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<h2 class="post-title" itemprop="name headline">pipeline管道(原理模拟)</h2>
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4
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<h4 id="管道概念"><a href="#管道概念" class="headerlink" title="管道概念"></a>管道概念</h4><p>  当从一个进程连接数据流到另一个进程时,我们使用术语管道。我们通常是把一个进程的输出通过管道连接到另一个进程的输入。通过这些进程(<font color="#f56954">中间件Middleware</font>)的处理后最终返回结果值。这里也有一个高大上的术语:<font color="#f56954">装饰者模式</font><br><img src="/images/pipeline.png"></p>
<h4 id="基本实现"><a href="#基本实现" class="headerlink" title="基本实现"></a>基本实现</h4><p>按照上图，下面是用代码模拟其实现的过程。<br><a id="more"></a><br><figure class="highlight xml"><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><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br></pre></td><td class="code"><pre><span class="line"><span class="php"><span class="meta"><?php</span> </span></span><br><span class="line"><span class="php"><span class="class"><span class="keyword">class</span> <span class="title">Hardwater</span></span></span></span><br><span class="line"><span class="php">{</span></span><br><span class="line"><span class="php"> <span class="keyword">public</span> $contain = [</span></span><br><span class="line"><span class="php"> <span class="string">'sand'</span>=> <span class="keyword">true</span>,</span></span><br><span class="line"><span class="php"> <span class="string">'impurity'</span>=> <span class="keyword">true</span>,</span></span><br><span class="line"><span class="php"> <span class="string">'ion'</span> => [<span class="string">'Mg+'</span>,<span class="string">'Al3+'</span>],</span></span><br><span class="line"><span class="php"> ];</span></span><br><span class="line"><span class="php">}</span></span><br><span class="line"><span class="php"><span class="comment">//滤网,清除沙子</span></span></span><br><span class="line"><span class="php"><span class="class"><span class="keyword">class</span> <span class="title">Sieve</span></span></span></span><br><span class="line"><span class="php">{</span></span><br><span class="line"><span class="php"> <span class="keyword">public</span> <span class="keyword">static</span> <span class="function"><span class="keyword">function</span> <span class="title">handle</span><span class="params">($water)</span></span></span></span><br><span class="line"><span class="php"> {</span></span><br><span class="line"><span class="php"> $water->contain[<span class="string">'sand'</span>] = <span class="keyword">false</span>;</span></span><br><span class="line"><span class="php"></span></span><br><span class="line"><span class="php"> <span class="keyword">return</span> $water;</span></span><br><span class="line"><span class="php"> }</span></span><br><span class="line"><span class="php">}</span></span><br><span class="line"><span class="php"><span class="comment">//明矾,清除细颗粒杂质</span></span></span><br><span class="line"><span class="php"><span class="class"><span class="keyword">class</span> <span class="title">KAlSO4</span></span></span></span><br><span class="line"><span class="php">{</span></span><br><span class="line"><span class="php"> <span class="keyword">public</span> <span class="keyword">static</span> <span class="function"><span class="keyword">function</span> <span class="title">handle</span><span class="params">($water)</span></span></span></span><br><span class="line"><span class="php"> {</span></span><br><span class="line"><span class="php"> $water->contain[<span class="string">'impurity'</span>] = <span class="keyword">false</span>;</span></span><br><span class="line"><span class="php"></span></span><br><span class="line"><span class="php"> <span class="keyword">return</span> $water;</span></span><br><span class="line"><span class="php"> }</span></span><br><span class="line"><span class="php">}</span></span><br><span class="line"><span class="php"><span class="comment">//高温加热</span></span></span><br><span class="line"><span class="php"><span class="class"><span class="keyword">class</span> <span class="title">Heat</span></span></span></span><br><span class="line"><span class="php">{</span></span><br><span class="line"><span class="php"> <span class="keyword">public</span> <span class="keyword">static</span> <span class="function"><span class="keyword">function</span> <span class="title">handle</span><span class="params">($water)</span></span></span></span><br><span class="line"><span class="php"> {</span></span><br><span class="line"><span class="php"> $water->contain[<span class="string">'ion'</span>] = [];</span></span><br><span class="line"><span class="php"></span></span><br><span class="line"><span class="php"> <span class="keyword">return</span> $water;</span></span><br><span class="line"><span class="php"> }</span></span><br><span class="line"><span class="php">}</span></span><br><span class="line"><span class="php">$water = <span class="keyword">new</span> Hardwater;</span></span><br><span class="line"><span class="php"></span></span><br><span class="line"><span class="php">$water = Sieve::handle($water);</span></span><br><span class="line"><span class="php"></span></span><br><span class="line"><span class="php">$water = KAlSO4::handle($water);</span></span><br><span class="line"><span class="php"></span></span><br><span class="line"><span class="php">$softWater = Heat::handle($water);</span></span><br><span class="line"><span class="php"></span></span><br><span class="line"><span class="php"><span class="comment">//变形一下</span></span></span><br><span class="line"><span class="php">$softWater = Heat::handle(</span></span><br><span class="line"><span class="php"> KAlSO4::handle(</span></span><br><span class="line"><span class="php"> Sieve::handle($water)</span></span><br><span class="line"><span class="php"> )</span></span><br><span class="line"><span class="php"> );</span></span><br></pre></td></tr></table></figure></p>
<h4 id="嵌套闭包实现"><a href="#嵌套闭包实现" class="headerlink" title="嵌套闭包实现"></a>嵌套闭包实现</h4><p>这块需要理解通过array_reduce，生成最终pipeline函数的过程。重在实际操作。<br><blockquote><footer><strong>array_reduce</strong><cite><a href="http://php.net/manual/zh/function.array-reduce.php" target="_blank" rel="noopener">php.net/manual/zh/function.array-reduce.php</a></cite></footer></blockquote><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><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">hardWater</span></span></span><br><span class="line"><span class="class"></span>{</span><br><span class="line"> <span class="keyword">public</span> $contain = [</span><br><span class="line"> <span class="string">'sand'</span>=> <span class="keyword">true</span>,</span><br><span class="line"> <span class="string">'impurity'</span>=> <span class="keyword">true</span>,</span><br><span class="line"> <span class="string">'ion'</span> => [<span class="string">'Mg+'</span>,<span class="string">'Al3+'</span>],</span><br><span class="line"> ];</span><br><span class="line">}</span><br><span class="line"><span class="comment">//滤网,清除沙子</span></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Sieve</span></span></span><br><span class="line"><span class="class"></span>{</span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> <span class="function"><span class="keyword">function</span> <span class="title">handle</span><span class="params">($water,Closure $next)</span></span></span><br><span class="line"><span class="function"> </span>{ </span><br><span class="line"> <span class="keyword">echo</span> <span class="string">"沙子处理<br>"</span>;</span><br><span class="line"> $water->contain[<span class="string">'sand'</span>] = <span class="keyword">null</span>;</span><br><span class="line"></span><br><span class="line"> $softWater = $next($water);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">echo</span> <span class="string">"沙子过滤完毕<br>"</span>;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> $softWater;</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"><span class="comment">//明矾,清除细颗粒杂质</span></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">KAlSO4</span></span></span><br><span class="line"><span class="class"></span>{</span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> <span class="function"><span class="keyword">function</span> <span class="title">handle</span><span class="params">($water,Closure $next)</span></span></span><br><span class="line"><span class="function"> </span>{ </span><br><span class="line"> <span class="keyword">echo</span> <span class="string">"明矾处理<br>"</span>;</span><br><span class="line"> $water->contain[<span class="string">'impurity'</span>] = <span class="keyword">null</span>;</span><br><span class="line"></span><br><span class="line"> $softWater = $next($water);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">echo</span> <span class="string">"杂质过滤完毕<br>"</span>;</span><br><span class="line"> <span class="keyword">return</span> $softWater;</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"><span class="comment">//高温加热</span></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Heat</span></span></span><br><span class="line"><span class="class"></span>{</span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> <span class="function"><span class="keyword">function</span> <span class="title">handle</span><span class="params">($water,Closure $next)</span></span></span><br><span class="line"><span class="function"> </span>{ </span><br><span class="line"> <span class="keyword">echo</span> <span class="string">"加热处理<br>"</span>;</span><br><span class="line"> $water->contain[<span class="string">'ion'</span>] = <span class="keyword">null</span>;</span><br><span class="line"> $softWater = $next($water);</span><br><span class="line"> <span class="keyword">echo</span> <span class="string">"离子过滤完毕<br>"</span>;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> $softWater;</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">getSlice</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>{ </span><br><span class="line"> <span class="keyword">return</span> <span class="function"><span class="keyword">function</span> <span class="params">($stack,$pipe)</span></span></span><br><span class="line"><span class="function"> </span>{</span><br><span class="line"> <span class="keyword">return</span> <span class="function"><span class="keyword">function</span><span class="params">($water)</span> <span class="title">use</span> <span class="params">($stack,$pipe)</span></span></span><br><span class="line"><span class="function"> </span>{</span><br><span class="line"> <span class="keyword">return</span> $pipe::handle($water,$stack);</span><br><span class="line"> };</span><br><span class="line"> };</span><br><span class="line">}</span><br><span class="line"><span class="comment">// 通过增加和减少$pipes的数量,查看最终管道闭包的变化，更易于理解</span></span><br><span class="line">$pipes = [</span><br><span class="line"> <span class="string">'Sieve'</span>,</span><br><span class="line"> <span class="string">'KAlSO4'</span>,</span><br><span class="line"> <span class="comment">//'Heat'</span></span><br><span class="line">];</span><br><span class="line">$firstSlice = <span class="function"><span class="keyword">function</span><span class="params">($water)</span> </span>{</span><br><span class="line"> <span class="keyword">echo</span> <span class="string">"<span style='color:green;'>硬水净化完毕</span><br/>"</span>;</span><br><span class="line"> $softWater = $water;</span><br><span class="line"> <span class="keyword">return</span> $softWater;</span><br><span class="line">};</span><br><span class="line"></span><br><span class="line">$pipes = array_reverse($pipes); <span class="comment">// 由于闭包是逆向生成,必须先颠倒顺序。</span></span><br><span class="line"></span><br><span class="line">$pipeline = array_reduce($pipes, getSlice(),$firstSlice); <span class="comment">//最终管道闭包</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">echo</span> <span class="string">"<pre>"</span>.print_r($pipeline,<span class="number">1</span>);</span><br><span class="line"></span><br><span class="line">$hardWater = <span class="keyword">new</span> hardWater;</span><br><span class="line">$res = call_user_func($pipeline,$hardWater);</span><br></pre></td></tr></table></figure></p>
<p>这是最终的函数，以及打印结果<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><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br></pre></td><td class="code"><pre><span class="line">Closure Object</span><br><span class="line">( </span><br><span class="line"> <span class="comment">//第一次将Hardwater传入Sieve进行处理,比如结果为A1</span></span><br><span class="line"> [<span class="keyword">static</span>] => <span class="keyword">Array</span> </span><br><span class="line"> (</span><br><span class="line"> [stack] => Closure Object <span class="comment">// $next( A1 )</span></span><br><span class="line"> ( </span><br><span class="line"> <span class="comment">// 第二次将A1传入KAlSO4进行处理,比如结果为A2</span></span><br><span class="line"> [<span class="keyword">static</span>] => <span class="keyword">Array</span> </span><br><span class="line"> (</span><br><span class="line"> [stack] => Closure Object <span class="comment">// $next( A2 )</span></span><br><span class="line"> ( </span><br><span class="line"> <span class="comment">// 第三次次将A1传入Heat进行处理,比如结果为A3</span></span><br><span class="line"> [<span class="keyword">static</span>] => <span class="keyword">Array</span> </span><br><span class="line"> ( </span><br><span class="line"> <span class="comment">//最终$next(A3),执行firstSlice对应的闭包</span></span><br><span class="line"> <span class="comment">//也称之为destination(目的地)，最终结果</span></span><br><span class="line"> [stack] => Closure Object</span><br><span class="line"> (</span><br><span class="line"> [parameter] => <span class="keyword">Array</span></span><br><span class="line"> (</span><br><span class="line"> [$water] => </span><br><span class="line"> )</span><br><span class="line"></span><br><span class="line"> )</span><br><span class="line"></span><br><span class="line"> [pipe] => Heat</span><br><span class="line"> )</span><br><span class="line"></span><br><span class="line"> [parameter] => <span class="keyword">Array</span></span><br><span class="line"> (</span><br><span class="line"> [$water] => </span><br><span class="line"> )</span><br><span class="line"></span><br><span class="line"> )</span><br><span class="line"></span><br><span class="line"> [pipe] => KAlSO4</span><br><span class="line"> )</span><br><span class="line"></span><br><span class="line"> [parameter] => <span class="keyword">Array</span></span><br><span class="line"> (</span><br><span class="line"> [$water] => </span><br><span class="line"> )</span><br><span class="line"></span><br><span class="line"> )</span><br><span class="line"></span><br><span class="line"> [pipe] => Sieve</span><br><span class="line"> )</span><br><span class="line"></span><br><span class="line"> [parameter] => <span class="keyword">Array</span></span><br><span class="line"> (</span><br><span class="line"> [$water] => </span><br><span class="line"> )</span><br><span class="line"></span><br><span class="line">)</span><br><span class="line">沙子处理</span><br><span class="line">明矾处理</span><br><span class="line">加热处理</span><br><span class="line"><span class="string">'硬水净化完毕'</span></span><br><span class="line">离子过滤完毕</span><br><span class="line">杂质过滤完毕</span><br><span class="line">沙子过滤完毕</span><br></pre></td></tr></table></figure></p>
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