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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.File;
import java.io.IOException;

import com.google.common.base.Throwables;

import org.apache.cassandra.config.CFMetaData;
import org.apache.cassandra.db.*;
import org.apache.cassandra.db.partitions.PartitionUpdate;

/**
 * A SSTable writer that assumes rows are in (partitioner) sorted order.
 * 

* 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(File directory, CFMetaData metadata, PartitionColumns columns) { super(directory, metadata, 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(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()); } }





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