标签：优先级 highlight getname erro net interface 大量 根据 bsp
https://www.jianshu.com/p/dc616814ce98
一、四个测试用例
准备如下
import com.alibaba.dubbo.common.URL;
import com.alibaba.dubbo.common.extension.Adaptive;
import com.alibaba.dubbo.common.extension.SPI;
@SPI
public interface AdaptiveExt2 {
@Adaptive
String echo(String msg, URL url);
}
三个实现类
public class DubboAdaptiveExt2 implements AdaptiveExt2 {
@Override
public String echo(String msg, URL url) {
return "dubbo";
}
}
public class SpringCloudAdaptiveExt2 implements AdaptiveExt2 {
@Override
public String echo(String msg, URL url) {
return "spirng cloud";
}
}
public class ThriftAdaptiveExt2 implements AdaptiveExt2 {
@Override
public String echo(String msg, URL url) {
return "thrift";
}
}
在Resource目录下，添加/META-INF/dubbo/internal/com.example.dubbo.adaptive.AdaptiveExt2
dubbo=com.example.dubbo.adaptive.DubboAdaptiveExt2
cloud=com.example.dubbo.adaptive.SpringCloudAdaptiveExt2
thrift=com.example.dubbo.adaptive.ThriftAdaptiveExt2
测试1. SPI注解上有value值
@SPI("dubbo") public interface AdaptiveExt2 { @Adaptive String echo(String msg, URL url); } @Test public void testdubbo(){ // @SPI("dubbo") ExtensionLoader<AdaptiveExt2> loader = ExtensionLoader.getExtensionLoader(AdaptiveExt2.class); AdaptiveExt2 adaptiveExtension = loader.getAdaptiveExtension(); URL url = URL.valueOf("test://loalhost/test"); System.out.println(adaptiveExtension.echo("d",url)); }
结果
dubbo
测试2 SPI注解上有value值，URL上也有具体的值
@SPI("dubbo")
public interface AdaptiveExt2 {
@Adaptive
String echo(String msg, URL url);
}
@Test
public void testdubbo2(){
// @SPI("dubbo")
// +?adaptive.ext2=cloud
ExtensionLoader<AdaptiveExt2> loader = ExtensionLoader.getExtensionLoader(AdaptiveExt2.class);
AdaptiveExt2 adaptiveExtension = loader.getAdaptiveExtension();
URL url = URL.valueOf("test://loalhost/test?adaptive.ext2=cloud");
System.out.println(adaptiveExtension.echo("d",url));
}
结果
spirng cloud
说明 RUL优先于SPI注解的value值
测试3 SPI注解有value值，URL中也有具体的值，实现类上有@Adaptive注解
@SPI("dubbo")
public interface AdaptiveExt2 {
@Adaptive
String echo(String msg, URL url);
}
@Adaptive
public class ThriftAdaptiveExt2 implements AdaptiveExt2 {
@Override
public String echo(String msg, URL url) {
return "thrift";
}
}
@Test
public void testdubbo3(){
// @Adaptive
//public class ThriftAdaptiveExt2
//+?adaptive.ext2=cloud
ExtensionLoader<AdaptiveExt2> loader = ExtensionLoader.getExtensionLoader(AdaptiveExt2.class);
AdaptiveExt2 adaptiveExtension = loader.getAdaptiveExtension();
URL url = URL.valueOf("test://loalhost/test?adaptive.ext2=cloud");
System.out.println(adaptiveExtension.echo("d",url));
}
结果
thrift
说明 实现类的@Adaptive注解优先于URL
测试4 SPI注解中有value值，实现类上没有@Adaptive注解，在方法上打上@Adaptive注解，注解中的value与链接中的参数key一致，
@SPI("dubbo")
public interface AdaptiveExt2 {
@Adaptive({"t"})
String echo(String msg, URL url);
}
@Test
public void testdubbo4(){
// @SPI("dubbo")
//public interface AdaptiveExt2 {
// @Adaptive({"t"})
// String echo(String msg, URL url);
// ?t=cloud
ExtensionLoader<AdaptiveExt2> loader = ExtensionLoader.getExtensionLoader(AdaptiveExt2.class);
AdaptiveExt2 adaptiveExtension = loader.getAdaptiveExtension();
URL url = URL.valueOf("test://loalhost/test?t=cloud");
System.out.println(adaptiveExtension.echo("d",url));
}
结果
spirng cloud
测试结论：
1.在类上加@Adaptive注解的类，是最明确的创建对应类型的Adaptive类。所有它的优先级最高
2.@SPI注解的value值是默认值，如果通过URL获取不到关于取那个类作为Adaptive类的话，就是用这个默认值，当然如果URL中可以获取到，就用URL中的
3.可以在方法上增加@Adaptive注解，注解中value与链接中的参数key一致，连接中的key对应的value就是spi中的name，获取对应的实现类
ExtensionLoader<AdaptiveExt2> loader = ExtensionLoader.getExtensionLoader(AdaptiveExt2.class);
@SuppressWarnings("unchecked")
public static <T> ExtensionLoader<T> getExtensionLoader(Class<T> type) {
if (type == null)
throw new IllegalArgumentException("Extension type == null");
if(!type.isInterface()) {
throw new IllegalArgumentException("Extension type(" + type + ") is not interface!");
}
// 这个类型必须加上SPI注解，否则报错
if(!withExtensionAnnotation(type)) {
throw new IllegalArgumentException("Extension type(" + type +
") is not extension, because WITHOUT @" + SPI.class.getSimpleName() + " Annotation!");
}
// 从缓存中获取
ExtensionLoader<T> loader = (ExtensionLoader<T>) EXTENSION_LOADERS.get(type);
if (loader == null) {
EXTENSION_LOADERS.putIfAbsent(type, new ExtensionLoader<T>(type));
loader = (ExtensionLoader<T>) EXTENSION_LOADERS.get(type);
}
return loader;
}
先检查SPI注解，再缓存中查询对应ExtensionLoader,dubbo中的spi大量利用了本地缓存。
// 构造方法私有化
private ExtensionLoader(Class<?> type) {
this.type = type;
// 如果type是ExtensionFactory类型，那么objectFactory是null，否则是ExtensionFactory类型的适配器
objectFactory = (type == ExtensionFactory.class ? null : ExtensionLoader.getExtensionLoader(ExtensionFactory.class).getAdaptiveExtension());
}
两点：
1.构造方法私有化，不能通过外部实例化
2.objectFactory是ioc功能
开始获取adaptive对象
@SuppressWarnings("unchecked")
public T getAdaptiveExtension() {
Object instance = cachedAdaptiveInstance.get();
if (instance == null) {
if(createAdaptiveInstanceError == null) {
synchronized (cachedAdaptiveInstance) {
instance = cachedAdaptiveInstance.get();
if (instance == null) {
try {
// 缓存获取不到就创建
instance = createAdaptiveExtension();
cachedAdaptiveInstance.set(instance);
} catch (Throwable t) {
createAdaptiveInstanceError = t;
throw new IllegalStateException("fail to create adaptive instance: " + t.toString(), t);
}
}
}
}
else {
throw new IllegalStateException("fail to create adaptive instance: " + createAdaptiveInstanceError.toString(), createAdaptiveInstanceError);
}
}
return (T) instance;
}
第一次从缓存中获取就创建
@SuppressWarnings("unchecked")
private T createAdaptiveExtension() {
try {
return injectExtension((T) getAdaptiveExtensionClass().newInstance());
} catch (Exception e) {
throw new IllegalStateException("Can not create adaptive extenstion " + type + ", cause: " + e.getMessage(), e);
}
}
获取到适配器类的Class，利用反射船舰适配器类的实例，injectExtension是dubbo的DI，依赖注入，如果适配器类有属性的set方法，就会自动注入。
private Class<?> getAdaptiveExtensionClass() {
// 触发SPI流程的扫描
getExtensionClasses();
// 如果通过上面的步骤可以获取到cacheAdaptiveClass直接返回，如果不行就自行利用动态代理创建一个
if (cachedAdaptiveClass != null) {
return cachedAdaptiveClass;
}
// 利用动态代理创建一个扩展类
return cachedAdaptiveClass = createAdaptiveExtensionClass();
}
首先先看getExtensionClasses
private Map<String, Class<?>> getExtensionClasses() {
Map<String, Class<?>> classes = cachedClasses.get();
if (classes == null) {
synchronized (cachedClasses) {
classes = cachedClasses.get();
if (classes == null) {
classes = loadExtensionClasses();
cachedClasses.set(classes);
}
}
}
return classes;
}
从缓存中取，也就是说加载流程只触发一次，然后放入缓存，后续从缓存中取
// 此方法已经getExtensionClasses方法同步过。 private Map<String, Class<?>> loadExtensionClasses() {
// 获取到类型SPI注解，所以利用SPI扩展点的地方，需要加入SPI注解 final SPI defaultAnnotation = type.getAnnotation(SPI.class); if(defaultAnnotation != null) { String value = defaultAnnotation.value(); if(value != null && (value = value.trim()).length() > 0) { String[] names = NAME_SEPARATOR.split(value); if(names.length > 1) { throw new IllegalStateException("more than 1 default extension name on extension " + type.getName() + ": " + Arrays.toString(names)); }
// 如果注解中有value，说明有默认的实现，那么将value放到cacheDefaultName中 if(names.length == 1) cachedDefaultName = names[0]; } } // 从 META-INF/dubbo/internal/...读取数据 Map<String, Class<?>> extensionClasses = new HashMap<String, Class<?>>(); loadFile(extensionClasses, DUBBO_INTERNAL_DIRECTORY); loadFile(extensionClasses, DUBBO_DIRECTORY); loadFile(extensionClasses, SERVICES_DIRECTORY); return extensionClasses; }
获取type上SPI注解，如果里面有value值就赋值给cacheDefaultName变量，随后从META-INF/dubbo/internal/ 、META-INF/dubbo/、META-INF/services/ 这三个路径下搜索对应的文件。
private void loadFile(Map<String, Class<?>> extensionClasses, String dir) { String fileName = dir + type.getName(); try { Enumeration<java.net.URL> urls; ClassLoader classLoader = findClassLoader(); if (classLoader != null) { urls = classLoader.getResources(fileName); } else { urls = ClassLoader.getSystemResources(fileName); } if (urls != null) { while (urls.hasMoreElements()) { java.net.URL url = urls.nextElement(); try { BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream(), "utf-8")); try { String line = null; while ((line = reader.readLine()) != null) {
// 排除一些# 注释的内容 final int ci = line.indexOf(‘#‘); if (ci >= 0) line = line.substring(0, ci); line = line.trim(); if (line.length() > 0) { try { String name = null;
// 使用 = 进行分割 name=全路径名称 int i = line.indexOf(‘=‘); if (i > 0) { name = line.substring(0, i).trim(); line = line.substring(i + 1).trim(); } if (line.length() > 0) {
// 加载解析出的类的全限定名称 Class<?> clazz = Class.forName(line, true, classLoader);
// 判断新家在的clazz是否是type的子类，不是则报错 if (! type.isAssignableFrom(clazz)) { throw new IllegalStateException("Error when load extension class(interface: " + type + ", class line: " + clazz.getName() + "), class " + clazz.getName() + "is not subtype of interface."); }
// 判断这个加载的类上有没有@Adaptive注解， if (clazz.isAnnotationPresent(Adaptive.class)) { if(cachedAdaptiveClass == null) {
// 将此类作为cacheAdaptiveClass cachedAdaptiveClass = clazz; } else if (! cachedAdaptiveClass.equals(clazz)) {
// 多个adaptive类的实例，报错 throw new IllegalStateException("More than 1 adaptive class found: " + cachedAdaptiveClass.getClass().getName() + ", " + clazz.getClass().getName()); } } else {
// 如果这个类没有@Adaptive注解 try {
// 查看这个类有没有此类型的构造方法（主要是为了Wrapper类使用，如果有说明是个wrapper类） clazz.getConstructor(type); Set<Class<?>> wrappers = cachedWrapperClasses; if (wrappers == null) { cachedWrapperClasses = new ConcurrentHashSet<Class<?>>(); wrappers = cachedWrapperClasses; }
// 将此warpper放入warpper容器中,也就是cacheWrapperClasses里面 wrappers.add(clazz); } catch (NoSuchMethodException e) {
// 不是wrapper类，就会抛出异常执行这里， clazz.getConstructor(); if (name == null || name.length() == 0) {
// 如果name没有写，就是用默认规则生成一个 name = findAnnotationName(clazz); if (name == null || name.length() == 0) { if (clazz.getSimpleName().length() > type.getSimpleName().length() && clazz.getSimpleName().endsWith(type.getSimpleName())) { name = clazz.getSimpleName().substring(0, clazz.getSimpleName().length() - type.getSimpleName().length()).toLowerCase(); } else { throw new IllegalStateException("No such extension name for the class " + clazz.getName() + " in the config " + url); } } } String[] names = NAME_SEPARATOR.split(name); if (names != null && names.length > 0) {
// 看下这个类上有没有@adaptive注解 Activate activate = clazz.getAnnotation(Activate.class); if (activate != null) {
// 存在就在cacheAdaptivates里面添加名称与注解 cachedActivates.put(names[0], activate); } for (String n : names) { if (! cachedNames.containsKey(clazz)) {
// 将此类型的实例与name放入cacheNames cachedNames.put(clazz, n); } Class<?> c = extensionClasses.get(n); if (c == null) {
// 最后往wxtensionClasses添加名称与class extensionClasses.put(n, clazz); } else if (c != clazz) { throw new IllegalStateException("Duplicate extension " + type.getName() + " name " + n + " on " + c.getName() + " and " + clazz.getName()); } } } } } } } catch (Throwable t) { IllegalStateException e = new IllegalStateException("Failed to load extension class(interface: " + type + ", class line: " + line + ") in " + url + ", cause: " + t.getMessage(), t); exceptions.put(line, e); } } } // end of while read lines } finally { reader.close(); } } catch (Throwable t) { logger.error("Exception when load extension class(interface: " + type + ", class file: " + url + ") in " + url, t); } } // end of while urls } } catch (Throwable t) { logger.error("Exception when load extension class(interface: " + type + ", description file: " + fileName + ").", t); } }
classLoader.getResources 方法获取到的Enumeration<java.net.URL>类型的对象，随后就是遍历
dubbo=shuqi.dubbotest.spi.adaptive.DubboAdaptiveExt2 cloud=shuqi.dubbotest.spi.adaptive.SpringCloudAdaptiveExt2 thrift=shuqi.dubbotest.spi.adaptive.ThriftAdaptiveExt2
如果有#,#后面就是注释，前面是业务数据
如果有=,就按照=进行分割，前面是扩展名称，后面是扩展的全限定类名，方便利用反射加载进来
首先判断一下是不是传入类(type)类型的实例，不是的话：报错
如果类上有@Adaptive注解，那么将这个类赋值给擦车的AdaptiveClass，因为是系统指定的适配类，优先级最高。
如果多个类上打了@Adaptive注解会报错，“More than 1 adaptive class found:.....”
如果扩展类上没有打上@Adaptive注解:
第一步:会验证有没有type这个类型作为入参的构造方法 (因为Wrapper,有的类型需要包装一下例如ProtocolFilterWoapper和ProtocolListenerWrapper)
第二步:没有这种类型的构造方法,就是正常的type类型的实例
如果没有声明name名称就根据类名创建一个名称
查看类上有没有@Adaptive注解:
有:将名称与注解放到擦车的Activates这个Map中进行缓存
将扩展类和名称放入cachedNames这个Map中进行缓存，将名称和扩展类的class放入传递进来的extensionClsses中
最后这个extensionClasses会被返回出来被使用。
接下来回到getAdaptiveExtensionClss()方法
private Class<?> getAdaptiveExtensionClass() {
// 触发SPI流程的扫描
getExtensionClasses();
// 如果通过上面的步骤可以获取到cacheAdaptiveClass直接返回，如果不行就自行利用动态代理创建一个
if (cachedAdaptiveClass != null) {
return cachedAdaptiveClass;
}
// 利用动态代理创建一个扩展类
return cachedAdaptiveClass = createAdaptiveExtensionClass();
}
如果cachedAdaptiveClss不为空就返回，那什么情况下不为空？当扩展类打上@Adaptive注解的时候，就会直接将这个类返回。如果没有注解，就得自己生成一个也就是createAdaptiveExtensionClass
private Class<?> createAdaptiveExtensionClass() {
// 创建代码的字符串形式 String code = createAdaptiveExtensionClassCode();
// 寻找类加载器 ClassLoader classLoader = findClassLoader();
// 寻找Compiler的适配器扩展类 com.alibaba.dubbo.common.compiler.Compiler compiler = ExtensionLoader.getExtensionLoader(com.alibaba.dubbo.common.compiler.Compiler.class).getAdaptiveExtension(); // 进行编译成class的实例返回
return compiler.compile(code, classLoader); }
将类以字符串的形式拼接出来，然后利用编译器进行编译，返回编译后的class对象。
/**
* 创建适配器的扩展类的string
*/
private String createAdaptiveExtensionClassCode() { StringBuilder codeBuidler = new StringBuilder();
// 获取这个类的所有方法 Method[] methods = type.getMethods(); boolean hasAdaptiveAnnotation = false; for(Method m : methods) {
// 遍历方法，如果有方法上@Adaptive注解 if(m.isAnnotationPresent(Adaptive.class)) { hasAdaptiveAnnotation = true; break; } } // 完全没有Adaptive方法，则不需要生成Adaptive类 if(! hasAdaptiveAnnotation) throw new IllegalStateException("No adaptive method on extension " + type.getName() + ", refuse to create the adaptive class!"); codeBuidler.append("package " + type.getPackage().getName() + ";"); codeBuidler.append("\nimport " + ExtensionLoader.class.getName() + ";"); codeBuidler.append("\npublic class " + type.getSimpleName() + "$Adpative" + " implements " + type.getCanonicalName() + " {"); for (Method method : methods) { Class<?> rt = method.getReturnType(); Class<?>[] pts = method.getParameterTypes();//获取参数列表的类型 Class<?>[] ets = method.getExceptionTypes();//异常列表的类型 // 获得Adaptive的注解 Adaptive adaptiveAnnotation = method.getAnnotation(Adaptive.class); StringBuilder code = new StringBuilder(512);
// 如果这个方法没有注解，添加不支持调用此方法的异常 if (adaptiveAnnotation == null) { code.append("throw new UnsupportedOperationException(\"method ") .append(method.toString()).append(" of interface ") .append(type.getName()).append(" is not adaptive method!\");"); } else { int urlTypeIndex = -1;
// 寻找列表中类型是URL.class，记录它的位置，数据放到urlTypeIndex中 for (int i = 0; i < pts.length; ++i) { if (pts[i].equals(URL.class)) { urlTypeIndex = i; break; } } // 有类型为URL的参数 if (urlTypeIndex != -1) { // Null Point check String s = String.format("\nif (arg%d == null) throw new IllegalArgumentException(\"url == null\");", urlTypeIndex); code.append(s); s = String.format("\n%s url = arg%d;", URL.class.getName(), urlTypeIndex); code.append(s); } // 参数没有URL类型 else { String attribMethod = null; // 找到参数的URL属性 LBL_PTS: for (int i = 0; i < pts.length; ++i) { Method[] ms = pts[i].getMethods(); for (Method m : ms) { String name = m.getName(); if ((name.startsWith("get") || name.length() > 3) && Modifier.isPublic(m.getModifiers()) && !Modifier.isStatic(m.getModifiers()) && m.getParameterTypes().length == 0 && m.getReturnType() == URL.class) { urlTypeIndex = i; attribMethod = name; break LBL_PTS; } } } if(attribMethod == null) { throw new IllegalStateException("fail to create adative class for interface " + type.getName() + ": not found url parameter or url attribute in parameters of method " + method.getName()); } // Null point check String s = String.format("\nif (arg%d == null) throw new IllegalArgumentException(\"%s argument == null\");", urlTypeIndex, pts[urlTypeIndex].getName()); code.append(s); s = String.format("\nif (arg%d.%s() == null) throw new IllegalArgumentException(\"%s argument %s() == null\");", urlTypeIndex, attribMethod, pts[urlTypeIndex].getName(), attribMethod); code.append(s); s = String.format("%s url = arg%d.%s();",URL.class.getName(), urlTypeIndex, attribMethod); code.append(s); } // 获取Adaptive设置的value String[] value = adaptiveAnnotation.value(); // 没有设置Key，则使用“扩展点接口名的点分隔 作为Key if(value.length == 0) { char[] charArray = type.getSimpleName().toCharArray(); StringBuilder sb = new StringBuilder(128); for (int i = 0; i < charArray.length; i++) { if(Character.isUpperCase(charArray[i])) { if(i != 0) { sb.append("."); } sb.append(Character.toLowerCase(charArray[i])); } else { sb.append(charArray[i]); } } value = new String[] {sb.toString()}; } boolean hasInvocation = false;
// 如果参数列表中有Invocation的实例 for (int i = 0; i < pts.length; ++i) { if (pts[i].getName().equals("com.alibaba.dubbo.rpc.Invocation")) { // Null Point check String s = String.format("\nif (arg%d == null) throw new IllegalArgumentException(\"invocation == null\");", i); code.append(s); s = String.format("\nString methodName = arg%d.getMethodName();", i); code.append(s); hasInvocation = true; break; } } // defaultExtName位注解中的value String defaultExtName = cachedDefaultName; String getNameCode = null; for (int i = value.length - 1; i >= 0; --i) { if(i == value.length - 1) { if(null != defaultExtName) { if(!"protocol".equals(value[i])) if (hasInvocation) getNameCode = String.format("url.getMethodParameter(methodName, \"%s\", \"%s\")", value[i], defaultExtName); else getNameCode = String.format("url.getParameter(\"%s\", \"%s\")", value[i], defaultExtName); else getNameCode = String.format("( url.getProtocol() == null ? \"%s\" : url.getProtocol() )", defaultExtName); } else { if(!"protocol".equals(value[i])) if (hasInvocation) getNameCode = String.format("url.getMethodParameter(methodName, \"%s\", \"%s\")", value[i], defaultExtName); else getNameCode = String.format("url.getParameter(\"%s\")", value[i]); else getNameCode = "url.getProtocol()"; } } else { if(!"protocol".equals(value[i])) if (hasInvocation) getNameCode = String.format("url.getMethodParameter(methodName, \"%s\", \"%s\")", value[i], defaultExtName); else getNameCode = String.format("url.getParameter(\"%s\", %s)", value[i], getNameCode); else getNameCode = String.format("url.getProtocol() == null ? (%s) : url.getProtocol()", getNameCode); } } code.append("\nString extName = ").append(getNameCode).append(";"); // check extName == null? String s = String.format("\nif(extName == null) " + "throw new IllegalStateException(\"Fail to get extension(%s) name from url(\" + url.toString() + \") use keys(%s)\");", type.getName(), Arrays.toString(value)); code.append(s); s = String.format("\n%s extension = (%<s)%s.getExtensionLoader(%s.class).getExtension(extName);", type.getName(), ExtensionLoader.class.getSimpleName(), type.getName()); code.append(s); // return statement if (!rt.equals(void.class)) { code.append("\nreturn "); } s = String.format("extension.%s(", method.getName()); code.append(s); for (int i = 0; i < pts.length; i++) { if (i != 0) code.append(", "); code.append("arg").append(i); } code.append(");"); } codeBuidler.append("\npublic " + rt.getCanonicalName() + " " + method.getName() + "("); for (int i = 0; i < pts.length; i ++) { if (i > 0) { codeBuidler.append(", "); } codeBuidler.append(pts[i].getCanonicalName()); codeBuidler.append(" "); codeBuidler.append("arg" + i); } codeBuidler.append(")"); if (ets.length > 0) { codeBuidler.append(" throws "); for (int i = 0; i < ets.length; i ++) { if (i > 0) { codeBuidler.append(", "); } codeBuidler.append(pts[i].getCanonicalName()); } } codeBuidler.append(" {"); codeBuidler.append(code.toString()); codeBuidler.append("\n}"); } codeBuidler.append("\n}"); if (logger.isDebugEnabled()) { logger.debug(codeBuidler.toString()); } return codeBuidler.toString(); }
首先寻找这个类中所有的方法，查看方法中有没有打@Adaptive注解的，一个没有，直接报错，对于哪些没有加@Adaptive的方法，直接在要创建的Adaptive类上添加此方法不支持操作的异常。在方法中的注解上可以添加value值，如果填写了，使用此值，没有添加将更具类名创建的值作为value值。
public class AdaptiveExt2$Adpative implements shuqi.dubbotest.spi.adaptive.AdaptiveExt2 {
public java.lang.String echo(java.lang.String arg0, com.alibaba.dubbo.common.URL arg1) {
if (arg1 == null) throw new IllegalArgumentException("url == null");
com.alibaba.dubbo.common.URL url = arg1;
String extName = url.getParameter("t", "dubbo");
if (extName == null)
throw new IllegalStateException("Fail to get extension(shuqi.dubbotest.spi.adaptive.AdaptiveExt2) name from url(" + url.toString() + ") use keys([t])");
shuqi.dubbotest.spi.adaptive.AdaptiveExt2 extension = (shuqi.dubbotest.spi.adaptive.AdaptiveExt2) ExtensionLoader.getExtensionLoader(shuqi.dubbotest.spi.adaptive.AdaptiveExt2.class).getExtension(extName);
return extension.echo(arg0, arg1);
}
}
标签：优先级 highlight getname erro net interface 大量 根据 bsp
原文地址：https://www.cnblogs.com/huan30/p/12769683.html
