How to use org.jgroups.protocols.relay.config

public String toString() {
  return super.toString() + ", protocols=" + printProtocols(protocols);
}

  public String toString() {return "config=" + config + super.toString();}
}

public void parse(Node node) throws Exception {
  RelayConfig.parse(node, sites);
}

protected static void parseBridges(SiteConfig site_config, Node root) throws Exception {
  NodeList children=root.getChildNodes();
  if(children == null || children.getLength() == 0)
    return;
  for(int i=0; i < children.getLength(); i++) {
    Node node=children.item(i);
    if(node.getNodeType() != Node.ELEMENT_NODE)
      continue;
    String node_name=node.getNodeName();
    match(BRIDGE, node_name, true);
    NamedNodeMap attrs=node.getAttributes();
    if(attrs == null || attrs.getLength() == 0)
      continue;
    Attr name_attr=(Attr)attrs.getNamedItem("name");
    Attr config_attr=(Attr)attrs.getNamedItem("config");
    String name=name_attr != null? name_attr.getValue() : null;
    String config=config_attr.getValue();
    BridgeConfig bridge_config=new PropertiesBridgeConfig(name, config);
    site_config.addBridge(bridge_config);
  }
}

protected static void parseSites(final Map<String,SiteConfig> map, Node root) throws Exception {
  NodeList children=root.getChildNodes();
  if(children == null || children.getLength() == 0)
    return;
  for(int i=0; i < children.getLength(); i++) {
    Node node=children.item(i);
    if(node.getNodeType() != Node.ELEMENT_NODE)
      continue;
    match(SITE, node.getNodeName(), true);
    NamedNodeMap attrs=node.getAttributes();
    if(attrs == null || attrs.getLength() == 0)
      continue;
    Attr name_attr=(Attr)attrs.getNamedItem("name");
    String name=name_attr.getValue();
    if(map.containsKey(name))
      throw new Exception("Site \"" + name + "\" already defined");
    SiteConfig site_config=new SiteConfig(name);
    map.put(name, site_config);
    parseBridgesAndForwards(site_config, node);
  }
}

RelayConfig.SiteConfig siteConfig = new RelayConfig.SiteConfig(site);
protocol.addSite(site, siteConfig);
if (site.equals(localSite)) {
  for (RelayConfig.BridgeConfig bridge: bridges.values()) {
    siteConfig.addBridge(bridge);

protected static void parseForwards(SiteConfig site_config, Node root) throws Exception {
  NodeList children=root.getChildNodes();
  if(children == null || children.getLength() == 0)
    return;
  for(int i=0; i < children.getLength(); i++) {
    Node node=children.item(i);
    if(node.getNodeType() != Node.ELEMENT_NODE)
      continue;
    String node_name=node.getNodeName();
    match(FORWARD, node_name, true);
    NamedNodeMap attrs=node.getAttributes();
    if(attrs == null || attrs.getLength() == 0)
      continue;
    Attr to_attr=(Attr)attrs.getNamedItem("to");
    Attr gw_attr=(Attr)attrs.getNamedItem("gateway");
    String to=to_attr.getValue();
    String gateway=gw_attr.getValue();
    ForwardConfig forward_config=new ForwardConfig(to, gateway);
    site_config.addForward(forward_config);
  }
}

public static void parse(Node root, final Map<String,SiteConfig> map) throws Exception {
  match(RELAY_CONFIG, root.getNodeName(), true);
  NodeList children=root.getChildNodes();
  if(children == null || children.getLength() == 0)
    return;
  for(int i=0; i < children.getLength(); i++) {
    Node node=children.item(i);
    if(node.getNodeType() != Node.ELEMENT_NODE)
      continue;
    String element_name=node.getNodeName();
    if(SITES.equals(element_name))
      parseSites(map, node);
    else
      throw new Exception("expected <" + SITES + ">, but got " + "<" + element_name + ">");
  }
}

protected static void parseBridgesAndForwards(SiteConfig site_config, Node root) throws Exception {
  NodeList children=root.getChildNodes();
  if(children == null || children.getLength() == 0)
    return;
  for(int i=0; i < children.getLength(); i++) {
    Node node=children.item(i);
    if(node.getNodeType() != Node.ELEMENT_NODE)
      continue;
    String node_name=node.getNodeName();
    if(BRIDGES.equals(node_name))
      parseBridges(site_config, node);
    else if(FORWARDS.equals(node_name))
      parseForwards(site_config, node);
    else
      throw new Exception("expected \"" + BRIDGES + "\" or \"" + FORWARDS + "\" keywords");
  }
}

protected void startRelayer(Relayer rel, String bridge_name) {
  try {
    log.trace(local_addr + ": became site master; starting bridges");
    rel.start(site_config.getBridges(), bridge_name, site);
  }
  catch(Throwable t) {
    log.error(local_addr + ": failed starting relayer", t);
  }
}

Bridge bridge=new Bridge(bridge_config.createChannel(), bridge_config.getClusterName(), bridge_name,
             () -> new SiteUUID(UUID.randomUUID(), null, my_site_id));
bridges.add(bridge);

log.trace(local_addr + ": site configuration:\n" + site_config);
if(!site_config.getForwards().isEmpty())
  log.warn(local_addr + ": forwarding routes are currently not supported and will be ignored. This will change " +
        "with hierarchical routing (https://issues.jboss.org/browse/JGRP-1506)");

protected static void parseBridges(SiteConfig site_config, Node root) throws Exception {
  NodeList children=root.getChildNodes();
  if(children == null || children.getLength() == 0)
    return;
  for(int i=0; i < children.getLength(); i++) {
    Node node=children.item(i);
    if(node.getNodeType() != Node.ELEMENT_NODE)
      continue;
    String node_name=node.getNodeName();
    match(BRIDGE, node_name, true);
    NamedNodeMap attrs=node.getAttributes();
    if(attrs == null || attrs.getLength() == 0)
      continue;
    Attr name_attr=(Attr)attrs.getNamedItem("name");
    Attr config_attr=(Attr)attrs.getNamedItem("config");
    String name=name_attr != null? name_attr.getValue() : null;
    String config=config_attr.getValue();
    BridgeConfig bridge_config=new PropertiesBridgeConfig(name, config);
    site_config.addBridge(bridge_config);
  }
}

public String toString() {
  return super.toString() + ", protocols=" + printProtocols(protocols);
}

/** Parses site names and their configuration (e.g. "nyc" --> SiteConfig) into the map passed as argument */
public static void parse(InputStream input, final Map<String,SiteConfig> map) throws Exception {
  DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
  factory.setValidating(false); // for now
  DocumentBuilder builder=factory.newDocumentBuilder();
  Document document=builder.parse(input);
  Element root=document.getDocumentElement();
  parse(root, map);
}

protected void startRelayer(Relayer rel, String bridge_name) {
  try {
    log.trace(local_addr + ": became site master; starting bridges");
    rel.start(site_config.getBridges(), bridge_name, site);
  }
  catch(Throwable t) {
    log.error(local_addr + ": failed starting relayer", t);
  }
}

  public String toString() {return "config=" + config + super.toString();}
}

  public static void main(String[] args) throws Exception {
    InputStream input=new FileInputStream("/home/bela/relay2.xml");
    Map<String,SiteConfig> sites=new HashMap<>();
    RelayConfig.parse(input, sites);
    System.out.println("sites:");
    for(Map.Entry<String,SiteConfig> entry: sites.entrySet())
      System.out.println(entry.getKey() + ":\n" + entry.getValue() + "\n");

  }
}

/**
 * Parses the configuration by reading the config file.
 * @throws Exception
 */
protected void parseSiteConfiguration(final Map<String,RelayConfig.SiteConfig> map) throws Exception {
  InputStream input=null;
  try {
    input=ConfiguratorFactory.getConfigStream(config);
    RelayConfig.parse(input, map);
  }
  finally {
    Util.close(input);
  }
}

public void parse(Node node) throws Exception {
  RelayConfig.parse(node, sites);
}