com.datatorrent.lib.io.fs.FixedBytesBlockReaderTest.java Source code

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Here is the source code for com.datatorrent.lib.io.fs.FixedBytesBlockReaderTest.java

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/*
 * Copyright (c) 2014 DataTorrent, Inc. ALL Rights Reserved.
 *
 * 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.datatorrent.lib.io.fs;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;

import org.apache.commons.io.FileUtils;
import org.junit.Assert;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TestWatcher;
import org.junit.runner.Description;

import com.datatorrent.api.Attribute;
import com.datatorrent.api.Context;
import com.datatorrent.api.DAG;

import com.datatorrent.common.util.Slice;
import com.datatorrent.lib.helper.OperatorContextTestHelper;
import com.datatorrent.lib.testbench.CollectorTestSink;

/**
 * Tests for {@link FixedBytesBlockReader}.
 */
public class FixedBytesBlockReaderTest {
    public static class TestMeta extends TestWatcher {
        String output;
        File dataFile;
        Context.OperatorContext readerContext;
        FixedBytesBlockReader blockReader;
        CollectorTestSink<Object> blockMetadataSink;
        CollectorTestSink<Object> messageSink;

        @Override
        protected void starting(org.junit.runner.Description description) {
            output = "target/" + description.getClassName() + "/" + description.getMethodName();
            try {
                FileUtils.forceMkdir(new File(output));
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
            dataFile = new File("src/test/resources/reader_test_data.csv");
            blockReader = new FixedBytesBlockReader();

            Attribute.AttributeMap.DefaultAttributeMap readerAttr = new Attribute.AttributeMap.DefaultAttributeMap();
            readerAttr.put(DAG.APPLICATION_ID, Long.toHexString(System.currentTimeMillis()));
            readerAttr.put(Context.OperatorContext.SPIN_MILLIS, 10);
            readerContext = new OperatorContextTestHelper.TestIdOperatorContext(1, readerAttr);

            blockReader.setup(readerContext);

            messageSink = new CollectorTestSink<Object>();
            blockReader.messages.setSink(messageSink);

            blockMetadataSink = new CollectorTestSink<Object>();
            blockReader.blocksMetadataOutput.setSink(blockMetadataSink);
        }

        @Override
        protected void finished(Description description) {
            blockReader.teardown();
            try {
                FileUtils.forceDelete(new File(output));
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
    }

    @Rule
    public TestMeta testMeta = new TestMeta();

    @Test
    public void testBytesReceived() throws IOException {
        long blockSize = 1500;
        int noOfBlocks = (int) ((testMeta.dataFile.length() / blockSize)
                + (((testMeta.dataFile.length() % blockSize) == 0) ? 0 : 1));

        testMeta.blockReader.beginWindow(1);

        for (int i = 0; i < noOfBlocks; i++) {
            FileSplitter.BlockMetadata blockMetadata = new FileSplitter.BlockMetadata(i * blockSize,
                    i == noOfBlocks - 1 ? testMeta.dataFile.length() : (i + 1) * blockSize,
                    testMeta.dataFile.getAbsolutePath(), i, i == noOfBlocks - 1);
            testMeta.blockReader.blocksMetadataInput.process(blockMetadata);
        }

        testMeta.blockReader.endWindow();

        List<Object> messages = testMeta.messageSink.collectedTuples;
        long totatBytesReceived = 0;

        File outputFile = new File(testMeta.output + "/reader_test_data.csv");
        FileOutputStream outputStream = new FileOutputStream(outputFile);

        for (Object message : messages) {
            @SuppressWarnings("unchecked")
            AbstractBlockReader.ReaderRecord<Slice> msg = (AbstractBlockReader.ReaderRecord<Slice>) message;
            totatBytesReceived += msg.getRecord().length;
            outputStream.write(msg.getRecord().buffer);
        }
        outputStream.close();

        Assert.assertEquals("number of bytes", testMeta.dataFile.length(), totatBytesReceived);
        FileUtils.contentEquals(testMeta.dataFile, outputFile);
    }

}