org.apache.druid.data.input.impl.FileIteratingFirehoseTest.java Source code

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Here is the source code for org.apache.druid.data.input.impl.FileIteratingFirehoseTest.java

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/*
 * 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.druid.data.input.impl;

import com.google.common.base.Joiner;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import org.apache.commons.io.LineIterator;
import org.apache.druid.data.input.InputRow;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;

import java.io.Closeable;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.IntStream;

@RunWith(Parameterized.class)
public class FileIteratingFirehoseTest {
    @Parameters(name = "{0}, {1}")
    public static Collection<Object[]> constructorFeeder() {
        final List<List<String>> inputTexts = ImmutableList.of(ImmutableList.of("2000,foo"),
                ImmutableList.of("2000,foo\n2000,bar\n"), ImmutableList.of("2000,foo\n2000,bar\n", "2000,baz"),
                ImmutableList.of("2000,foo\n2000,bar\n", "", "2000,baz"),
                ImmutableList.of("2000,foo\n2000,bar\n", "", "2000,baz", ""),
                ImmutableList.of("2000,foo\n2000,bar\n2000,baz", "", "2000,baz", "2000,foo\n2000,bar\n3000,baz"),
                ImmutableList.of(""), ImmutableList.of());

        final List<Object[]> args = new ArrayList<>();
        for (int numSkipHeadRows = 0; numSkipHeadRows < 3; numSkipHeadRows++) {
            for (List<String> texts : inputTexts) {
                args.add(new Object[] { texts, numSkipHeadRows });
            }
        }

        return args;
    }

    private static final char[] LINE_CHARS = "\n".toCharArray();

    private final StringInputRowParser parser;
    private final List<String> inputs;
    private final List<String> expectedResults;

    public FileIteratingFirehoseTest(List<String> texts, int numSkipHeaderRows) {
        parser = new StringInputRowParser(new CSVParseSpec(new TimestampSpec("ts", "auto", null),
                new DimensionsSpec(DimensionsSpec.getDefaultSchemas(ImmutableList.of("x")), null, null), ",",
                ImmutableList.of("ts", "x"), false, numSkipHeaderRows), null);

        this.inputs = texts;
        this.expectedResults = inputs.stream().map(input -> input.split("\n")).flatMap(lines -> {
            final List<String> filteredLines = Arrays.asList(lines).stream().filter(line -> line.length() > 0)
                    .map(line -> line.split(",")[1]).collect(Collectors.toList());

            final int numRealSkippedRows = Math.min(filteredLines.size(), numSkipHeaderRows);
            IntStream.range(0, numRealSkippedRows).forEach(i -> filteredLines.set(i, null));
            return filteredLines.stream();
        }).collect(Collectors.toList());
    }

    @Test
    public void testFirehose() throws Exception {
        final List<LineIterator> lineIterators = inputs.stream().map(s -> new LineIterator(new StringReader(s)))
                .collect(Collectors.toList());

        try (final FileIteratingFirehose firehose = new FileIteratingFirehose(lineIterators.iterator(), parser)) {
            final List<String> results = Lists.newArrayList();

            while (firehose.hasMore()) {
                final InputRow inputRow = firehose.nextRow();
                if (inputRow == null) {
                    results.add(null);
                } else {
                    results.add(Joiner.on("|").join(inputRow.getDimension("x")));
                }
            }

            Assert.assertEquals(expectedResults, results);
        }
    }

    @Test(expected = RuntimeException.class)
    public void testClose() throws IOException {
        final LineIterator lineIterator = new LineIterator(new Reader() {
            @Override
            public int read(char[] cbuf, int off, int len) {
                System.arraycopy(LINE_CHARS, 0, cbuf, 0, LINE_CHARS.length);
                return LINE_CHARS.length;
            }

            @Override
            public void close() {
                throw new RuntimeException("close test for FileIteratingFirehose");
            }
        });

        final TestCloseable closeable = new TestCloseable();
        final FileIteratingFirehose firehose = new FileIteratingFirehose(ImmutableList.of(lineIterator).iterator(),
                parser, closeable);
        firehose.hasMore(); // initialize lineIterator
        firehose.close();
        Assert.assertTrue(closeable.closed);
    }

    private static final class TestCloseable implements Closeable {
        private boolean closed;

        @Override
        public void close() {
            closed = true;
        }
    }
}