io.netty.resolver.InetNameResolver Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS 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 2015 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:
*
* https://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;
import io.netty.util.concurrent.EventExecutor;
import io.netty.util.concurrent.Future;
import java.net.InetAddress;
import java.net.InetSocketAddress;
/**
* A skeletal {@link NameResolver} implementation that resolves {@link InetAddress}.
*/
public abstract class InetNameResolver extends SimpleNameResolver {
private volatile AddressResolver addressResolver;
/**
* @param executor the {@link EventExecutor} which is used to notify the listeners of the {@link Future} returned
* by {@link #resolve(String)}
*/
protected InetNameResolver(EventExecutor executor) {
super(executor);
}
/**
* Return a {@link AddressResolver} that will use this name resolver underneath.
* It's cached internally, so the same instance is always returned.
*/
public AddressResolver asAddressResolver() {
AddressResolver result = addressResolver;
if (result == null) {
synchronized (this) {
result = addressResolver;
if (result == null) {
addressResolver = result = new InetSocketAddressResolver(executor(), this);
}
}
}
return result;
}
}