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

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Here is the source code for io.druid.segment.data.VSizeColumnarIntsSerializerTest.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.primitives.Ints;
import io.druid.segment.writeout.OffHeapMemorySegmentWriteOutMedium;
import io.druid.segment.writeout.SegmentWriteOutMedium;
import io.druid.segment.writeout.WriteOutBytes;
import org.apache.commons.io.IOUtils;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.nio.ByteBuffer;
import java.util.Random;

import static org.junit.Assert.assertEquals;

public class VSizeColumnarIntsSerializerTest {
    private static final int[] MAX_VALUES = new int[] { 0xFF, 0xFFFF, 0xFFFFFF, 0x0FFFFFFF };

    private final SegmentWriteOutMedium segmentWriteOutMedium = new OffHeapMemorySegmentWriteOutMedium();
    private final Random rand = new Random(0);
    private int[] vals;

    @Before
    public void setUp() {
        vals = null;
    }

    @After
    public void tearDown() throws Exception {
        segmentWriteOutMedium.close();
    }

    private void generateVals(final int totalSize, final int maxValue) {
        vals = new int[totalSize];
        for (int i = 0; i < vals.length; ++i) {
            vals[i] = rand.nextInt(maxValue);
        }
    }

    private void checkSerializedSizeAndData() throws Exception {
        int maxValue = vals.length == 0 ? 0 : Ints.max(vals);
        VSizeColumnarIntsSerializer writer = new VSizeColumnarIntsSerializer(segmentWriteOutMedium, maxValue);

        VSizeColumnarInts intsFromList = VSizeColumnarInts.fromIndexedInts(new ArrayBasedIndexedInts(vals),
                maxValue);
        writer.open();
        for (int val : vals) {
            writer.addValue(val);
        }
        long writtenLength = writer.getSerializedSize();
        WriteOutBytes writeOutBytes = segmentWriteOutMedium.makeWriteOutBytes();
        writer.writeTo(writeOutBytes, null);

        assertEquals(writtenLength, intsFromList.getSerializedSize());

        // read from ByteBuffer and check values
        VSizeColumnarInts intsFromByteBuffer = VSizeColumnarInts
                .readFromByteBuffer(ByteBuffer.wrap(IOUtils.toByteArray(writeOutBytes.asInputStream())));
        assertEquals(vals.length, intsFromByteBuffer.size());
        for (int i = 0; i < vals.length; ++i) {
            assertEquals(vals[i], intsFromByteBuffer.get(i));
        }
    }

    @Test
    public void testAdd() throws Exception {
        for (int maxValue : MAX_VALUES) {
            generateVals(rand.nextInt(100) + 10, maxValue);
            checkSerializedSizeAndData();
        }
    }

    @Test
    public void testWriteEmpty() throws Exception {
        vals = new int[0];
        checkSerializedSizeAndData();
    }
}