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Spring Framework example source code file (BeanFactoryLocator.java)

This example Spring Framework source code file (BeanFactoryLocator.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Spring Framework tags/keywords

beanfactorylocator, beanfactorylocator, beanfactoryreference, beanfactoryreference, beansexception, beansexception

The Spring Framework BeanFactoryLocator.java source code

/*
 * 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
 *
 *      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.springframework.beans.factory.access;

import org.springframework.beans.BeansException;

/**
 * Defines a contract for the lookup, use, and release of a
 * {@link org.springframework.beans.factory.BeanFactory},
 * or a <code>BeanFactory subclass such as an
 * {@link org.springframework.context.ApplicationContext}.
 *
 * <p>Where this interface is implemented as a singleton class such as
 * {@link SingletonBeanFactoryLocator}, the Spring team <strong>strongly
 * suggests that it be used sparingly and with caution. By far the vast majority
 * of the code inside an application is best written in a Dependency Injection
 * style, where that code is served out of a
 * <code>BeanFactory/ApplicationContext container, and has
 * its own dependencies supplied by the container when it is created. However,
 * even such a singleton implementation sometimes has its use in the small glue
 * layers of code that is sometimes needed to tie other code together. For
 * example, third party code may try to construct new objects directly, without
 * the ability to force it to get these objects out of a <code>BeanFactory.
 * If the object constructed by the third party code is just a small stub or
 * proxy, which then uses an implementation of this class to get a
 * <code>BeanFactory from which it gets the real object, to which it
 * delegates, then proper Dependency Injection has been achieved.
 *
 * <p>As another example, in a complex J2EE app with multiple layers, with each
 * layer having its own <code>ApplicationContext definition (in a
 * hierarchy), a class like <code>SingletonBeanFactoryLocator may be used
 * to demand load these contexts.
 *
 * @author Colin Sampaleanu
 * @see org.springframework.beans.factory.BeanFactory
 * @see org.springframework.context.access.DefaultLocatorFactory
 * @see org.springframework.context.ApplicationContext
 */
public interface BeanFactoryLocator {

	/**
	 * Use the {@link org.springframework.beans.factory.BeanFactory} (or derived
	 * interface such as {@link org.springframework.context.ApplicationContext})
	 * specified by the <code>factoryKey parameter.
	 * <p>The definition is possibly loaded/created as needed.
	 * @param factoryKey a resource name specifying which <code>BeanFactory the
	 * <code>BeanFactoryLocator must return for usage. The actual meaning of the
	 * resource name is specific to the implementation of <code>BeanFactoryLocator.
	 * @return the <code>BeanFactory instance, wrapped as a {@link BeanFactoryReference} object
	 * @throws BeansException if there is an error loading or accessing the <code>BeanFactory
	 */
	BeanFactoryReference useBeanFactory(String factoryKey) throws BeansException;

}

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