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* JBoss, Home of Professional Open Source
* Copyright 2009 Red Hat Inc. and/or its affiliates and other
* contributors as indicated by the @author tags. All rights reserved.
* See the copyright.txt in the distribution for a full listing of
* individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.infinispan.atomic;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.Map;
import java.util.Set;
import org.infinispan.marshall.AbstractExternalizer;
import org.infinispan.marshall.Ids;
import org.infinispan.util.Util;
/**
* An atomic remove operation.
* <p/>
*
* @author (various)
* @param <K>
* @param <V>
* @since 4.0
*/
public class RemoveOperation<K, V> extends Operation<K, V> {
private K key;
private V oldValue;
public RemoveOperation() {
}
RemoveOperation(K key, V oldValue) {
this.key = key;
this.oldValue = oldValue;
}
@Override
public void rollback(Map<K, V> delegate) {
if (oldValue != null) delegate.put(key, oldValue);
}
@Override
public void replay(Map<K, V> delegate) {
delegate.remove(key);
}
@Override
public K keyAffected() {
return key;
}
public static class Externalizer extends AbstractExternalizer<RemoveOperation> {
@Override
public void writeObject(ObjectOutput output, RemoveOperation remove) throws IOException {
output.writeObject(remove.key);
}
@Override
public RemoveOperation readObject(ObjectInput input) throws IOException, ClassNotFoundException {
RemoveOperation<Object, Object> remove = new RemoveOperation<Object, Object>();
remove.key = input.readObject();
return remove;
}
@Override
public Integer getId() {
return Ids.ATOMIC_REMOVE_OPERATION;
}
@Override
public Set<Class<? extends RemoveOperation>> getTypeClasses() {
return Util.<Class<? extends RemoveOperation>>asSet(RemoveOperation.class);
}
}
}