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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
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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.format;

import java.io.IOException;

import org.apache.cassandra.db.ClusteringPrefix;
import org.apache.cassandra.db.DecoratedKey;
import org.apache.cassandra.db.DeletionTime;
import org.apache.cassandra.db.SerializationHeader;
import org.apache.cassandra.db.rows.RangeTombstoneMarker;
import org.apache.cassandra.db.rows.Row;
import org.apache.cassandra.db.rows.SerializationHelper;
import org.apache.cassandra.db.rows.Unfiltered;
import org.apache.cassandra.db.rows.UnfilteredSerializer;
import org.apache.cassandra.io.util.SequentialWriter;
import org.apache.cassandra.utils.ByteBufferUtil;

import static com.google.common.base.Preconditions.checkState;

public abstract class SortedTablePartitionWriter implements AutoCloseable
{
    protected final UnfilteredSerializer unfilteredSerializer;

    private final SerializationHeader header;
    private final SequentialWriter writer;
    private final SerializationHelper helper;
    private final Version version;

    private long previousRowStart;
    private long initialPosition;
    private long headerLength;

    protected long startPosition;
    protected int written;

    protected ClusteringPrefix firstClustering;
    protected ClusteringPrefix lastClustering;

    protected DeletionTime openMarker = DeletionTime.LIVE;
    protected DeletionTime startOpenMarker = DeletionTime.LIVE;

    // Sequence control, also used to add empty static row if `addStaticRow` is not called.
    private enum State
    {
        AWAITING_PARTITION_HEADER,
        AWAITING_STATIC_ROW,
        AWAITING_ROWS,
        COMPLETED
    }

    State state = State.AWAITING_PARTITION_HEADER;

    protected SortedTablePartitionWriter(SerializationHeader header, SequentialWriter writer, Version version)
    {
        this.header = header;
        this.writer = writer;
        this.unfilteredSerializer = UnfilteredSerializer.serializer;
        this.helper = new SerializationHelper(header);
        this.version = version;
    }

    protected void reset()
    {
        this.initialPosition = writer.position();
        this.startPosition = -1;
        this.previousRowStart = 0;
        this.written = 0;
        this.firstClustering = null;
        this.lastClustering = null;
        this.openMarker = DeletionTime.LIVE;
        this.headerLength = -1;
        this.state = State.AWAITING_PARTITION_HEADER;
    }

    public long getHeaderLength()
    {
        return headerLength;
    }

    public void start(DecoratedKey key, DeletionTime partitionLevelDeletion) throws IOException
    {
        if (state == State.COMPLETED)
            reset();

        checkState(state == State.AWAITING_PARTITION_HEADER);

        ByteBufferUtil.writeWithShortLength(key.getKey(), writer);
        DeletionTime.getSerializer(version).serialize(partitionLevelDeletion, writer);

        if (!header.hasStatic())
        {
            this.headerLength = writer.position() - initialPosition;
            state = State.AWAITING_ROWS;
            return;
        }

        state = State.AWAITING_STATIC_ROW;
    }

    public void addStaticRow(Row staticRow) throws IOException
    {
        checkState(state == State.AWAITING_STATIC_ROW);
        checkState(staticRow.isStatic());

        UnfilteredSerializer.serializer.serializeStaticRow(staticRow, helper, writer, version.correspondingMessagingVersion());

        this.headerLength = writer.position() - initialPosition;
        state = State.AWAITING_ROWS;
    }

    public void addUnfiltered(Unfiltered unfiltered) throws IOException
    {
        checkState(state == State.AWAITING_ROWS);

        long pos = currentPosition();

        if (firstClustering == null)
        {
            // Beginning of an index block. Remember the start and position
            firstClustering = unfiltered.clustering();
            startOpenMarker = openMarker;
            startPosition = pos;
        }

        long unfilteredPosition = writer.position();
        unfilteredSerializer.serialize(unfiltered, helper, writer, pos - previousRowStart, version.correspondingMessagingVersion());

        lastClustering = unfiltered.clustering();
        previousRowStart = pos;
        ++written;

        if (unfiltered.kind() == Unfiltered.Kind.RANGE_TOMBSTONE_MARKER)
        {
            RangeTombstoneMarker marker = (RangeTombstoneMarker) unfiltered;
            openMarker = marker.isOpen(false) ? marker.openDeletionTime(false) : DeletionTime.LIVE;
        }
    }

    protected long finish() throws IOException
    {
        checkState(state == State.AWAITING_ROWS);

        state = State.COMPLETED;

        long endPosition = currentPosition();
        unfilteredSerializer.writeEndOfPartition(writer);

        return endPosition;
    }

    protected long currentPosition()
    {
        return writer.position() - initialPosition;
    }

    public long getInitialPosition()
    {
        return initialPosition;
    }
}