spring ServiceFactoryBean 源码
spring ServiceFactoryBean 代码
文件路径：/spring-beans/src/main/java/org/springframework/beans/factory/serviceloader/ServiceFactoryBean.java
/*
* Copyright 2002-2007 the original author or authors.
*
* 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
*
* https://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.springframework.beans.factory.serviceloader;
import java.util.Iterator;
import java.util.ServiceLoader;
import org.springframework.beans.factory.BeanClassLoaderAware;
import org.springframework.lang.Nullable;
/**
* {@link org.springframework.beans.factory.FactoryBean} that exposes the
* 'primary' service for the configured service class, obtained through
* the JDK 1.6 {@link java.util.ServiceLoader} facility.
*
* @author Juergen Hoeller
* @since 2.5
* @see java.util.ServiceLoader
*/
public class ServiceFactoryBean extends AbstractServiceLoaderBasedFactoryBean implements BeanClassLoaderAware {
@Override
protected Object getObjectToExpose(ServiceLoader<?> serviceLoader) {
Iterator<?> it = serviceLoader.iterator();
if (!it.hasNext()) {
throw new IllegalStateException(
"ServiceLoader could not find service for type [" + getServiceType() + "]");
}
return it.next();
}
@Override
@Nullable
public Class<?> getObjectType() {
return getServiceType();
}
}
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