org.apache.flink.streaming.util.TestDataUtil.java Source code

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Here is the source code for org.apache.flink.streaming.util.TestDataUtil.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.flink.streaming.util;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;

import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.io.FileUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class TestDataUtil {

    // TODO: Exception handling
    // TODO: check checksum after download
    private static final Log LOG = LogFactory.getLog(TestDataUtil.class);
    public static final String testDataDir = "src/test/resources/testdata/";
    public static final String testRepoUrl = "http://info.ilab.sztaki.hu/~mbalassi/flink-streaming/testdata/";
    public static final String testChekSumDir = "src/test/resources/testdata_checksum/";

    public static void downloadIfNotExists(String fileName) {

        File file = new File(testDataDir + fileName);
        File checkFile = new File(testChekSumDir + fileName + ".md5");
        String checkSumDesired = new String();
        String checkSumActaul = new String();

        File testDataDirectory = new File(testDataDir);
        testDataDirectory.mkdirs();

        try {
            FileReader fileReader = new FileReader(checkFile);
            BufferedReader bufferedReader = new BufferedReader(fileReader);
            checkSumDesired = bufferedReader.readLine();
            bufferedReader.close();
            fileReader.close();
        } catch (FileNotFoundException e) {
            throw new RuntimeException("File not found: " + file.getAbsolutePath(), e);
        } catch (IOException e) {
            throw new RuntimeException("Cannot read file: " + file.getAbsolutePath(), e);
        }

        if (file.exists()) {
            if (LOG.isInfoEnabled()) {
                LOG.info(fileName + " already exists.");
            }

            try {
                checkSumActaul = DigestUtils.md5Hex(FileUtils.readFileToByteArray(file));
            } catch (IOException e) {
                throw new RuntimeException("Cannot read file to byte array: " + file.getAbsolutePath(), e);
            }
            if (!checkSumActaul.equals(checkSumDesired)) {
                if (LOG.isInfoEnabled()) {
                    LOG.info("Checksum is incorrect.");
                    LOG.info("Downloading file.");
                }
                download(fileName);
            }
        } else {
            if (LOG.isInfoEnabled()) {
                LOG.info("File does not exist.");
                LOG.info("Downloading file.");
            }
            download(fileName);
        }

    }

    public static void download(String fileName) {
        LOG.info("downloading " + fileName);

        try {
            URL website = new URL(testRepoUrl + fileName);
            BufferedReader bReader = new BufferedReader(new InputStreamReader(website.openStream()));
            File outFile = new File(testDataDir + fileName);
            BufferedWriter bWriter = new BufferedWriter(new FileWriter(outFile));

            String line;
            while ((line = bReader.readLine()) != null) {
                bWriter.write(line);
                bWriter.newLine();
            }
            bWriter.close();
        } catch (MalformedURLException e) {
            throw new RuntimeException("URL is malformed: ", e);
        } catch (IOException e) {
            throw new RuntimeException("Unexpected problem while downloading file " + fileName, e);
        }
    }
}