| /* |
| * 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.File; |
| import java.io.IOException; |
| import java.util.Collection; |
| |
| import com.google.common.base.Throwables; |
| |
| import org.apache.cassandra.config.CFMetaData; |
| import org.apache.cassandra.db.*; |
| import org.apache.cassandra.db.partitions.PartitionUpdate; |
| import org.apache.cassandra.dht.IPartitioner; |
| |
| /** |
| * A SSTable writer that assumes rows are in (partitioner) sorted order. |
| * <p> |
| * Contrarily to SSTableSimpleUnsortedWriter, this writer does not buffer |
| * anything into memory, however it assumes that row are added in sorted order |
| * (an exception will be thrown otherwise), which for the RandomPartitioner |
| * means that rows should be added by increasing md5 of the row key. This is |
| * rarely possible and SSTableSimpleUnsortedWriter should most of the time be |
| * prefered. |
| */ |
| class SSTableSimpleWriter extends AbstractSSTableSimpleWriter |
| { |
| protected DecoratedKey currentKey; |
| protected PartitionUpdate update; |
| |
| private SSTableTxnWriter writer; |
| |
| protected SSTableSimpleWriter(ColumnFamilyStore cfs, IPartitioner partitioner, PartitionColumns columns) |
| { |
| super(cfs, partitioner, columns); |
| } |
| |
| private SSTableTxnWriter getOrCreateWriter() |
| { |
| if (writer == null) |
| writer = createWriter(); |
| |
| return writer; |
| } |
| |
| PartitionUpdate getUpdateFor(DecoratedKey key) throws IOException |
| { |
| assert key != null; |
| |
| // If that's not the current key, write the current one if necessary and create a new |
| // update for the new key. |
| if (!key.equals(currentKey)) |
| { |
| if (update != null) |
| writePartition(update); |
| currentKey = key; |
| update = new PartitionUpdate(cfs.metadata, currentKey, columns, 4); |
| } |
| |
| assert update != null; |
| return update; |
| } |
| |
| public void close() |
| { |
| try |
| { |
| if (update != null) |
| writePartition(update); |
| if (writer != null) |
| writer.finish(false); |
| } |
| catch (Throwable t) |
| { |
| throw Throwables.propagate(writer == null ? t : writer.abort(t)); |
| } |
| } |
| |
| private void writePartition(PartitionUpdate update) throws IOException |
| { |
| getOrCreateWriter().append(update.unfilteredIterator()); |
| } |
| } |