GATE Embedded runtime - web-services

Question

I want to use "GATE" through web. Then I decide to create a SOAP web service in java with help of GATE Embedded.
But for the same document and saved Pipeline, I have a different run-time duration, when GATE Embedded runs as a java web service.
The same code has a constant run-time when it runs as a Java Application project.
In the web service, the run-time will be increasing after each execution until I get a Timeout error.
Does any one have this kind of experience?
This is my Code:
#WebService(serviceName = "GateWS")
public class GateWS {
#WebMethod(operationName = "gateengineapi")
public String gateengineapi(#WebParam(name = "PipelineNumber") String PipelineNumber, #WebParam(name = "Documents") String Docs) throws Exception {
try {
System.setProperty("gate.home", "C:\\GATE\\");
System.setProperty("shell.path", "C:\\cygwin2\\bin\\sh.exe");
Gate.init();
File GateHome = Gate.getGateHome();
File FrenchGapp = new File(GateHome, PipelineNumber);
CorpusController FrenchController;
FrenchController = (CorpusController) PersistenceManager.loadObjectFromFile(FrenchGapp);
Corpus corpus = Factory.newCorpus("BatchProcessApp Corpus");
FrenchController.setCorpus(corpus);
File docFile = new File(GateHome, Docs);
Document doc = Factory.newDocument(docFile.toURL(), "utf-8");
corpus.add(doc);
FrenchController.execute();
String docXMLString = null;
docXMLString = doc.toXml();
String outputFileName = doc.getName() + ".out.xml";
File outputFile = new File(docFile.getParentFile(), outputFileName);
FileOutputStream fos = new FileOutputStream(outputFile);
BufferedOutputStream bos = new BufferedOutputStream(fos);
OutputStreamWriter out;
out = new OutputStreamWriter(bos, "utf-8");
out.write(docXMLString);
out.close();
gate.Factory.deleteResource(doc);
return outputFileName;
} catch (Exception ex) {
return "ERROR: -> " + ex.getMessage();
}
}
}
I really appreciate any help you can provide.

Answer 1

The problem is that you're loading a new instance of the pipeline for every request, but then not freeing it again at the end of the request. GATE maintains a list internally of every PR/LR/controller that is loaded, so anything you load with Factory.createResource or PersistenceManager.loadObjectFrom... must be freed using Factory.deleteResource once it is no longer needed, typically using a try-finally:
FrenchController = (CorpusController) PersistenceManager.loadObjectFromFile(FrenchGapp);
try {
// ...
} finally {
Factory.deleteResource(FrenchController);
}
But...
Rather than loading a new instance of the pipeline every time, I would strongly recommend you explore a more efficient approach to load a smaller number of instances of the pipeline but keep them in memory to serve multiple requests. There is a fully worked-through example of this technique in the training materials on the GATE wiki, in particular module number 8 (track 2 Thursday).