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<p>  通过容器获取kernel实例,将request类传入kernel的handle方法,最终返回响应而这是一个极其漫长的过程,因为这个过程将整个框架所需的服务、文件全部初始化完成。</p>
<h4 id="kernel的handle方法"><a href="#kernel的handle方法" class="headerlink" title="kernel的handle方法"></a>kernel的handle方法</h4><p>随着这个方法执行完毕,整体框架的流程基本就完成80%了<br><figure class="highlight php"><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><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//index.php</span></span><br><span class="line">$kernel = $app->make(Illuminate\Contracts\Http\Kernel::class);</span><br><span class="line">$response = $kernel->handle(</span><br><span class="line"> $request = Illuminate\Http\Request::capture()</span><br><span class="line">);</span><br><span class="line"></span><br><span class="line"><span class="comment">//kernel的handle方法</span></span><br><span class="line"><span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">handle</span><span class="params">($request)</span></span></span><br><span class="line"><span class="function"></span>{ <span class="comment">//在此过程中，所有异常都会通过Exceptions 直接抛出</span></span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> $request->enableHttpMethodParameterOverride();</span><br><span class="line"> <span class="comment">//通过发送请求，经路由处理，最终返回response</span></span><br><span class="line"> $response = <span class="keyword">$this</span>->sendRequestThroughRouter($request);</span><br><span class="line"> } <span class="keyword">catch</span> (<span class="keyword">Exception</span> $e) {</span><br><span class="line"> <span class="keyword">$this</span>->reportException($e);</span><br><span class="line"></span><br><span class="line"> $response = <span class="keyword">$this</span>->renderException($request, $e);</span><br><span class="line"> } <span class="keyword">catch</span> (Throwable $e) {</span><br><span class="line"> $e = <span class="keyword">new</span> FatalThrowableError($e);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">$this</span>->reportException($e);</span><br><span class="line"></span><br><span class="line"> $response = <span class="keyword">$this</span>->renderException($request, $e);</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">// 触发'kernel.handled'事件listener,如果存在的话</span></span><br><span class="line"> <span class="keyword">$this</span>->app[<span class="string">'events'</span>]->fire(<span class="string">'kernel.handled'</span>, [$request, $response]);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> $response;</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<h4 id="sendRequestThroughRouter"><a href="#sendRequestThroughRouter" class="headerlink" title="sendRequestThroughRouter"></a>sendRequestThroughRouter</h4><p>重中之重的方法，分两个部分说<br>① $this->bootstrap();<br>① Pipeline管道;<br><figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"> <span class="keyword">protected</span> <span class="function"><span class="keyword">function</span> <span class="title">sendRequestThroughRouter</span><span class="params">($request)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">$this</span>->app->instance(<span class="string">'request'</span>, $request); <span class="comment">//Reuqest 实例加入instances 数组中</span></span><br><span class="line"></span><br><span class="line"> Facade::clearResolvedInstance(<span class="string">'request'</span>); </span><br><span class="line"></span><br><span class="line"> <span class="keyword">$this</span>->bootstrap(); <span class="comment">//关键方法,几乎加载所有服务和文件</span></span><br><span class="line"></span><br><span class="line"> <span class="comment">// 管道类处理request </span></span><br><span class="line"> <span class="keyword">return</span> (<span class="keyword">new</span> Pipeline(<span class="keyword">$this</span>->app))</span><br><span class="line"> ->send($request)</span><br><span class="line"> ->through(<span class="keyword">$this</span>->app->shouldSkipMiddleware() ? [] : <span class="keyword">$this</span>->middleware)</span><br><span class="line"> ->then(<span class="keyword">$this</span>->dispatchToRouter());</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
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