package org.apache.cassandra.db;
/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*
*/
import java.io.DataOutput;
import java.io.IOException;
import java.security.MessageDigest;
import org.apache.cassandra.db.compaction.AbstractCompactedRow;
import org.apache.cassandra.db.compaction.CompactionController;
import org.apache.cassandra.io.sstable.SSTableIdentityIterator;
/**
* A CompactedRow implementation that just echos the original row bytes without deserializing.
* Currently only used by cleanup.
*/
public class EchoedRow extends AbstractCompactedRow
{
private final SSTableIdentityIterator row;
private final int gcBefore;
public EchoedRow(CompactionController controller, SSTableIdentityIterator row)
{
super(row.getKey());
this.row = row;
this.gcBefore = controller.gcBefore;
// Reset SSTableIdentityIterator because we have not guarantee the filePointer hasn't moved since the Iterator was built
row.reset();
}
public void write(DataOutput out) throws IOException
{
assert row.dataSize > 0;
out.writeLong(row.dataSize);
row.echoData(out);
}
public void update(MessageDigest digest)
{
// EchoedRow is not used in anti-entropy validation
throw new UnsupportedOperationException();
}
public boolean isEmpty()
{
return !row.hasNext() && ColumnFamilyStore.removeDeletedCF(row.getColumnFamily(), gcBefore) == null;
}
public int columnCount()
{
return row.columnCount;
}
}