io.druid.segment.data.IntermediateLongSupplierSerializer.java Source code

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Here is the source code for io.druid.segment.data.IntermediateLongSupplierSerializer.java

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/*
 * Licensed to Metamarkets Group Inc. (Metamarkets) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Metamarkets 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 io.druid.segment.data;

import com.google.common.collect.BiMap;
import com.google.common.collect.HashBiMap;
import com.google.common.io.ByteSink;
import com.google.common.io.CountingOutputStream;
import com.google.common.math.LongMath;
import com.google.common.primitives.Longs;

import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.nio.ByteOrder;
import java.nio.channels.WritableByteChannel;

public class IntermediateLongSupplierSerializer implements LongSupplierSerializer {

    private final IOPeon ioPeon;
    private final String filenameBase;
    private final String tempFile;
    private final ByteOrder order;
    private final CompressedObjectStrategy.CompressionStrategy compression;
    private CountingOutputStream tempOut = null;

    private int numInserted = 0;

    private BiMap<Long, Integer> uniqueValues = HashBiMap.create();
    private long maxVal = Long.MIN_VALUE;
    private long minVal = Long.MAX_VALUE;

    private LongSupplierSerializer delegate;

    public IntermediateLongSupplierSerializer(IOPeon ioPeon, String filenameBase, ByteOrder order,
            CompressedObjectStrategy.CompressionStrategy compression) {
        this.ioPeon = ioPeon;
        this.tempFile = filenameBase + ".temp";
        this.filenameBase = filenameBase;
        this.order = order;
        this.compression = compression;
    }

    public void open() throws IOException {
        tempOut = new CountingOutputStream(ioPeon.makeOutputStream(tempFile));
    }

    public int size() {
        return numInserted;
    }

    public void add(long value) throws IOException {
        tempOut.write(Longs.toByteArray(value));
        ++numInserted;
        if (uniqueValues.size() <= CompressionFactory.MAX_TABLE_SIZE && !uniqueValues.containsKey(value)) {
            uniqueValues.put(value, uniqueValues.size());
        }
        if (value > maxVal) {
            maxVal = value;
        }
        if (value < minVal) {
            minVal = value;
        }
    }

    private void makeDelegate() throws IOException {
        CompressionFactory.LongEncodingWriter writer;
        long delta;
        try {
            delta = LongMath.checkedSubtract(maxVal, minVal);
        } catch (ArithmeticException e) {
            delta = -1;
        }
        if (uniqueValues.size() <= CompressionFactory.MAX_TABLE_SIZE) {
            writer = new TableLongEncodingWriter(uniqueValues);
        } else if (delta != -1 && delta != Long.MAX_VALUE) {
            writer = new DeltaLongEncodingWriter(minVal, delta);
        } else {
            writer = new LongsLongEncodingWriter(order);
        }

        if (compression == CompressedObjectStrategy.CompressionStrategy.NONE) {
            delegate = new EntireLayoutLongSupplierSerializer(ioPeon, filenameBase, order, writer);
        } else {
            delegate = new BlockLayoutLongSupplierSerializer(ioPeon, filenameBase, order, writer, compression);
        }

        DataInputStream tempIn = new DataInputStream(new BufferedInputStream(ioPeon.makeInputStream(tempFile)));
        delegate.open();
        while (tempIn.available() > 0) {
            delegate.add(tempIn.readLong());
        }
    }

    public void closeAndConsolidate(ByteSink consolidatedOut) throws IOException {
        tempOut.close();
        makeDelegate();
        delegate.closeAndConsolidate(consolidatedOut);
    }

    public void close() throws IOException {
        tempOut.close();
        makeDelegate();
        delegate.close();
    }

    public long getSerializedSize() {
        return delegate.getSerializedSize();
    }

    public void writeToChannel(WritableByteChannel channel) throws IOException {
        delegate.writeToChannel(channel);
    }
}