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Spring Framework example source code file (SingletonBeanRegistry.java)

This example Spring Framework source code file (SingletonBeanRegistry.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

object, object, singletonbeanregistry, singletonbeanregistry, string, string

The Spring Framework SingletonBeanRegistry.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.config;

/**
 * Interface that defines a registry for shared bean instances.
 * Can be implemented by {@link org.springframework.beans.factory.BeanFactory}
 * implementations in order to expose their singleton management facility
 * in a uniform manner.
 *
 * <p>The {@link ConfigurableBeanFactory} interface extends this interface.
 *
 * @author Juergen Hoeller
 * @since 2.0
 * @see ConfigurableBeanFactory
 * @see org.springframework.beans.factory.support.DefaultSingletonBeanRegistry
 * @see org.springframework.beans.factory.support.AbstractBeanFactory
 */
public interface SingletonBeanRegistry {

	/**
	 * Register the given existing object as singleton in the bean registry,
	 * under the given bean name.
	 * <p>The given instance is supposed to be fully initialized; the registry
	 * will not perform any initialization callbacks (in particular, it won't
	 * call InitializingBean's <code>afterPropertiesSet method).
	 * The given instance will not receive any destruction callbacks
	 * (like DisposableBean's <code>destroy method) either.
	 * <p>If running within a full BeanFactory: Register a bean definition
	 * instead of an existing instance if your bean is supposed to receive
	 * initialization and/or destruction callbacks.</b>
	 * <p>Typically invoked during registry configuration, but can also be used
	 * for runtime registration of singletons. As a consequence, a registry
	 * implementation should synchronize singleton access; it will have to do
	 * this anyway if it supports a BeanFactory's lazy initialization of singletons.
	 * @param beanName the name of the bean
	 * @param singletonObject the existing singleton object
	 * @see org.springframework.beans.factory.InitializingBean#afterPropertiesSet
	 * @see org.springframework.beans.factory.DisposableBean#destroy
	 * @see org.springframework.beans.factory.support.BeanDefinitionRegistry#registerBeanDefinition
	 */
	void registerSingleton(String beanName, Object singletonObject);

	/**
	 * Return the (raw) singleton object registered under the given name.
	 * <p>Only checks already instantiated singletons; does not return an Object
	 * for singleton bean definitions which have not been instantiated yet.
	 * <p>The main purpose of this method is to access manually registered singletons
	 * (see {@link #registerSingleton}). Can also be used to access a singleton
	 * defined by a bean definition that already been created, in a raw fashion.
	 * @param beanName the name of the bean to look for
	 * @return the registered singleton object, or <code>null if none found
	 * @see ConfigurableListableBeanFactory#getBeanDefinition
	 */
	Object getSingleton(String beanName);

	/**
	 * Check if this registry contains a singleton instance with the given name.
	 * <p>Only checks already instantiated singletons; does not return true
	 * for singleton bean definitions which have not been instantiated yet.
	 * <p>The main purpose of this method is to check manually registered singletons
	 * (see {@link #registerSingleton}). Can also be used to check whether a
	 * singleton defined by a bean definition has already been created.
	 * <p>To check whether a bean factory contains a bean definition with a given name,
	 * use ListableBeanFactory's <code>containsBeanDefinition. Calling both
	 * <code>containsBeanDefinition and containsSingleton answers
	 * whether a specific bean factory contains an own bean with the given name.
	 * <p>Use BeanFactory's containsBean for general checks whether the
	 * factory knows about a bean with a given name (whether manually registered singleton
	 * instance or created by bean definition), also checking ancestor factories.
	 * @param beanName the name of the bean to look for
	 * @return if this bean factory contains a singleton instance with the given name
	 * @see #registerSingleton
	 * @see org.springframework.beans.factory.ListableBeanFactory#containsBeanDefinition
	 * @see org.springframework.beans.factory.BeanFactory#containsBean
	 */
	boolean containsSingleton(String beanName);

	/**
	 * Return the names of singleton beans registered in this registry.
	 * <p>Only checks already instantiated singletons; does not return names
	 * for singleton bean definitions which have not been instantiated yet.
	 * <p>The main purpose of this method is to check manually registered singletons
	 * (see {@link #registerSingleton}). Can also be used to check which
	 * singletons defined by a bean definition have already been created.
	 * @return the list of names as String array (never <code>null)
	 * @see #registerSingleton
	 * @see org.springframework.beans.factory.support.BeanDefinitionRegistry#getBeanDefinitionNames
	 * @see org.springframework.beans.factory.ListableBeanFactory#getBeanDefinitionNames
	 */
	String[] getSingletonNames();

	/**
	 * Return the number of singleton beans registered in this registry.
	 * <p>Only checks already instantiated singletons; does not count
	 * singleton bean definitions which have not been instantiated yet.
	 * <p>The main purpose of this method is to check manually registered singletons
	 * (see {@link #registerSingleton}). Can also be used to count the number of
	 * singletons defined by a bean definition that have already been created.
	 * @return the number of singleton beans
	 * @see #registerSingleton
	 * @see org.springframework.beans.factory.support.BeanDefinitionRegistry#getBeanDefinitionCount
	 * @see org.springframework.beans.factory.ListableBeanFactory#getBeanDefinitionCount
	 */
	int getSingletonCount();

}

Other Spring Framework examples (source code examples)

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