/* This file is part of VoltDB.
* Copyright (C) 2008-2014 VoltDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with VoltDB. If not, see <http://www.gnu.org/licenses/>.
*/
package org.voltdb;
import java.util.concurrent.Callable;
import org.voltcore.utils.DBBPool.BBContainer;
/*
* Filter that projects out data from all partitions except for the ones specified
*/
public class PartitionProjectionSnapshotFilter implements SnapshotDataFilter {
private final int m_partitions[];
private final int m_partitionIdOffset;
public PartitionProjectionSnapshotFilter(int partitions[], int partitionIdOffset) {
m_partitions = partitions;
m_partitionIdOffset = partitionIdOffset;
}
@Override
public Callable<BBContainer> filter(final Callable<BBContainer> input) {
return new Callable<BBContainer>() {
@Override
public BBContainer call() throws Exception {
final BBContainer cont = input.call();
final int partitionId = cont.b().getInt(m_partitionIdOffset);
boolean hasPartition = false;
for (int acceptedPartitionId : m_partitions) {
if (partitionId == acceptedPartitionId) {
hasPartition = true;
}
}
if (hasPartition) {
return cont;
} else {
cont.discard();
return null;
}
}
};
}
}