io.netty.handler.address.ResolveAddressHandler 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 2020 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.handler.address;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelOutboundHandlerAdapter;
import io.netty.channel.ChannelPromise;
import io.netty.resolver.AddressResolver;
import io.netty.resolver.AddressResolverGroup;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.FutureListener;
import io.netty.util.internal.ObjectUtil;
import java.net.SocketAddress;
/**
* {@link ChannelOutboundHandlerAdapter} which will resolve the {@link SocketAddress} that is passed to
* {@link #connect(ChannelHandlerContext, SocketAddress, SocketAddress, ChannelPromise)} if it is not already resolved
* and the {@link AddressResolver} supports the type of {@link SocketAddress}.
*/
@Sharable
public class ResolveAddressHandler extends ChannelOutboundHandlerAdapter {
private final AddressResolverGroup resolverGroup;
public ResolveAddressHandler(AddressResolverGroup resolverGroup) {
this.resolverGroup = ObjectUtil.checkNotNull(resolverGroup, "resolverGroup");
}
@Override
public void connect(final ChannelHandlerContext ctx, SocketAddress remoteAddress,
final SocketAddress localAddress, final ChannelPromise promise) {
AddressResolver resolver = resolverGroup.getResolver(ctx.executor());
if (resolver.isSupported(remoteAddress) && !resolver.isResolved(remoteAddress)) {
resolver.resolve(remoteAddress).addListener(new FutureListener() {
@Override
public void operationComplete(Future future) {
Throwable cause = future.cause();
if (cause != null) {
promise.setFailure(cause);
} else {
ctx.connect(future.getNow(), localAddress, promise);
}
ctx.pipeline().remove(ResolveAddressHandler.this);
}
});
} else {
ctx.connect(remoteAddress, localAddress, promise);
ctx.pipeline().remove(this);
}
}
}