com.smoketurner.notification.application.riak.CursorResolver Maven / Gradle / Ivy
/**
* Copyright 2015 Smoke Turner, LLC.
*
* 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.smoketurner.notification.application.riak;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.basho.riak.client.api.cap.ConflictResolver;
import com.basho.riak.client.api.cap.UnresolvedConflictException;
import com.google.common.collect.ImmutableSortedSet;
public class CursorResolver implements ConflictResolver {
private static final Logger LOGGER = LoggerFactory.getLogger(CursorResolver.class);
@Override
public CursorObject resolve(final List siblings) throws UnresolvedConflictException {
LOGGER.debug("Found {} siblings", siblings.size());
if (siblings.size() > 1) {
final ImmutableSortedSet cursors = ImmutableSortedSet.copyOf(siblings);
return cursors.first();
} else if (siblings.size() == 1) {
return siblings.iterator().next();
} else {
return null;
}
}
}