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📝：441 字 | 🕝：1分钟
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<h2 id="前期插件准备"><a href="#前期插件准备" class="headerlink" title="前期插件准备"></a>前期插件准备</h2><ul>
<li>Docker 安装</li>
<li>Docker-compose 安装 (Mac 系统安装 docker 后自带，忽略)</li>
<li>Idea 及 docker 插件<ul>
<li>idea 要求 2019.2.3 + （ 2018.2 版本会有docker 插件 bug 踩坑）</li>
</ul>
</li>
<li>Maven 3+ </li>
</ul>
<h3 id="docker-安装"><a href="#docker-安装" class="headerlink" title="docker 安装"></a>docker 安装</h3><p><a href="https://www.runoob.com/docker/centos-docker-install.html" target="_blank" rel="noopener">https://www.runoob.com/docker/centos-docker-install.html</a></p>
<h3 id="Docker-compose-安装"><a href="#Docker-compose-安装" class="headerlink" title="Docker-compose 安装"></a>Docker-compose 安装</h3><p><a href="https://blog.csdn.net/pushiqiang/article/details/78682323" target="_blank" rel="noopener">https://blog.csdn.net/pushiqiang/article/details/78682323</a></p>
<p>安装成功如下所示：</p>
<p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-10-22-061942.png" alt="image-20191022141941666"></p>
<h4 id="Docker-compose-开启2375端口（需root用户，仅测试环境使用，-7环境已开启）"><a href="#Docker-compose-开启2375端口（需root用户，仅测试环境使用，-7环境已开启）" class="headerlink" title="Docker-compose 开启2375端口（需root用户，仅测试环境使用，.7环境已开启）"></a>Docker-compose 开启2375端口（需root用户，仅测试环境使用，.7环境已开启）</h4><p><a href="https://blog.csdn.net/qq_41639347/article/details/89436269" target="_blank" rel="noopener">https://blog.csdn.net/qq_41639347/article/details/89436269</a></p>
<h3 id="idea-下-docker-插件安装"><a href="#idea-下-docker-插件安装" class="headerlink" title="idea 下 docker 插件安装"></a>idea 下 docker 插件安装</h3><p>安装插件，idea默认会安装</p>
<p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-10-22-112801.png" alt="image-20191022192800871"></p>
<h4 id="插件设置"><a href="#插件设置" class="headerlink" title="插件设置"></a>插件设置</h4><p><strong>Preferences | Build, Execution, Deployment | docker</strong> 下设置</p>
<p>具体设置如下：</p>
<p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-11-06-074629.png" alt="image-20191106154628478"></p>
<p>看到 Connection successful 即为成功</p>
<h2 id="前期项目配置准备"><a href="#前期项目配置准备" class="headerlink" title="前期项目配置准备"></a>前期项目配置准备</h2><h3 id="修改配置："><a href="#修改配置：" class="headerlink" title="修改配置："></a>修改配置：</h3><ul>
<li>application-test.yml - > token-url-list 修改，一般修改为实际ip,勿用回环地址</li>
<li>redis 地址修改，本项目compose 文件中有redis,不使用可注释</li>
<li>MySQL 地址修改</li>
<li><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-10-22-114218.png" alt="image-20191022194217968"></li>
<li><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-10-22-114229.png" alt="image-20191022194228914"></li>
</ul>
<h2 id="使用idea-打镜像至目标docker"><a href="#使用idea-打镜像至目标docker" class="headerlink" title="使用idea 打镜像至目标docker"></a>使用idea 打镜像至目标docker</h2><p>方式：利用docker-compose up 命令，打镜像至docker，若在idea 终端使用该命令，则使用本机docker，若不想查看部署镜像及启动日志，使用 docker-compose up -d</p>
<p>如下所示，本人docker 环境有3个，双击进入docker-compose.yml</p>
<p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-10-22-115134.png" alt="image-20191022195133798"></p>
<p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-10-22-113345.png" alt="image-20191022193344265"></p>
<p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-11-06-074533.png" alt="image-20191106154533029"></p>
<p>点击上图所示箭头，即可将镜像打到不同的docker环境</p>
<p><strong>注：docker 镜像一般较大，会存在网络io,建议留1-2天时间部署调试。</strong></p>
<p>当看到如下内容，说明镜像部署成功,docker-compose会自动拉起容器，并启动</p>
<p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-10-22-113637.png" alt="image-20191022193637390"></p>
<p>也可从docker 插件中查看具体日志：</p>
<p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-10-22-113748.png" alt="image-20191022193748492"></p>
<p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-10-22-113856.png" alt="image-20191022193856232"></p>
<h3 id><a href="#" class="headerlink" title></a><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-10-22-114403.png" alt="image-20191022194402045"></h3><h2 id="总结"><a href="#总结" class="headerlink" title="总结"></a>总结</h2><p><strong>以上方式，适用 docker 集成部署（不使用镜像仓库），但不适用频繁部署，网络io很大(500kb上行速度，部署一个模块20min+)，且代码修改后，需要重新部署镜像。</strong></p>
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<a class="article-title_code_ant" href="/gavin.github.io/2019/09/28/【SpringSecurity】Oauth2协议简介/">【SpringSecurity】Oauth协议简介</a>
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📝：32 字 | 🕝：1分钟
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<h2 id="Oauth协议简介"><a href="#Oauth协议简介" class="headerlink" title="Oauth协议简介"></a>Oauth协议简介</h2><ul>
<li>Oauth协议要解决的问题</li>
<li>Oauth协议中的各种角色</li>
<li>Oauth协议中的运行流程</li>
</ul>
<p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-10-16-022600.png" alt="image-20191016102600293"></p>
<p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-10-16-022616.png" alt="image-20191016102615280"></p>
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<article id="post-【SpringCloud】Springboot 默认的异常处理机制及自定义异常处理机制" class="article article-type-post article-index" itemscope itemprop="blogPost">
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📝：354 字 | 🕝：1分钟
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<h2 id="Springboot-默认异常处理机制"><a href="#Springboot-默认异常处理机制" class="headerlink" title="Springboot 默认异常处理机制"></a>Springboot 默认异常处理机制</h2><h3 id="网页端"><a href="#网页端" class="headerlink" title="网页端"></a>网页端</h3><p>当我们网页端访问时，返回的数据如下：是一个html</p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">html</span>></span><span class="tag"><<span class="name">body</span>></span><span class="tag"><<span class="name">h1</span>></span>Whitelabel Error Page<span class="tag"></<span class="name">h1</span>></span><span class="tag"><<span class="name">p</span>></span>This application has no explicit mapping for /error, so you are seeing this as a fallback.<span class="tag"></<span class="name">p</span>></span><span class="tag"><<span class="name">div</span> <span class="attr">id</span>=<span class="string">'created'</span>></span>Mon Sep 30 16:37:59 CST 2019<span class="tag"></<span class="name">div</span>></span><span class="tag"><<span class="name">div</span>></span>There was an unexpected error (type=Not Found, status=404).<span class="tag"></<span class="name">div</span>></span><span class="tag"><<span class="name">div</span>></span>No message available<span class="tag"></<span class="name">div</span>></span><span class="tag"></<span class="name">body</span>></span><span class="tag"></<span class="name">html</span>></span></span><br></pre></td></tr></table></figure>
<h3 id="App端"><a href="#App端" class="headerlink" title="App端"></a>App端</h3><figure class="highlight json"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">{</span><br><span class="line"> <span class="attr">"timestamp"</span>: <span class="string">"2019-09-30T08:44:14.418+0000"</span>,</span><br><span class="line"> <span class="attr">"status"</span>: <span class="number">404</span>,</span><br><span class="line"> <span class="attr">"error"</span>: <span class="string">"Not Found"</span>,</span><br><span class="line"> <span class="attr">"message"</span>: <span class="string">"No message available"</span>,</span><br><span class="line"> <span class="attr">"path"</span>: <span class="string">"/xxx"</span></span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>访问的是同样的网站，但是是不同的结果，这是为什么呢？</p>
<p>查看请求头</p>
<p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-09-30-085359.png" alt="image-20190930165359406"></p>
<p>查看源码</p>
<p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-09-30-084529.png" alt="image-20190930164528683"></p>
<p>produces= “text/html” 指出返回的具体数据是什么？</p>
<p>查看源码</p>
<p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-09-30-090326.png" alt="image-20190930170326537"></p>
<p>即可以是对返回数据的定义，也可以是对请求头的校验，这样子，就可以路由不同的controller啦。</p>
<h2 id="自定义异常处理机制"><a href="#自定义异常处理机制" class="headerlink" title="自定义异常处理机制"></a>自定义异常处理机制</h2><h3 id="网页端-1"><a href="#网页端-1" class="headerlink" title="网页端"></a>网页端</h3><p>在resources下新建：resources:error ，然后创建404.html 如下：<img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-09-30-085030.png" alt="image-20190930165029910"></p>
<p>点击后，网页展示如下：自定义成功</p>
<p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-09-30-085053.png" alt="image-20190930165053523"></p>
<p>该404页面为腾讯404 公益页面</p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta"><!DOCTYPE html></span></span><br><span class="line"><span class="tag"><<span class="name">html</span> <span class="attr">lang</span>=<span class="string">"en"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">head</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">"UTF-8"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">title</span>></span>404<span class="tag"></<span class="name">title</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">head</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">body</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">script</span> <span class="attr">type</span>=<span class="string">"text/javascript"</span> <span class="attr">src</span>=<span class="string">"//qzonestyle.gtimg.cn/qzone/hybrid/app/404/search_children.js"</span> <span class="attr">charset</span>=<span class="string">"utf-8"</span>></span><span class="tag"></<span class="name">script</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">body</span>></span></span><br><span class="line"><span class="tag"></<span class="name">html</span>></span></span><br></pre></td></tr></table></figure>
<h3 id="App端-1"><a href="#App端-1" class="headerlink" title="App端"></a>App端</h3><p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-09-30-091746.png" alt="image-20190930171746052"></p>
<p>通过该异常处理方式，进行处理</p>
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<article id="post-【SpringCloud】Springboot中的事件发布及事务控制" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<h2 id="事件发布"><a href="#事件发布" class="headerlink" title="事件发布"></a>事件发布</h2><h3 id="事件发布的优点及使用场景"><a href="#事件发布的优点及使用场景" class="headerlink" title="事件发布的优点及使用场景"></a>事件发布的优点及使用场景</h3><ul>
<li>优点<ul>
<li>业务解耦，在不影响原来业务逻辑的情况下，加入其它业务</li>
</ul>
</li>
<li>场景<ul>
<li>app上线后已实现用户注册功能，现需要在用户注册成功后给用户发送短信提示等</li>
</ul>
</li>
</ul>
<h3 id="如何进行事件发布"><a href="#如何进行事件发布" class="headerlink" title="如何进行事件发布"></a>如何进行事件发布</h3><ul>
<li><p>创建消息对象，一般为业务对象</p>
<ul>
<li><p>Student</p>
</li>
<li><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Data</span></span><br><span class="line"><span class="meta">@Builder</span>(toBuilder = <span class="keyword">true</span>)</span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Student</span> </span>{</span><br><span class="line"> </span><br><span class="line"> <span class="keyword">private</span> String id;</span><br><span class="line"> <span class="keyword">private</span> String name;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
</li>
</ul>
</li>
</ul>
<ul>
<li><p>创建事件event</p>
<ul>
<li><p>StudentEvent,该事件用于携带消息对象，进行传播</p>
</li>
<li><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">StudentEvent</span> <span class="keyword">extends</span> <span class="title">ApplicationEvent</span> </span>{</span><br><span class="line"> </span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="title">StudentEvent</span><span class="params">(Student source)</span> </span>{</span><br><span class="line"> <span class="keyword">super</span>(source);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
</li>
</ul>
</li>
</ul>
<ul>
<li><p>创建监听Lisitener</p>
<ul>
<li><p>StudentListener,用于监听StudentEvent，这里进行后续的逻辑处理</p>
</li>
<li><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Component</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">StudentListener</span> </span>{</span><br><span class="line"> </span><br><span class="line"> </span><br><span class="line"> <span class="meta">@Async</span></span><br><span class="line"> <span class="meta">@Order</span></span><br><span class="line"> <span class="meta">@EventListener</span>(StudentEvent.class)</span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">saveSysLog</span><span class="params">(StudentEvent event)</span> </span>{</span><br><span class="line"> </span><br><span class="line"> Student student = (Student) event.getSource();</span><br><span class="line"> System.out.println(<span class="string">"监听到事件啦，现在开始进行异步处理"</span> + student);</span><br><span class="line"> </span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
</li>
</ul>
</li>
</ul>
<ul>
<li><p>在原有业务处，发布事件，进行处理，一行代码，搞定异步逻辑。</p>
<ul>
<li><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@RestController</span>(<span class="string">"student"</span>)</span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">StudentController</span> </span>{</span><br><span class="line"> </span><br><span class="line"> <span class="meta">@Autowired</span></span><br><span class="line"> StudentService service;</span><br><span class="line"> </span><br><span class="line"> <span class="meta">@GetMapping</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">saveStudent</span><span class="params">()</span> </span>{</span><br><span class="line"> </span><br><span class="line"> Student gavin = Student.builder().id(<span class="string">"1"</span>).name(<span class="string">"gavin"</span>).build();</span><br><span class="line"> </span><br><span class="line"> service.saveStudent(gavin);</span><br><span class="line"> </span><br><span class="line"> SpringContextHolder.publishEvent(<span class="keyword">new</span> StudentEvent(gavin));</span><br><span class="line"> </span><br><span class="line"> System.out.println(gavin);</span><br><span class="line"> </span><br><span class="line"> </span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
</li>
</ul>
</li>
</ul>
<h3 id="事件发布的事务控制"><a href="#事件发布的事务控制" class="headerlink" title="事件发布的事务控制"></a>事件发布的事务控制</h3><p>在项目中，往往需要执行数据库操作后，发送消息或事件来异步调用其他组件执行相应的操作，例如：</p>
<p>用户注册后发送激活码；<br>配置修改后发送更新事件等。<br>但是，数据库的操作如果还未完成，此时异步调用的方法查询数据库发现没有数据，这就会出现问题。@TransactionalEventListener注解搞定</p>
<p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-10-03-113200.png" alt="image-20191003193159147"></p>
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<h2 id="RestFul-的拦截机制"><a href="#RestFul-的拦截机制" class="headerlink" title="RestFul 的拦截机制"></a>RestFul 的拦截机制</h2><p>需求：实现接口请求耗时</p>
<h3 id="过滤器"><a href="#过滤器" class="headerlink" title="过滤器"></a>过滤器</h3><p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-10-01-144328.png" alt="image-20191001224327588"></p>
<p>如果加了Component 注解，则对所有的请求路径满足，如果不加，需要注册Bean 然后进行设置</p>
<p><strong>注意：filter只能拿到http 的请求和响应，但是这个filter 是不知道 具体哪个 控制器，哪个方法去处理这个请求;</strong></p>
<p><strong>如果我们需要这些信息的话，那么就需要拦截器去处理了</strong></p>
<h3 id="拦截器"><a href="#拦截器" class="headerlink" title="拦截器"></a>拦截器</h3><p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-10-02-005837.png" alt="image-20191002085836527"></p>
<p>拦截器与filter 不同之处在于，拦截器还需要进行设置，才能起效。</p>
<p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-10-02-005916.png" alt="image-20191002085915905"></p>
<h3 id="切片"><a href="#切片" class="headerlink" title="切片"></a>切片</h3><p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-10-02-021315.png" alt="image-20191002101315087"></p>
<h3 id="启动顺序"><a href="#启动顺序" class="headerlink" title="启动顺序"></a>启动顺序</h3><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-10-02-014538.png" alt="image-20191002094538200" style="zoom:50%;">
<p>其启动顺序如上图所示，最先进入 filter，然后是interceptor，然后是 aspect</p>
<p>其日志如下：</p>
<img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-10-02-021426.png" alt="image-20191002101426277" style="zoom:50%;">
<h3 id="filter，intercepter-aop-的具体区别是什么呢？"><a href="#filter，intercepter-aop-的具体区别是什么呢？" class="headerlink" title="filter，intercepter,aop 的具体区别是什么呢？"></a>filter，intercepter,aop 的具体区别是什么呢？</h3><ul>
<li>filter ，只能拿到request，response的原始的http请求，但是不知道具体是哪个类执行，哪个方法执行</li>
<li>Intercepter ，相比于filter 可以拿到上述哪个类执行，哪个方法执行</li>
<li>aop，可以拿到执行结果，更多的是面向切面的编程思想</li>
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<article id="post-【netty源码笔记】NioEventLoop" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<a class="article-title" href="/gavin.github.io/2019/09/12/【netty源码笔记】NioEventLoop/">【netty源码笔记】(三)NioEventLoop 探究</a>
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<a class="article-title_code_ant" href="/gavin.github.io/2019/09/12/【netty源码笔记】NioEventLoop/">【netty源码笔记】(三)NioEventLoop 探究</a>
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📝：599 字 | 🕝：2分钟
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<h2 id="Questions"><a href="#Questions" class="headerlink" title="Questions"></a>Questions</h2><ul>
<li><p>默认情况下，Netty服务端启动多少线程？何时启动？</p>
</li>
<li><p>如何解决jdk空轮询bug？</p>
</li>
<li><p>Netty如何保证异步串行无锁化？</p>
<ul>
<li>常见场景为拿到一个客户端channel，不需要对这个channel进行同步，直接进行多线程并发读写。</li>
<li>另一个场景为ChannelHandler里的操作都是线程安全的，不需要进行同步。</li>
</ul>
</li>
</ul>
<h2 id="NioEventLoop创建"><a href="#NioEventLoop创建" class="headerlink" title="NioEventLoop创建"></a>NioEventLoop创建</h2><p>NioEventLoopGroup 是 NioEventLoop 的容器，前者提供了生成NioEventLoop的方法和设置io ration以及重建NioEventLoop的方法.</p>
<ul>
<li>赋值，默认是2倍cpu核数</li>
</ul>
<p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-09-11-083333.png" alt="image-20190911163332607"></p>
<ul>
<li><h4 id="创建线程执行器"><a href="#创建线程执行器" class="headerlink" title="创建线程执行器"></a>创建线程执行器</h4></li>
</ul>
<p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-09-11-083645.png" alt="image-20190911163645315"></p>
<ul>
<li>ThreadPerTaskExecutor <ul>
<li>每次执行任务都会创建一个线程实体</li>
<li><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-09-12-023553.png" alt="image-20190912103552770"></li>
<li>NioEventLoop线程命名规则nioEventLoop-1-xx</li>
<li><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-09-12-024045.png" alt="image-20190912104045326"></li>
<li><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-09-12-024116.png" alt="image-20190912104115157"></li>
</ul>
</li>
</ul>
<ul>
<li><h4 id="构造NioEventLoop"><a href="#构造NioEventLoop" class="headerlink" title="构造NioEventLoop"></a>构造NioEventLoop</h4></li>
</ul>
<p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-09-11-083755.png" alt="image-20190911163754956"></p>
<ul>
<li><p>newChild()构造nioEventLoop 最终为一个数组形式</p>
<ul>
<li><p>保存线程执行器</p>
</li>
<li><p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-09-12-025115.png" alt="image-20190912105115006"></p>
</li>
<li><p>创建一个MpscQueue</p>
<ul>
<li>我们发现 <code>taskQueue</code>在NioEventLoop中默认是mpsc队列，mpsc队列，即多生产者单消费者队列，netty使用mpsc，方便的将外部线程的task聚集，在reactor线程内部用单线程来串行执行，我们可以借鉴netty的任务执行模式来处理类似多线程数据上报，定时聚合的应用</li>
</ul>
</li>
<li><p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-09-12-025248.png" alt="image-20190912105248151"></p>
</li>
<li><p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-09-12-030716.png" alt="image-20190912105505357"></p>
</li>
</ul>
</li>
</ul>
<ul>
<li><p>创建一个selector</p>
</li>
<li><p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-09-12-025330.png" alt="image-20190912105329935"></p>
</li>
</ul>
<ul>
<li><h4 id="创建线程选择器"><a href="#创建线程选择器" class="headerlink" title="创建线程选择器"></a>创建线程选择器</h4><ul>
<li>为新连接绑定对应的nioEventLoop</li>
</ul>
</li>
</ul>
<p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-09-11-083821.png" alt="image-20190911163820590"></p>
<ul>
<li>newchooser() 循环取数组下标的一个操作<ul>
<li>判断isPowerOfTwo（）是进行优化，不是不进行优化</li>
<li>优化 （& 是一个二进制操作）</li>
<li><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-09-12-032054.png" alt="image-20190912112053480"></li>
<li>未优化（% 是一个复杂的操作）</li>
<li><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-09-12-032127.png" alt="image-20190912112126642"></li>
</ul>
</li>
</ul>
<h2 id="NioEventLoop启动"><a href="#NioEventLoop启动" class="headerlink" title="NioEventLoop启动"></a>NioEventLoop启动</h2><h4 id="服务端启动绑定端口"><a href="#服务端启动绑定端口" class="headerlink" title="服务端启动绑定端口"></a>服务端启动绑定端口</h4><ul>
<li><p>入口：bind()->execute(task)</p>
</li>
<li><p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-09-12-055922.png" alt="image-20190912135922405"></p>
<ul>
<li>这里的bind() 线程是绑定端口和增加监听器的一个线程</li>
<li><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-09-12-060056.png" alt="image-20190912140055238"></li>
<li>判断执行execute()的线程是否是nioEventLoop的线程，不是则通过Cas方法创建</li>
<li><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-09-12-060301.png" alt="image-20190912140301404"></li>
<li><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-09-12-060357.png" alt="image-20190912140356848"></li>
<li>这里的executor其实就是前文的ThreadPerTaskExecutor</li>
<li>run()方法启动</li>
<li><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-09-12-064953.png" alt="image-20190912144952731"></li>
</ul>
</li>
<li><h4 id="总结"><a href="#总结" class="headerlink" title="总结"></a>总结</h4></li>
</ul>
<p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-09-12-060608.png" alt="image-20190912140608031"></p>
<p>主线程最终调用bind()-> bind()会把实际绑定的流程封装为一个task->调用服务端channel 的execute()具体执行->netty 会判断调用executor的方法是不是nio线程-> 如果不是，调用doStartThread()去创建线程，然后把当前的线程赋值，nioEventLoop 会把当前的线程进行保存，最后调用run()进行启动</p>
<h4 id="新链接接入"><a href="#新链接接入" class="headerlink" title="新链接接入"></a>新链接接入</h4><h2 id="NioEventLoop执行流程"><a href="#NioEventLoop执行流程" class="headerlink" title="NioEventLoop执行流程"></a>NioEventLoop执行流程</h2><p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-09-12-065107.png" alt="image-20190912145107423"></p>
<p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-09-12-065146.png" alt="image-20190912145145589"></p>
<ul>
<li><h3 id="select-检查是否有io事件"><a href="#select-检查是否有io事件" class="headerlink" title="select() 检查是否有io事件"></a>select() 检查是否有io事件</h3><ul>
<li>deadLine以及任务穿插逻辑处理 </li>
<li>阻塞式的select</li>
<li>避免nio Selector空轮询bug</li>
</ul>
</li>
<li><h3 id="processSelectedKeys-处理io事件"><a href="#processSelectedKeys-处理io事件" class="headerlink" title="processSelectedKeys()处理io事件"></a>processSelectedKeys()处理io事件</h3></li>
<li><h3 id="runAllTasks-处理异步任务队列"><a href="#runAllTasks-处理异步任务队列" class="headerlink" title="runAllTasks()处理异步任务队列"></a>runAllTasks()处理异步任务队列</h3></li>
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<article id="post-【netty源码笔记】netty 对 socket 的抽象" class="article article-type-post article-index" itemscope itemprop="blogPost">
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📝：346 字 | 🕝：1分钟
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<p><img src="http://gavin-ipic.oss-cn-beijing.aliyuncs.com/2019-09-11-025838.png" alt="image-20190911105837699"></p>
<center>（摄于2017年11月西安咖啡街区）</center>
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