I have a servlet that executes GetFeatureInfo requests to a WMS with
responses in GML format; the response is then converted to a html
table and sent to the browser.
It appears that each time a GML response is parsed the stack grows
with quite a number of com.vividsolutions.jts.geom.Coordinate
instances slowly eating up memory. Before I start digging I'm
wondering if there's something obvious I missed?
Essentially the code is:
//Parse the gml input stream into a feature collection
private static String convertGML(final InputStream gmlStream, final
LayerDescriptor layer) throws IOException {
try {
final GML gml = new GML(Version.WFS1_0);
return featureCollectionConverter(
gml.decodeFeatureCollection(gmlStream), layer);
} catch (ParserConfigurationException | SAXException e) {
LOGGER.error("Fout tijdens parsen van GML. ", e);
return "";
} finally {
gmlStream.close();
}
}
//To create a table of features with specified attributes
private static String featureCollectionConverter(final
SimpleFeatureCollection features, final LayerDescriptor layer) {
final StringBuilder sb = new StringBuilder();
final String[] fieldNames = layer.getAttributes().split(",\\s*");
if (features != null && features.size() > 0) {
// start table
sb.append("<table id=\"attribuutTabel\" class=\"attribuutTabel\">");
sb.append("<caption>");
sb.append(RESOURCES.getString("KEY_INFO_TABEL_CAPTION"));
sb.append("</caption><thead><tr>");
for (final String n : fieldNames) {
sb.append("<th scope=\"col\">");
sb.append(NAMESFILTER.filterValue(n, layer.getId()));
sb.append("</th>");
}
sb.append("</tr></thead><tbody>");
// iterate features
int i = 0;
SimpleFeatureIterator iter = features.features();
while (iter.hasNext()) {
sb.append("<tr class=\"")
.append(((i++ % 2) == 0) ? "odd" : "even")
.append("\">");
final SimpleFeature f = iter.next();
for (final String n : fieldNames) {
if (VALUESFILTER.hasFilters()) {
sb.append("<td>")
.append(VALUESFILTER.filterValue(f.getAttribute(n)))
.append("</td>");
} else {
sb.append("<td>")
.append(f.getAttribute(n))
.append("</td>");
}
}
sb.append("</tr>");
}
sb.append("</tbody></table>");
iter.close();
iter = null;
LOGGER.debug("Gemaakte HTML tabel: " + sb);
return sb.toString();
} else {
LOGGER.debug("Geen attribuut info voor deze locatie/zoomnivo.");
return RESOURCES.getString("KEY_INFO_GEEN_FEATURES");
}
}
The full code lives at:
https://github.com/MinELenI/CBSviewer/blob/master/src/main/java/nl/mineleni/cbsviewer/servlet/wms/FeatureInfoResponseConverter.java
btw. this is with Geotools v11.0
--
Disclaimer;
This message is just a reflection of what I thought at the time of
sending. The message may contain information that is not intended for
you or that you don't understand.
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