io.druid.segment.writeout.WriteOutBytesTest.java Source code

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Here is the source code for io.druid.segment.writeout.WriteOutBytesTest.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.writeout;

import com.google.common.io.Files;
import com.google.common.primitives.Ints;
import io.druid.java.util.common.StringUtils;
import org.apache.commons.io.IOUtils;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;

import java.io.IOException;
import java.nio.BufferUnderflowException;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;
import java.util.Collection;

@RunWith(Parameterized.class)
public class WriteOutBytesTest {
    @Parameterized.Parameters
    public static Collection<Object[]> constructorFeeder() throws IOException {
        return Arrays.asList(new Object[] { new TmpFileSegmentWriteOutMedium(Files.createTempDir()) },
                new Object[] { new OffHeapMemorySegmentWriteOutMedium() },
                new Object[] { new OnHeapMemorySegmentWriteOutMedium() });
    }

    private final SegmentWriteOutMedium segmentWriteOutMedium;

    public WriteOutBytesTest(SegmentWriteOutMedium segmentWriteOutMedium) {
        this.segmentWriteOutMedium = segmentWriteOutMedium;
    }

    @Test
    public void testWriteOutBytes() throws IOException {
        WriteOutBytes writeOutBytes = segmentWriteOutMedium.makeWriteOutBytes();

        writeOutBytes.write('1');
        verifyContents(writeOutBytes, "1");

        writeOutBytes.writeInt(Ints.fromBytes((byte) '2', (byte) '3', (byte) '4', (byte) '5'));
        verifyContents(writeOutBytes, "12345");

        writeOutBytes.write(new byte[] { 'a' });
        verifyContents(writeOutBytes, "12345a");

        writeOutBytes.write(new byte[] { 'a', 'b', 'c' }, 1, 1);
        verifyContents(writeOutBytes, "12345ab");

        ByteBuffer bb = ByteBuffer.wrap(new byte[] { 'a', 'b', 'c' });
        bb.position(2);
        writeOutBytes.write(bb);
        Assert.assertEquals(3, bb.position());
        verifyContents(writeOutBytes, "12345abc");
    }

    private void verifyContents(WriteOutBytes writeOutBytes, String expected) throws IOException {
        Assert.assertEquals(expected, IOUtils.toString(writeOutBytes.asInputStream(), StandardCharsets.US_ASCII));
        ByteBuffer bb = ByteBuffer.allocate((int) writeOutBytes.size());
        writeOutBytes.readFully(0, bb);
        bb.flip();
        Assert.assertEquals(expected, StringUtils.fromUtf8(bb));
    }

    @Test
    public void testCrossBufferRandomAccess() throws IOException {
        WriteOutBytes writeOutBytes = segmentWriteOutMedium.makeWriteOutBytes();
        for (int i = 0; i < ByteBufferWriteOutBytes.BUFFER_SIZE; i++) {
            writeOutBytes.write('0');
        }
        writeOutBytes.write('1');
        writeOutBytes.write('2');
        writeOutBytes.write('3');
        ByteBuffer bb = ByteBuffer.allocate(4);
        writeOutBytes.readFully(ByteBufferWriteOutBytes.BUFFER_SIZE - 1, bb);
        bb.flip();
        Assert.assertEquals("0123", StringUtils.fromUtf8(bb));
    }

    @Test(expected = BufferUnderflowException.class)
    public void testReadFullyUnderflow() throws IOException {
        WriteOutBytes writeOutBytes = segmentWriteOutMedium.makeWriteOutBytes();
        writeOutBytes.write('1');
        writeOutBytes.readFully(0, ByteBuffer.allocate(2));
    }

    @Test
    public void testReadFullyEmptyAtTheEnd() throws IOException {
        WriteOutBytes writeOutBytes = segmentWriteOutMedium.makeWriteOutBytes();
        writeOutBytes.write('1');
        writeOutBytes.readFully(1, ByteBuffer.allocate(0));
    }
}