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/*
 * Copyright (C) 2015 SoftIndex LLC.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.datakernel.dns;

import io.datakernel.async.Callback;
import io.datakernel.async.SettableStage;
import io.datakernel.async.Stage;

import java.net.InetAddress;

/**
 * Resolves the IP address for the specified host name, or null if the given
 * host is not recognized or the associated IP address cannot be used to build
 * an {@code InetAddress} instance.
 */
public interface IAsyncDnsClient {
	/**
	 * Resolves a IP for the IPv4 addresses and handles it with callback
	 *
	 * @param domainName domain name for searching IP
	 */
	default Stage resolve4(String domainName) {
		SettableStage result = SettableStage.create();
		resolve4(domainName, result);
		return result;
	}

	void resolve4(String domainName, Callback callback);

	/**
	 * Resolves a IP for the IPv6 addresses and handles it with callback
	 *
	 * @param domainName domain name for searching IP
	 */
	default Stage resolve6(String domainName) {
		SettableStage result = SettableStage.create();
		resolve6(domainName, result);
		return result;
	}

	void resolve6(String domainName, Callback callback);
}