/**
* {@inheritDoc}
*
* @param raw Description of the Parameter
* @return Description of the Return Value
*/
protected boolean handleElement(Element raw) {
if (super.handleElement(raw)) {
return true;
}
XMLElement elem = (XMLElement) raw;
if (DEST_PID_TAG.equals(elem.getName())) {
try {
URI pID = new URI(elem.getTextValue());
setDestPeerID((PeerID) IDFactory.fromURI(pID));
} catch (URISyntaxException badID) {
throw new IllegalArgumentException("Bad PeerID in advertisement");
} catch (ClassCastException badID) {
throw new IllegalArgumentException("ID in advertisement is not a peer id");
}
return true;
}
if (elem.getName().equals("Dst")) {
for (Enumeration eachXpt = elem.getChildren(); eachXpt.hasMoreElements(); ) {
TextElement aXpt = (TextElement) eachXpt.nextElement();
AccessPointAdvertisement xptAdv =
(AccessPointAdvertisement) AdvertisementFactory.newAdvertisement(aXpt);
setDest(xptAdv);
}
return true;
}
if (elem.getName().equals("Hops")) {
Vector hops = new Vector();
for (Enumeration eachXpt = elem.getChildren(); eachXpt.hasMoreElements(); ) {
TextElement aXpt = (TextElement) eachXpt.nextElement();
AccessPointAdvertisement xptAdv =
(AccessPointAdvertisement) AdvertisementFactory.newAdvertisement(aXpt);
hops.addElement(xptAdv);
}
setHops(hops);
return true;
}
return false;
}
/**
* Use this form for a fully populated advert.
*
* @param msid -- the module spec id, "urn:jxta:uuid-[the big hex string]"
* @param moduleSpecName -- something like "JXTASPEC:JXTA-WIRE-MyNewThing-SPEC"
* @param moduleSpecDescription -- something like "JXTA-WIRE MyNewThing Specification"
* @param creator -- something like "jxta.org"
* @param version -- something like "Version 2.0"
* @param specURI -- where to locate the formal specs, e.g. "http://www.jxta.org/MyNewThing"
* @param pipeAdv -- to make the module useable remotely (see {@link ModuleSpecAdvertisement})
* @param proxySpecID -- sometimes required for remote use (see {@link ModuleSpecAdvertisement})
* @param authorizationSpecID -- sometimes required for remote use (see {@link
* ModuleSpecAdvertisement})
* @param param -- anything else
* @return -- a fully populated advert specifying remote access to module services.
*/
public static ModuleSpecAdvertisement buildModuleSpecAdvertisement(
ModuleSpecID msid,
String moduleSpecName,
String moduleSpecDescription,
String creator,
String version,
String specURI,
PipeAdvertisement pipeAdv,
ModuleSpecID proxySpecID,
ModuleSpecID authorizationSpecID,
StructuredDocument param) {
ModuleSpecAdvertisement msadv =
(ModuleSpecAdvertisement)
AdvertisementFactory.newAdvertisement(ModuleSpecAdvertisement.getAdvertisementType());
msadv.setModuleSpecID(msid);
msadv.setName(moduleSpecName);
msadv.setDescription(moduleSpecDescription);
msadv.setCreator(creator == null ? "jxta.org" : creator);
msadv.setVersion(version == null ? "Version 2.0" : version);
msadv.setSpecURI(specURI == null ? "http://www.jxta.org/" + moduleSpecName : specURI);
if (pipeAdv != null) {
msadv.setPipeAdvertisement(pipeAdv);
}
if (proxySpecID != null) {
msadv.setProxySpecID(proxySpecID);
}
if (authorizationSpecID != null) {
msadv.setAuthSpecID(authorizationSpecID);
}
if (param != null) {
msadv.setParam(param);
}
return msadv;
}
/**
* Gets the pipeAdvertisement attribute of the PipeResolverMessage object
*
* @return The pipeAdvertisement value
*/
public PipeAdvertisement getPipeAdvertisement() {
if (pipeAdv == null && (getPipeID().equals(ID.nullID) && getPipeType() != null)) {
pipeAdv =
(PipeAdvertisement)
AdvertisementFactory.newAdvertisement(PipeAdvertisement.getAdvertisementType());
pipeAdv.setPipeID(getPipeID());
pipeAdv.setType(getPipeType());
}
return pipeAdv;
}
/**
* The module class advertisement is to simply advertise the existence of a module.
*
* @param mcid -- the module class id
* @param serviceName -- something like "JXTAMOD:JXTA-WIRE-MyNewThing"
* @param serviceDescription -- something like "JXTA-WIRE MyNewThing Module"
* @return an appropriate ModuleClassAdvertisement
*/
public static ModuleClassAdvertisement buildModuleClassAdvertisement(
ModuleClassID mcid, String serviceName, String serviceDescription) {
ModuleClassAdvertisement mcadv =
(ModuleClassAdvertisement)
AdvertisementFactory.newAdvertisement(ModuleClassAdvertisement.getAdvertisementType());
mcadv.setName(serviceName);
mcadv.setDescription(serviceDescription);
mcadv.setModuleClassID(mcid);
return mcadv;
}
/**
* A ModuleImplAdvertisement represents one of any number of published implementations of a given
* specification. Use this form with for a development boilerplate. Use buildCompat() for a compat
* boilerplate. (See {@link ModuleImplAdvertisement}.)
*
* @param msid -- the module spec id
* @param code -- the module's fully qualified classname, "net.jxta.impl.wire.MyNewThing"
* @param compat -- a compatibility statement. Use buildCompat() for a boilerplate.
* @return -- a development boilerplate with custom compatibility.
*/
public static ModuleImplAdvertisement buildModuleImplAdvertisement(
ModuleSpecID msid, String code, Element compat) {
ModuleImplAdvertisement miadv =
(ModuleImplAdvertisement)
AdvertisementFactory.newAdvertisement(ModuleImplAdvertisement.getAdvertisementType());
miadv.setCompat(compat);
miadv.setModuleSpecID(msid);
miadv.setCode(code);
miadv.setDescription(code + " Module, J2SE Implementation");
miadv.setProvider("jxta.org");
miadv.setUri("http://download.jxta.org");
return miadv;
}
/**
* Process an individual element from the document during parse. Normally, implementations will
* allow the base advertisments a chance to handle the element before attempting ot handle the
* element themselves. ie.
*
* <p>
*
* <p>
*
* <pre><code>
* protected boolean handleElement(Element elem) {
* <p/>
* if (super.handleElement()) {
* // it's been handled.
* return true;
* }
* <p/>
* <i>... handle elements here ...</i>
* <p/>
* // we don't know how to handle the element
* return false;
* }
* </code></pre>
*
* @param elem the element to be processed.
* @return true if the element was recognized, otherwise false.
*/
protected boolean handleElement(XMLElement elem) {
String value = elem.getTextValue();
if (null == value) {
return false;
}
value = value.trim();
if (0 == value.length()) {
return false;
}
if (elem.getName().equals(typeTag)) {
setDiscoveryType(Integer.parseInt(value));
return true;
}
if (elem.getName().equals(thresholdTag)) {
setThreshold(Integer.parseInt(value));
return true;
}
if (elem.getName().equals(peerAdvTag)) {
try {
XMLDocument asDoc =
(XMLDocument)
StructuredDocumentFactory.newStructuredDocument(
MimeMediaType.XMLUTF8, new StringReader(value));
PeerAdvertisement adv = (PeerAdvertisement) AdvertisementFactory.newAdvertisement(asDoc);
setPeerAdvertisement(adv);
return true;
} catch (IOException failed) {
IllegalArgumentException failure = new IllegalArgumentException("Bad Peer Advertisement");
failure.initCause(failed);
throw failure;
}
}
if (elem.getName().equals(queryAttrTag)) {
setAttr(value);
return true;
}
if (elem.getName().equals(queryValueTag)) {
setValue(value);
return true;
}
// element was not handled
return false;
}
/**
* Process the Query, and generate response
*
* @param query the query to process
*/
public int processQuery(ResolverQueryMsg query) {
if (!useRouteResolver) { // Route resolver disabled
return ResolverService.OK;
}
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("processQuery starts");
}
RouteQuery routeQuery = null;
Reader ip = null;
try {
ip = new StringReader(query.getQuery());
StructuredTextDocument asDoc =
(StructuredTextDocument)
StructuredDocumentFactory.newStructuredDocument(MimeMediaType.XMLUTF8, ip);
routeQuery = new RouteQuery(asDoc);
} catch (Throwable e) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("Malformed Route query ", e);
}
return ResolverService.OK;
} finally {
try {
if (null != ip) {
ip.close();
ip = null;
}
} catch (Throwable ignored) {;
}
}
PeerID pId = routeQuery.getDestPeerID();
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("processQuery: looking for route to " + pId);
}
RouteAdvertisement srcRoute = routeQuery.getSrcRoute();
List badHops = routeQuery.getBadHops();
if (LOG.isEnabledFor(Level.DEBUG)) {
if (badHops != null) {
LOG.debug("processQuery: bad Hops");
for (int i = 0; i < badHops.size(); i++) {
LOG.debug("processQuery: :" + ((PeerID) badHops.get(i)).toString());
}
}
}
// if our source route is not null, then publish it
if (srcRoute != null) {
if (!(srcRoute.getDestPeerID()).equals(localPeerId)) {
// This is not our own peer adv so we must not keep it
// longer than its expiration time.
try {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("processQuery: publishing sender route info " + srcRoute.getDestPeerID());
}
// we only need to publish this route if
// we don't know about it yet
// XXX: here is where we could be more conservative and use isNormallyReachable() instead,
// thus excluding
// incoming messengers.
if ((!router.isLocalRoute(router.pid2addr(srcRoute.getDestPeerID())))
&& (!router.isRoutedRoute(router.pid2addr(srcRoute.getDestPeerID())))) {
routeCM.publishRoute(srcRoute);
}
} catch (Exception e) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("Could not publish Route Adv from query - discard", e);
}
return ResolverService.OK;
}
}
} else {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("No src Route in route query - discard ");
}
return ResolverService.OK;
}
if (pId == null) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("Malformed route query request, no PeerId - discard");
}
return ResolverService.OK;
}
// We have more luck with that one because, since it is part of OUR
// message, and not part of the resolver protocol, it is in OUR
// format.
EndpointAddress qReqAddr = router.pid2addr(pId);
RouteAdvertisement route = null;
// check if this peer has a route to the destination
// requested
boolean found = false;
if (qReqAddr.equals(localPeerAddr)) {
found = true;
// return the route that is my local route
route = router.getMyLocalRoute();
} else {
// only rendezvous can respond to route requests
// if not we are generating too much traffic
// XXX: here is where we could be more conservative and use isNormallyReachable() instead,
// thus excluding
// incoming messengers.
if (router.isLocalRoute(qReqAddr)) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("processQuery: peer has direct route to destination ");
}
// we should set the route to something :-)
found = true;
// this peer has a direct route to the destination
// return the short route advertisement we know for this peer
// (For us it is zero hop, and we advertise ourself as the routing
// peer in the response. The stiching is done by whoever gets that
// response). May be there are more than one hop advertised in-there...
// alternate routing peers...should we leave them ?
// For now, we keep the full dest, but wack the hops.
route =
(RouteAdvertisement)
AdvertisementFactory.newAdvertisement(RouteAdvertisement.getAdvertisementType());
AccessPointAdvertisement ap =
(AccessPointAdvertisement)
AdvertisementFactory.newAdvertisement(
AccessPointAdvertisement.getAdvertisementType());
ap.setPeerID(pId);
route.setDest(ap);
} else {
route = router.getRoute(qReqAddr, false);
if (route != null) {
found = true;
// check if we were given some bad hops info
// and see if the found route contains
// any of these bad hops. In that case, we need
// to mark this route as bad
for (int i = 0; i < badHops.size(); i++) {
// destination is known to be bad
if (router.addr2pid(qReqAddr).equals(((PeerID) badHops.get(i)))) {
processBadRoute((PeerID) badHops.get(i), route);
found = false;
break;
}
if (route.containsHop((PeerID) badHops.get(i))) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug(
"processQuery: peer has bad route due to "
+ ((PeerID) badHops.get(i)).toString());
}
processBadRoute((PeerID) badHops.get(i), route);
found = false;
break;
}
}
}
}
}
if (!found) {
// discard the request if we are not a rendezvous
// else forward to the next peers
if (!group.isRendezvous()) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("discard query forwarding as not a rendezvous");
}
return ResolverService.OK;
}
// did not find a route, check our srdi cache
// make sure we protect against out of sync
// SRDI index
// srdi forwarding is only involved once the Index entry has
// been found and we forwarded the resolver query. Afterward a
// normal walk proceeds from the initial SRDI index pointing
// rdv. This is done to protect against potential loopback
// entries in the SRDI cache index due to out of sync peerview
// and index.
if (query.getHopCount() < 2) {
// check local SRDI cache to see if we have the entry
// we look for 10 entries, will pickup one randomly
Vector results = srdiIndex.query("route", "DstPID", pId.toString(), 10);
if (results.size() > 0) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("processQuery srdiIndex lookup match :" + results.size());
}
// remove any non-rdv peers to avoid sending
// to a non-rdv peers and garbage collect the SRDI
// index in the process
Vector clean = cleanupAnyEdges(query.getSrc(), results);
if (clean.size() > 0) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("found an srdi entry forwarding query to SRDI peer");
}
// The purpose of incrementing the hopcount
// when an SRDI index match is found (we got a
// pointer to a rdv that should have the route) is to
// restrict any further forwarding. The increment
// count is only done when a matching SRDI index is
// found. Not when the replica is selected as we
// still need to forward the query. This restriction
// is purposelly done to avoid too many longjumps
// within a walk.
query.incrementHopCount();
// Note: this forwards the query to 1 peer randomly
// selected from the result
srdi.forwardQuery(clean, query, 1);
// tell the resolver no further action is needed.
return ResolverService.OK;
}
}
}
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("did not find a route or SRDI index");
}
// force a walk
return ResolverService.Repropagate;
}
// we found a route send the response
try {
if (route == null) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("we should have had a route at this point");
}
return ResolverService.OK;
}
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("processQuery: we have a route build route response" + route.display());
}
RouteAdvertisement myRoute = router.getMyLocalRoute();
// make sure we initialized our local
// route info as we will need it to respond. We may
// not have our route if we are still
// waiting for a relay connection.
if (myRoute == null) {
return ResolverService.OK;
}
RouteResponse routeResponse = new RouteResponse();
routeResponse.setDestRoute(route);
routeResponse.setSrcRoute(myRoute);
if (routeResponse == null) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("error creating route response");
}
return ResolverService.OK;
}
// construct a response from the query
ResolverResponseMsg res = query.makeResponse();
res.setCredential(credentialDoc);
res.setResponse(routeResponse.toString());
resolver.sendResponse(query.getSrc(), res);
return ResolverService.OK;
} catch (Exception ee) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("processQuery: error while processing query ", ee);
}
return ResolverService.OK;
}
}
/**
* Return a route error in case a route was found to be invalid as the current hop cannot find a
* way to forward the message to the destination or any other hops in the forward part of the
* route. In that case a negative route response is forwarded to the orginal source of the
* message. Now of course we do not have any way to guarantee that the NACK message will be
* received by the sender, but the best we can do is to try :-)
*
* <p>we send a query ID to NACKROUTE_QUERYID to indicate this is a bad Route
*
* @param src original source of the message
* @param dest original destination of the message
*/
protected void generateNACKRoute(PeerID src, PeerID dest, Vector origHops) {
// As long as the group is partially initialized, do not bother
// trying to send NACKS. We can't: it just causes NPEs.
if (resolver == null) {
return;
}
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("generate NACK Route response " + src);
}
// check first, if we are not already in process of looking for a
// route to the destination peer of the NACK. We should not try to
// send a NACK to that destination at that point as this will block
// our incoming processing thread while it is looking for a route to
// that destination. If there a no pending route requests to that
// destination then we can go ahead an attempt to send the NACK. At
// the maximum we should have only one thread block while looking for
// a specific destination. When we find a route to the destination,
// the next NACK processing will be sent.
if (router.isPendingRouteQuery(router.pid2addr(src))) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("drop NACK due to pending route discovery " + src);
}
return;
}
// Generate a route response
RouteAdvertisement route =
(RouteAdvertisement)
AdvertisementFactory.newAdvertisement(RouteAdvertisement.getAdvertisementType());
AccessPointAdvertisement ap =
(AccessPointAdvertisement)
AdvertisementFactory.newAdvertisement(AccessPointAdvertisement.getAdvertisementType());
ap.setPeerID(dest);
route.setDest(ap);
route.setHops(origHops);
// set the the route of the peer that
// detected the bad route
RouteAdvertisement routeSrc =
(RouteAdvertisement)
AdvertisementFactory.newAdvertisement(RouteAdvertisement.getAdvertisementType());
AccessPointAdvertisement apSrc =
(AccessPointAdvertisement)
AdvertisementFactory.newAdvertisement(AccessPointAdvertisement.getAdvertisementType());
apSrc.setPeerID((PeerID) localPeerId);
routeSrc.setDest(apSrc);
RouteResponse routeResponse = new RouteResponse();
routeResponse.setDestRoute(route);
routeResponse.setSrcRoute(routeSrc);
if (routeResponse == null) {
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("error creating route NACKresponse");
}
return;
}
ResolverResponse res =
new ResolverResponse(
routerSName,
credentialDoc,
NACKROUTE_QUERYID, // mean NACKRoute
routeResponse.toString());
// send the NACK response back to the originator
resolver.sendResponse(src.toString(), res);
}
private void initialize(Element root) {
if (!TextElement.class.isInstance(root))
throw new IllegalArgumentException(getClass().getName() + " only supports TextElement");
TextElement doc = (TextElement) root;
if (!doc.getName().equals(paramTag))
throw new IllegalArgumentException(
"Could not construct : "
+ getClass().getName()
+ "from doc containing a "
+ doc.getName());
// set defaults
servicesTable = new Hashtable();
protosTable = new Hashtable();
appsTable = new Hashtable();
int appCount = 0;
Enumeration modules = doc.getChildren();
while (modules.hasMoreElements()) {
Hashtable theTable;
TextElement module = (TextElement) modules.nextElement();
String tagName = module.getName();
if (tagName.equals(svcTag)) {
theTable = servicesTable;
} else if (tagName.equals(appTag)) {
theTable = appsTable;
} else if (tagName.equals(protoTag)) {
theTable = protosTable;
} else continue;
ModuleSpecID specID = null;
ModuleClassID classID = null;
ModuleImplAdvertisement inLineAdv = null;
try {
if (module.getTextValue() != null) {
specID = (ModuleSpecID) IDFactory.fromURL(IDFactory.jxtaURL(module.getTextValue()));
}
// Check for children anyway.
Enumeration fields = module.getChildren();
while (fields.hasMoreElements()) {
TextElement field = (TextElement) fields.nextElement();
if (field.getName().equals(mcidTag)) {
classID = (ModuleClassID) IDFactory.fromURL(IDFactory.jxtaURL(field.getTextValue()));
continue;
}
if (field.getName().equals(msidTag)) {
specID = (ModuleSpecID) IDFactory.fromURL(IDFactory.jxtaURL(field.getTextValue()));
continue;
}
if (field.getName().equals(miaTag)) {
inLineAdv = (ModuleImplAdvertisement) AdvertisementFactory.newAdvertisement(field);
continue;
}
}
} catch (Exception any) {
if (LOG.isEnabledFor(Level.WARN)) LOG.warn("Broken entry; skipping", any);
continue;
}
if (inLineAdv == null && specID == null) {
if (LOG.isEnabledFor(Level.WARN)) LOG.warn("Insufficent entry; skipping");
continue;
}
Object theValue;
if (inLineAdv == null) {
theValue = specID;
} else {
specID = inLineAdv.getModuleSpecID();
theValue = inLineAdv;
}
if (classID == null) {
classID = specID.getBaseClass();
}
// For applications, the role does not matter. We just create
// a unique role ID on the fly.
// When outputing the add we get rid of it to save space.
if (theTable == appsTable) {
// Only the first (or only) one may use the base class.
if (appCount++ != 0) {
classID = IDFactory.newModuleClassID(classID);
}
}
theTable.put(classID, theValue);
}
}
/**
* {@inheritDoc}
*
* @param encodeAs Description of the Parameter
* @return The document value
*/
public Document getDocument(MimeMediaType encodeAs) {
StructuredDocument adv = (StructuredDocument) super.getDocument(encodeAs);
if (hasALoop()) {
throw new IllegalStateException("I won't write a doc for a route with a loop");
}
PeerID pid = getDestPeerID();
AccessPointAdvertisement dest = getDest();
if ((null != pid) && (null != dest) && (null != dest.getPeerID())) {
if (!pid.equals(dest.getPeerID())) {
throw new IllegalStateException(
"Destination peer id and destination access point adv don't refer to the same peer");
}
}
// HACK Backwards Compatibility
if ((null == pid) && (null != dest)) {
pid = dest.getPeerID();
}
if (pid != null) {
Element e0 = adv.createElement(DEST_PID_TAG, pid.toString());
adv.appendChild(e0);
}
if (dest != null) {
// create the copy without the PID
AccessPointAdvertisement ap =
(AccessPointAdvertisement)
AdvertisementFactory.newAdvertisement(
AccessPointAdvertisement.getAdvertisementType());
ap.setEndpointAddresses(dest.getVectorEndpointAddresses());
StructuredTextDocument xptDoc = (StructuredTextDocument) ap.getDocument(encodeAs);
Element e1 = adv.createElement("Dst");
adv.appendChild(e1);
StructuredDocumentUtils.copyElements(adv, e1, xptDoc);
}
// only include hops if we have some
if (getHops().hasMoreElements()) {
Element e2 = adv.createElement("Hops");
adv.appendChild(e2);
for (Enumeration e = getHops(); e.hasMoreElements(); ) {
AccessPointAdvertisement hop = (AccessPointAdvertisement) e.nextElement();
if (hop != null) {
StructuredTextDocument xptDoc = (StructuredTextDocument) hop.getDocument(encodeAs);
StructuredDocumentUtils.copyElements(adv, e2, xptDoc);
}
}
}
return adv;
}
/** @see net.jxta.discovery.DiscoveryListener#discoveryEvent(DiscoveryEvent) */
public void discoveryEvent(DiscoveryEvent event) {
// copied from JXTA Examples - PeerDiscovery
System.out.println("Process discovery event...");
DiscoveryResponseMsg response = event.getResponse();
// Get the responding peer's advertisement as a string
String responderAdvString = response.getPeerAdv();
InputStream is = null;
try {
// create a peer advertisement
is = new ByteArrayInputStream(responderAdvString.getBytes());
PeerAdvertisement responderAdv =
(PeerAdvertisement) AdvertisementFactory.newAdvertisement(XML_MIME_TYPE, is);
System.out.println(
" [ Got a Discovery Response ["
+ response.getResponseCount()
+ " elements] from peer: "
+ responderAdv.getName()
+ " ]");
} catch (java.io.IOException e) {
// bogus peer, skip this message alltogether.
System.out.println("Warning: cannot parse remote peer's advertisement.\n" + e.getMessage());
return;
} finally {
if (is != null) {
try {
is.close();
} catch (Throwable throwable) {
System.out.println(
"Ignoring failure to close stream " + "on remote peer's advertisement");
throwable.printStackTrace();
}
}
}
// now print out each discovered peer
PeerAdvertisement newAdv = null;
Enumeration responses = response.getResponses();
while (responses.hasMoreElements()) {
try {
String responseString = (String) responses.nextElement();
// create an advertisement object from each element
newAdv =
(PeerAdvertisement)
AdvertisementFactory.newAdvertisement(
XML_MIME_TYPE, new ByteArrayInputStream(responseString.getBytes()));
System.out.println(" Peer name = " + newAdv.getName());
} catch (java.io.IOException e) {
// got a bad response. continue to the next response
System.out.println("Warning: cannot parse response element.\n" + e.getMessage());
continue;
}
} // end while
}
///////////////////////////////////////////////////////////////////
//// public methods ////
public void preinitialize() throws IllegalActionException {
super.preinitialize();
PropertyConfigurator.configure(System.getProperties());
// if (configDir.hasToken()) {
// String Dir = ((StringToken)configDir.getToken()).stringValue();
// } else {
String Dir = "c:/Cygwin/home/ellen_zh/ptII/ptolemy/actor/lib/jxta";
// }
// if (actorList.hasToken()) {
// String _actorListFileName = ((StringToken)actorList.getToken()).stringValue();
// } else {
String _actorListFileName = "c:/Cygwin/home/ellen_zh/ptII/ptolemy/actor/lib/jxta/actors.xml";
// }
_properties = new Properties(System.getProperties());
InputStream configProperties = null;
try {
configProperties = new FileInputStream(_CONFIG_FILE);
_properties.load(configProperties);
} catch (IOException e) {
System.out.println(
"Warning: Can't find configuration propertiees file. ' " + e.getMessage() + "'");
} finally {
if (configProperties != null) {
try {
configProperties.close();
} catch (Throwable throwable) {
System.out.println("Ignoring failure to close stream " + "on '" + _CONFIG_FILE + "'");
throwable.printStackTrace();
}
}
}
PeerGroup netPeerGroup = null;
try {
netPeerGroup = PeerGroupFactory.newNetPeerGroup();
} catch (PeerGroupException ex) {
System.out.println("Error: cannot locate net peer group.\n" + ex.getMessage());
}
// load the peer group adv for actor exchange
String groupAdvFileName = _properties.getProperty("GroupAdvFileName");
if (groupAdvFileName == null) {
System.out.println("Error: property undefined - GroupAdvFileName.\n");
}
PeerGroupAdvertisement groupAdv = null;
try {
groupAdv =
(PeerGroupAdvertisement)
AdvertisementFactory.newAdvertisement(
XML_MIME_TYPE, new FileInputStream(Dir + "/" + groupAdvFileName));
} catch (FileNotFoundException ex) {
System.out.println("Error: cannot find group adv file.\n" + ex.getMessage());
} catch (IOException ex) {
System.out.println("Error: reading group adv file.\n" + ex.getMessage());
}
System.out.println("peer groupAdv: " + groupAdvFileName);
System.out.println("success before instantiate peer group");
// instantiate the peer group for actor exchange
try {
_group = netPeerGroup.newGroup(groupAdv);
} catch (PeerGroupException ex) {
System.out.println("Error: cannot instantiate peer group.\n" + ex.getMessage());
}
// join the peer group for actor exchange
// no authentication is done here
// modeled after JoinDemo from JXTA Examples
StructuredDocument identityInfo = null;
try {
AuthenticationCredential authCred = new AuthenticationCredential(_group, null, identityInfo);
MembershipService membershipService = _group.getMembershipService();
_authenticator = membershipService.apply(authCred);
if (_authenticator.isReadyForJoin()) {
_credential = membershipService.join(_authenticator);
System.out.println("Info: join group successful.");
_credential.getDocument(XML_MIME_TYPE).sendToStream(System.out);
} else {
System.out.println("Error: unable to join group.");
}
} catch (Exception ex) {
System.out.println("Error: failure in authentication.\n" + ex.getMessage());
}
_discoveryService = _group.getDiscoveryService();
_discoveryService.addDiscoveryListener(this);
_resolverService = _group.getResolverService();
// register this as a query handler
_resolverService.registerHandler(_ACTOR_QUERY_HANDLER_NAME, this);
// construct the actor query message
StringBuffer queryTextBuffer = new StringBuffer("<?xml version=\"1.0\"?>\n\n");
queryTextBuffer = queryTextBuffer.append("<ActorQuery>\n");
queryTextBuffer = queryTextBuffer.append("What actors do you have?");
queryTextBuffer = queryTextBuffer.append("\n</ActorQuery>\n");
_actorQueryMessage =
new ResolverQuery(_ACTOR_QUERY_HANDLER_NAME, null, null, queryTextBuffer.toString(), 0);
_actorQueryMessage.setSrc(_group.getPeerID().toString());
// construct the actor query response message
if (_actorListFileName != null) {
StringBuffer actorListText = new StringBuffer();
BufferedReader fileReader = null;
try {
fileReader = new BufferedReader(new FileReader(_actorListFileName));
String newline = System.getProperty("line.separator");
while (true) {
String line = fileReader.readLine();
if (line == null) {
break;
}
actorListText = actorListText.append(line);
actorListText = actorListText.append(newline);
}
_actorQueryResponse =
new ResolverResponse(_ACTOR_QUERY_HANDLER_NAME, null, 0, actorListText.toString());
} catch (IOException ex) {
System.out.println("Warning: error reading actor list file.\n" + ex.getMessage());
} finally {
if (fileReader != null) {
try {
fileReader.close();
} catch (Exception ex) {
System.out.println("Failed to close: " + ex.getMessage());
}
}
}
}
}
