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<p>SPI全称是Service Provider Interface，咋眼看跟api是不是有点相似，api是application interface，这两个其实在某些方面有类似的地方，也有蛮大的区别，比如我们基于 dubbo 的微服务，一般我们可以提供服务，然后非泛化调用的话，我们可以把 api 包提供给应用调用方，他们根据接口签名传对应参数并配置好对应的服务发现如 zk 等就可以调用我们的服务了，然后 spi 会有点类似但是是反过来的关系，相当于是一种规范，比如我约定完成这个功能需要两个有两个接口，一个是连接的，一个是断开的，其实就可以用 jdbc 的驱动举例，比较老套了，然后各个厂家去做具体的实现吧，到时候根据我接口的全限定名的文件来加载实际的实现类，然后运行的时候调用对应实现类的方法就完了</p>
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<p><img data-src="https://mystore-1255223546.cos.ap-chengdu.myqcloud.com/uPic/3sKdpg.png" alt="3sKdpg"></p>
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<p>看上面的图，<code>java.sql.Driver</code>就是 spi，对应在classpath 的 META-INF/services 目录下的这个文件，里边的内容就是具体的实现类</p>
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<p><img data-src="https://mystore-1255223546.cos.ap-chengdu.myqcloud.com/uPic/1590735097909.jpg" alt="1590735097909"></p>
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<p>简单介绍了 Java的 SPI，再来说说 dubbo 的，dubbo 中为啥要用 SPI 呢，主要是为了框架的可扩展性和性能方面的考虑，比如协议层 dubbo 默认使用 dubbo 协议，同时也支持很多其他协议，也支持用户自己实现协议，那么跟 Java 的 SPI 会有什么区别呢，我们也来看个文件</p>
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<p><img data-src="https://mystore-1255223546.cos.ap-chengdu.myqcloud.com/uPic/bqxWMp.png" alt="bqxWMp"></p>
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<p>是不是看着很想，又有点不一样，在 Java 的 SPI 配置文件里每一行只有一个实现类的全限定名，在 Dubbo的 SPI配置文件中是 key=value 的形式，我们只需要对应的 key 就能加载对应的实现，</p>
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<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><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></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 返回指定名字的扩展。如果指定名字的扩展不存在，则抛异常 {<span class="doctag">@link</span> IllegalStateException}.</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@param</span> name</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@return</span></span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="meta">@SuppressWarnings</span>(<span class="string">"unchecked"</span>)</span><br><span class="line"> <span class="function"><span class="keyword">public</span> T <span class="title">getExtension</span><span class="params">(String name)</span> </span>{</span><br><span class="line"> <span class="keyword">if</span> (name == <span class="keyword">null</span> || name.length() == <span class="number">0</span>)</span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> IllegalArgumentException(<span class="string">"Extension name == null"</span>);</span><br><span class="line"> <span class="keyword">if</span> (<span class="string">"true"</span>.equals(name)) {</span><br><span class="line"> <span class="keyword">return</span> getDefaultExtension();</span><br><span class="line"> }</span><br><span class="line"> Holder<Object> holder = cachedInstances.get(name);</span><br><span class="line"> <span class="keyword">if</span> (holder == <span class="keyword">null</span>) {</span><br><span class="line"> cachedInstances.putIfAbsent(name, <span class="keyword">new</span> Holder<Object>());</span><br><span class="line"> holder = cachedInstances.get(name);</span><br><span class="line"> }</span><br><span class="line"> Object instance = holder.get();</span><br><span class="line"> <span class="keyword">if</span> (instance == <span class="keyword">null</span>) {</span><br><span class="line"> <span class="keyword">synchronized</span> (holder) {</span><br><span class="line"> instance = holder.get();</span><br><span class="line"> <span class="keyword">if</span> (instance == <span class="keyword">null</span>) {</span><br><span class="line"> instance = createExtension(name);</span><br><span class="line"> holder.set(instance);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> (T) instance;</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
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<p>这里其实就可以看出来第二个不同点了，就是这个<code>cachedInstances</code>，第一个是不用像 Java 原生的 SPI 那样去遍历加载对应的服务类，只需要通过 key 去寻找，并且寻找的时候会先从缓存的对象里去取，还有就是注意下这里的 DCL(double check lock)</p>
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<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><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></pre></td><td class="code"><pre><span class="line"><span class="meta">@SuppressWarnings</span>(<span class="string">"unchecked"</span>)</span><br><span class="line"> <span class="function"><span class="keyword">private</span> T <span class="title">createExtension</span><span class="params">(String name)</span> </span>{</span><br><span class="line"> Class<?> clazz = getExtensionClasses().get(name);</span><br><span class="line"> <span class="keyword">if</span> (clazz == <span class="keyword">null</span>) {</span><br><span class="line"> <span class="keyword">throw</span> findException(name);</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> T instance = (T) EXTENSION_INSTANCES.get(clazz);</span><br><span class="line"> <span class="keyword">if</span> (instance == <span class="keyword">null</span>) {</span><br><span class="line"> EXTENSION_INSTANCES.putIfAbsent(clazz, (T) clazz.newInstance());</span><br><span class="line"> instance = (T) EXTENSION_INSTANCES.get(clazz);</span><br><span class="line"> }</span><br><span class="line"> injectExtension(instance);</span><br><span class="line"> Set<Class<?>> wrapperClasses = cachedWrapperClasses;</span><br><span class="line"> <span class="keyword">if</span> (wrapperClasses != <span class="keyword">null</span> && wrapperClasses.size() > <span class="number">0</span>) {</span><br><span class="line"> <span class="keyword">for</span> (Class<?> wrapperClass : wrapperClasses) {</span><br><span class="line"> instance = injectExtension((T) wrapperClass.getConstructor(type).newInstance(instance));</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> instance;</span><br><span class="line"> } <span class="keyword">catch</span> (Throwable t) {</span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> IllegalStateException(<span class="string">"Extension instance(name: "</span> + name + <span class="string">", class: "</span> +</span><br><span class="line"> type + <span class="string">") could not be instantiated: "</span> + t.getMessage(), t);</span><br><span class="line"> }</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
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<p>然后就是创建扩展了，这里如果 wrapperClasses 就会遍历生成wrapper实例，并做 setter 依赖注入，但是这里cachedWrapperClasses的来源还是有点搞不清楚，得再看下 com.alibaba.dubbo.common.extension.ExtensionLoader#loadFile的具体逻辑<br>又看了遍新的代码，这个函数被抽出来了</p>
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<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></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * test if clazz is a wrapper class</span></span><br><span class="line"><span class="comment"> * <p></span></span><br><span class="line"><span class="comment"> * which has Constructor with given class type as its only argument</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="function"><span class="keyword">private</span> <span class="keyword">boolean</span> <span class="title">isWrapperClass</span><span class="params">(Class<?> clazz)</span> </span>{</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> clazz.getConstructor(type);</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line"> } <span class="keyword">catch</span> (NoSuchMethodException e) {</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line"> }</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
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<p>是否是 wrapperClass 其实就看构造函数的。</p>
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