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/**
* Copyright 2003-2010 Terracotta, Inc.
*
* 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 net.sf.ehcache.constructs.blocking;
import net.sf.ehcache.Element;
import java.util.Random;
/**
* A cache entry factory that counts the number of entries it has created.
* <p/>
* This is useful for writing tests.
*
* @author Greg Luck
* @version $Id: CountingCacheEntryFactory.java 2154 2010-04-06 02:45:52Z cdennis $
*/
public class CountingCacheEntryFactory implements UpdatingCacheEntryFactory {
private int count;
private final Object value;
private Random random;
/**
* Creates a new instance
*
* @param value the factory always creates values equal to this value
*/
public CountingCacheEntryFactory(final Object value) {
this.value = value;
random = new Random();
}
/**
* Fetches an entry.
*/
public Object createEntry(final Object key) {
count++;
if (random.nextInt(2) == 1) {
return value;
} else {
return new Element(key, value);
}
}
/**
* @return number of entries the factory has created.
*/
public int getCount() {
return count;
}
/**
* Perform an incremental update of data within a CacheEntry.
* Based on identification of dirty values within a CacheEntry
* Insert Update or Delete those entries based on the existing value.
* <p/>
* This method does not return a modified value, because it modifies the value passed into it, relying
* on the pass by reference feature of Java.
* <p/>
* Implementations of this method must be thread safe.
*
* @param key the cache Key
* @param value a value copied from the value that belonged to the Element in the cache. Value must be mutable
* @throws Exception
*/
public void updateEntryValue(Object key, Object value) throws Exception {
count++;
if (key.equals("explode") && count > 1) {
throw new RuntimeException("EXPLODE!");
}
}
}
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