/*
 * 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.geekbang.thinking.in.spring.dependency.lookup;

import org.springframework.beans.factory.NoUniqueBeanDefinitionException;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Bean;

/**
 * {@link NoUniqueBeanDefinitionException} 示例代码
 *
 * @author <a href="mailto:[email protected]">Mercy</a>
 * @since
 */
public class NoUniqueBeanDefinitionExceptionDemo {

    public static void main(String[] args) {
        // 创建 BeanFactory 容器
        AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext();
        // 将当前类 NoUniqueBeanDefinitionExceptionDemo 作为配置类（Configuration Class）
        applicationContext.register(NoUniqueBeanDefinitionExceptionDemo.class);
        // 启动应用上下文
        applicationContext.refresh();

        try {
            // 由于 Spring 应用上下文存在两个 String 类型的 Bean，通过单一类型查找会抛出异常
            applicationContext.getBean(String.class);
        } catch (NoUniqueBeanDefinitionException e) {
            System.err.printf(" Spring 应用上下文存在%d个 %s 类型的 Bean，具体原因：%s%n",
                    e.getNumberOfBeansFound(),
                    String.class.getName(),
                    e.getMessage());
        }

        // 关闭应用上下文
        applicationContext.close();
    }

    @Bean
    public String bean1() {
        return "1";
    }

    @Bean
    public String bean2() {
        return "2";
    }

    @Bean
    public String bean3() {
        return "3";
    }
}