dubbo3-spi.drawio

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        <mxCell id="nFbYhWVqmTEnoM216xpz-1" value="&lt;h1 style=&quot;font-size: 16px;&quot;&gt;&lt;font style=&quot;font-size: 16px;&quot;&gt;Dubbo SPI 工作原理 &lt;/font&gt;&lt;font style=&quot;font-size: 16px; font-weight: normal;&quot;&gt;（3.2.9）&lt;/font&gt;&lt;/h1&gt;&lt;p style=&quot;font-size: 10px;&quot;&gt;SPI机制在框架中应用还是非常常见的，这里打算详细研究一下Dubbo SPI实现。官方文档：https://cn.dubbo.apache.org/zh-cn/overview/mannual/java-sdk/reference-manual/spi/&lt;br style=&quot;border-color: var(--border-color); font-size: 12px;&quot;&gt;对比一下JDK SPI 还 Dubbo SPI 的优缺点。&lt;br&gt;源码位于：dubbo-common/src/main/java/org/apache/dubbo/common/extension, （代码量3K行）官方还提供了丰富的单元测试。&lt;br&gt;&lt;span style=&quot;background-color: initial;&quot;&gt;可以从官方单元测试 ExtensionDirectorTest#testInheritanceAndScope()&amp;nbsp; 入手；&lt;br&gt;以 Dubbo SPI 加载 ProxyFactory 为例。&lt;/span&gt;&lt;br&gt;&lt;/p&gt;" style="text;html=1;strokeColor=none;fillColor=none;spacing=5;spacingTop=-20;whiteSpace=wrap;overflow=hidden;rounded=0;" parent="1" vertex="1">
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        <mxCell id="nFbYhWVqmTEnoM216xpz-3" value="&lt;div style=&quot;text-align: center;&quot;&gt;&lt;b&gt;ExtensionAccessor （I）&lt;/b&gt;&lt;br&gt;&lt;/div&gt;&lt;hr style=&quot;font-size: 10px;&quot;&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;ExtensionDirector getExtensionDirector();&lt;br&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&amp;lt;T&amp;gt; ExtensionLoader&amp;lt;T&amp;gt; getExtensionLoader(Class&amp;lt;T&amp;gt; type);&lt;br&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&amp;lt;T&amp;gt; T getExtension(Class&amp;lt;T&amp;gt; type, String name);&lt;br&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//获取自适应拓展类型&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&amp;lt;T&amp;gt; T getAdaptiveExtension(Class&amp;lt;T&amp;gt; type);&lt;br&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&amp;lt;T&amp;gt; T getDefaultExtension(Class&amp;lt;T&amp;gt; type)&lt;br&gt;&lt;/p&gt;" style="verticalAlign=top;align=left;overflow=fill;fontSize=10;fontFamily=Helvetica;html=1;whiteSpace=wrap;" parent="1" vertex="1">
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        <mxCell id="nFbYhWVqmTEnoM216xpz-4" value="&lt;div style=&quot;text-align: center;&quot;&gt;&lt;b&gt;ExtensionDirector&lt;/b&gt;&lt;br&gt;&lt;/div&gt;&lt;hr style=&quot;font-size: 10px;&quot;&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px; font-size: 10px;&quot;&gt;&lt;span style=&quot;background-color: initial;&quot;&gt;ExtensionLoader的管理器&lt;/span&gt;&lt;br&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;br&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//拓展类 -&amp;gt; ExtensionLoader, ExtensionLoader缓存&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private final ConcurrentMap&amp;lt;Class&amp;lt;?&amp;gt;, ExtensionLoader&amp;lt;?&amp;gt;&amp;gt; &lt;b&gt;extensionLoadersMap&lt;/b&gt; = new ConcurrentHashMap&amp;lt;&amp;gt;(64);&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//拓展类 -&amp;gt; ExtensionScope&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private final ConcurrentMap&amp;lt;Class&amp;lt;?&amp;gt;, ExtensionScope&amp;gt; &lt;b&gt;extensionScopeMap&lt;/b&gt; = new ConcurrentHashMap&amp;lt;&amp;gt;(64);&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//父管理器，&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private final ExtensionDirector &lt;b&gt;parent&lt;/b&gt;;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//拓展分享范围, FRAMEWORK APPLICATION MODULE SELF&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private final ExtensionScope &lt;b&gt;scope&lt;/b&gt;;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//拓展后置处理器，for ???&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private final List&amp;lt;ExtensionPostProcessor&amp;gt; &lt;b&gt;extensionPostProcessors&lt;/b&gt; = new ArrayList&amp;lt;&amp;gt;();&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//模型对象，做什么用的？&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private final ScopeModel &lt;b&gt;scopeModel&lt;/b&gt;;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private final AtomicBoolean destroyed = new AtomicBoolean();&lt;/p&gt;&lt;hr style=&quot;font-size: 10px;&quot;&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px; font-size: 10px;&quot;&gt;&lt;br&gt;&lt;/p&gt;" style="verticalAlign=top;align=left;overflow=fill;fontSize=10;fontFamily=Helvetica;html=1;whiteSpace=wrap;fillColor=#fff2cc;strokeColor=#d6b656;" parent="1" vertex="1">
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        <mxCell id="nFbYhWVqmTEnoM216xpz-6" value="&lt;div style=&quot;text-align: center;&quot;&gt;&lt;b&gt;ExtensionLoader&lt;/b&gt;&lt;br&gt;&lt;/div&gt;&lt;hr style=&quot;font-size: 10px;&quot;&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px; font-size: 10px;&quot;&gt;&lt;span style=&quot;background-color: initial;&quot;&gt;拓展类加载器，与拓展接口类一一对应&lt;/span&gt;&lt;br&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;span style=&quot;background-color: initial;&quot;&gt;&lt;br&gt;&lt;/span&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;span style=&quot;background-color: initial;&quot;&gt;private static final Pattern NAME_SEPARATOR = Pattern.compile(&quot;\\s*[,]+\\s*&quot;);&lt;/span&gt;&lt;br&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private static final String SPECIAL_SPI_PROPERTIES = &quot;special_spi.properties&quot;;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;br&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//已加载的类型（type的子类）和实例&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private final ConcurrentMap&amp;lt;Class&amp;lt;?&amp;gt;, Object&amp;gt; &lt;b&gt;extensionInstances&lt;/b&gt; = new ConcurrentHashMap&amp;lt;&amp;gt;(64);&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//加载的目标类型&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private final Class&amp;lt;?&amp;gt; &lt;b&gt;type&lt;/b&gt;;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//自适应的ExtensionInjector实例，用于给type类实例属性注入值&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private final ExtensionInjector &lt;b&gt;injector&lt;/b&gt;;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//拓展类-&amp;gt;拓展类名&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private final ConcurrentMap&amp;lt;Class&amp;lt;?&amp;gt;, String&amp;gt; &lt;b&gt;cachedNames&lt;/b&gt; = new ConcurrentHashMap&amp;lt;&amp;gt;();&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//加载的类型（除了@Adaptive 和 wrapper class, 这两种有专门的缓存位置 cachedAdaptiveClass cachedWrapperClasses&lt;/font&gt;&lt;font color=&quot;#007fff&quot;&gt;）&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private final Holder&amp;lt;Map&amp;lt;String, Class&amp;lt;?&amp;gt;&amp;gt;&amp;gt; &lt;b&gt;cachedClasses&lt;/b&gt; = new Holder&amp;lt;&amp;gt;();&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//拓展类名 -&amp;gt; Activate注解实例，首次加载接口类时缓存&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private final Map&amp;lt;String, Object&amp;gt; &lt;b&gt;cachedActivates&lt;/b&gt; = Collections.synchronizedMap(new LinkedHashMap&amp;lt;&amp;gt;());&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//拓展类名 -&amp;gt; Activate groups&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private final Map&amp;lt;String, Set&amp;lt;String&amp;gt;&amp;gt; &lt;b&gt;cachedActivateGroups&lt;/b&gt; = Collections.synchronizedMap(new LinkedHashMap&amp;lt;&amp;gt;());&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//拓展类名 -&amp;gt; Activate values&lt;/font&gt;&lt;br&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private final Map&amp;lt;String, String[][]&amp;gt; &lt;b&gt;cachedActivateValues&lt;/b&gt; = Collections.synchronizedMap(new LinkedHashMap&amp;lt;&amp;gt;());&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//加载的拓展类的实例Holder，不包括自适应拓展类的实例&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private final ConcurrentMap&amp;lt;String, Holder&amp;lt;Object&amp;gt;&amp;gt; &lt;b&gt;cachedInstances&lt;/b&gt; = new ConcurrentHashMap&amp;lt;&amp;gt;();&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//缓存已加载的自适应的拓展类的实例&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private final Holder&amp;lt;Object&amp;gt; &lt;b&gt;cachedAdaptiveInstance&lt;/b&gt; = new Holder&amp;lt;&amp;gt;();&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//缓存已加载的自适应拓展类, 这里可以看到每种接口类型的自适应拓展类只有一个&lt;/font&gt;&lt;br&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private volatile Class&amp;lt;?&amp;gt; &lt;b&gt;cachedAdaptiveClass&lt;/b&gt; = null;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//默认实现类名，@SPI中指定，对应SPI文件中的key&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private String &lt;b&gt;cachedDefaultName&lt;/b&gt;;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private volatile Throwable createAdaptiveInstanceError;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//加载的 wrapper class 类型,&amp;nbsp; 比如 APlus(A a)&amp;nbsp; APlus 就是 A 的 wrapper class&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private Set&amp;lt;Class&amp;lt;?&amp;gt;&amp;gt; &lt;b&gt;cachedWrapperClasses&lt;/b&gt;;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private final Map&amp;lt;String, IllegalStateException&amp;gt; exceptions = new ConcurrentHashMap&amp;lt;&amp;gt;();&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//加载策略列表，加载优先级从高到底依次是：DubboInternalLoadingStrategy DubboExternalLoadingStrategy&amp;nbsp;&lt;br&gt;DubboLoadingStrategy ServicesLoadingStrategy&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private static volatile LoadingStrategy[] &lt;b&gt;strategies&lt;/b&gt; = loadLoadingStrategies();&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;br&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private static final Map&amp;lt;String, String&amp;gt; &lt;b&gt;specialSPILoadingStrategyMap&lt;/b&gt; = getSpecialSPILoadingStrategyMap();&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private static SoftReference&amp;lt;Map&amp;lt;java.net.URL, List&amp;lt;String&amp;gt;&amp;gt;&amp;gt; &lt;b&gt;urlListMapCache&lt;/b&gt; =&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; new SoftReference&amp;lt;&amp;gt;(new ConcurrentHashMap&amp;lt;&amp;gt;());&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//实例属性注入时需要忽略的方法描述列表（包括ScopeModelAware ExtensionAccessorAware的全部方法），描述和JNI的语法类似，比如 setFrameworkProvider(Lorg/apache/dubbo/common/extension/director/FooFrameworkProvider;)V&lt;br&gt;&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private static final List&amp;lt;String&amp;gt; &lt;b&gt;ignoredInjectMethodsDesc&lt;/b&gt; = getIgnoredInjectMethodsDesc();&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//使用SPI时产生的无法接受的异常&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private final Set&amp;lt;String&amp;gt; &lt;b&gt;unacceptableExceptions&lt;/b&gt; = new ConcurrentHashSet&amp;lt;&amp;gt;();&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//所属的管理器&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private final ExtensionDirector &lt;b&gt;extensionDirector&lt;/b&gt;;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//指向所属的管理器的拓展后置处理器&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private final List&amp;lt;ExtensionPostProcessor&amp;gt; &lt;b&gt;extensionPostProcessors&lt;/b&gt;;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//实例化策略&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private InstantiationStrategy &lt;b&gt;instantiationStrategy&lt;/b&gt;;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private final ActivateComparator &lt;b&gt;activateComparator&lt;/b&gt;;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private final ScopeModel &lt;b&gt;scopeModel&lt;/b&gt;;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private final AtomicBoolean destroyed = new AtomicBoolean();&lt;/p&gt;&lt;hr style=&quot;font-size: 10px;&quot;&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px; font-size: 10px;&quot;&gt;&lt;br&gt;&lt;/p&gt;" style="verticalAlign=top;align=left;overflow=fill;fontSize=10;fontFamily=Helvetica;html=1;whiteSpace=wrap;fillColor=#fff2cc;strokeColor=#d6b656;" parent="1" vertex="1">
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        <mxCell id="nFbYhWVqmTEnoM216xpz-8" value="&lt;div style=&quot;text-align: center; font-size: 9px;&quot;&gt;&lt;b style=&quot;font-size: 9px;&quot;&gt;ExtensionScope (E)&lt;/b&gt;&lt;br style=&quot;font-size: 9px;&quot;&gt;&lt;/div&gt;&lt;hr style=&quot;font-size: 9px;&quot;&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px; font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot; style=&quot;font-size: 9px;&quot;&gt;//表示拓展实例（ExtensionLoader加载的实例）用在framework,所有applications 和 modules 共享&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px; font-size: 9px;&quot;&gt;FRAMEWORK,&lt;br style=&quot;font-size: 9px;&quot;&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px; font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot; style=&quot;font-size: 9px;&quot;&gt;//表示拓展实例用于某个应用，应用下所有modules共享&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px; font-size: 9px;&quot;&gt;APPLICATION,&lt;br style=&quot;font-size: 9px;&quot;&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px; font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot; style=&quot;font-size: 9px;&quot;&gt;//表示拓展实例用于某个模块&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px; font-size: 9px;&quot;&gt;MODULE,&lt;br style=&quot;font-size: 9px;&quot;&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px; font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot; style=&quot;font-size: 9px;&quot;&gt;//用于特殊SPI拓展(没有共享范围层级)，如ExtensionInjector&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px; font-size: 9px;&quot;&gt;SELF&lt;/p&gt;" style="verticalAlign=top;align=left;overflow=fill;fontSize=9;fontFamily=Helvetica;html=1;whiteSpace=wrap;" parent="1" vertex="1">
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        <mxCell id="BtQ9-s-YfgyTIdZ3fDr7-33" value="return &lt;b&gt;generateGetUrlNullCheck&lt;/b&gt;(index, pts[index], &quot;getUrl&quot;);&lt;br&gt;&lt;font color=&quot;#007fff&quot;&gt;即有getUrl方法&lt;/font&gt;" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;" parent="1" vertex="1">
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          <mxGeometry x="1481" y="2680" width="200" height="80" as="geometry" />
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        <mxCell id="BtQ9-s-YfgyTIdZ3fDr7-36" value="...&lt;br&gt;code.append(String.format(&quot;%s url = arg%d.%s();\n&quot;, URL.class.getName(), index, method));&lt;br&gt;..." style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;fillColor=#dae8fc;strokeColor=#6c8ebf;" parent="1" vertex="1">
          <mxGeometry x="1720" y="2600" width="200" height="60" as="geometry" />
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        <mxCell id="BtQ9-s-YfgyTIdZ3fDr7-39" value="return String.format(CODE_URL_NULL_CHECK, index, URL.class.getName(), index);" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;fillColor=#dae8fc;strokeColor=#6c8ebf;" parent="1" vertex="1">
          <mxGeometry x="1241" y="2280" width="200" height="60" as="geometry" />
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        <mxCell id="BtQ9-s-YfgyTIdZ3fDr7-41" value="&quot;if (arg%d == null) throw new IllegalArgumentException(\&quot;url == null\&quot;);\n&lt;br&gt;%s &lt;b&gt;url = arg%d&lt;/b&gt;;\n&quot;;" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" parent="1" vertex="1">
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        <mxCell id="34Wvdx35s0JXqbyZLGz6-6" value="" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;" edge="1" parent="1" source="34Wvdx35s0JXqbyZLGz6-1" target="34Wvdx35s0JXqbyZLGz6-5">
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        <mxCell id="34Wvdx35s0JXqbyZLGz6-1" value="&amp;nbsp;String[] value = getMethodAdaptiveValue(&lt;br&gt;adaptiveAnnotation);&lt;br&gt;&lt;font color=&quot;#007fff&quot;&gt;获取@Adaptive value数组，数组为空就获取接口类名（CAMEL转全小写，英文句号分割）&lt;br&gt;&lt;/font&gt;" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;" vertex="1" parent="1">
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        </mxCell>
        <mxCell id="34Wvdx35s0JXqbyZLGz6-4" value="&lt;font color=&quot;#007fff&quot;&gt;以org.apache.dubbo.rpc.Protocol export()为例&lt;br&gt;这一步获取的是 [&quot;protocol&quot;]&lt;/font&gt;" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" vertex="1" parent="1">
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        <mxCell id="34Wvdx35s0JXqbyZLGz6-8" value="" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;" edge="1" parent="1" source="34Wvdx35s0JXqbyZLGz6-5" target="34Wvdx35s0JXqbyZLGz6-7">
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        <mxCell id="34Wvdx35s0JXqbyZLGz6-5" value="boolean hasInvocation = hasInvocationArgument(method);&lt;br&gt;&lt;font color=&quot;#007fff&quot;&gt;是否有Invocation类型参数&lt;br&gt;&lt;/font&gt;" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;" vertex="1" parent="1">
          <mxGeometry x="760" y="2520" width="200" height="60" as="geometry" />
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        <mxCell id="34Wvdx35s0JXqbyZLGz6-10" value="" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;" edge="1" parent="1" source="34Wvdx35s0JXqbyZLGz6-7" target="34Wvdx35s0JXqbyZLGz6-9">
          <mxGeometry relative="1" as="geometry" />
        </mxCell>
        <mxCell id="34Wvdx35s0JXqbyZLGz6-7" value="code.append(&lt;br&gt;generateInvocationArgumentNullCheck(&lt;br&gt;method));" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;" vertex="1" parent="1">
          <mxGeometry x="760" y="2600" width="200" height="60" as="geometry" />
        </mxCell>
        <mxCell id="34Wvdx35s0JXqbyZLGz6-13" value="" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;" edge="1" parent="1" source="34Wvdx35s0JXqbyZLGz6-9" target="34Wvdx35s0JXqbyZLGz6-12">
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        <mxCell id="34Wvdx35s0JXqbyZLGz6-16" value="" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;" edge="1" parent="1" source="34Wvdx35s0JXqbyZLGz6-9" target="34Wvdx35s0JXqbyZLGz6-15">
          <mxGeometry relative="1" as="geometry" />
        </mxCell>
        <mxCell id="34Wvdx35s0JXqbyZLGz6-9" value="code.append(&lt;br&gt;&lt;b&gt;generateExtNameAssignment&lt;/b&gt;(&lt;br&gt;value, hasInvocation));" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;fillColor=#fff2cc;strokeColor=#d6b656;" vertex="1" parent="1">
          <mxGeometry x="760" y="2680" width="200" height="60" as="geometry" />
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        <mxCell id="34Wvdx35s0JXqbyZLGz6-11" value="&lt;font color=&quot;#007fff&quot;&gt;以org.apache.dubbo.rpc.Protocol export()为例&lt;br&gt;这一步生成的是&lt;br&gt;String extName = ( url.getProtocol() == null ? &lt;br&gt;&quot;dubbo&quot; : url.getProtocol() );&lt;br&gt;&lt;/font&gt;" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" vertex="1" parent="1">
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        <mxCell id="34Wvdx35s0JXqbyZLGz6-12" value="直接去看代码吧，不太方便描述&lt;br&gt;代码倒是比较简单" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;" vertex="1" parent="1">
          <mxGeometry x="1000" y="2680" width="200" height="60" as="geometry" />
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        <mxCell id="34Wvdx35s0JXqbyZLGz6-14" value="&lt;font color=&quot;#007fff&quot;&gt;以org.apache.dubbo.rpc.Protocol export()为例&lt;br&gt;这一步生成的是&lt;br&gt;&lt;div&gt;org.apache.dubbo.common.URL url = arg0.getUrl();&lt;/div&gt;&lt;/font&gt;" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" vertex="1" parent="1">
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        <mxCell id="34Wvdx35s0JXqbyZLGz6-15" value="其他不太重要" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;" vertex="1" parent="1">
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