forked from D-Net/dnet-hadoop
100 lines
2.8 KiB
Java
100 lines
2.8 KiB
Java
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package eu.dnetlib.dhp.actionmanager.project.utils;
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import java.io.BufferedWriter;
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import java.io.Closeable;
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import java.io.IOException;
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import java.io.OutputStreamWriter;
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import java.nio.charset.StandardCharsets;
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import org.apache.commons.io.IOUtils;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.apache.hadoop.conf.Configuration;
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import org.apache.hadoop.fs.FSDataOutputStream;
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import org.apache.hadoop.fs.FileSystem;
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import org.apache.hadoop.fs.Path;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import eu.dnetlib.dhp.application.ArgumentApplicationParser;
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import eu.dnetlib.dhp.collection.HttpConnector2;
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/**
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* Applies the parsing of a csv file and writes the Serialization of it in hdfs
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*/
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public class ReadCSV implements Closeable {
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private static final Log log = LogFactory.getLog(ReadCSV.class);
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private final Configuration conf;
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private final BufferedWriter writer;
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private final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
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private final String csvFile;
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public static void main(final String[] args) throws Exception {
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final ArgumentApplicationParser parser = new ArgumentApplicationParser(
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IOUtils
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.toString(
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ReadCSV.class
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.getResourceAsStream(
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"/eu/dnetlib/dhp/actionmanager/project/parameters.json")));
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parser.parseArgument(args);
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final String fileURL = parser.get("fileURL");
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final String hdfsPath = parser.get("hdfsPath");
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final String hdfsNameNode = parser.get("hdfsNameNode");
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final String classForName = parser.get("classForName");
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try (final ReadCSV readCSV = new ReadCSV(hdfsPath, hdfsNameNode, fileURL)) {
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log.info("Getting CSV file...");
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readCSV.execute(classForName);
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}
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}
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public void execute(final String classForName) throws Exception {
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CSVParser csvParser = new CSVParser();
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csvParser
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.parse(csvFile, classForName)
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.stream()
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.forEach(p -> write(p));
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}
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@Override
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public void close() throws IOException {
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writer.close();
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}
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public ReadCSV(
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final String hdfsPath,
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final String hdfsNameNode,
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final String fileURL)
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throws Exception {
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this.conf = new Configuration();
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this.conf.set("fs.defaultFS", hdfsNameNode);
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HttpConnector2 httpConnector = new HttpConnector2();
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FileSystem fileSystem = FileSystem.get(this.conf);
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Path hdfsWritePath = new Path(hdfsPath);
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FSDataOutputStream fsDataOutputStream = null;
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if (fileSystem.exists(hdfsWritePath)) {
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fileSystem.delete(hdfsWritePath, false);
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}
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fsDataOutputStream = fileSystem.create(hdfsWritePath);
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this.writer = new BufferedWriter(new OutputStreamWriter(fsDataOutputStream, StandardCharsets.UTF_8));
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this.csvFile = httpConnector.getInputSource(fileURL);
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}
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protected void write(final Object p) {
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try {
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writer.write(OBJECT_MAPPER.writeValueAsString(p));
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writer.newLine();
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} catch (final Exception e) {
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throw new RuntimeException(e);
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}
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}
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}
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