com.linkedin.pinot.index.readerwriter.VarByteSingleValueReaderWriteTest.java Source code

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Here is the source code for com.linkedin.pinot.index.readerwriter.VarByteSingleValueReaderWriteTest.java

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/**
 * Copyright (C) 2014-2016 LinkedIn Corp. (pinot-core@linkedin.com)
 *
 * Licensed 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 com.linkedin.pinot.index.readerwriter;

import com.linkedin.pinot.common.segment.ReadMode;
import com.linkedin.pinot.core.io.compression.ChunkCompressor;
import com.linkedin.pinot.core.io.compression.ChunkCompressorFactory;
import com.linkedin.pinot.core.io.compression.ChunkDecompressor;
import com.linkedin.pinot.core.io.reader.impl.VarByteReaderContext;
import com.linkedin.pinot.core.io.reader.impl.v1.VarByteSingleValueReader;
import com.linkedin.pinot.core.io.writer.impl.v1.VarByteSingleValueWriter;
import com.linkedin.pinot.core.segment.memory.PinotDataBuffer;
import java.io.File;
import java.nio.channels.FileChannel;
import java.nio.charset.Charset;
import java.util.Random;
import org.apache.commons.io.FileUtils;
import org.apache.commons.lang.RandomStringUtils;
import org.testng.Assert;
import org.testng.annotations.Test;

/**
 * Unit test for {@link VarByteSingleValueReader} and {@link VarByteSingleValueWriter} classes.
 */
public class VarByteSingleValueReaderWriteTest {
    private static final Charset UTF_8 = Charset.forName("UTF-8");

    private static final int NUM_STRINGS = 5003;
    private static final int NUM_DOCS_PER_CHUNK = 1009;
    private static final int MAX_STRING_LENGTH = 101;
    private static final String TEST_FILE = System.getProperty("java.io.tmpdir") + File.separator
            + "varByteSVRTest";

    /**
     * This test writes {@link #NUM_STRINGS} using {@link VarByteSingleValueWriter}. It then reads
     * the strings using {@link VarByteSingleValueReader}, and asserts that what was written is the same as
     * what was read in.
     *
     * Number of docs and docs per chunk are chosen to generate complete as well partial chunks.
     *
     * @throws Exception
     */
    @Test
    public void test() throws Exception {
        String[] expected = new String[NUM_STRINGS];
        Random random = new Random();

        File outFile = new File(TEST_FILE);
        FileUtils.deleteQuietly(outFile);

        int maxStringLengthInBytes = 0;
        for (int i = 0; i < NUM_STRINGS; i++) {
            expected[i] = RandomStringUtils.random(random.nextInt(MAX_STRING_LENGTH));
            maxStringLengthInBytes = Math.max(maxStringLengthInBytes, expected[i].getBytes(UTF_8).length);
        }

        ChunkCompressor compressor = ChunkCompressorFactory.getCompressor("snappy");
        VarByteSingleValueWriter writer = new VarByteSingleValueWriter(outFile, compressor, NUM_STRINGS,
                NUM_DOCS_PER_CHUNK, maxStringLengthInBytes);

        for (int i = 0; i < NUM_STRINGS; i++) {
            writer.setString(i, expected[i]);
        }
        writer.close();

        PinotDataBuffer pinotDataBuffer = PinotDataBuffer.fromFile(outFile, ReadMode.mmap,
                FileChannel.MapMode.READ_ONLY, getClass().getName());

        ChunkDecompressor uncompressor = ChunkCompressorFactory.getDecompressor("snappy");
        VarByteSingleValueReader reader = new VarByteSingleValueReader(pinotDataBuffer, uncompressor);
        VarByteReaderContext context = reader.createContext();

        for (int i = 0; i < NUM_STRINGS; i++) {
            String actual = reader.getString(i, context);
            Assert.assertEquals(actual, expected[i]);
        }
        reader.close();
        FileUtils.deleteQuietly(outFile);
    }
}