public ClientCacheFactory addPoolServer(String host, int port) {
    getPoolFactory().addServer(host, port);
    return this;
  }
Add a server, given its host and port, to this factory. The server must be a cache server and
this client will directly connect to without consulting a server locator. Note that if the host
is unknown at the time of this call the server will still be added. When the pool is used for
an operation if the host is still unknown an exception will be thrown.

@param host the host name or ip address that the server is listening on.
@param port the port that the server is listening on
@return a reference to <code>this</code>
@throws IllegalArgumentException if port is outside the valid range of [0..65535] inclusive.
@throws IllegalStateException if a locator has already been {@link #addPoolLocator added} to
        this factory.
geode-core/src/main/java/org/apache/geode/cache/client/ClientCacheFactory.java