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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * Copyright 2017 The Netty Project
 *
 * The Netty Project licenses this file to you 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.netty.resolver.dns;

import io.netty.util.internal.UnstableApi;

import java.net.InetAddress;

/**
 * Represents the results from a previous DNS query which can be cached.
 */
@UnstableApi
public interface DnsCacheEntry {
    /**
     * Get the resolved address.
     * 
     * This may be null if the resolution failed, and in that case {@link #cause()} will describe the failure.
     * @return the resolved address.
     */
    InetAddress address();

    /**
     * If the DNS query failed this will provide the rational.
     * @return the rational for why the DNS query failed, or {@code null} if the query hasn't failed.
     */
    Throwable cause();
}