93 lines
2.7 KiB
Java
93 lines
2.7 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.IOException;
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import java.io.OutputStreamWriter;
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import java.io.Serializable;
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import java.nio.charset.StandardCharsets;
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import java.util.ArrayList;
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import java.util.List;
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import org.apache.commons.io.IOUtils;
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import org.apache.hadoop.conf.Configuration;
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import org.apache.hadoop.fs.FSDataInputStream;
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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 org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import com.fasterxml.jackson.core.type.TypeReference;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import eu.dnetlib.dhp.actionmanager.project.PrepareProjects;
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import eu.dnetlib.dhp.actionmanager.project.utils.model.JsonTopic;
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import eu.dnetlib.dhp.actionmanager.project.utils.model.Project;
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import eu.dnetlib.dhp.application.ArgumentApplicationParser;
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/**
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* @author miriam.baglioni
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* @Date 28/02/23
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*/
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public class ReadTopics implements Serializable {
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private static final Logger log = LoggerFactory.getLogger(ReadTopics.class);
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private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
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public static void main(String[] args) throws Exception {
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String jsonConfiguration = IOUtils
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.toString(
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PrepareProjects.class
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.getResourceAsStream(
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"/eu/dnetlib/dhp/actionmanager/project/read_parameters.json"));
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final ArgumentApplicationParser parser = new ArgumentApplicationParser(jsonConfiguration);
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parser.parseArgument(args);
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final String inputPath = parser.get("inputPath");
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log.info("inputPath {}: ", inputPath);
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final String outputPath = parser.get("outputPath");
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log.info("outputPath {}: ", outputPath);
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final String hdfsNameNode = parser.get("hdfsNameNode");
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log.info("hdfsNameNode {}", hdfsNameNode);
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Configuration conf = new Configuration();
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conf.set("fs.defaultFS", hdfsNameNode);
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FileSystem fs = FileSystem.get(conf);
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readTopics(inputPath, outputPath, fs);
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}
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public static void readTopics(String inputFile, String workingPath, FileSystem fs) throws IOException {
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Path hdfsreadpath = new Path(inputFile);
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FSDataInputStream inputStream = fs.open(hdfsreadpath);
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ArrayList<JsonTopic> topics = OBJECT_MAPPER
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.readValue(
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IOUtils.toString(inputStream, "UTF-8"),
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new TypeReference<List<JsonTopic>>() {
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});
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Path hdfsWritePath = new Path(workingPath);
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if (fs.exists(hdfsWritePath)) {
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fs.delete(hdfsWritePath, false);
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}
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FSDataOutputStream fos = fs.create(hdfsWritePath);
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try (BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(fos, StandardCharsets.UTF_8))) {
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for (JsonTopic p : topics) {
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writer.write(OBJECT_MAPPER.writeValueAsString(p));
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writer.newLine();
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}
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}
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}
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}
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