LoginHandler.java

err.visit(AuthError.<NetworkCommand>visitor()
		.alreadyConnected(it -> client.write(new IdentificationFailedMessage(
				(byte) IdentificationFailureReasonEnum.TOO_MANY_ON_IP.value)))

		.banned(it -> client.write(new IdentificationFailedBannedMessage(
				(byte) IdentificationFailureReasonEnum.BANNED.value,
				it.getEnd().toEpochMilli())))

		.wrongCredentials(it -> client.write(new IdentificationFailedMessage(
				(byte) IdentificationFailureReasonEnum.WRONG_CREDENTIALS.value)))

		.otherwise(it -> client.write(new IdentificationFailedMessage(
				(byte) IdentificationFailureReasonEnum.UNKNOWN_AUTH_ERROR.value)))

		.build())
	.reduce(NetworkCommand::then)
	.ifPresent(NetworkCommand::async);