org.apache.commons.io.input.TailerListener Java Examples

/**
 * Creates a CsvStreamReader with supplied separator and quote char.
 *
 * @param source The file to an underlying CSV source
 * @param separator The delimiter to use for separating entries
 * @param quoteChar The character to use for quoted elements
 * @param escape The character to use for escaping a separator or quote
 * @param line The line number to skip for start reading
 * @param strictQuotes Sets if characters outside the quotes are ignored
 * @param ignoreLeadingWhiteSpace If true, parser should ignore
 *  white space before a quote in a field
 */
private CsvStreamReader(Source source, char separator, char quoteChar,
                        char escape, int line, boolean strictQuotes,
                        boolean ignoreLeadingWhiteSpace) {
  super(new StringReader("")); // dummy call to base constructor
  contentQueue = new ArrayDeque<>();
  TailerListener listener = new CsvContentListener(contentQueue);
  tailer = Tailer.create(source.file(), listener, DEFAULT_MONITOR_DELAY,
      false, true, 4096);
  this.parser = new CSVParser(separator, quoteChar, escape, strictQuotes,
      ignoreLeadingWhiteSpace);
  this.skipLines = line;
  try {
    // wait for tailer to capture data
    Thread.sleep(DEFAULT_MONITOR_DELAY);
  } catch (InterruptedException e) {
    throw new RuntimeException(e);
  }
}
 

private void startTailingLog() {
  TailerListener listener =
      new TailerListenerAdapter() {
        @Override
        public void handle(String line) {
          System.out.println(testName + ": " + line);
        }
      };

  // Tail the log
  File file = new File(getBasedir() + File.separator + getLogFileName());
  try {
    if (file.exists()) {
      file.delete();
    }
    file.createNewFile();
  } catch (IOException e) {
    e.printStackTrace();
  }
  Tailer tailer = new Tailer(file, listener, TAIL_DELAY_MILLIS);
  Thread thread = new Thread(tailer);
  thread.setDaemon(true);
  thread.start();
}
 

/**
 * Creates a CsvStreamReader with supplied separator and quote char.
 *
 * @param source The file to an underlying CSV source
 * @param separator The delimiter to use for separating entries
 * @param quoteChar The character to use for quoted elements
 * @param escape The character to use for escaping a separator or quote
 * @param line The line number to skip for start reading
 * @param strictQuotes Sets if characters outside the quotes are ignored
 * @param ignoreLeadingWhiteSpace If true, parser should ignore
 *  white space before a quote in a field
 */
private CsvStreamReader(Source source, char separator, char quoteChar,
    char escape, int line, boolean strictQuotes,
    boolean ignoreLeadingWhiteSpace) {
  super(new StringReader("")); // dummy call to base constructor
  contentQueue = new ArrayDeque<>();
  TailerListener listener = new CsvContentListener(contentQueue);
  tailer = Tailer.create(source.file(), listener, DEFAULT_MONITOR_DELAY,
      false, true, 4096);
  this.parser = new CSVParser(separator, quoteChar, escape, strictQuotes,
      ignoreLeadingWhiteSpace);
  this.skipLines = line;
  try {
    // wait for tailer to capture data
    Thread.sleep(DEFAULT_MONITOR_DELAY);
  } catch (InterruptedException e) {
    throw new RuntimeException(e);
  }
}
 

public void tail(TailerListener listener) {

        File file = new File(
                             fileLocation);
        Tailer tailer = Tailer.create(file, listener, 10);

        tailer.run();
    }
 

public void tail(TailerListener listener, String alias) {
    File file = logLookup.map(l -> l.lookup(alias))
                         .orElse(new File(
                                          fileLocation));
    Tailer tailer = Tailer.create(file, listener, 10);
    tailer.run();
}
 

public Observable<String> getStream(final long pollIntervalMs) {
    return Observable.create(new ObservableOnSubscribe<String>() {

        @Override
        public void subscribe(ObservableEmitter<String> emitter) throws Exception {
            TailerListener listener = createListener(emitter);
            final Tailer tailer = new Tailer(file, listener, pollIntervalMs);
            try {
                tailer.run();
            } catch (Throwable e) {
                emitter.onError(e);
            }
        }
    });
}