Examples of net.jini.core.lookup.ServiceRegistrar

net.jini.core.lookup.ServiceRegistrar
Defines the interface to the lookup service. The interface is not a remote interface; each implementation of the lookup service exports proxy objects that implement the ServiceRegistrar interface local to the client, using an implementation-specific protocol to communicate with the actual remote server. All of the proxy methods obey normal RMI remote interface semantics except where explicitly noted. Two proxy objects are equal if they are proxies for the same lookup service. Every method invocation (on both ServiceRegistrar and ServiceRegistration) is atomic with respect to other invocations. @author Sun Microsystems, Inc. @see ServiceRegistration @since 1.0

     */
    private void updateGroupsInGlobalSet(Map groupsMap) {
        Set eSet = groupsMap.entrySet();
        for(Iterator itr = eSet.iterator(); itr.hasNext(); ) {
            Map.Entry pair = (Map.Entry)itr.next();
            ServiceRegistrar reg = (ServiceRegistrar)pair.getKey();
            if(allDiscoveredRegs.containsKey(reg)) {
                LookupLocator loc
                  = ((LocatorGroupsStruct)allDiscoveredRegs.get(reg)).locator;
                String[] newGroups = (String[])pair.getValue();
                LocatorGroupsStruct locGroups

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            HashMap regMapOut = new HashMap(regMapIn.size());
            Iterator itr = (regMapIn.entrySet()).iterator();
            nextReg:
            for(int i=0;itr.hasNext();i++) {
                Map.Entry pair = (Map.Entry)itr.next();
                ServiceRegistrar reg = (ServiceRegistrar)pair.getKey();
                /* If reg is already in map, go to next registrar */
                if( discoveredRegsMap.containsKey(reg) ) continue nextReg;
                /* It doesn't contain it, try to marshal it */
                MarshalledObject mReg = null;
                try {

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         * unicast response here because, prior to modification and storage
         * in the managed set of registrars in this method, it is assumed that
         * that object is not accessed by any other thread.
         */
        try {
      final ServiceRegistrar srcReg = resp.getRegistrar();
            ServiceRegistrar prepReg
    = (ServiceRegistrar)AccessController.doPrivileged
        ( securityContext.wrap( new PrivilegedExceptionAction() {
                        public Object run() throws RemoteException {
                            Object proxy = registrarPreparer.prepareProxy
                                                            (srcReg);

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     *                  member groups of the registrar corresponding to the 
     *                  <code>response</code> parameter (just after a
     *                  possible change)
     */
    private void maybeSendEvent(UnicastResponse response, String[] newGroups) {
        ServiceRegistrar reg = response.getRegistrar();
        boolean getActual    = true;
        if(newGroups == null) { // newGroups null means get actual groups now
            newGroups = getActualGroups(reg);
            if(newGroups == null) return; // if null, then it was discarded
            getActual = false;
        }//endif


        if(groupSetsEqual(response.getGroups(),newGroups)) return;


        String[] actualGroups = newGroups;
        if( getActual && (newGroups.length > 0) ) {
            actualGroups = getActualGroups(reg);
            if(actualGroups == null) return; // null ==> was already discarded
        }//endif
  
  synchronized (registrars) {
      // Other events may have occured to registrars while we were
      // making our remote call.
      UnicastResponse resp =
    (UnicastResponse) registrars.get(reg.getServiceID());
      if (resp == null) {
    // The registrar was discarded in the meantime. Oh well.
    return;
      }
      notifyOnGroupChange(reg, resp.getGroups(), actualGroups);

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  }
  int len = proxys.length;
  if(len == 0 ) return null;
  int rand = Math.abs(random.nextInt()) % len;
  for(int i=0; i<len; i++) {
      ServiceRegistrar proxy = proxys[(i + rand) % len];
      ServiceItem sItem = null;
      try {
                int maxMatches = ( (filter != null) ? Integer.MAX_VALUE : 1 );
    ServiceMatches sm = proxy.lookup(tmpl, maxMatches);
    sItem = getMatchedServiceItem(sm, filter);
      } catch(Exception e) {
                logger.log(Level.INFO,
                           "Exception occurred during query, discarding proxy",
                           e);

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  if(len > 0) {
            /* loop thru the set of lookups, randomly selecting each lookup */
      int rand = (Math.abs(random.nextInt())) % len;
      for(int i=0; i<len; i++) {
                int max = maxMatches;
    ServiceRegistrar proxy = proxys[(i + rand) % len];
    try {
                    /* If a filter is to be applied (filter != null), then
                     * the value of the maxMatches parameter will not 
                     * suffice when querying the current lookup service.
                     * This is because although services returned from a
                     * query of the lookup service will match the template,
                     * some of those services may get filtered out. Thus,
                     * asking for exactly maxMatches may result in fewer
                     * matching services than actually are contained in
                     * the lookup. Thus, all matching services are 
                     * requested by passing in "infinity" for the maximum
                     * number of matches (Integer.MAX_VALUE).
                     */
                    if(filter != null) max = Integer.MAX_VALUE;
                    /* Query the current lookup for matching service(s). */
        ServiceMatches sm = proxy.lookup(tmpl, max);
        int nItems = sm.items.length;
        if(nItems == 0) continue;//no matches, query next lookup
                    /* Loop thru the matching services, randomly selecting
                     * each service, applying the filter if appropriate,
                     * and making sure the service has not already been

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                super(reg, seqN);
                this.eReg = eReg;
      }
            public void run() {
                logger.finest("ServiceDiscoveryManager - LookupTask started");
    ServiceRegistrar proxy = reg.proxy;
    ServiceMatches matches;
                /* For the given lookup, get all services matching the tmpl */
    try {
        matches = proxy.lookup(tmpl, Integer.MAX_VALUE);
    } catch (Exception e) {
                    boolean cacheTerminated;
                    synchronized(serviceIdMap) {
                        eReg.lookupsPending--;
                        cacheTerminated = bCacheTerminated;

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      // read LUS proxy
      ObjectInputStream oin = new ObjectInputStream(
    new BufferedInputStream(socket.getInputStream()));
      MarshalledInstance mi = 
    new MarshalledInstance((MarshalledObject) oin.readObject());
      ServiceRegistrar reg = 
    (ServiceRegistrar) mi.get(defaultLoader, false, null, context);


      // read LUS member groups
      int ngroups = oin.readInt();
      if (ngroups < 0) {

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     */
    public void discovered(DiscoveryEvent evt) {
        ServiceRegistrar[] registrars = evt.getRegistrars();


        for (int n = 0; n < registrars.length; n++) {
            ServiceRegistrar registrar = registrars[n];


            try {
                System.out.println("Found a service locator at "
                        + registrar.getLocator().getHost());
            } catch (RemoteException e) {
                KernelException.stackTraceToString(e);
            }
        }
    }

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        // Name sn = new Name("*");
        ServiceTemplate tmpl = new ServiceTemplate(null, classes, new Entry[] {});


        // Creating a lookup locator
        LookupLocator locator = new LookupLocator(uri);
        ServiceRegistrar sr = locator.getRegistrar();


        TransactionManager tm = (TransactionManager) sr.lookup(tmpl);
        return tm;
    }

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