de.tudarmstadt.ukp.dkpro.bigdata.io.hadoop.InputFormatTest.java Source code

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/*******************************************************************************
 * Copyright 2013
 * TU Darmstadt, FG Sprachtechnologie
 * 
 * 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 de.tudarmstadt.ukp.dkpro.bigdata.io.hadoop;

import static org.junit.Assert.assertEquals;

import java.io.File;
import java.io.IOException;

import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.FileSplit;
import org.apache.hadoop.mapred.InputFormat;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.RecordReader;
import org.apache.hadoop.mapred.Reporter;

import de.tudarmstadt.ukp.dkpro.bigdata.io.hadoop.CrawlerRecord;

/**
 * Base class providing helper methods for InputFormat unit tests
 * 
 * @author Johannes Simon
 *
 */
public class InputFormatTest {

    public InputFormatTest() {
        super();
    }

    protected void checkRecordValidity(Text key, CrawlerRecord value) {
        //      System.out.println("Found record: " + key);
        assertEquals("Keys must not be empty", key.toString().isEmpty(), false);
        assertEquals("Key must be URL of record", key.toString(), value.getURL());
    }

    protected void checkNRecordsRemaining(RecordReader<Text, CrawlerRecord> recordReader, int n)
            throws IOException {
        int numRecordsRemaining = checkRecordsRemaining(recordReader);
        assertEquals(n, numRecordsRemaining);
    }

    protected int checkRecordsRemaining(RecordReader<Text, CrawlerRecord> recordReader) throws IOException {
        int numRecordsRemaining = 0;
        while (true) {
            Text key = recordReader.createKey();
            CrawlerRecord value = recordReader.createValue();
            boolean recordRead = recordReader.next(key, value);

            // Check every record read
            if (recordRead) {
                numRecordsRemaining++;
                checkRecordValidity(key, value);
            } else {
                break;
            }
        }

        return numRecordsRemaining;
    }

    public int readArchiveInSplits(String archiveFile, int bytesPerSplit,
            InputFormat<Text, CrawlerRecord> inputFormat, JobConf job) throws IOException {
        Path filePath = new Path(archiveFile);
        File file = new File(archiveFile);

        int numRecordsRead = 0;

        System.out.println("Reading archive of size " + file.length() + " in splits of size " + bytesPerSplit);
        for (int offset = 0; offset < file.length(); offset += bytesPerSplit) {
            //         System.out.println("Read from " + offset + " to " + (offset + bytesPerSplit));
            FileSplit inputSplit = new FileSplit(filePath, offset, bytesPerSplit, (String[]) null);
            RecordReader<Text, CrawlerRecord> recordReader = inputFormat.getRecordReader(inputSplit, job,
                    Reporter.NULL);
            numRecordsRead += checkRecordsRemaining(recordReader);
        }

        return numRecordsRead;
    }
}