TraceReader.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package br.ufrgs.inf.prosoft.trace;

import com.google.gson.Gson;
import com.google.gson.JsonSyntaxException;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Consumer;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.stream.Stream;

/**
 *
 * @author romulo
 */
public class TraceReader {

    private static final Logger logger = Logger.getLogger(TraceReader.class.getName());

    public static List<Trace> partiallyParseFile(String path) {
        Traces.PATH = path;
        return parseFile(path, true);
    }

    public static List<Trace> parseFile(String path) {
        return parseFile(path, false);
    }

    public static String getLineCount(String path) throws IOException {
        try {
            Process process = Runtime.getRuntime().exec("wc -l " + path);
            Thread.sleep(2000);
            if (process.isAlive()) {
                return "timeout";
            }
            InputStream inputStream = process.getInputStream();
            StringBuilder count = new StringBuilder();
            int c;
            while (true) {
                c = inputStream.read();
                if (c == 32 || c == -1 || c == 10) {
                    break;
                }
                count.append((char) c);
            }
            return count.toString();
        } catch (Exception ex) {
            return ex.getMessage();
        }
    }

    private static List<Trace> parseFile(String path, boolean partial) {
        List<Trace> traces = new ArrayList<>();
        try {
            logger.log(Level.INFO, "Parsing {0} traces", getLineCount(path));
            Stream<String> lines = Files.lines(Paths.get(path));
            Gson gson = new Gson();
            lines.forEach(new Consumer<String>() {
                int index = 0;

                @Override
                public void accept(String line) {
                    try {
                        Trace trace;
                        if (partial) {
                            trace = gson.fromJson(line, TraceReference.class);
                            ((TraceReference) trace).setIndex(index);
                        } else {
                            trace = gson.fromJson(line, TraceConcrete.class);
                        }
                        traces.add(trace);
                        System.out.print(".");
                        System.out.flush();
                        if (index != 0 && index % 100 == 0) {
                            System.out.println();
                        }
                    } catch (JsonSyntaxException e) {
                        if (line.length() > 2000) {
                            line = line.substring(0, 2000);
                        }
                        logger.log(Level.INFO, "\nMalformed Trace {0}: {1}", new java.lang.Object[]{index, line});
                    } finally {
                        index++;
                    }
                }
            });
            System.out.println();
        } catch (IOException ex) {
            logger.log(Level.SEVERE, null, ex);
        }
        return traces;
    }

}