package jade.domain.introspection;
import jade.core.Agent;
import jade.core.behaviours.CyclicBehaviour;
import jade.lang.acl.*;
import jade.domain.FIPANames;
import jade.content.ContentManager;
import jade.content.onto.Ontology;
import jade.content.onto.OntologyException;
import jade.content.onto.basic.*;
import jade.content.lang.Codec;
import jade.content.lang.Codec.CodecException;
import jade.content.lang.sl.SLCodec;
import jade.util.leap.List;
import jade.util.leap.ArrayList;
import java.lang.reflect.*;
import java.io.Serializable;
public class IntrospectionServer extends CyclicBehaviour {
private Codec codec;
private Ontology onto;
private MessageTemplate template;
private static Class serializableClass;
static {
try {
serializableClass = Class.forName("java.io.Serializable");
}
catch (Exception e) {
}
}
public IntrospectionServer(Agent a) {
super(a);
}
public void onStart() {
ContentManager cm = myAgent.getContentManager();
onto = IntrospectionOntology.getInstance();
cm.registerOntology(onto);
codec = cm.lookupLanguage(FIPANames.ContentLanguage.FIPA_SL);
if (codec == null) {
codec = cm.lookupLanguage(FIPANames.ContentLanguage.FIPA_SL2);
if (codec == null) {
codec = cm.lookupLanguage(FIPANames.ContentLanguage.FIPA_SL1);
if (codec == null) {
codec = cm.lookupLanguage(FIPANames.ContentLanguage.FIPA_SL0);
}
}
}
if (codec == null) {
codec = new SLCodec();
cm.registerLanguage(codec);
}
template = MessageTemplate.and(
MessageTemplate.MatchOntology(onto.getName()),
MessageTemplate.MatchPerformative(jade.lang.acl.ACLMessage.REQUEST) );
}
public void action() {
jade.lang.acl.ACLMessage request = myAgent.receive(template);
if (request != null) {
try {
ContentManager cm = myAgent.getContentManager();
Action actionExpr = (Action) cm.extractContent(request);
Object act = actionExpr.getAction();
if (act instanceof GetKeys) {
serveGetKeys(request, actionExpr, (GetKeys) act);
}
else if (act instanceof GetValue) {
serveGetValue(request, actionExpr, (GetValue) act);
}
else {
serveUnknownAction(request, actionExpr, act);
}
}
catch (OntologyException oe) {
reply(request, jade.lang.acl.ACLMessage.NOT_UNDERSTOOD);
oe.printStackTrace();
}
catch (CodecException ce) {
reply(request, jade.lang.acl.ACLMessage.NOT_UNDERSTOOD);
ce.printStackTrace();
}
catch (ValueEncodingException vee) {
jade.lang.acl.ACLMessage msg = request.createReply();
msg.setPerformative(jade.lang.acl.ACLMessage.FAILURE);
msg.setContent("VALUE_NOT_ENCODABLE");
myAgent.send(msg);
}
catch (Throwable t) {
reply(request, jade.lang.acl.ACLMessage.FAILURE);
t.printStackTrace();
}
}
else {
block();
}
}
protected void reply(jade.lang.acl.ACLMessage request, int performative) {
jade.lang.acl.ACLMessage msg = request.createReply();
msg.setPerformative(performative);
myAgent.send(msg);
}
protected void serveGetKeys(jade.lang.acl.ACLMessage request, Action aExpr, GetKeys action) throws Exception {
List keys = new ArrayList();
Method[] mm = myAgent.getClass().getMethods();
for (int i = 0; i < mm.length; ++i) {
Method method = mm[i];
if (method.getName().startsWith("get") && method.getParameterTypes().length == 0) {
Class retType = method.getReturnType();
if (retType.isPrimitive() || (serializableClass != null && serializableClass.isAssignableFrom(retType))) {
String key = method.getName().substring(3);
keys.add(key);
}
}
}
Result r = new Result(aExpr, keys);
jade.lang.acl.ACLMessage reply = request.createReply();
myAgent.getContentManager().fillContent(reply, r);
reply.setPerformative(jade.lang.acl.ACLMessage.INFORM);
myAgent.send(reply);
}
protected void serveGetValue(jade.lang.acl.ACLMessage request, Action aExpr, GetValue action) throws Exception {
Method method = myAgent.getClass().getMethod("get"+action.getKey(), new Class[]{});
Object value = method.invoke(myAgent, (Object[]) null);
if (value == null) {
value = "null";
}
Result r = new Result(aExpr, value);
jade.lang.acl.ACLMessage reply = request.createReply();
try {
myAgent.getContentManager().fillContent(reply, r);
reply.setPerformative(jade.lang.acl.ACLMessage.INFORM);
myAgent.send(reply);
}
catch (OntologyException oe) {
throw new ValueEncodingException();
}
catch (CodecException ce) {
throw new ValueEncodingException();
}
}
protected void serveUnknownAction(jade.lang.acl.ACLMessage request, Action aExpr, Object action) {
reply(request, jade.lang.acl.ACLMessage.REFUSE);
}
private class ValueEncodingException extends Exception {
}
}