442 lines
15 KiB
Java
442 lines
15 KiB
Java
/*
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* Copyright 2012 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.bootstrap;
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import io.netty.channel.Channel;
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import io.netty.channel.ChannelFutureListeners;
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import io.netty.channel.ChannelHandler;
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import io.netty.channel.ChannelOption;
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import io.netty.channel.EventLoop;
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import io.netty.channel.EventLoopGroup;
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import io.netty.util.AttributeKey;
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import io.netty.util.concurrent.DefaultPromise;
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import io.netty.util.concurrent.Future;
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import io.netty.util.concurrent.Promise;
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import io.netty.util.concurrent.PromiseNotifier;
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import io.netty.util.internal.SocketUtils;
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import io.netty.util.internal.StringUtil;
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import io.netty.util.internal.logging.InternalLogger;
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import java.net.InetAddress;
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import java.net.InetSocketAddress;
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import java.net.SocketAddress;
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import java.util.Collections;
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import java.util.LinkedHashMap;
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import java.util.Map;
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import java.util.concurrent.ConcurrentHashMap;
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import static io.netty.util.concurrent.PromiseNotifier.cascade;
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import static java.util.Objects.requireNonNull;
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/**
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* {@link AbstractBootstrap} is a helper class that makes it easy to bootstrap a {@link Channel}. It support
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* method-chaining to provide an easy way to configure the {@link AbstractBootstrap}.
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*
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* <p>When not used in a {@link ServerBootstrap} context, the {@link #bind()} methods are useful for connectionless
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* transports such as datagram (UDP).</p>
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*/
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public abstract class AbstractBootstrap<B extends AbstractBootstrap<B, C, F>, C extends Channel, F>
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implements Cloneable {
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@SuppressWarnings("unchecked")
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private static final Map.Entry<ChannelOption<?>, Object>[] EMPTY_OPTION_ARRAY = new Map.Entry[0];
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@SuppressWarnings("unchecked")
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private static final Map.Entry<AttributeKey<?>, Object>[] EMPTY_ATTRIBUTE_ARRAY = new Map.Entry[0];
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volatile EventLoopGroup group;
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private volatile SocketAddress localAddress;
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// The order in which ChannelOptions are applied is important they may depend on each other for validation
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// purposes.
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private final Map<ChannelOption<?>, Object> options = new LinkedHashMap<>();
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private final Map<AttributeKey<?>, Object> attrs = new ConcurrentHashMap<>();
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private volatile ChannelHandler handler;
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AbstractBootstrap() {
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// Disallow extending from a different package.
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}
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AbstractBootstrap(AbstractBootstrap<B, C, F> bootstrap) {
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group = bootstrap.group;
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handler = bootstrap.handler;
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localAddress = bootstrap.localAddress;
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synchronized (bootstrap.options) {
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options.putAll(bootstrap.options);
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}
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attrs.putAll(bootstrap.attrs);
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}
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/**
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* The {@link EventLoopGroup} which is used to handle all the events for the to-be-created
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* {@link Channel}
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*/
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public B group(EventLoopGroup group) {
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requireNonNull(group, "group");
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if (this.group != null) {
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throw new IllegalStateException("group set already");
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}
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this.group = group;
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return self();
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}
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@SuppressWarnings("unchecked")
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private B self() {
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return (B) this;
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}
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/**
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* The {@link SocketAddress} which is used to bind the local "end" to.
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*/
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public B localAddress(SocketAddress localAddress) {
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this.localAddress = localAddress;
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return self();
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}
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/**
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* @see #localAddress(SocketAddress)
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*/
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public B localAddress(int inetPort) {
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return localAddress(new InetSocketAddress(inetPort));
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}
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/**
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* @see #localAddress(SocketAddress)
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*/
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public B localAddress(String inetHost, int inetPort) {
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return localAddress(SocketUtils.socketAddress(inetHost, inetPort));
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}
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/**
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* @see #localAddress(SocketAddress)
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*/
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public B localAddress(InetAddress inetHost, int inetPort) {
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return localAddress(new InetSocketAddress(inetHost, inetPort));
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}
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/**
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* Allow to specify a {@link ChannelOption} which is used for the {@link Channel} instances once they got
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* created. Use a value of {@code null} to remove a previous set {@link ChannelOption}.
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*/
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public <T> B option(ChannelOption<T> option, T value) {
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requireNonNull(option, "option");
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synchronized (options) {
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if (value == null) {
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options.remove(option);
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} else {
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options.put(option, value);
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}
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}
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return self();
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}
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/**
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* Allow to specify an initial attribute of the newly created {@link Channel}. If the {@code value} is
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* {@code null}, the attribute of the specified {@code key} is removed.
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*/
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public <T> B attr(AttributeKey<T> key, T value) {
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requireNonNull(key, "key");
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if (value == null) {
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attrs.remove(key);
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} else {
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attrs.put(key, value);
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}
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return self();
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}
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/**
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* Validate all the parameters. Sub-classes may override this, but should
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* call the super method in that case.
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*/
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public B validate() {
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if (group == null) {
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throw new IllegalStateException("group not set");
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}
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return self();
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}
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/**
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* Returns a deep clone of this bootstrap which has the identical configuration. This method is useful when making
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* multiple {@link Channel}s with similar settings. Please note that this method does not clone the
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* {@link EventLoopGroup} deeply but shallowly, making the group a shared resource.
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*/
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@Override
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@SuppressWarnings("CloneDoesntDeclareCloneNotSupportedException")
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public abstract B clone();
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/**
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* Create a new {@link Channel} and register it with an {@link EventLoop}.
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*/
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public Future<Channel> register() {
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validate();
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return initAndRegister(group.next());
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}
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/**
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* Create a new unregistered channel.
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* <p>
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* The channel must then be {@linkplain Channel#register() registered} separately.
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*
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* @return A new unregistered channel.
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* @throws Exception If the channel cannot be created.
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*/
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public Channel createUnregistered() throws Exception {
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validate();
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return initWithoutRegister();
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}
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/**
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* Create a new {@link Channel} and bind it.
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*/
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public Future<Channel> bind() {
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validate();
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SocketAddress localAddress = this.localAddress;
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requireNonNull(localAddress, "localAddress");
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return doBind(localAddress);
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}
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/**
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* Create a new {@link Channel} and bind it.
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*/
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public Future<Channel> bind(int inetPort) {
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return bind(new InetSocketAddress(inetPort));
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}
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/**
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* Create a new {@link Channel} and bind it.
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*/
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public Future<Channel> bind(String inetHost, int inetPort) {
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return bind(SocketUtils.socketAddress(inetHost, inetPort));
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}
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/**
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* Create a new {@link Channel} and bind it.
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*/
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public Future<Channel> bind(InetAddress inetHost, int inetPort) {
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return bind(new InetSocketAddress(inetHost, inetPort));
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}
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/**
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* Create a new {@link Channel} and bind it.
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*/
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public Future<Channel> bind(SocketAddress localAddress) {
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validate();
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requireNonNull(localAddress, "localAddress");
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return doBind(localAddress);
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}
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private Future<Channel> doBind(final SocketAddress localAddress) {
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EventLoop loop = group.next();
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final Future<Channel> regFuture = initAndRegister(loop);
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if (regFuture.isFailed()) {
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return regFuture;
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}
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Promise<Channel> bindPromise = new DefaultPromise<>(loop);
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if (regFuture.isDone()) {
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// At this point we know that the registration was complete and successful.
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Channel channel = regFuture.getNow();
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Promise<Void> promise = channel.newPromise();
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cascade(true, promise, bindPromise, channel);
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doBind0(regFuture, channel, localAddress, promise);
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} else {
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// Registration future is almost always fulfilled already, but just in case it's not.
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regFuture.addListener(future -> {
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Throwable cause = future.cause();
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if (cause != null) {
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// Registration on the EventLoop failed so fail the Promise directly to not cause an
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// IllegalStateException once we try to access the EventLoop of the Channel.
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bindPromise.setFailure(cause);
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} else {
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Channel channel = future.getNow();
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Promise<Void> promise = channel.newPromise();
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cascade(true, promise, bindPromise, channel);
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doBind0(regFuture, channel, localAddress, promise);
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}
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});
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}
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return bindPromise;
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}
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final Future<Channel> initAndRegister(EventLoop loop) {
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final Channel channel;
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try {
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channel = newChannel(loop);
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} catch (Throwable t) {
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return DefaultPromise.newFailedPromise(loop, t);
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}
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Promise<Channel> promise = new DefaultPromise<>(loop);
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loop.execute(() -> init(channel).addListener(future -> {
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if (future.isSuccess()) {
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// TODO eventually I think we'd like to be able to either pass the generic promise down,
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// or return the future from register().
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channel.register().addListener(f -> {
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promise.setSuccess(channel);
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});
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} else {
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channel.unsafe().closeForcibly();
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promise.setFailure(future.cause());
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}
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}));
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return promise;
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}
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final Channel initWithoutRegister() throws Exception {
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EventLoop loop = group.next();
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Channel channel = newChannel(loop);
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init(channel).addListener(future -> {
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if (!future.isSuccess()) {
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channel.unsafe().closeForcibly();
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}
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});
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return channel;
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}
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abstract C newChannel(EventLoop loop) throws Exception;
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abstract Future<Channel> init(Channel channel);
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private static void doBind0(
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final Future<Channel> regFuture, final Channel channel,
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final SocketAddress localAddress, final Promise<Void> promise) {
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// This method is invoked before channelRegistered() is triggered. Give user handlers a chance to set up
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// the pipeline in its channelRegistered() implementation.
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channel.executor().execute(() -> {
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if (regFuture.isSuccess()) {
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PromiseNotifier.cascade(channel.bind(localAddress), promise)
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.addListener(channel, ChannelFutureListeners.CLOSE_ON_FAILURE);
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} else {
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promise.setFailure(regFuture.cause());
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}
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});
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}
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/**
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* the {@link ChannelHandler} to use for serving the requests.
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*/
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public B handler(ChannelHandler handler) {
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requireNonNull(handler, "handler");
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this.handler = handler;
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return self();
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}
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/**
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* Returns the configured {@link EventLoopGroup} or {@code null} if non is configured yet.
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*
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* @deprecated Use {@link #config()} instead.
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*/
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@Deprecated
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public final EventLoopGroup group() {
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return group;
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}
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/**
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* Returns the {@link AbstractBootstrapConfig} object that can be used to obtain the current config
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* of the bootstrap.
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*/
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public abstract AbstractBootstrapConfig<B, C, F> config();
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final Map.Entry<ChannelOption<?>, Object>[] newOptionsArray() {
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return newOptionsArray(options);
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}
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static Map.Entry<ChannelOption<?>, Object>[] newOptionsArray(Map<ChannelOption<?>, Object> options) {
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synchronized (options) {
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return new LinkedHashMap<ChannelOption<?>, Object>(options).entrySet().toArray(EMPTY_OPTION_ARRAY);
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}
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}
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final Map.Entry<AttributeKey<?>, Object>[] newAttributesArray() {
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return newAttributesArray(attrs0());
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}
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static Map.Entry<AttributeKey<?>, Object>[] newAttributesArray(Map<AttributeKey<?>, Object> attributes) {
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return attributes.entrySet().toArray(EMPTY_ATTRIBUTE_ARRAY);
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}
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final Map<ChannelOption<?>, Object> options0() {
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return options;
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}
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final Map<AttributeKey<?>, Object> attrs0() {
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return attrs;
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}
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final SocketAddress localAddress() {
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return localAddress;
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}
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final ChannelHandler handler() {
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return handler;
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}
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final Map<ChannelOption<?>, Object> options() {
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synchronized (options) {
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return copiedMap(options);
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}
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}
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final Map<AttributeKey<?>, Object> attrs() {
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return copiedMap(attrs);
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}
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static <K, V> Map<K, V> copiedMap(Map<K, V> map) {
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if (map.isEmpty()) {
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return Collections.emptyMap();
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}
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return Map.copyOf(map);
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}
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static void setAttributes(Channel channel, Map.Entry<AttributeKey<?>, Object>[] attrs) {
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for (Map.Entry<AttributeKey<?>, Object> e: attrs) {
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@SuppressWarnings("unchecked")
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AttributeKey<Object> key = (AttributeKey<Object>) e.getKey();
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channel.attr(key).set(e.getValue());
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}
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}
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static void setChannelOptions(
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Channel channel, Map.Entry<ChannelOption<?>, Object>[] options, InternalLogger logger) {
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for (Map.Entry<ChannelOption<?>, Object> e: options) {
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setChannelOption(channel, e.getKey(), e.getValue(), logger);
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}
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}
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@SuppressWarnings("unchecked")
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private static void setChannelOption(
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Channel channel, ChannelOption<?> option, Object value, InternalLogger logger) {
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try {
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if (!channel.config().setOption((ChannelOption<Object>) option, value)) {
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logger.warn("Unknown channel option '{}' for channel '{}'", option, channel);
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}
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} catch (Throwable t) {
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logger.warn(
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"Failed to set channel option '{}' with value '{}' for channel '{}'", option, value, channel, t);
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}
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}
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@Override
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public String toString() {
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StringBuilder buf = new StringBuilder()
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.append(StringUtil.simpleClassName(this))
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.append('(').append(config()).append(')');
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return buf.toString();
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}
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}
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