CrawlerEventListener configuration Question

[LeMoussel]

I implementing this :

import java.io.FileWriter;
import java.io.IOException;

import com.norconex.collector.core.CollectorException;
import com.norconex.collector.core.crawler.ICrawler;
import com.norconex.collector.core.crawler.event.CrawlerEvent;
import com.norconex.collector.core.crawler.event.ICrawlerEventListener;

public class MyCrawlerEventListener implements ICrawlerEventListener {
  private String outputFile;

  @Override
  public void crawlerEvent(final ICrawler crawler, final CrawlerEvent event) {
    final String type = event.getEventType();

    // Create new file on crawler start
    if (CrawlerEvent.CRAWLER_STARTED.equals(type)) {
      writeLine("Crawler Start", false);
      return;
    }

    // Do some stuff .....
  }

  private void writeLine(final String message, final boolean append) {
    try (FileWriter out = new FileWriter(outputFile, append)) {
      out.write(message);
      out.write('\n');
    } catch (final IOException e) {
      throw new CollectorException("Cannot write bad link to file.", e);
    }
  }
}

with this config :

    <crawlerListeners>
      <listener class="MyCrawlerEventListener">
        <outputFile>test.tsv</outputFile>
      </listener>
    </crawlerListeners>

Variable outputFile is not filled (always null value). It should have the value test.tsv

I don't understand why .....

[essiembre]

The mapping is not automatic. Try having your listener also implement IXMLConfigurable and add somethign like this:

    @Override
    public void loadFromXML(Reader in) throws IOException {
        XMLConfiguration xml = XMLConfigurationUtil.newXMLConfiguration(in);
        outputFile = xml.getString("outputFile", outputFile));
    }

    @Override
    public void saveToXML(Writer out) throws IOException {
        // You can leave this method blank if you have no use for savign back the XML
        try {
            EnhancedXMLStreamWriter writer = new EnhancedXMLStreamWriter(out);
            writer.writeStartElement("listener");
            writer.writeAttribute("class", getClass().getCanonicalName());
            writer.writeElementString("outputFile", outputFile);
            writer.writeEndElement();
            writer.flush();
            writer.close();
        } catch (XMLStreamException e) {
            throw new IOException("Cannot save as XML.", e);
        }        
    }

[LeMoussel]

OK. Thank you Pascal for your help.