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Java - 非著名Java程序员
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<h1>Dubbo SPI</h1>
<div class="a-content">
<div class="a-content-text">
<div class="mweb_toc"><ul>
<li><a href="#java-spi">Java SPI</a></li>
<li><a href="#dubbo-spi">Dubbo SPI</a></li>
<li><a href="#dubbo-spi%E7%9A%84%E5%AE%9E%E7%8E%B0">Dubbo SPI 的实现</a>
<ul>
<li><a href="#extensionloader-getextensionloader">ExtensionLoader.getExtensionLoader</a></li>
<li><a href="#getadaptiveextension">getAdaptiveExtension()</a></li>
<li><a href="#extensionloader-getextension">extensionLoader.getExtension</a></li>
<li><a href="#createextension">createExtension</a></li>
</ul>
</li>
<li><a href="#wrapper%E7%B1%BB">wrapper 类</a></li>
</ul>
</div>
<p>Dubbo 源码阅读 gitee：<a href="https://gitee.com/hitol/dubbo-source/tree/read_2.7.5/">https://gitee.com/hitol/dubbo-source/tree/read_2.7.5/</a></p>
<h2><a id="java-spi" class="anchor" aria-hidden="true"><span class="octicon octicon-link"></span></a>Java SPI</h2>
<p>SPI 是服务发现机制，为某个接口寻找服务的实现。<br />
是 JDK 6 的特性，ServiceLoader。<br />
ServiceLoader启动时会到 resource/META-INF/services/ 目录下读取以 实现类的全限定名 命名的文件。</p>
<p>程序通过 ServiceLoader 动态加载实现类模块，通过扫描 META-INF/services 目录下的配置文件找到实现类的全限定名，把类加载到JVM;</p>
<p>demo：</p>
<pre class="line-numbers"><code class="language-plain_text">// 一个接口，两个实现类
public interface Fruit {
void printName();
}
public class Apple implements Fruit {
@Override
public void printName() {
System.out.println("Apple");
}
}
public class Orange implements Fruit {
@Override
public void printName() {
System.out.println("Orange");
}
}
</code></pre>
<p>在 src/main/resources/META-INF/services 下新建文件 xxx.xxx.xx.Fruit，这个文件名就是Fruit接口的全限定名，<br />
文件内容：</p>
<pre class="line-numbers"><code class="language-plain_text">com.hitol.service.impl.Apple
com.hitol.service.impl.Orange
</code></pre>
<p>文件中的内容是 Apple、Orange类的全限定名，可以配置一个也可以配置多个。</p>
<pre class="line-numbers"><code class="language-plain_text">public static void main(String[] args) {
ServiceLoader<Fruit> fruits = ServiceLoader.load(Fruit.class);
for (Fruit fruit : fruits) {
fruit.printName();
}
}
</code></pre>
<p>会依次调用xxx.xxx.xx.Fruit文件中配置的具体实现类。</p>
<hr />
<p>应用场景：各种数据库连接<br />
<img src="http://hitol.blog.cdn.updev.cn/16146868237742.jpg" alt="" /></p>
<h2><a id="dubbo-spi" class="anchor" aria-hidden="true"><span class="octicon octicon-link"></span></a>Dubbo SPI</h2>
<p>Dubbo SPI 扩展点加载，从 JDK 标准的 SPI 扩展点机制加强而来。<br />
加载的路径约定为： resource/META-INF/dubbo/接口全限定名<br />
增加了对扩展点 IOC 和 AOP 的支持，一个扩展点可以直接 setter 注入其它扩展点。</p>
<p>将上面例子中的xx.Fruit文件移到 resource/META-INF/dubbo/ 目录下，同时需要在 Fruit 类上加 Dubbo 注解 @SPI。<br />
文件内容</p>
<pre class="line-numbers"><code class="language-plain_text">orange=com.hitol.util.services.impl.Orange
apple=com.hitol.util.services.impl.Apple
</code></pre>
<p>demo：</p>
<pre class="line-numbers"><code class="language-plain_text">public static void main(String[] args) {
ExtensionLoader<Fruit> extensionLoader = ExtensionLoader.getExtensionLoader(Fruit.class);
Fruit apple = extensionLoader.getExtension("apple");
Fruit orange = extensionLoader.getExtension("orange");
apple.printName();
orange.printName();
}
</code></pre>
<p>Dubbo SPI 的实现封装在 ExtensionLoader 中。</p>
<p>Dubbo 中几乎到处可见 SPI 机制的应用，比如说，</p>
<ol>
<li>反射创建默认实现类，org.apache.dubbo.common.extension.ExtensionLoader#createAdaptiveExtensionClass</li>
<li>dubbo 协议</li>
</ol>
<h2><a id="dubbo-spi%E7%9A%84%E5%AE%9E%E7%8E%B0" class="anchor" aria-hidden="true"><span class="octicon octicon-link"></span></a>Dubbo SPI 的实现</h2>
<p>ExtensionLoader.getExtensionLoader<br />
ExtensionLoader.getExtensionLoader(ExtensionFactory.class).getAdaptiveExtension())<br />
extensionLoader.getExtension</p>
<h3><a id="extensionloader-getextensionloader" class="anchor" aria-hidden="true"><span class="octicon octicon-link"></span></a>ExtensionLoader.getExtensionLoader</h3>
<p><img src="http://hitol.blog.cdn.updev.cn/SPI-1-getExtensionLoader.png" alt="SPI-1-getExtensionLoade" /></p>
<p>这个方法的逻辑比较简单，是否有 SPI 注解，缓存中没有的话就 new 一个 ExtensionLoader 出来，不过在 new 的时候会去获取 objectFactory 属性的值。第一次 new 的话，会加载 ExtensionFactory，并获取它的默认实现。</p>
<pre class="line-numbers"><code class="language-java">private ExtensionLoader(Class<?> type) {
this.type = type;
objectFactory = (type == ExtensionFactory.class ? null : ExtensionLoader.getExtensionLoader(ExtensionFactory.class).getAdaptiveExtension());
}
</code></pre>
<h3><a id="getadaptiveextension" class="anchor" aria-hidden="true"><span class="octicon octicon-link"></span></a>getAdaptiveExtension()</h3>
<p>SPI 修饰的接口的实现类中，获取带有 @Adaptive 注解的实现。<br />
在同一个接口的实现类中，@Adaptive 注解只能修饰其中的一个实现类，表示该接口的默认实现。</p>
<p>getAdaptiveExtension 方法就是获取这个默认的实现类。</p>
<p>SPI(value= "apple") 注解上可以指定 默认的实现类。</p>
<h3><a id="extensionloader-getextension" class="anchor" aria-hidden="true"><span class="octicon octicon-link"></span></a>extensionLoader.getExtension</h3>
<pre class="line-numbers"><code class="language-java">public T getExtension(String name) {
if (StringUtils.isEmpty(name)) {
throw new IllegalArgumentException("Extension name == null");
}
if ("true".equals(name)) {
return getDefaultExtension();
}
// 获取holder，相当于持有对象的锁
// 从缓存map cachedInstances 中获取，获取不到就new
final Holder<Object> holder = getOrCreateHolder(name);
Object instance = holder.get();
// 双重检测单例模式
// 此处这个锁对象是holder，而不是整个class对象，锁粒度更小，并发更高
if (instance == null) {
synchronized (holder) {
instance = holder.get();
if (instance == null) {
instance = createExtension(name);
holder.set(instance);
}
}
}
return (T) instance;
}
</code></pre>
<p><img src="http://hitol.blog.cdn.updev.cn/getExtension.png" alt="getExtension" /></p>
<p>拓展类对象的获取过程，都是先从缓存中查找，没有在新建对象。最重要的实现逻辑是在 createExtension 方法中。</p>
<h3><a id="createextension" class="anchor" aria-hidden="true"><span class="octicon octicon-link"></span></a>createExtension</h3>
<pre class="line-numbers"><code class="language-java">private T createExtension(String name) {
// 先从cachedClasses 缓存map中获取类对象，获取不到则new
Class<?> clazz = getExtensionClasses().get(name);
if (clazz == null) {
throw findException(name);
}
try {
T instance = (T) EXTENSION_INSTANCES.get(clazz);
if (instance == null) {
// 生成具体类实例对象，放入缓存
EXTENSION_INSTANCES.putIfAbsent(clazz, clazz.newInstance());
instance = (T) EXTENSION_INSTANCES.get(clazz);
}
// IOC 注入
injectExtension(instance);
Set<Class<?>> wrapperClasses = cachedWrapperClasses;
if (CollectionUtils.isNotEmpty(wrapperClasses)) {
for (Class<?> wrapperClass : wrapperClasses) {
instance = injectExtension((T) wrapperClass.getConstructor(type).newInstance(instance));
}
}
initExtension(instance);
return instance;
} catch (Throwable t) {
throw new IllegalStateException("Extension instance (name: " + name + ", class: " +
type + ") couldn't be instantiated: " + t.getMessage(), t);
}
}
=========================================
private Map<String, Class<?>> getExtensionClasses() {
// 缓存
Map<String, Class<?>> classes = cachedClasses.get();
// 双重检查单例模式
if (classes == null) {
synchronized (cachedClasses) {
classes = cachedClasses.get();
if (classes == null) {
// 加载所有的扩展点对象，然后放到缓存中
// SpiExtensionFactory
classes = loadExtensionClasses();
cachedClasses.set(classes);
}
}
}
return classes;
}
=========================================
private Map<String, Class<?>> loadExtensionClasses() {
cacheDefaultExtensionName();
Map<String, Class<?>> extensionClasses = new HashMap<>();
// internal extension load from ExtensionLoader's ClassLoader first . 先加载 /internal 目录下的扩展点
loadDirectory(extensionClasses, DUBBO_INTERNAL_DIRECTORY, type.getName(), true);
// replace("org.apache", "com.alibaba") 替换包名这个骚操作
loadDirectory(extensionClasses, DUBBO_INTERNAL_DIRECTORY, type.getName().replace("org.apache", "com.alibaba"), true);
loadDirectory(extensionClasses, DUBBO_DIRECTORY, type.getName());
loadDirectory(extensionClasses, DUBBO_DIRECTORY, type.getName().replace("org.apache", "com.alibaba"));
loadDirectory(extensionClasses, SERVICES_DIRECTORY, type.getName());
loadDirectory(extensionClasses, SERVICES_DIRECTORY, type.getName().replace("org.apache", "com.alibaba"));
return extensionClasses;
}
</code></pre>
<h2><a id="wrapper%E7%B1%BB" class="anchor" aria-hidden="true"><span class="octicon octicon-link"></span></a>wrapper 类</h2>
<p>wrapper 相当于 AOP 动态代理生成的 代理对象。</p>
<p>一个类它是 wrapper 类的条件:</p>
<ol>
<li>实现某个接口</li>
<li>类中只有一个属性变量，是该接口的实例</li>
<li>只有包含这个属性变量的构造方法。</li>
</ol>
<pre class="line-numbers"><code class="language-java">/**
* test if clazz is a wrapper class
* <p>
* which has Constructor with given class type as its only argument
*/
private boolean isWrapperClass(Class<?> clazz) {
try {
clazz.getConstructor(type);
return true;
} catch (NoSuchMethodException e) {
return false;
}
}
</code></pre>
<pre class="line-numbers"><code class="language-java">Fruit 的 wrapper 类
public class FruitWrapper implements Fruit {
private Fruit fruit;
public FruitWrapper(Fruit fruit) {
this.fruit = fruit;
}
@Override
public void printName() {
System.out.println("this is wrapper");
fruit.printName();
}
}
---
文件内容
orange=com.hitol.util.services.impl.Orange
apple=com.hitol.util.services.impl.Apple
com.hitol.util.services.impl.FruitWrapper
---
ExtensionLoader<Fruit> extensionLoader = ExtensionLoader.getExtensionLoader(Fruit.class);
Fruit apple = extensionLoader.getExtension("apple");
apple.printName();
---
输出内容：
this is wrapper
Apple
</code></pre>
<p>输出内容：</p>
<pre class="line-numbers"><code class="language-plain_text">this is wrapper
Apple
</code></pre>
<hr />
<p><a href="https://dubbo.apache.org/zh/docs/v2.7/dev/spi/">https://dubbo.apache.org/zh/docs/v2.7/dev/spi/</a><br />
<a href="https://dubbo.apache.org/zh/docs/v2.7/dev/source/dubbo-spi/">https://dubbo.apache.org/zh/docs/v2.7/dev/source/dubbo-spi/</a></p>
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<span class="date">2021/02/01 16:01 下午</span>
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