com.googlecode.ehcache.annotations.RefreshingCacheEntryFactory Maven / Gradle / Ivy

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Provides a simple model for integrating Ehcache in a Spring project via annotations.

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/**
 * Copyright 2010-2011 Nicholas Blair, Eric Dalquist
 *
 * 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 com.googlecode.ehcache.annotations;

import net.sf.ehcache.constructs.blocking.UpdatingCacheEntryFactory;

import org.aopalliance.intercept.MethodInvocation;

import com.googlecode.ehcache.annotations.resolver.ThreadLocalCacheEntryFactory;

/**
 * Entry factory used by {@link RefreshableCacheEntry} that can update {@link RefreshableCacheEntry}
 * 
 * @author Eric Dalquist
 * @version $Revision: 679 $
 */
public class RefreshingCacheEntryFactory extends ThreadLocalCacheEntryFactory implements UpdatingCacheEntryFactory {

    public void updateEntryValue(Object key, Object value) throws Exception {
        if (!(value instanceof RefreshableCacheEntry)) {
            throw new IllegalArgumentException(this.getClass().getSimpleName() + " requires cache entries of type " + RefreshableCacheEntry.class.getSimpleName());
        }
        
        final RefreshableCacheEntry refreshableCacheEntry = (RefreshableCacheEntry)value;
        
        final MethodInvocation methodInvocation = refreshableCacheEntry.getMethodInvocation();
        final MethodInvocation existingMethodInvocation = entryFactory.get();
        try {
            entryFactory.set(methodInvocation);
            
            final RefreshableCacheEntry newEntry = (RefreshableCacheEntry) this.createEntry(key);
            refreshableCacheEntry.setValue(newEntry.getValue());
        }
        finally {
            if (existingMethodInvocation == null) {
                entryFactory.remove();
            }
            else {
                entryFactory.set(existingMethodInvocation);
            }
        }
    }

    @Override
    public Object createEntry(Object key) throws Exception {
        final MethodInvocation methodInvocation = this.entryFactory.get();
        final Object value = super.createEntry(key);
        return new RefreshableCacheEntry(methodInvocation, value);
    }
}