code: public Set<Node> find(String host) {
  		Set<Node> resultSet = new HashSet<Node>();
  
  		if (host != null) {
  			for (Node node : socketToNodeMap.values()) {
  				if (host.equals(node.getHost())) {
  					resultSet.add(node);
  				}
  			}
  		}
  
  		return resultSet;
  	}
docs: Finds the set of nodes by host.
  
  @param host
  - the host.
  @return - the found nodes.