org.apache.dubbo.common.utils.ServiceAnnotationResolver Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of dubbo Show documentation
Show all versions of dubbo Show documentation
The all in one project of dubbo
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.dubbo.common.utils;
import org.apache.dubbo.config.annotation.DubboService;
import org.apache.dubbo.config.annotation.Service;
import java.lang.annotation.Annotation;
import java.util.List;
import static java.lang.String.format;
import static java.util.Arrays.asList;
import static java.util.Collections.unmodifiableList;
import static org.apache.dubbo.common.utils.AnnotationUtils.getAttribute;
import static org.apache.dubbo.common.utils.ArrayUtils.isNotEmpty;
import static org.apache.dubbo.common.utils.ClassUtils.isGenericClass;
import static org.apache.dubbo.common.utils.ClassUtils.resolveClass;
import static org.apache.dubbo.common.utils.StringUtils.isEmpty;
/**
* The resolver class for {@link Service @Service}
*
* @see Service
* @see com.alibaba.dubbo.config.annotation.Service
* @since 2.7.6
*/
public class ServiceAnnotationResolver {
/**
* The annotation {@link Class classes} of Dubbo Service (read-only)
*
* @since 2.7.9
*/
public static List> SERVICE_ANNOTATION_CLASSES = unmodifiableList(asList(DubboService.class, Service.class, com.alibaba.dubbo.config.annotation.Service.class));
private final Annotation serviceAnnotation;
private final Class serviceType;
public ServiceAnnotationResolver(Class serviceType) throws IllegalArgumentException {
this.serviceType = serviceType;
this.serviceAnnotation = getServiceAnnotation(serviceType);
}
private Annotation getServiceAnnotation(Class serviceType) {
Annotation serviceAnnotation = null;
for (Class serviceAnnotationClass : SERVICE_ANNOTATION_CLASSES) {
serviceAnnotation = serviceType.getAnnotation(serviceAnnotationClass);
if (serviceAnnotation != null) {
break;
}
}
if (serviceAnnotation == null) {
throw new IllegalArgumentException(format("Any annotation of [%s] can't be annotated in the service type[%s].",
SERVICE_ANNOTATION_CLASSES,
serviceType.getName()
));
}
return serviceAnnotation;
}
/**
* Resolve the class name of interface
*
* @return if not found, return null
*/
public String resolveInterfaceClassName() {
Class interfaceClass;
// first, try to get the value from "interfaceName" attribute
String interfaceName = resolveAttribute("interfaceName");
if (isEmpty(interfaceName)) { // If not found, try "interfaceClass"
interfaceClass = resolveAttribute("interfaceClass");
} else {
interfaceClass = resolveClass(interfaceName, getClass().getClassLoader());
}
if (isGenericClass(interfaceClass)) {
interfaceName = interfaceClass.getName();
} else {
interfaceName = null;
}
if (isEmpty(interfaceName)) { // If not fund, try to get the first interface from the service type
Class[] interfaces = serviceType.getInterfaces();
if (isNotEmpty(interfaces)) {
interfaceName = interfaces[0].getName();
}
}
return interfaceName;
}
public String resolveVersion() {
return resolveAttribute("version");
}
public String resolveGroup() {
return resolveAttribute("group");
}
private T resolveAttribute(String attributeName) {
return getAttribute(serviceAnnotation, attributeName);
}
public Annotation getServiceAnnotation() {
return serviceAnnotation;
}
public Class getServiceType() {
return serviceType;
}
}