/* * 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.FileDataInput; import org.apache.cassandra.io.util.DataPosition; 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<Unfiltered> implements Iterator<Unfiltered> { 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 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 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() { 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()) return computeNext(); } return unfiltered; } catch (IOException e) { throw new IOError(e); } } } }