0cb4cc4e49
Motivation: We wish to separate these two into clearer write/read interfaces. In particular, we don't want to be able to add listeners to promises, because it makes it easy to add them out of order. We can't prevent it entirely, because any promise can be freely converted to a future where listeners can be added. We can, however, discourage this in the API. Modification: The Promise interface no longer extends the Future interface. Numerous changes to make the project compile and its tests run. Result: Clearer separation of concerns in the code.
67 lines
2.7 KiB
Java
67 lines
2.7 KiB
Java
/*
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* Copyright 2020 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.address;
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import io.netty.channel.ChannelHandler;
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import io.netty.channel.ChannelHandler.Sharable;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.resolver.AddressResolver;
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import io.netty.resolver.AddressResolverGroup;
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import io.netty.util.concurrent.Future;
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import io.netty.util.concurrent.FutureListener;
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import io.netty.util.concurrent.Promise;
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import java.net.SocketAddress;
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import java.util.Objects;
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/**
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* {@link ChannelHandler} which will resolve the {@link SocketAddress} that is passed to
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* {@link #connect(ChannelHandlerContext, SocketAddress, SocketAddress)} if it is not already resolved
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* and the {@link AddressResolver} supports the type of {@link SocketAddress}.
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*/
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@Sharable
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public class ResolveAddressHandler implements ChannelHandler {
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private final AddressResolverGroup<? extends SocketAddress> resolverGroup;
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public ResolveAddressHandler(AddressResolverGroup<? extends SocketAddress> resolverGroup) {
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this.resolverGroup = Objects.requireNonNull(resolverGroup, "resolverGroup");
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}
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@Override
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public Future<Void> connect(final ChannelHandlerContext ctx, SocketAddress remoteAddress,
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final SocketAddress localAddress) {
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AddressResolver<? extends SocketAddress> resolver = resolverGroup.getResolver(ctx.executor());
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if (resolver.isSupported(remoteAddress) && !resolver.isResolved(remoteAddress)) {
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Promise<Void> promise = ctx.newPromise();
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resolver.resolve(remoteAddress).addListener((FutureListener<SocketAddress>) future -> {
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Throwable cause = future.cause();
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if (cause != null) {
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promise.setFailure(cause);
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} else {
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ctx.connect(future.getNow(), localAddress).cascadeTo(promise);
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}
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ctx.pipeline().remove(this);
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});
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return promise.asFuture();
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} else {
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Future<Void> f = ctx.connect(remoteAddress, localAddress);
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ctx.pipeline().remove(this);
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return f;
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}
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}
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}
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