuation">></span></span></code></pre>
<p>​</p></li>
<li><p>在工程<code>resources</code>目录增加配置文件<code>application.conf</code>，并配置<code>zookeeper</code></p><pre><code class="lang-java"> mp<span class="token punctuation">.</span>zk<span class="token punctuation">.</span>namespace<span class="token operator">=</span>mpush
mp<span class="token punctuation">.</span>zk<span class="token punctuation">.</span>server<span class="token operator">-</span>address<span class="token operator">=</span><span class="token string">"127.0.0.1:2181"</span></code></pre>
<p>​</p></li>
<li><p>使用<code>com.mpush.api.push.PushSende.java</code>进行推送，使用其<code>create</code>方法创建服务，<code>start</code>方法启动服务，<code>stop</code>方法停止服务。推送接口定义如下：</p><pre><code class="lang-java"><span class="token keyword">public</span> <span class="token keyword">interface</span> <span class="token class-name">PushSender</span> <span class="token keyword">extends</span> <span class="token class-name">Service</span> <span class="token punctuation">{</span>
<span class="token comment" spellcheck="true">/**
* 创建PushSender实例
*
* @return PushSender
*/</span>
<span class="token keyword">static</span> PushSender <span class="token function">create<span class="token punctuation">(</span></span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> SpiLoader<span class="token punctuation">.</span><span class="token function">load<span class="token punctuation">(</span></span>PusherFactory<span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">get<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment" spellcheck="true">/**
* 推送push消息
*
* @param context 推送参数
* @return FutureTask 可用于同步调用
*/</span>
FutureTask<span class="token operator"><</span>Boolean<span class="token operator">></span> <span class="token function">send<span class="token punctuation">(</span></span>PushContext context<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span></code></pre>
<p>​</p></li></ol>
<h2 id="推送流程">2. 推送流程</h2><h3 id="流程图">2.1. 流程图</h3><p><img src="MPush接消息推送.png"></p><h3 id="流程分析">2.2. 流程分析</h3><ol><li><code>PushSender</code>启动后首先从ZK里获取可用的<code>GatewayServer</code>列表，然后创建相应的<code>Client</code>分别连接到对应的<code>GatewayServer</code>
</li>
<li>当调用<code>send</code>方法去推送时，<code>PushSender</code>首先会通过<code>RemoteRouterManager</code>查询要推送的用户当前所登录的机器IP，然后通过IP选择<code>GatewayServer</code>并通过第1中对应的<code>Client</code>把消息发送到该机器，因为该机器拥有用户的链接。
</li>
<li><code>GatewayServer</code>接收到<code>Client</code>发送过来的消息后，首先通过查询本地路由<code>LocalRouterManager</code>找到用户连接<code>Connection</code>，该链接是连接到<code>ConnectionServer</code>的。
</li>
<li>如果连接存在，<code>ConnectionServer</code>会通过此连接把消息下发到客户端。
</li>
<li>如果推送成功，<code>GatewayServer</code>会发送消息推送成功的消息给<code>PushSender</code>所持有的<code>Client</code>
</li>
<li><code>PushSender</code>收到推送成功消息后，会通过<code>Callback#onSuccess</code>回调调用方，整个推送流程结束。
</li>
<li>如果中间有任何失败则回调<code>Callback#onFailure</code>。
</li>
<li>如果用户不在线则回调<code>Callback#onOffline</code>。
</li>
<li>如果在一定时间内<code>PushSender</code>没有收到<code>GatewayServer</code>响应的消息则推送超时，回调<code>Callback#onTimeout</code>通知调用方。
</li></ol>
<h2 id="源码解读">3. 源码解读</h2><ol><li><p><code>PushSender</code>的实现类为<code>com.mpush.client.push.PushClient.java</code></p></li>
<li><p><code>PushClient</code>使用的是<code>ConnectionRouterManager</code>该类继承自<code>RemoteRouterManager</code>增加了本地缓存可在消息频繁时减轻<code>Redis</code>压力，但会存在一定情况的误判。</p></li>
<li><p><code>com.mpush.client.push.PushRequestBus.java</code>用于维持异步推送任务，线程的调整可通过配置设置，任务的拒绝策略为<strong>在调用线程执行Callback</strong>。具体见<code>DefaultThreadPoolFactory.java</code>。线程池默认配置如下：</p><pre><code class="lang-java">mp<span class="token punctuation">.</span>thread<span class="token punctuation">.</span>pool<span class="token punctuation">.</span>push<span class="token operator">-</span>callback<span class="token operator">=</span><span class="token punctuation">{</span>
min<span class="token operator">:</span><span class="token number">2</span><span class="token comment" spellcheck="true">//核心线程数</span>
max<span class="token operator">:</span><span class="token number">2</span><span class="token comment" spellcheck="true">//最大线程数</span>
queue<span class="token operator">-</span>size<span class="token operator">:</span><span class="token number">0</span><span class="token comment" spellcheck="true">//队列大小</span>
<span class="token punctuation">}</span></code></pre>
<p>​</p></li>
<li><p><code>GatewayClient</code>会根据<code>GatewayServer</code>的运行状态自行调整，如果有<code>GatewayServer</code>宕机对应的<code>Client</code>会及时销毁，如果有新的机器进来，对应<code>Client</code>也会自动创建。具体参见<code>GatewayClientFactory.java</code>。</p><p>​</p></li></ol>
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2016-09-23 19:44:41
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<div id="anchors-navbar"><i class="fa fa-anchor"></i><ul><p><a href="#服务端SDK">服务端SDK</a></p><li><a href="#使用方式">1. 使用方式</a></li><li><a href="#推送流程">2. 推送流程</a></li><ul><li><a href="#流程图">2.1. 流程图</a></li><li><a href="#流程分析">2.2. 流程分析</a></li></ul><li><a href="#源码解读">3. 源码解读</a></li></ul></div><a href="#使用方式" id="goTop"><i class="fa fa-arrow-up"></i></a>
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