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/*
* 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.config.spring.extension;
import org.apache.dubbo.common.extension.ExtensionAccessor;
import org.apache.dubbo.common.extension.ExtensionInjector;
import org.apache.dubbo.common.extension.SPI;
import org.apache.dubbo.common.utils.StringUtils;
import org.springframework.beans.factory.ListableBeanFactory;
import org.springframework.context.ApplicationContext;
import java.util.Arrays;
/**
* SpringExtensionInjector
*/
public class SpringExtensionInjector implements ExtensionInjector {
private ApplicationContext context;
@Deprecated
public static void addApplicationContext(final ApplicationContext context) {
}
public static SpringExtensionInjector get(final ExtensionAccessor extensionAccessor) {
return (SpringExtensionInjector) extensionAccessor.getExtension(ExtensionInjector.class, "spring");
}
public ApplicationContext getContext() {
return context;
}
public void init(final ApplicationContext context) {
this.context = context;
}
@Override
@SuppressWarnings("unchecked")
public T getInstance(Class type, String name) {
if (context == null) {
// ignore if spring context is not bound
return null;
}
//check @SPI annotation
if (type.isInterface() && type.isAnnotationPresent(SPI.class)) {
return null;
}
T bean = getOptionalBean(context, name, type);
if (bean != null) {
return bean;
}
//logger.warn("No spring extension (bean) named:" + name + ", try to find an extension (bean) of type " + type.getName());
return null;
}
private T getOptionalBean(final ListableBeanFactory beanFactory, final String name, final Class type) {
if (StringUtils.isEmpty(name)) {
return getOptionalBeanByType(beanFactory, type);
}
if (beanFactory.containsBean(name)) {
return beanFactory.getBean(name, type);
}
return null;
}
private T getOptionalBeanByType(final ListableBeanFactory beanFactory, final Class type) {
String[] beanNamesForType = beanFactory.getBeanNamesForType(type, true, false);
if (beanNamesForType == null) {
return null;
}
if (beanNamesForType.length > 1) {
throw new IllegalStateException("Expect single but found " + beanNamesForType.length + " beans in spring context: " +
Arrays.toString(beanNamesForType));
}
return beanFactory.getBean(beanNamesForType[0], type);
}
}