/**
* 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.writer.writebehind.operations;
import net.sf.ehcache.CacheEntry;
import net.sf.ehcache.Element;
import net.sf.ehcache.writer.CacheWriter;
import java.util.ArrayList;
import java.util.List;
/**
* Implements the delete operation for write behind
*
* @author Geert Bevin
* @version $Id: DeleteOperation.java 2154 2010-04-06 02:45:52Z cdennis $
*/
public class DeleteOperation implements SingleOperation {
private final CacheEntry entry;
private final long creationTime;
/**
* Create a new delete operation for a particular entry
*
* @param entry the entry to delete
*/
public DeleteOperation(CacheEntry entry) {
this(entry, System.currentTimeMillis());
}
/**
* Create a new delete operation for a particular entry and creation time
*
* @param entry the entry to delete
* @param creationTime the creation time of the operation
*/
public DeleteOperation(CacheEntry entry, long creationTime) {
this.entry = duplicateCacheEntryElement(entry);
this.creationTime = creationTime;
}
private CacheEntry duplicateCacheEntryElement(CacheEntry entry) {
if (null == entry.getElement()) {
return entry;
} else {
Element element = entry.getElement();
return new CacheEntry(entry.getKey(), new Element(element.getObjectKey(), element.getObjectValue(), element.getVersion(),
element.getCreationTime(), element.getLastAccessTime(), element.getHitCount(), false,
element.getTimeToLive(), element.getTimeToIdle(), element.getLastUpdateTime()));
}
}
/**
* {@inheritDoc}
*/
public void performSingleOperation(CacheWriter cacheWriter) {
cacheWriter.delete(entry);
}
/**
* {@inheritDoc}
*/
public BatchOperation createBatchOperation(List<SingleOperation> operations) {
final List<CacheEntry> entries = new ArrayList<CacheEntry>();
for (KeyBasedOperation operation : operations) {
entries.add(((DeleteOperation) operation).entry);
}
return new DeleteAllOperation(entries);
}
/**
* {@inheritDoc}
*/
public Object getKey() {
return entry.getKey();
}
/**
* {@inheritDoc}
*/
public long getCreationTime() {
return creationTime;
}
/**
* Retrieves the entry that will be used for this operation
*/
public CacheEntry getEntry() {
return entry;
}
/**
* {@inheritDoc}
*/
public SingleOperationType getType() {
return SingleOperationType.DELETE;
}
}