com.datatorrent.lib.io.block.FSSliceReaderTest.java Source code

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Here is the source code for com.datatorrent.lib.io.block.FSSliceReaderTest.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 com.datatorrent.lib.io.block;

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

import org.junit.Assert;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TestWatcher;
import org.junit.runner.Description;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;

import org.apache.commons.io.FileUtils;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;

import com.datatorrent.api.Attribute;
import com.datatorrent.api.Context;
import com.datatorrent.api.DAG;
import com.datatorrent.lib.helper.OperatorContextTestHelper;
import com.datatorrent.lib.testbench.CollectorTestSink;
import com.datatorrent.netlet.util.Slice;

import static org.mockito.Mockito.when;

/**
 * Tests for {@link FSSliceReader}.
 */
public class FSSliceReaderTest {
    protected FSSliceReader getBlockReader() {
        return new FSSliceReader();
    }

    public class TestMeta extends TestWatcher {
        public String output;
        public File dataFile;
        public Context.OperatorContext readerContext;
        public FSSliceReader blockReader;
        public CollectorTestSink<Object> blockMetadataSink;
        public 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 = getBlockReader();

            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<>();
            blockReader.messages.setSink(messageSink);

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

        @Override
        protected void finished(Description description) {
            blockReader.teardown();
            try {
                FileUtils.forceDelete(new File("target/" + description.getClassName()));
            } 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++) {
            BlockMetadata.FileBlockMetadata blockMetadata = new BlockMetadata.FileBlockMetadata(
                    testMeta.dataFile.getAbsolutePath(), i, i * blockSize,
                    i == noOfBlocks - 1 ? testMeta.dataFile.length() : (i + 1) * blockSize, i == noOfBlocks - 1,
                    i - 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);
    }

    @Mock
    FileSystem fileSystem;

    public class FSTestReader extends FSSliceReader {
        @Override
        protected FileSystem getFSInstance() throws IOException {
            return fileSystem;
        }
    }

    @Before
    public void beforeTest() {
        MockitoAnnotations.initMocks(this);
    }

    @Test
    public void testBlockSize() throws IOException {
        long blockSize = 1000;
        Path path = new Path(testMeta.output);
        when(fileSystem.getDefaultBlockSize(path)).thenReturn(blockSize);
        Attribute.AttributeMap.DefaultAttributeMap readerAttr = new Attribute.AttributeMap.DefaultAttributeMap();
        readerAttr.put(DAG.APPLICATION_ID, Long.toHexString(System.currentTimeMillis()));
        readerAttr.put(Context.OperatorContext.SPIN_MILLIS, 10);

        FSTestReader reader = new FSTestReader();
        reader.setBasePath(testMeta.output);
        reader.setup(new OperatorContextTestHelper.TestIdOperatorContext(1, readerAttr));
        Assert.assertEquals("Block Size", blockSize,
                (long) ((ReaderContext.FixedBytesReaderContext) reader.getReaderContext()).getLength());
    }
}