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/*
* 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.
*/
package org.apache.cassandra.io.sstable;
import java.io.IOException;
import java.io.IOError;
import java.util.Iterator;
import org.apache.cassandra.io.util.RewindableDataInput;
import org.apache.cassandra.utils.AbstractIterator;
import org.apache.cassandra.config.CFMetaData;
import org.apache.cassandra.config.ColumnDefinition;
import org.apache.cassandra.db.*;
import org.apache.cassandra.db.rows.*;
import org.apache.cassandra.io.util.DataInputPlus;
import org.apache.cassandra.io.util.DataPosition;
import org.apache.cassandra.io.util.FileDataInput;
import org.apache.cassandra.net.MessagingService;
/**
* Utility class to handle deserializing atom from sstables.
*
* Note that this is not a full fledged UnfilteredRowIterator. It's also not closeable, it is always
* the job of the user to close the underlying ressources.
*/
public abstract class SSTableSimpleIterator extends AbstractIterator implements Iterator
{
protected final CFMetaData metadata;
protected final DataInputPlus in;
protected final SerializationHelper helper;
private SSTableSimpleIterator(CFMetaData metadata, DataInputPlus in, SerializationHelper helper)
{
this.metadata = metadata;
this.in = in;
this.helper = helper;
}
public static SSTableSimpleIterator create(CFMetaData metadata, DataInputPlus in, SerializationHeader header, SerializationHelper helper, DeletionTime partitionDeletion)
{
if (helper.version < MessagingService.VERSION_30)
return new OldFormatIterator(metadata, in, helper, partitionDeletion);
else
return new CurrentFormatIterator(metadata, in, header, helper);
}
public static SSTableSimpleIterator createTombstoneOnly(CFMetaData metadata, DataInputPlus in, SerializationHeader header, SerializationHelper helper, DeletionTime partitionDeletion)
{
if (helper.version < MessagingService.VERSION_30)
return new OldFormatTombstoneIterator(metadata, in, helper, partitionDeletion);
else
return new CurrentFormatTombstoneIterator(metadata, in, header, helper);
}
public abstract Row readStaticRow() throws IOException;
private static class CurrentFormatIterator extends SSTableSimpleIterator
{
private final SerializationHeader header;
private final Row.Builder builder;
private CurrentFormatIterator(CFMetaData metadata, DataInputPlus in, SerializationHeader header, SerializationHelper helper)
{
super(metadata, in, helper);
this.header = header;
this.builder = BTreeRow.sortedBuilder();
}
public Row readStaticRow() throws IOException
{
return header.hasStatic() ? UnfilteredSerializer.serializer.deserializeStaticRow(in, header, helper) : Rows.EMPTY_STATIC_ROW;
}
protected Unfiltered computeNext()
{
try
{
Unfiltered unfiltered = UnfilteredSerializer.serializer.deserialize(in, header, helper, builder);
return unfiltered == null ? endOfData() : unfiltered;
}
catch (IOException e)
{
throw new IOError(e);
}
}
}
private static class CurrentFormatTombstoneIterator extends SSTableSimpleIterator
{
private final SerializationHeader header;
private CurrentFormatTombstoneIterator(CFMetaData metadata, DataInputPlus in, SerializationHeader header, SerializationHelper helper)
{
super(metadata, in, helper);
this.header = header;
}
public Row readStaticRow() throws IOException
{
if (header.hasStatic())
{
Row staticRow = UnfilteredSerializer.serializer.deserializeStaticRow(in, header, helper);
if (!staticRow.deletion().isLive())
return BTreeRow.emptyDeletedRow(staticRow.clustering(), staticRow.deletion());
}
return Rows.EMPTY_STATIC_ROW;
}
protected Unfiltered computeNext()
{
try
{
Unfiltered unfiltered = UnfilteredSerializer.serializer.deserializeTombstonesOnly((FileDataInput) in, header, helper);
return unfiltered == null ? endOfData() : unfiltered;
}
catch (IOException e)
{
throw new IOError(e);
}
}
}
private static class OldFormatIterator extends SSTableSimpleIterator
{
private final UnfilteredDeserializer deserializer;
private OldFormatIterator(CFMetaData metadata, DataInputPlus in, SerializationHelper helper, DeletionTime partitionDeletion)
{
super(metadata, in, helper);
// We use an UnfilteredDeserializer because even though we don't need all it's fanciness, it happens to handle all
// the details we need for reading the old format.
this.deserializer = UnfilteredDeserializer.create(metadata, in, null, helper, partitionDeletion, false);
}
public Row readStaticRow() throws IOException
{
if (metadata.isCompactTable())
{
// For static compact tables, in the old format, static columns are intermingled with the other columns, so we
// need to extract them. Which imply 2 passes (one to extract the static, then one for other value).
if (metadata.isStaticCompactTable())
{
assert in instanceof RewindableDataInput;
RewindableDataInput file = (RewindableDataInput)in;
DataPosition mark = file.mark();
Row staticRow = LegacyLayout.extractStaticColumns(metadata, file, metadata.partitionColumns().statics);
file.reset(mark);
// We've extracted the static columns, so we must ignore them on the 2nd pass
((UnfilteredDeserializer.OldFormatDeserializer)deserializer).setSkipStatic();
return staticRow;
}
else
{
return Rows.EMPTY_STATIC_ROW;
}
}
return deserializer.hasNext() && deserializer.nextIsStatic()
? (Row)deserializer.readNext()
: Rows.EMPTY_STATIC_ROW;
}
protected Unfiltered computeNext()
{
while (true)
{
try
{
if (!deserializer.hasNext())
return endOfData();
Unfiltered unfiltered = deserializer.readNext();
if (metadata.isStaticCompactTable() && unfiltered.kind() == Unfiltered.Kind.ROW)
{
Row row = (Row) unfiltered;
ColumnDefinition def = metadata.getColumnDefinition(LegacyLayout.encodeClustering(metadata, row.clustering()));
if (def != null && def.isStatic())
continue;
}
return unfiltered;
}
catch (IOException e)
{
throw new IOError(e);
}
}
}
}
private static class OldFormatTombstoneIterator extends OldFormatIterator
{
private OldFormatTombstoneIterator(CFMetaData metadata, DataInputPlus in, SerializationHelper helper, DeletionTime partitionDeletion)
{
super(metadata, in, helper, partitionDeletion);
}
public Row readStaticRow() throws IOException
{
Row row = super.readStaticRow();
if (!row.deletion().isLive())
return BTreeRow.emptyDeletedRow(row.clustering(), row.deletion());
return Rows.EMPTY_STATIC_ROW;
}
protected Unfiltered computeNext()
{
while (true)
{
Unfiltered unfiltered = super.computeNext();
if (unfiltered == null || unfiltered.isRangeTombstoneMarker())
return unfiltered;
Row row = (Row) unfiltered;
if (!row.deletion().isLive())
return BTreeRow.emptyDeletedRow(row.clustering(), row.deletion());
// Otherwise read next.
}
}
}
}
