io.netty.resolver.dns.NoopAuthoritativeDnsServerCache Maven / Gradle / Ivy

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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 2018 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.util.internal.UnstableApi;

import java.net.InetSocketAddress;

/**
 * A noop {@link AuthoritativeDnsServerCache} that actually never caches anything.
 */
@UnstableApi
public final class NoopAuthoritativeDnsServerCache implements AuthoritativeDnsServerCache {
    public static final NoopAuthoritativeDnsServerCache INSTANCE = new NoopAuthoritativeDnsServerCache();

    private NoopAuthoritativeDnsServerCache() { }

    @Override
    public DnsServerAddressStream get(String hostname) {
        return null;
    }

    @Override
    public void cache(String hostname, InetSocketAddress address, long originalTtl, EventLoop loop) {
        // NOOP
    }

    @Override
    public void clear() {
        // NOOP
    }

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