cassandra-trunk/src/java/org/apache/cassandra/io/sstable/format/SortedTableReaderLoadingBuilder.java
/*
 * 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 org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.apache.cassandra.io.sstable.SSTable;
import org.apache.cassandra.io.sstable.format.bti.BtiFormat;
import org.apache.cassandra.io.sstable.metadata.StatsMetadata;
import org.apache.cassandra.io.sstable.metadata.ValidationMetadata;
import org.apache.cassandra.io.util.FileHandle;
import org.apache.cassandra.utils.FBUtilities;
import org.apache.cassandra.utils.IFilter;

public abstract class SortedTableReaderLoadingBuilder<R extends SSTableReader, B extends SSTableReader.Builder<R, B>>
extends SSTableReaderLoadingBuilder<R, B>
{
    private final static Logger logger = LoggerFactory.getLogger(SortedTableReaderLoadingBuilder.class);
    private FileHandle.Builder dataFileBuilder;

    public SortedTableReaderLoadingBuilder(SSTable.Builder<?, ?> builder)
    {
        super(builder);
    }

    protected IFilter loadFilter(ValidationMetadata validationMetadata)
    {
        return FilterComponent.maybeLoadBloomFilter(descriptor,
                                                    components,
                                                    tableMetadataRef.get(),
                                                    validationMetadata);
    }

    protected FileHandle.Builder dataFileBuilder(StatsMetadata statsMetadata)
    {
        assert this.dataFileBuilder == null || this.dataFileBuilder.file.equals(descriptor.fileFor(BtiFormat.Components.DATA));

        logger.info("Opening {} ({})", descriptor, FBUtilities.prettyPrintMemory(descriptor.fileFor(BtiFormat.Components.DATA).length()));

        long recordSize = statsMetadata.estimatedPartitionSize.percentile(ioOptions.diskOptimizationEstimatePercentile);
        int bufferSize = ioOptions.diskOptimizationStrategy.bufferSize(recordSize);

        if (dataFileBuilder == null)
            dataFileBuilder = new FileHandle.Builder(descriptor.fileFor(BtiFormat.Components.DATA));

        dataFileBuilder.bufferSize(bufferSize);
        dataFileBuilder.withChunkCache(chunkCache);
        dataFileBuilder.mmapped(ioOptions.defaultDiskAccessMode);

        return dataFileBuilder;
    }
}
