private void validateConfig(final JsonRpcConfiguration config) {
    checkArgument(
        config.getPort() == 0 || NetworkUtility.isValidPort(config.getPort()),
        "Invalid port configuration.");
    checkArgument(config.getHost() != null, "Required host is not configured.");
    checkArgument(
        config.getMaxActiveConnections() > 0, "Invalid max active connections configuration.");
  }
Construct a EngineJsonRpcService to handle either http or websocket clients

@param vertx The vertx process that will be running this service
@param dataDir The data directory where requests can be buffered
@param config Configuration for the rpc methods being loaded
@param metricsSystem The metrics service that activities should be reported to
@param natService The NAT environment manager.
@param methods The json rpc methods that should be enabled
@param maybeSockets websocket configuration to use
@param scheduler for managing ETH tasks
@param authenticationService used to grant or deny access to methods served
@param livenessService A service responsible for reporting whether this node is live
@param readinessService A service responsible for reporting whether this node has fully started
ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/EngineJsonRpcService.java