private boolean initializeProxy(CacheClientProxy l_proxy) throws CacheException {
    if (!isProxyInInitializationMode(l_proxy)) {
      if (logger.isDebugEnabled()) {
        logger.debug("Initializing proxy: {}", l_proxy);
      }
      try {
        // Add client proxy to initialization list. This has to be done before
        // the queue is created so that events can be buffered here for delivery
        // to the queue once it's initialized (bug #41681 and others)
        addClientInitProxy(l_proxy);
        l_proxy.initializeMessageDispatcher();
        // Initialization success. Add to client proxy list.
        addClientProxy(l_proxy);
        return true;
      } catch (RegionExistsException ree) {
        if (logger.isDebugEnabled()) {
          String name = ree.getRegion() != null ? ree.getRegion().getFullPath() : "null region";
          logger.debug("Found RegionExistsException while initializing proxy. Region name: {}",
              name);
        }
        // This will return false;
      } finally {
        removeClientInitProxy(l_proxy);
      }
    }
    return false;
  }
Continues the registration of a new client that wants to receive updates with this server.

@param clientRegistrationMetadata Contains registration info pertaining to the client
@param socket The socket over which the server communicates with the client.
@param isPrimary Whether server is the primary subscription end point for this client
@param acceptorId ID of the acceptor used to clean up the client connection
@param notifyBySubscription Whether the Server is running in NotifyBySubscription mode
@throws IOException Can occur if there are issues communicating over the socket
@throws CacheException A generic exception, which indicates a cache error has occurred.
@throws ClassNotFoundException Thrown when the ClientProxyMembershipID class is not found
@throws NoSuchMethodException Potentially thrown by performPostAuthorization
@throws InvocationTargetException Potentially thrown by performPostAuthorization
@throws IllegalAccessException Potentially thrown by performPostAuthorization
geode-core/src/main/java/org/apache/geode/internal/cache/tier/sockets/CacheClientNotifier.java