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com.alibaba.dubbo.common.extension.ExtensionLoader Maven / Gradle / Ivy
/*
* Copyright 1999-2011 Alibaba Group.
*
* Licensed under the Apache License, Version 2.0 (the "License" );
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.alibaba.dubbo.common.extension;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.regex.Pattern;
import com.alibaba.dubbo.common.Constants;
import com.alibaba.dubbo.common.URL;
import com.alibaba.dubbo.common.extension.support.ActivateComparator;
import com.alibaba.dubbo.common.logger.Logger;
import com.alibaba.dubbo.common.logger.LoggerFactory;
import com.alibaba.dubbo.common.utils.ConcurrentHashSet;
import com.alibaba.dubbo.common.utils.ConfigUtils;
import com.alibaba.dubbo.common.utils.Holder;
import com.alibaba.dubbo.common.utils.StringUtils;
/**
* Dubbo使用的扩展点获取。
*
* 自动注入关联扩展点。
* 自动Wrap上扩展点的Wrap类。
* 缺省获得的的扩展点是一个Adaptive Instance。
*
*
* @see JDK5.0的自动发现机制实现
*
* @author william.liangf
* @author ding.lid
*
* @see com.alibaba.dubbo.common.extension.SPI
* @see com.alibaba.dubbo.common.extension.Adaptive
* @see com.alibaba.dubbo.common.extension.Activate
*/
public class ExtensionLoader {
private static final Logger logger = LoggerFactory.getLogger(ExtensionLoader.class);
private static final String SERVICES_DIRECTORY = "META-INF/services/" ;
private static final String DUBBO_DIRECTORY = "META-INF/dubbo/" ;
private static final String DUBBO_INTERNAL_DIRECTORY = DUBBO_DIRECTORY + "internal/" ;
private static final Pattern NAME_SEPARATOR = Pattern.compile("\\s*[,]+\\s*" );
private static final ConcurrentMap, ExtensionLoader> EXTENSION_LOADERS = new ConcurrentHashMap, ExtensionLoader>();
private static final ConcurrentMap, Object> EXTENSION_INSTANCES = new ConcurrentHashMap, Object>();
// ==============================
private final Class type ;
private final ExtensionFactory objectFactory;
private final ConcurrentMap, String> cachedNames = new ConcurrentHashMap, String>();
private final Holder>> cachedClasses = new Holder>>();
private final Map cachedActivates = new ConcurrentHashMap();
private volatile Class cachedAdaptiveClass = null;
private final ConcurrentMap> cachedInstances = new ConcurrentHashMap>();
private String cachedDefaultName;
private final Holder cachedAdaptiveInstance = new Holder();
private volatile Throwable createAdaptiveInstanceError;
private Set> cachedWrapperClasses;
private Map exceptions = new ConcurrentHashMap();
private static boolean withExtensionAnnotation(Class type ) {
return type.isAnnotationPresent(SPI.class);
}
@SuppressWarnings("unchecked" )
public static ExtensionLoader getExtensionLoader(Class type ) {
if (type == null)
throw new IllegalArgumentException("Extension type == null" );
if (!type.isInterface()) {
throw new IllegalArgumentException("Extension type(" + type + ") is not interface!" );
}
if (!withExtensionAnnotation(type )) {
throw new IllegalArgumentException("Extension type(" + type +
") is not extension, because WITHOUT @" + SPI.class.getSimpleName() + " Annotation!" );
}
ExtensionLoader loader = (ExtensionLoader) EXTENSION_LOADERS.get(type );
if (loader == null) {
EXTENSION_LOADERS.putIfAbsent(type , new ExtensionLoader(type ));
loader = (ExtensionLoader) EXTENSION_LOADERS.get(type );
}
return loader;
}
private ExtensionLoader(Class type ) {
this.type = type ;
objectFactory = (type == ExtensionFactory.class ? null : ExtensionLoader.getExtensionLoader(ExtensionFactory.class).getAdaptiveExtension());
}
public String getExtensionName(T extensionInstance) {
return getExtensionName(extensionInstance.getClass());
}
public String getExtensionName(Class extensionClass) {
return cachedNames.get(extensionClass);
}
/**
* This is equivalent to * getActivateExtension(url, key, null);
*
*
* @param url url
* @param key url parameter key which used to get extension point names
* @return extension list which are activated.
* @see
*/
public List getActivateExtension(URL url, String key) {
return getActivateExtension(url, key, null);
}
/**
* This is equivalent to * getActivateExtension(url, values, null);
*
*
* @see
* @param url url
* @param values extension point names
* @return extension list which are activated
*/
public List getActivateExtension(URL url, String[] values) {
return getActivateExtension(url, values, null);
}
/**
* This is equivalent to * getActivateExtension(url, url.getParameter(key).split("," ), null);
*
*
* @see
* @param url url
* @param key url parameter key which used to get extension point names
* @param group group
* @return extension list which are activated.
*/
public List getActivateExtension(URL url, String key, String group) {
String value = url.getParameter(key);
return getActivateExtension(url, value == null || value.length() == 0 ? null : Constants.COMMA_SPLIT_PATTERN.split(value), group);
}
/**
* Get activate extensions.
*
* @see com.alibaba.dubbo.common.extension.Activate
* @param url url
* @param values extension point names
* @param group group
* @return extension list which are activated
*/
public List getActivateExtension(URL url, String[] values, String group) {
List exts = new ArrayList();
List names = values == null ? new ArrayList(0) : Arrays.asList(values);
if (! names.contains(Constants.REMOVE_VALUE_PREFIX + Constants.DEFAULT_KEY)) {
getExtensionClasses();
for (Map.Entry entry : cachedActivates.entrySet()) {
String name = entry.getKey();
Activate activate = entry.getValue();
if (isMatchGroup(group, activate.group())) {
T ext = getExtension(name);
if (! names.contains(name)
&& ! names.contains(Constants.REMOVE_VALUE_PREFIX + name)
&& isActive(activate, url)) {
exts.add(ext);
}
}
}
Collections.sort(exts, ActivateComparator.COMPARATOR);
}
List usrs = new ArrayList();
for (int i = 0; i < names.size(); i ++) {
String name = names.get(i);
if (! name.startsWith(Constants.REMOVE_VALUE_PREFIX)
&& ! names.contains(Constants.REMOVE_VALUE_PREFIX + name)) {
if (Constants.DEFAULT_KEY.equals(name)) {
if (usrs.size() > 0) {
exts.addAll(0, usrs);
usrs.clear();
}
} else {
T ext = getExtension(name);
usrs.add(ext);
}
}
}
if (usrs.size() > 0) {
exts.addAll(usrs);
}
return exts;
}
private boolean isMatchGroup(String group, String[] groups) {
if (group == null || group.length() == 0) {
return true ;
}
if (groups != null && groups.length > 0) {
for (String g : groups) {
if (group.equals(g)) {
return true ;
}
}
}
return false ;
}
private boolean isActive(Activate activate, URL url) {
String[] keys = activate.value();
if (keys == null || keys.length == 0) {
return true ;
}
for (String key : keys) {
for (Map.Entry entry : url.getParameters().entrySet()) {
String k = entry.getKey();
String v = entry.getValue();
if ((k.equals(key) || k.endsWith("." + key))
&& ConfigUtils.isNotEmpty(v)) {
return true ;
}
}
}
return false ;
}
/**
* 返回扩展点实例，如果没有指定的扩展点或是还没加载（即实例化）则返回null。注意：此方法不会触发扩展点的加载。
*
* 一般应该调用{@link
*
* @see
*/
@SuppressWarnings("unchecked" )
public T getLoadedExtension(String name) {
if (name == null || name.length() == 0)
throw new IllegalArgumentException("Extension name == null" );
Holder holder = cachedInstances.get(name);
if (holder == null) {
cachedInstances.putIfAbsent(name, new Holder());
holder = cachedInstances.get(name);
}
return (T) holder.get();
}
/**
* 返回已经加载的扩展点的名字。
*
* 一般应该调用{@link
*
* @see
*/
public Set getLoadedExtensions return Collections.unmodifiableSet(new TreeSet(cachedInstances.keySet()));
}
/**
* 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 {@link IllegalStateException}.
*
* @param name
* @return
*/
@SuppressWarnings("unchecked" )
public T getExtension(String name) {
if (name == null || name.length() == 0)
throw new IllegalArgumentException("Extension name == null" );
if ("true" .equals(name)) {
return getDefaultExtension();
}
Holder holder = cachedInstances.get(name);
if (holder == null) {
cachedInstances.putIfAbsent(name, new Holder());
holder = cachedInstances.get(name);
}
Object instance = holder.get();
if (instance == null) {
synchronized (holder) {
instance = holder.get();
if (instance == null) {
instance = createExtension(name);
holder.set(instance);
}
}
}
return (T) instance;
}
/**
* 返回缺省的扩展，如果没有设置则返回null。
*/
public T getDefaultExtension if (null == cachedDefaultName || cachedDefaultName.length() == 0
|| "true" .equals(cachedDefaultName)) {
return null;
}
return getExtension(cachedDefaultName);
}
public boolean hasExtension(String name) {
if (name == null || name.length() == 0)
throw new IllegalArgumentException("Extension name == null" );
try {
return getExtensionClass(name) != null;
} catch (Throwable t) {
return false ;
}
}
public Set getSupportedExtensions > clazzes = getExtensionClasses();
return Collections.unmodifiableSet(new TreeSet(clazzes.keySet()));
}
/**
* 返回缺省的扩展点名，如果没有设置缺省则返回null。
*/
public String getDefaultExtensionName return cachedDefaultName;
}
/**
* 编程方式添加新扩展点。
*
* @param name 扩展点名
* @param clazz 扩展点类
* @throws IllegalStateException 要添加扩展点名已经存在。
*/
public void addExtension(String name, Class clazz) {
getExtensionClasses(); // load classes
if (!type.isAssignableFrom(clazz)) {
throw new IllegalStateException("Input type " +
clazz + "not implement Extension " + type );
}
if (clazz.isInterface()) {
throw new IllegalStateException("Input type " +
clazz + "can not be interface!" );
}
if (!clazz.isAnnotationPresent(Adaptive.class)) {
if (StringUtils.isBlank(name)) {
throw new IllegalStateException("Extension name is blank (Extension " + type + ")!" );
}
if (cachedClasses.get().containsKey(name)) {
throw new IllegalStateException("Extension name " +
name + " already existed(Extension " + type + ")!" );
}
cachedNames.put(clazz, name);
cachedClasses.get().put(name, clazz);
}
else {
if (cachedAdaptiveClass != null) {
throw new IllegalStateException("Adaptive Extension already existed(Extension " + type + ")!" );
}
cachedAdaptiveClass = clazz;
}
}
/**
* 编程方式添加替换已有扩展点。
*
* @param name 扩展点名
* @param clazz 扩展点类
* @throws IllegalStateException 要添加扩展点名已经存在。
* @deprecated 不推荐应用使用，一般只在测试时可以使用
*/
@Deprecated
public void replaceExtension(String name, Class clazz) {
getExtensionClasses(); // load classes
if (!type.isAssignableFrom(clazz)) {
throw new IllegalStateException("Input type " +
clazz + "not implement Extension " + type );
}
if (clazz.isInterface()) {
throw new IllegalStateException("Input type " +
clazz + "can not be interface!" );
}
if (!clazz.isAnnotationPresent(Adaptive.class)) {
if (StringUtils.isBlank(name)) {
throw new IllegalStateException("Extension name is blank (Extension " + type + ")!" );
}
if (!cachedClasses.get().containsKey(name)) {
throw new IllegalStateException("Extension name " +
name + " not existed(Extension " + type + ")!" );
}
cachedNames.put(clazz, name);
cachedClasses.get().put(name, clazz);
cachedInstances.remove(name);
}
else {
if (cachedAdaptiveClass == null) {
throw new IllegalStateException("Adaptive Extension not existed(Extension " + type + ")!" );
}
cachedAdaptiveClass = clazz;
cachedAdaptiveInstance.set(null);
}
}
@SuppressWarnings("unchecked" )
public T getAdaptiveExtension if (instance == null) {
if (createAdaptiveInstanceError == null) {
synchronized (cachedAdaptiveInstance) {
instance = cachedAdaptiveInstance.get();
if (instance == null) {
try {
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;
}
private IllegalStateException findException(String name) {
for (Map.Entry entry : exceptions.entrySet()) {
if (entry.getKey().toLowerCase().contains(name.toLowerCase())) {
return entry.getValue();
}
}
StringBuilder buf = new StringBuilder("No such extension " + type.getName() + " by name " + name);
int i = 1;
for (Map.Entry entry : exceptions.entrySet()) {
if (i == 1) {
buf.append(", possible causes: " );
}
buf.append("\r\n(" );
buf.append(i ++);
buf.append(") " );
buf.append(entry.getKey());
buf.append(":\r\n" );
buf.append(StringUtils.toString(entry.getValue()));
}
return new IllegalStateException(buf.toString());
}
@SuppressWarnings("unchecked" )
private T createExtension(String name) {
Class clazz = getExtensionClasses().get(name);
if (clazz == null) {
throw findException(name);
}
try {
T instance = (T) EXTENSION_INSTANCES.get(clazz);
if (instance == null) {
EXTENSION_INSTANCES.putIfAbsent(clazz, (T) clazz.newInstance());
instance = (T) EXTENSION_INSTANCES.get(clazz);
}
injectExtension(instance);
Set> wrapperClasses = cachedWrapperClasses;
if (wrapperClasses != null && wrapperClasses.size() > 0) {
for (Class wrapperClass : wrapperClasses) {
instance = injectExtension((T) wrapperClass.getConstructor(type ).newInstance(instance));
}
}
return instance;
} catch (Throwable t) {
throw new IllegalStateException("Extension instance(name: " + name + ", class: " +
type + ") could not be instantiated: " + t.getMessage(), t);
}
}
private T injectExtension(T instance) {
try {
if (objectFactory != null) {
for (Method method : instance.getClass().getMethods()) {
if (method.getName().startsWith("set" )
&& method.getParameterTypes().length == 1
&& Modifier.isPublic(method.getModifiers())) {
Class pt = method.getParameterTypes()[0];
try {
String property = method.getName().length() > 3 ? method.getName().substring(3, 4).toLowerCase() + method.getName().substring(4) : "" ;
Object object = objectFactory.getExtension(pt, property);
if (object != null) {
method.invoke(instance, object);
}
} catch (Exception e) {
logger.error("fail to inject via method " + method.getName()
+ " of interface " + type.getName() + ": " + e.getMessage(), e);
}
}
}
}
} catch (Exception e) {
logger.error(e.getMessage(), e);
}
return instance;
}
private Class getExtensionClass(String name) {
if (type == null)
throw new IllegalArgumentException("Extension type == null" );
if (name == null)
throw new IllegalArgumentException("Extension name == null" );
Class clazz = getExtensionClasses().get(name);
if (clazz == null)
throw new IllegalStateException("No such extension \"" + name + "\" for " + type.getName() + "!" );
return clazz;
}
private Map> getExtensionClasses > classes = cachedClasses.get();
if (classes == null) {
synchronized (cachedClasses) {
classes = cachedClasses.get();
if (classes == null) {
classes = loadExtensionClasses();
cachedClasses.set(classes);
}
}
}
return classes;
}
// 此方法已经getExtensionClasses方法同步过。
private Map> loadExtensionClasses 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));
}
if (names.length == 1) cachedDefaultName = names[0];
}
}
Map> extensionClasses = new HashMap>();
loadFile(extensionClasses, DUBBO_INTERNAL_DIRECTORY);
loadFile(extensionClasses, DUBBO_DIRECTORY);
loadFile(extensionClasses, SERVICES_DIRECTORY);
return extensionClasses;
}
private void loadFile(Map> extensionClasses, String dir) {
String fileName = dir + type.getName();
try {
Enumeration 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) {
final int ci = line.indexOf('#' );
if (ci >= 0) line = line.substring(0, ci);
line = line.trim();
if (line.length() > 0) {
try {
String name = null;
int i = line.indexOf('=' );
if (i > 0) {
name = line.substring(0, i).trim();
line = line.substring(i + 1).trim();
}
if (line.length() > 0) {
Class clazz = Class.forName(line, true , classLoader);
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." );
}
if (clazz.isAnnotationPresent(Adaptive.class)) {
if (cachedAdaptiveClass == null) {
cachedAdaptiveClass = clazz;
} else if (! cachedAdaptiveClass.equals(clazz)) {
throw new IllegalStateException("More than 1 adaptive class found: "
+ cachedAdaptiveClass.getClass().getName()
+ ", " + clazz.getClass().getName());
}
} else {
try {
clazz.getConstructor(type );
Set> wrappers = cachedWrapperClasses;
if (wrappers == null) {
cachedWrapperClasses = new ConcurrentHashSet>();
wrappers = cachedWrapperClasses;
}
wrappers.add(clazz);
} catch (NoSuchMethodException e) {
clazz.getConstructor();
if (name == null || name.length() == 0) {
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) {
Activate activate = clazz.getAnnotation(Activate.class);
if (activate != null) {
cachedActivates.put(names[0], activate);
}
for (String n : names) {
if (! cachedNames.containsKey(clazz)) {
cachedNames.put(clazz, n);
}
Class c = extensionClasses.get(n);
if (c == null) {
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);
}
}
@SuppressWarnings("deprecation" )
private String findAnnotationName(Class clazz) {
com.alibaba.dubbo.common.Extension extension = clazz.getAnnotation(com.alibaba.dubbo.common.Extension.class);
if (extension == null) {
String name = clazz.getSimpleName();
if (name.endsWith(type.getSimpleName())) {
name = name.substring(0, name.length() - type.getSimpleName().length());
}
return name.toLowerCase();
}
return extension.value();
}
@SuppressWarnings("unchecked" )
private T createAdaptiveExtension return injectExtension((T) getAdaptiveExtensionClass().newInstance());
} catch (Exception e) {
throw new IllegalStateException("Can not create adaptive extenstion " + type + ", cause: " + e.getMessage(), e);
}
}
private Class getAdaptiveExtensionClass if (cachedAdaptiveClass != null) {
return cachedAdaptiveClass;
}
return cachedAdaptiveClass = createAdaptiveExtensionClass();
}
private Class createAdaptiveExtensionClass return compiler.compile(code, classLoader);
}
private String createAdaptiveExtensionClassCode false ;
for (Method m : methods) {
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();
Class[] ets = method.getExceptionTypes();
Adaptive adaptiveAnnotation = method.getAnnotation(Adaptive.class);
StringBuilder code = new StringBuilder(512);
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;
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);
}
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 ;
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 ;
}
}
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 = (% 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(ets[i].getCanonicalName());
}
}
codeBuidler.append(" {");
codeBuidler.append(code.toString());
codeBuidler.append(" \n}");
}
codeBuidler.append(" \n}");
if (logger.isDebugEnabled()) {
logger.debug(codeBuidler.toString());
}
return codeBuidler.toString();
}
private static ClassLoader findClassLoader() {
return ExtensionLoader.class.getClassLoader();
}
@Override
public String toString() {
return this.getClass().getName() + " [" + type.getName() + " ]";
}
}
