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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 2016 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.channel.EventLoop;
import io.netty.handler.codec.dns.DnsRecord;
import io.netty.util.internal.UnstableApi;

import java.net.InetAddress;
import java.util.Collections;
import java.util.List;

/**
 * A noop DNS cache that actually never caches anything.
 */
@UnstableApi
public final class NoopDnsCache implements DnsCache {

    public static final NoopDnsCache INSTANCE = new NoopDnsCache();

    /**
     * Private singleton constructor.
     */
    private NoopDnsCache() {
    }

    @Override
    public void clear() {
    }

    @Override
    public boolean clear(String hostname) {
        return false;
    }

    @Override
    public List get(String hostname, DnsRecord[] additionals) {
        return Collections.emptyList();
    }

    @Override
    public DnsCacheEntry cache(String hostname, DnsRecord[] additional,
                               InetAddress address, long originalTtl, EventLoop loop) {
        return new NoopDnsCacheEntry(address);
    }

    @Override
    public DnsCacheEntry cache(String hostname, DnsRecord[] additional, Throwable cause, EventLoop loop) {
        return null;
    }

    @Override
    public String toString() {
        return NoopDnsCache.class.getSimpleName();
    }

    private static final class NoopDnsCacheEntry implements DnsCacheEntry {
        private final InetAddress address;

        NoopDnsCacheEntry(InetAddress address) {
            this.address = address;
        }

        @Override
        public InetAddress address() {
            return address;
        }

        @Override
        public Throwable cause() {
            return null;
        }

        @Override
        public String toString() {
            return address.toString();
        }
    }
}