| /* |
| * 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.db.compaction; |
| |
| import java.util.ArrayList; |
| import java.util.Comparator; |
| import java.util.List; |
| import java.util.UUID; |
| |
| import com.google.common.collect.ImmutableList; |
| |
| import org.apache.cassandra.db.columniterator.OnDiskAtomIterator; |
| import org.apache.cassandra.io.sstable.format.SSTableFormat; |
| import org.apache.cassandra.io.sstable.ISSTableScanner; |
| import org.apache.cassandra.utils.CloseableIterator; |
| import org.apache.cassandra.utils.MergeIterator; |
| |
| public class CompactionIterable extends AbstractCompactionIterable |
| { |
| final SSTableFormat format; |
| |
| private static final Comparator<OnDiskAtomIterator> comparator = new Comparator<OnDiskAtomIterator>() |
| { |
| public int compare(OnDiskAtomIterator i1, OnDiskAtomIterator i2) |
| { |
| return i1.getKey().compareTo(i2.getKey()); |
| } |
| }; |
| |
| public CompactionIterable(OperationType type, |
| List<ISSTableScanner> scanners, |
| CompactionController controller, |
| SSTableFormat.Type formatType, |
| UUID compactionId) |
| { |
| super(controller, type, scanners, compactionId); |
| this.format = formatType.info; |
| } |
| |
| public CloseableIterator<AbstractCompactedRow> iterator() |
| { |
| return MergeIterator.get(scanners, comparator, new Reducer()); |
| } |
| |
| public String toString() |
| { |
| return this.getCompactionInfo().toString(); |
| } |
| |
| protected class Reducer extends MergeIterator.Reducer<OnDiskAtomIterator, AbstractCompactedRow> |
| { |
| protected final List<OnDiskAtomIterator> rows = new ArrayList<>(); |
| |
| public void reduce(OnDiskAtomIterator current) |
| { |
| rows.add(current); |
| } |
| |
| protected AbstractCompactedRow getReduced() |
| { |
| assert !rows.isEmpty(); |
| |
| CompactionIterable.this.updateCounterFor(rows.size()); |
| try |
| { |
| // create a new container for rows, since we're going to clear ours for the next one, |
| // and the AbstractCompactionRow code should be able to assume that the collection it receives |
| // won't be pulled out from under it. |
| return format.getCompactedRowWriter(controller, ImmutableList.copyOf(rows)); |
| } |
| finally |
| { |
| rows.clear(); |
| long n = 0; |
| for (ISSTableScanner scanner : scanners) |
| n += scanner.getCurrentPosition(); |
| bytesRead = n; |
| } |
| } |
| } |
| } |