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Spring Framework example source code file (SimpleJndiBeanFactory.java)

This example Spring Framework source code file (SimpleJndiBeanFactory.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

beansexception, class, class, jndi, map, namenotfoundexception, naming, namingexception, namingexception, nosuchbeandefinitionexception, nosuchbeandefinitionexception, object, object, simplejndibeanfactory, string, util

The Spring Framework SimpleJndiBeanFactory.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.jndi.support;

import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import javax.naming.NameNotFoundException;
import javax.naming.NamingException;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanDefinitionStoreException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanNotOfRequiredTypeException;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.jndi.JndiLocatorSupport;
import org.springframework.jndi.TypeMismatchNamingException;

/**
 * Simple JNDI-based implementation of Spring's
 * {@link org.springframework.beans.factory.BeanFactory} interface.
 * Does not support enumerating bean definitions, hence doesn't implement
 * the {@link org.springframework.beans.factory.ListableBeanFactory} interface.
 *
 * <p>This factory resolves given bean names as JNDI names within the
 * J2EE application's "java:comp/env/" namespace. It caches the resolved
 * types for all obtained objects, and optionally also caches shareable
 * objects (if they are explicitly marked as
 * {@link #addShareableResource shareable resource}.
 *
 * <p>The main intent of this factory is usage in combination with Spring's
 * {@link org.springframework.context.annotation.CommonAnnotationBeanPostProcessor},
 * configured as "resourceFactory" for resolving <code>@Resource
 * annotations as JNDI objects without intermediate bean definitions.
 * It may be used for similar lookup scenarios as well, of course,
 * in particular if BeanFactory-style type checking is required.
 *
 * @author Juergen Hoeller
 * @since 2.5
 * @see org.springframework.beans.factory.support.DefaultListableBeanFactory
 * @see org.springframework.context.annotation.CommonAnnotationBeanPostProcessor
 */
public class SimpleJndiBeanFactory extends JndiLocatorSupport implements BeanFactory {

	/** JNDI names of resources that are known to be shareable, i.e. can be cached */
	private final Set shareableResources = new HashSet();

	/** Cache of shareable singleton objects: bean name --> bean instance */
	private final Map singletonObjects = new HashMap();

	/** Cache of the types of nonshareable resources: bean name --> bean type */
	private final Map resourceTypes = new HashMap();


	public SimpleJndiBeanFactory() {
		setResourceRef(true);
	}


	/**
	 * Set a list of names of shareable JNDI resources,
	 * which this factory is allowed to cache once obtained.
	 * @param shareableResources the JNDI names
	 * (typically within the "java:comp/env/" namespace)
	 */
	public void setShareableResources(String[] shareableResources) {
		this.shareableResources.addAll(Arrays.asList(shareableResources));
	}

	/**
	 * Add the name of a shareable JNDI resource,
	 * which this factory is allowed to cache once obtained.
	 * @param shareableResource the JNDI name
	 * (typically within the "java:comp/env/" namespace)
	 */
	public void addShareableResource(String shareableResource) {
		this.shareableResources.add(shareableResource);
	}


	public Object getBean(String name) throws BeansException {
		return getBean(name, (Class) null);
	}

	public Object getBean(String name, Class requiredType) throws BeansException {
		try {
			if (isSingleton(name)) {
				return doGetSingleton(name, requiredType);
			}
			else {
				return lookup(name, requiredType);
			}
		}
		catch (NameNotFoundException ex) {
			throw new NoSuchBeanDefinitionException(name, "not found in JNDI environment");
		}
		catch (TypeMismatchNamingException ex) {
			throw new BeanNotOfRequiredTypeException(name, ex.getRequiredType(), ex.getActualType());
		}
		catch (NamingException ex) {
			throw new BeanDefinitionStoreException("JNDI environment", name, "JNDI lookup failed", ex);
		}
	}

	public Object getBean(String name, Object[] args) throws BeansException {
		if (args != null) {
			throw new UnsupportedOperationException(
					"SimpleJndiBeanFactory does not support explicit bean creation arguments)");
		}
		return getBean(name);
	}

	public boolean containsBean(String name) {
		if (this.singletonObjects.containsKey(name) || this.resourceTypes.containsKey(name)) {
			return true;
		}
		try {
			doGetType(name);
			return true;
		}
		catch (NamingException ex) {
			return false;
		}
	}

	public boolean isSingleton(String name) throws NoSuchBeanDefinitionException {
		return this.shareableResources.contains(name);
	}

	public boolean isPrototype(String name) throws NoSuchBeanDefinitionException {
		return !this.shareableResources.contains(name);
	}

	public boolean isTypeMatch(String name, Class targetType) throws NoSuchBeanDefinitionException {
		Class type = getType(name);
		return (targetType == null || (type != null && targetType.isAssignableFrom(type)));
	}

	public Class getType(String name) throws NoSuchBeanDefinitionException {
		try {
			return doGetType(name);
		}
		catch (NameNotFoundException ex) {
			throw new NoSuchBeanDefinitionException(name, "not found in JNDI environment");
		}
		catch (NamingException ex) {
			return null;
		}
	}

	public String[] getAliases(String name) {
		return new String[0];
	}


	private Object doGetSingleton(String name, Class requiredType) throws NamingException {
		synchronized (this.singletonObjects) {
			if (this.singletonObjects.containsKey(name)) {
				Object jndiObject = this.singletonObjects.get(name);
				if (requiredType != null && !requiredType.isInstance(jndiObject)) {
					throw new TypeMismatchNamingException(
							convertJndiName(name), requiredType, (jndiObject != null ? jndiObject.getClass() : null));
				}
				return jndiObject;
			}
			Object jndiObject = lookup(name, requiredType);
			this.singletonObjects.put(name, jndiObject);
			return jndiObject;
		}
	}

	private Class doGetType(String name) throws NamingException {
		if (isSingleton(name)) {
			Object jndiObject = doGetSingleton(name, null);
			return (jndiObject != null ? jndiObject.getClass() : null);
		}
		else {
			synchronized (this.resourceTypes) {
				if (this.resourceTypes.containsKey(name)) {
					return (Class) this.resourceTypes.get(name);
				}
				else {
					Object jndiObject = lookup(name, null);
					Class type = (jndiObject != null ? jndiObject.getClass() : null);
					this.resourceTypes.put(name, type);
					return type;
				}
			}
		}
	}

}

Other Spring Framework examples (source code examples)

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