| /* | |
| * 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.Reference; | |
| import com.alibaba.dubbo.common.utils.StringUtils; | |
| /** | |
| * Dubbo使用的扩展点获取。<p> | |
| * <ul> | |
| * <li>自动注入关联扩展点。</li> | |
| * <li>自动Wrap上扩展点的Wrap类。</li> | |
| * <li>缺省获得的的扩展点是一个Adaptive Instance。 | |
| * </ul> | |
| * | |
| * @see <a href="http://java.sun.com/j2se/1.5.0/docs/guide/jar/jar.html#Service%20Provider">JDK5.0的自动发现机制实现</a> | |
| * | |
| * @author william.liangf | |
| * @author ding.lid | |
| * | |
| * @see Adaptive | |
| */ | |
| public class ExtensionLoader<T> { | |
| 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 Pattern NAME_SEPARATOR = Pattern.compile("\\s*[,]+\\s*"); | |
| private static final ConcurrentMap<Class<?>, ExtensionLoader<?>> EXTENSION_LOADERS = new ConcurrentHashMap<Class<?>, ExtensionLoader<?>>(); | |
| private static final ConcurrentMap<Class<?>, Object> EXTENSION_INSTANCES = new ConcurrentHashMap<Class<?>, Object>(); | |
| private final Class<?> type; | |
| private final ConcurrentMap<Class<?>, String> cachedNames = new ConcurrentHashMap<Class<?>, String>(); | |
| private final Reference<Map<String, Class<?>>> cachedClasses = new Reference<Map<String,Class<?>>>(); | |
| private final Map<String, Activate> cachedActivates = new ConcurrentHashMap<String, Activate>(); | |
| private final ConcurrentMap<String, Reference<Object>> cachedInstances = new ConcurrentHashMap<String, Reference<Object>>(); | |
| private volatile Class<?> cachedAdaptiveClass = null; | |
| private final Reference<Object> cachedAdaptiveInstance = new Reference<Object>(); | |
| private volatile Throwable createAdaptiveInstanceError; | |
| private Set<Class<?>> cachedWrapperClasses; | |
| private String cachedDefaultName; | |
| private Map<String, IllegalStateException> exceptions = new ConcurrentHashMap<String, IllegalStateException>(); | |
| private final ExtensionFactory objectFactory; | |
| private static <T> boolean withExtensionAnnotation(Class<T> type) { | |
| return type.isAnnotationPresent(SPI.class); | |
| } | |
| @SuppressWarnings("unchecked") | |
| public static <T> ExtensionLoader<T> getExtensionLoader(Class<T> type) { | |
| if (type == null) | |
| throw new IllegalArgumentException("Extension type == null"); | |
| if(!withExtensionAnnotation(type)) { | |
| throw new IllegalArgumentException("Extension type(" + type + | |
| ") is not extension, because WITHOUT @" + SPI.class.getSimpleName() + " Annotation!"); | |
| } | |
| 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; | |
| } | |
| 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 <pre> | |
| * getActivateExtension(url, key, null); | |
| * </pre> | |
| * | |
| * @see #getActivateExtension(com.alibaba.dubbo.common.URL, String, String) | |
| * @param url url | |
| * @param key url parameter key which used to get extension point names | |
| * @return extension list which are activated. | |
| */ | |
| public List<T> getActivateExtension(URL url, String key) { | |
| return getActivateExtension(url, key, null); | |
| } | |
| /** | |
| * This is equivalent to <pre> | |
| * getActivateExtension(url, values, null); | |
| * </pre> | |
| * | |
| * @see #getActivateExtension(com.alibaba.dubbo.common.URL, String[], String) | |
| * @param url url | |
| * @param values extension point names | |
| * @return extension list which are activated | |
| */ | |
| public List<T> getActivateExtension(URL url, String[] values) { | |
| return getActivateExtension(url, values, null); | |
| } | |
| /** | |
| * This is equivalent to <pre> | |
| * getActivateExtension(url, url.getParameter(key).split(","), null); | |
| * </pre> | |
| * | |
| * @see #getActivateExtension(com.alibaba.dubbo.common.URL, String[], String) | |
| * @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<T> 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 Activate | |
| * @param url url | |
| * @param values extension point names | |
| * @param group group | |
| * @return extension list which are activated | |
| */ | |
| public List<T> getActivateExtension(URL url, String[] values, String group) { | |
| List<T> exts = new ArrayList<T>(); | |
| List<String> names = values == null ? new ArrayList<String>(0) : Arrays.asList(values); | |
| if (! names.contains(Constants.REMOVE_VALUE_PREFIX + Constants.DEFAULT_KEY)) { | |
| getExtensionClasses(); | |
| for (Map.Entry<String, Activate> 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); | |
| for (String name : names) { | |
| if (! name.startsWith(Constants.REMOVE_VALUE_PREFIX)) { | |
| T ext = getExtension(name); | |
| exts.add(ext); | |
| } | |
| } | |
| 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<String, String> 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; | |
| } | |
| @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(); | |
| } | |
| Reference<Object> reference = cachedInstances.get(name); | |
| if (reference == null) { | |
| cachedInstances.putIfAbsent(name, new Reference<Object>()); | |
| reference = cachedInstances.get(name); | |
| } | |
| Object instance = reference.get(); | |
| if (instance == null) { | |
| synchronized (reference) { | |
| instance = reference.get(); | |
| if (instance == null) { | |
| instance = createExtension(name); | |
| reference.set(instance); | |
| } | |
| } | |
| } | |
| return (T) instance; | |
| } | |
| /** | |
| * 返回缺省的扩展，如果没有设置则返回<code>null</code>。 | |
| */ | |
| public T getDefaultExtension() { | |
| getExtensionClasses(); | |
| 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<String> getSupportedExtensions() { | |
| Map<String, Class<?>> clazzes = getExtensionClasses(); | |
| return Collections.unmodifiableSet(new TreeSet<String>(clazzes.keySet())); | |
| } | |
| public Set<String> getLoadedExtensions() { | |
| return Collections.unmodifiableSet(new TreeSet<String>(cachedInstances.keySet())); | |
| } | |
| /** | |
| * 返回缺省的扩展点名，如果没有设置缺省则返回<code>null</code>。 | |
| */ | |
| public String getDefaultExtensionName() { | |
| getExtensionClasses(); | |
| return cachedDefaultName; | |
| } | |
| @SuppressWarnings("unchecked") | |
| public T getAdaptiveExtension() { | |
| Object instance = cachedAdaptiveInstance.get(); | |
| 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; | |
| rethrowAsRuntime(t, "fail to create adaptive instance: "); | |
| } | |
| } | |
| } | |
| } | |
| else { | |
| rethrowAsRuntime(createAdaptiveInstanceError, "fail to create adaptive instance: "); | |
| } | |
| } | |
| return (T) instance; | |
| } | |
| private static void rethrowAsRuntime(Throwable t, String message) { | |
| if(t instanceof RuntimeException) | |
| throw (RuntimeException)t; | |
| else | |
| throw new IllegalStateException(message + t.toString(), t); | |
| } | |
| private IllegalStateException findException(String name) { | |
| for (Map.Entry<String, IllegalStateException> 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 + ", possible causes: "); | |
| int i = 1; | |
| for (Map.Entry<String, IllegalStateException> entry : exceptions.entrySet()) { | |
| 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<Class<?>> 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<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; | |
| } | |
| private Map<String, Class<?>> loadExtensionClasses() { | |
| 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)); | |
| } | |
| if(names.length == 1) cachedDefaultName = names[0]; | |
| } | |
| } | |
| Map<String, Class<?>> extensionClasses = new HashMap<String, Class<?>>(); | |
| loadFile(extensionClasses, DUBBO_DIRECTORY); | |
| loadFile(extensionClasses, SERVICES_DIRECTORY); | |
| return extensionClasses; | |
| } | |
| 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) { | |
| 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(); | |
| } | |
| 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<Class<?>> wrappers = cachedWrapperClasses; | |
| if (wrappers == null) { | |
| cachedWrapperClasses = new ConcurrentHashSet<Class<?>>(); | |
| 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() { | |
| try { | |
| return injectExtension((T) getAdaptiveExtensionClass().newInstance()); | |
| } catch (Exception e) { | |
| throw new IllegalStateException("Can not create adaptive extenstion " + type + ", cause: " + e.getMessage(), e); | |
| } | |
| } | |
| private Class<?> getAdaptiveExtensionClass() { | |
| getExtensionClasses(); | |
| if (cachedAdaptiveClass != null) { | |
| return cachedAdaptiveClass; | |
| } | |
| return cachedAdaptiveClass = createAdaptiveExtensionClass(); | |
| } | |
| private Class<?> createAdaptiveExtensionClass() { | |
| String code = createAdaptiveExtensionClassCode(); | |
| ClassLoader classLoader = findClassLoader(); | |
| com.alibaba.dubbo.common.compiler.Compiler compiler = ExtensionLoader.getExtensionLoader(com.alibaba.dubbo.common.compiler.Compiler.class).getAdaptiveExtension(); | |
| return compiler.compile(code, classLoader); | |
| } | |
| private String createAdaptiveExtensionClassCode() { | |
| StringBuilder codeBuidler = new StringBuilder(); | |
| Method[] methods = type.getMethods(); | |
| boolean hasAdaptiveAnnotation = 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.getPackage().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()}; | |
| } | |
| String m = adaptiveAnnotation.method(); | |
| 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 (m != null && m.length() > 0) | |
| getNameCode = String.format("url.getMethodParameter(arg%s, \"%s\", \"%s\")", m, 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 (m != null && m.length() > 0) | |
| getNameCode = String.format("url.getMethodParameter(arg%s, \"%s\", \"%s\")", m, value[i], defaultExtName); | |
| else | |
| getNameCode = String.format("url.getParameter(\"%s\")", value[i]); | |
| else | |
| getNameCode = "url.getProtocol()"; | |
| } | |
| } | |
| else { | |
| if(!"protocol".equals(value[i])) | |
| if (m != null && m.length() > 0) | |
| getNameCode = String.format("url.getMethodParameter(arg%s, \"%s\", \"%s\")", m, 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(); | |
| } | |
| private static ClassLoader findClassLoader() { | |
| ClassLoader classLoader = Thread.currentThread().getContextClassLoader(); | |
| if (classLoader != null) { | |
| return classLoader; | |
| } | |
| classLoader = ExtensionLoader.class.getClassLoader(); | |
| return classLoader; | |
| } | |
| @Override | |
| public String toString() { | |
| return this.getClass().getName() + "[" + type.getName() + "]"; | |
| } | |
| } |