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Spring Framework example source code file (CachingMetadataReaderFactory.java)

This example Spring Framework source code file (CachingMetadataReaderFactory.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

cachingmetadatareaderfactory, cachingmetadatareaderfactory, hashmap, io, ioexception, map, map, metadatareader, metadatareader, simplemetadatareaderfactory, simplemetadatareaderfactory, util

The Spring Framework CachingMetadataReaderFactory.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.core.type.classreading;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;

/**
 * Caching implementation of the {@link MetadataReaderFactory} interface,
 * caching an ASM {@link org.objectweb.asm.ClassReader} per Spring Resource handle
 * (i.e. per ".class" file).
 *
 * @author Juergen Hoeller
 * @since 2.5
 */
public class CachingMetadataReaderFactory extends SimpleMetadataReaderFactory {

	private final Map<Resource, MetadataReader> classReaderCache = new HashMap();


	/**
	 * Create a new CachingMetadataReaderFactory for the default class loader.
	 */
	public CachingMetadataReaderFactory() {
		super();
	}

	/**
	 * Create a new CachingMetadataReaderFactory for the given resource loader.
	 * @param resourceLoader the Spring ResourceLoader to use
	 * (also determines the ClassLoader to use)
	 */
	public CachingMetadataReaderFactory(ResourceLoader resourceLoader) {
		super(resourceLoader);
	}

	/**
	 * Create a new CachingMetadataReaderFactory for the given class loader.
	 * @param classLoader the ClassLoader to use
	 */
	public CachingMetadataReaderFactory(ClassLoader classLoader) {
		super(classLoader);
	}


	public MetadataReader getMetadataReader(Resource resource) throws IOException {
		synchronized (this.classReaderCache) {
			MetadataReader metadataReader = this.classReaderCache.get(resource);
			if (metadataReader == null) {
				metadataReader = super.getMetadataReader(resource);
				this.classReaderCache.put(resource, metadataReader);
			}
			return metadataReader;
		}
	}

}

Other Spring Framework examples (source code examples)

Here is a short list of links related to this Spring Framework CachingMetadataReaderFactory.java source code file:

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