maedhroz commented on code in PR #2267: URL: https://github.com/apache/cassandra/pull/2267#discussion_r1167166246
########## src/java/org/apache/cassandra/io/sstable/format/bti/BtiTableScanner.java: ########## @@ -0,0 +1,348 @@ +/* + * 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.format.bti; + +import java.io.IOException; +import java.util.ArrayList; +import java.util.Collection; +import java.util.Iterator; +import java.util.List; +import java.util.Set; +import java.util.concurrent.atomic.AtomicBoolean; + +import com.google.common.collect.ImmutableSet; +import com.google.common.collect.Iterators; + +import org.apache.cassandra.db.DataRange; +import org.apache.cassandra.db.DecoratedKey; +import org.apache.cassandra.db.PartitionPosition; +import org.apache.cassandra.db.filter.ClusteringIndexFilter; +import org.apache.cassandra.db.filter.ColumnFilter; +import org.apache.cassandra.db.rows.LazilyInitializedUnfilteredRowIterator; +import org.apache.cassandra.db.rows.UnfilteredRowIterator; +import org.apache.cassandra.dht.AbstractBounds; +import org.apache.cassandra.dht.AbstractBounds.Boundary; +import org.apache.cassandra.dht.Bounds; +import org.apache.cassandra.dht.Range; +import org.apache.cassandra.dht.Token; +import org.apache.cassandra.io.sstable.CorruptSSTableException; +import org.apache.cassandra.io.sstable.ISSTableScanner; +import org.apache.cassandra.io.sstable.SSTableReadsListener; +import org.apache.cassandra.io.sstable.format.SSTableReader; +import org.apache.cassandra.io.util.FileUtils; +import org.apache.cassandra.io.util.RandomAccessReader; +import org.apache.cassandra.schema.TableMetadata; +import org.apache.cassandra.utils.AbstractIterator; +import org.apache.cassandra.utils.CloseableIterator; + +import static org.apache.cassandra.dht.AbstractBounds.isEmpty; +import static org.apache.cassandra.dht.AbstractBounds.maxLeft; +import static org.apache.cassandra.dht.AbstractBounds.minRight; + +public class BtiTableScanner implements ISSTableScanner +{ + private final AtomicBoolean isClosed = new AtomicBoolean(false); + protected final RandomAccessReader dfile; + public final BtiTableReader sstable; + + private final Iterator<AbstractBounds<PartitionPosition>> rangeIterator; + + private final ColumnFilter columns; + private final DataRange dataRange; + private final SSTableReadsListener listener; + private long startScan = -1; + private long bytesScanned = 0; + + protected CloseableIterator<UnfilteredRowIterator> iterator; + + // Full scan of the sstables + public static ISSTableScanner getScanner(BtiTableReader sstable) + { + return getScanner(sstable, Iterators.singletonIterator(fullRange(sstable))); + } + + public static ISSTableScanner getScanner(BtiTableReader sstable, + ColumnFilter columns, + DataRange dataRange, + SSTableReadsListener listener) + { + return new BtiTableScanner(sstable, columns, dataRange, makeBounds(sstable, dataRange).iterator(), listener); + } + + public static ISSTableScanner getScanner(BtiTableReader sstable, Collection<Range<Token>> tokenRanges) + { + return getScanner(sstable, makeBounds(sstable, tokenRanges).iterator()); + } + + public static ISSTableScanner getScanner(BtiTableReader sstable, Iterator<AbstractBounds<PartitionPosition>> rangeIterator) + { + return new BtiTableScanner(sstable, ColumnFilter.all(sstable.metadata()), null, rangeIterator, SSTableReadsListener.NOOP_LISTENER); + } + + private BtiTableScanner(BtiTableReader sstable, + ColumnFilter columns, + DataRange dataRange, + Iterator<AbstractBounds<PartitionPosition>> rangeIterator, + SSTableReadsListener listener) + { + assert sstable != null; + + this.dfile = sstable.openDataReader(); + this.sstable = sstable; + this.columns = columns; + this.dataRange = dataRange; + this.rangeIterator = rangeIterator; + this.listener = listener; + } + + public static List<AbstractBounds<PartitionPosition>> makeBounds(SSTableReader sstable, Collection<Range<Token>> tokenRanges) + { + List<AbstractBounds<PartitionPosition>> boundsList = new ArrayList<>(tokenRanges.size()); + for (Range<Token> range : Range.normalize(tokenRanges)) + addRange(sstable, Range.makeRowRange(range), boundsList); + return boundsList; + } + + static List<AbstractBounds<PartitionPosition>> makeBounds(SSTableReader sstable, DataRange dataRange) + { + List<AbstractBounds<PartitionPosition>> boundsList = new ArrayList<>(2); + addRange(sstable, dataRange.keyRange(), boundsList); + return boundsList; + } + + static AbstractBounds<PartitionPosition> fullRange(SSTableReader sstable) + { + return new Bounds<>(sstable.first, sstable.last); + } + + private static void addRange(SSTableReader sstable, AbstractBounds<PartitionPosition> requested, List<AbstractBounds<PartitionPosition>> boundsList) + { + if (requested instanceof Range && ((Range<?>) requested).isWrapAround()) + { + if (requested.right.compareTo(sstable.first) >= 0) + { + // since we wrap, we must contain the whole sstable prior to stopKey() + Boundary<PartitionPosition> left = new Boundary<>(sstable.first, true); + Boundary<PartitionPosition> right; + right = requested.rightBoundary(); + right = minRight(right, sstable.last, true); + if (!isEmpty(left, right)) + boundsList.add(AbstractBounds.bounds(left, right)); + } + if (requested.left.compareTo(sstable.last) <= 0) + { + // since we wrap, we must contain the whole sstable after dataRange.startKey() + Boundary<PartitionPosition> right = new Boundary<>(sstable.last, true); + Boundary<PartitionPosition> left; + left = requested.leftBoundary(); + left = maxLeft(left, sstable.first, true); + if (!isEmpty(left, right)) + boundsList.add(AbstractBounds.bounds(left, right)); + } + } + else + { + assert !AbstractBounds.strictlyWrapsAround(requested.left, requested.right); + Boundary<PartitionPosition> left, right; + left = requested.leftBoundary(); + right = requested.rightBoundary(); + left = maxLeft(left, sstable.first, true); + // apparently isWrapAround() doesn't count Bounds that extend to the limit (min) as wrapping + right = requested.right.isMinimum() ? new Boundary<>(sstable.last, true) + : minRight(right, sstable.last, true); + if (!isEmpty(left, right)) + boundsList.add(AbstractBounds.bounds(left, right)); + } + } + + public void close() + { + try + { + if (isClosed.compareAndSet(false, true)) + { + FileUtils.close(dfile); + if (iterator != null) + iterator.close(); + } + } + catch (IOException e) + { + sstable.markSuspect(); + throw new CorruptSSTableException(e, sstable.getFilename()); + } + } + + public long getBytesScanned() + { + return bytesScanned; + } + + @Override + public long getLengthInBytes() + { + return sstable.uncompressedLength(); + } + + + public long getCompressedLengthInBytes() + { + return sstable.onDiskLength(); + } + + @Override + public long getCurrentPosition() + { + return dfile.getFilePointer(); + } + + @Override + public Set<SSTableReader> getBackingSSTables() + { + return ImmutableSet.of(sstable); + } + + public int level() Review Comment: nit: unused method -- This is an automated message from the Apache Git Service. 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