803 lines
25 KiB
Java
803 lines
25 KiB
Java
/*
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* Copyright 2009 Red Hat, Inc.
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*
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* Red Hat licenses this file to you under the Apache License, version 2.0
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* (the "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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*
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* http://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 org.jboss.netty.channel;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.LinkedHashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.NoSuchElementException;
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import org.jboss.netty.logging.InternalLogger;
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import org.jboss.netty.logging.InternalLoggerFactory;
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/**
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* The default {@link ChannelPipeline} implementation. It is recommended
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* to use {@link Channels#pipeline()} to create a new {@link ChannelPipeline}
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* instance rather than calling the constructor directly.
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*
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* @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
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* @author <a href="http://gleamynode.net/">Trustin Lee</a>
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*
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* @version $Rev: 2119 $, $Date: 2010-02-01 20:46:09 +0900 (Mon, 01 Feb 2010) $
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*
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*/
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public class DefaultChannelPipeline implements ChannelPipeline {
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static final InternalLogger logger = InternalLoggerFactory.getInstance(DefaultChannelPipeline.class);
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static final ChannelSink discardingSink = new DiscardingChannelSink();
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private volatile Channel channel;
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private volatile ChannelSink sink;
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private volatile DefaultChannelHandlerContext head;
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private volatile DefaultChannelHandlerContext tail;
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private final Map<String, DefaultChannelHandlerContext> name2ctx =
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new HashMap<String, DefaultChannelHandlerContext>(4);
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/**
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* Creates a new empty pipeline.
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*/
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public DefaultChannelPipeline() {
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super();
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}
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public Channel getChannel() {
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return channel;
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}
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public ChannelSink getSink() {
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ChannelSink sink = this.sink;
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if (sink == null) {
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return discardingSink;
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}
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return sink;
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}
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public void attach(Channel channel, ChannelSink sink) {
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if (channel == null) {
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throw new NullPointerException("channel");
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}
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if (sink == null) {
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throw new NullPointerException("sink");
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}
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if (this.channel != null || this.sink != null) {
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throw new IllegalStateException("attached already");
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}
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this.channel = channel;
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this.sink = sink;
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}
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public boolean isAttached() {
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return sink != null;
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}
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public synchronized void addFirst(String name, ChannelHandler handler) {
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if (name2ctx.isEmpty()) {
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init(name, handler);
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} else {
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checkDuplicateName(name);
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DefaultChannelHandlerContext oldHead = head;
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DefaultChannelHandlerContext newHead = new DefaultChannelHandlerContext(null, oldHead, name, handler);
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callBeforeAdd(newHead);
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oldHead.prev = newHead;
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head = newHead;
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name2ctx.put(name, newHead);
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callAfterAdd(newHead);
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}
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}
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public synchronized void addLast(String name, ChannelHandler handler) {
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if (name2ctx.isEmpty()) {
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init(name, handler);
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} else {
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checkDuplicateName(name);
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DefaultChannelHandlerContext oldTail = tail;
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DefaultChannelHandlerContext newTail = new DefaultChannelHandlerContext(oldTail, null, name, handler);
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callBeforeAdd(newTail);
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oldTail.next = newTail;
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tail = newTail;
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name2ctx.put(name, newTail);
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callAfterAdd(newTail);
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}
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}
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public synchronized void addBefore(String baseName, String name, ChannelHandler handler) {
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DefaultChannelHandlerContext ctx = getContextOrDie(baseName);
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if (ctx == head) {
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addFirst(name, handler);
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} else {
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checkDuplicateName(name);
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DefaultChannelHandlerContext newCtx = new DefaultChannelHandlerContext(ctx.prev, ctx, name, handler);
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callBeforeAdd(newCtx);
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ctx.prev.next = newCtx;
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ctx.prev = newCtx;
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name2ctx.put(name, newCtx);
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callAfterAdd(newCtx);
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}
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}
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public synchronized void addAfter(String baseName, String name, ChannelHandler handler) {
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DefaultChannelHandlerContext ctx = getContextOrDie(baseName);
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if (ctx == tail) {
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addLast(name, handler);
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} else {
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checkDuplicateName(name);
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DefaultChannelHandlerContext newCtx = new DefaultChannelHandlerContext(ctx, ctx.next, name, handler);
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callBeforeAdd(newCtx);
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ctx.next.prev = newCtx;
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ctx.next = newCtx;
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name2ctx.put(name, newCtx);
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callAfterAdd(newCtx);
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}
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}
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public synchronized void remove(ChannelHandler handler) {
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remove(getContextOrDie(handler));
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}
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public synchronized ChannelHandler remove(String name) {
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return remove(getContextOrDie(name)).getHandler();
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}
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@SuppressWarnings("unchecked")
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public synchronized <T extends ChannelHandler> T remove(Class<T> handlerType) {
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return (T) remove(getContextOrDie(handlerType)).getHandler();
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}
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private DefaultChannelHandlerContext remove(DefaultChannelHandlerContext ctx) {
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if (head == tail) {
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head = tail = null;
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name2ctx.clear();
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} else if (ctx == head) {
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removeFirst();
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} else if (ctx == tail) {
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removeLast();
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} else {
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callBeforeRemove(ctx);
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DefaultChannelHandlerContext prev = ctx.prev;
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DefaultChannelHandlerContext next = ctx.next;
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prev.next = next;
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next.prev = prev;
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name2ctx.remove(ctx.getName());
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callAfterRemove(ctx);
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}
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return ctx;
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}
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public synchronized ChannelHandler removeFirst() {
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if (name2ctx.isEmpty()) {
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throw new NoSuchElementException();
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}
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DefaultChannelHandlerContext oldHead = head;
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if (oldHead == null) {
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throw new NoSuchElementException();
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}
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callBeforeRemove(oldHead);
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if (oldHead.next == null) {
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head = tail = null;
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name2ctx.clear();
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} else {
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oldHead.next.prev = null;
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head = oldHead.next;
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name2ctx.remove(oldHead.getName());
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}
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callAfterRemove(oldHead);
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return oldHead.getHandler();
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}
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public synchronized ChannelHandler removeLast() {
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if (name2ctx.isEmpty()) {
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throw new NoSuchElementException();
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}
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DefaultChannelHandlerContext oldTail = tail;
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if (oldTail == null) {
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throw new NoSuchElementException();
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}
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callBeforeRemove(oldTail);
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if (oldTail.prev == null) {
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head = tail = null;
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name2ctx.clear();
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} else {
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oldTail.prev.next = null;
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tail = oldTail.prev;
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name2ctx.remove(oldTail.getName());
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}
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callBeforeRemove(oldTail);
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return oldTail.getHandler();
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}
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public synchronized void replace(ChannelHandler oldHandler, String newName, ChannelHandler newHandler) {
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replace(getContextOrDie(oldHandler), newName, newHandler);
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}
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public synchronized ChannelHandler replace(String oldName, String newName, ChannelHandler newHandler) {
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return replace(getContextOrDie(oldName), newName, newHandler);
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}
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@SuppressWarnings("unchecked")
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public synchronized <T extends ChannelHandler> T replace(
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Class<T> oldHandlerType, String newName, ChannelHandler newHandler) {
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return (T) replace(getContextOrDie(oldHandlerType), newName, newHandler);
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}
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private ChannelHandler replace(DefaultChannelHandlerContext ctx, String newName, ChannelHandler newHandler) {
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if (ctx == head) {
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removeFirst();
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addFirst(newName, newHandler);
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} else if (ctx == tail) {
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removeLast();
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addLast(newName, newHandler);
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} else {
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boolean sameName = ctx.getName().equals(newName);
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if (!sameName) {
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checkDuplicateName(newName);
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}
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DefaultChannelHandlerContext prev = ctx.prev;
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DefaultChannelHandlerContext next = ctx.next;
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DefaultChannelHandlerContext newCtx = new DefaultChannelHandlerContext(prev, next, newName, newHandler);
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callBeforeRemove(ctx);
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callBeforeAdd(newCtx);
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prev.next = newCtx;
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next.prev = newCtx;
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if (!sameName) {
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name2ctx.remove(ctx.getName());
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name2ctx.put(newName, newCtx);
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}
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ChannelHandlerLifeCycleException removeException = null;
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ChannelHandlerLifeCycleException addException = null;
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boolean removed = false;
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try {
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callAfterRemove(ctx);
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removed = true;
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} catch (ChannelHandlerLifeCycleException e) {
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removeException = e;
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}
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boolean added = false;
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try {
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callAfterAdd(newCtx);
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added = true;
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} catch (ChannelHandlerLifeCycleException e) {
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addException = e;
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}
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if (!removed && !added) {
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logger.warn(removeException.getMessage(), removeException);
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logger.warn(addException.getMessage(), addException);
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throw new ChannelHandlerLifeCycleException(
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"Both " + ctx.getHandler().getClass().getName() +
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".afterRemove() and " + newCtx.getHandler().getClass().getName() +
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".afterAdd() failed; see logs.");
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} else if (!removed) {
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throw removeException;
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} else if (!added) {
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throw addException;
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}
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}
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return ctx.getHandler();
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}
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private void callBeforeAdd(ChannelHandlerContext ctx) {
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if (!(ctx.getHandler() instanceof LifeCycleAwareChannelHandler)) {
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return;
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}
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LifeCycleAwareChannelHandler h =
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(LifeCycleAwareChannelHandler) ctx.getHandler();
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try {
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h.beforeAdd(ctx);
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} catch (Throwable t) {
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throw new ChannelHandlerLifeCycleException(
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h.getClass().getName() +
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".beforeAdd() has thrown an exception; not adding.", t);
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}
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}
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private void callAfterAdd(ChannelHandlerContext ctx) {
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if (!(ctx.getHandler() instanceof LifeCycleAwareChannelHandler)) {
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return;
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}
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LifeCycleAwareChannelHandler h =
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(LifeCycleAwareChannelHandler) ctx.getHandler();
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try {
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h.afterAdd(ctx);
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} catch (Throwable t) {
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boolean removed = false;
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try {
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remove((DefaultChannelHandlerContext) ctx);
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removed = true;
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} catch (Throwable t2) {
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logger.warn("Failed to remove a handler: " + ctx.getName(), t2);
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}
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if (removed) {
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throw new ChannelHandlerLifeCycleException(
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h.getClass().getName() +
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".afterAdd() has thrown an exception; removed.", t);
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} else {
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throw new ChannelHandlerLifeCycleException(
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h.getClass().getName() +
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".afterAdd() has thrown an exception; also failed to remove.", t);
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}
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}
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}
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private void callBeforeRemove(ChannelHandlerContext ctx) {
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if (!(ctx.getHandler() instanceof LifeCycleAwareChannelHandler)) {
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return;
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}
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LifeCycleAwareChannelHandler h =
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(LifeCycleAwareChannelHandler) ctx.getHandler();
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try {
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h.beforeRemove(ctx);
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} catch (Throwable t) {
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throw new ChannelHandlerLifeCycleException(
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h.getClass().getName() +
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".beforeRemove() has thrown an exception; not removing.", t);
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}
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}
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private void callAfterRemove(ChannelHandlerContext ctx) {
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if (!(ctx.getHandler() instanceof LifeCycleAwareChannelHandler)) {
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return;
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}
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LifeCycleAwareChannelHandler h =
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(LifeCycleAwareChannelHandler) ctx.getHandler();
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try {
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h.afterRemove(ctx);
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} catch (Throwable t) {
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throw new ChannelHandlerLifeCycleException(
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h.getClass().getName() +
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".afterRemove() has thrown an exception.", t);
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}
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}
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public synchronized ChannelHandler getFirst() {
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DefaultChannelHandlerContext head = this.head;
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if (head == null) {
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return null;
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}
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return head.getHandler();
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}
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public synchronized ChannelHandler getLast() {
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DefaultChannelHandlerContext tail = this.tail;
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if (tail == null) {
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return null;
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}
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return tail.getHandler();
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}
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public synchronized ChannelHandler get(String name) {
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DefaultChannelHandlerContext ctx = name2ctx.get(name);
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if (ctx == null) {
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return null;
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} else {
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return ctx.getHandler();
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}
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}
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@SuppressWarnings("unchecked")
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public synchronized <T extends ChannelHandler> T get(Class<T> handlerType) {
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ChannelHandlerContext ctx = getContext(handlerType);
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if (ctx == null) {
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return null;
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} else {
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return (T) ctx.getHandler();
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}
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}
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public synchronized ChannelHandlerContext getContext(String name) {
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if (name == null) {
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throw new NullPointerException("name");
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}
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return name2ctx.get(name);
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}
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public synchronized ChannelHandlerContext getContext(ChannelHandler handler) {
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if (handler == null) {
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throw new NullPointerException("handler");
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}
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if (name2ctx.isEmpty()) {
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return null;
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}
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DefaultChannelHandlerContext ctx = head;
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for (;;) {
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if (ctx.getHandler() == handler) {
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return ctx;
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}
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ctx = ctx.next;
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if (ctx == null) {
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break;
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}
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}
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return null;
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}
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public synchronized ChannelHandlerContext getContext(
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Class<? extends ChannelHandler> handlerType) {
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if (handlerType == null) {
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throw new NullPointerException("handlerType");
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}
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if (name2ctx.isEmpty()) {
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return null;
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}
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DefaultChannelHandlerContext ctx = head;
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for (;;) {
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if (handlerType.isAssignableFrom(ctx.getHandler().getClass())) {
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return ctx;
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}
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ctx = ctx.next;
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if (ctx == null) {
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break;
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}
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}
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return null;
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}
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public List<String> getNames() {
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List<String> list = new ArrayList<String>();
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if (name2ctx.isEmpty()) {
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return list;
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}
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DefaultChannelHandlerContext ctx = head;
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for (;;) {
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list.add(ctx.getName());
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ctx = ctx.next;
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if (ctx == null) {
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break;
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}
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}
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return list;
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}
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public Map<String, ChannelHandler> toMap() {
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Map<String, ChannelHandler> map = new LinkedHashMap<String, ChannelHandler>();
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if (name2ctx.isEmpty()) {
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return map;
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}
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DefaultChannelHandlerContext ctx = head;
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for (;;) {
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map.put(ctx.getName(), ctx.getHandler());
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ctx = ctx.next;
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if (ctx == null) {
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break;
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}
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}
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return map;
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}
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/**
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* Returns the {@link String} representation of this pipeline.
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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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buf.append(getClass().getSimpleName());
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buf.append('{');
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DefaultChannelHandlerContext ctx = head;
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for (;;) {
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buf.append('(');
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buf.append(ctx.getName());
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buf.append(" = ");
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buf.append(ctx.getHandler().getClass().getName());
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buf.append(')');
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ctx = ctx.next;
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if (ctx == null) {
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break;
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}
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buf.append(", ");
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}
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buf.append('}');
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return buf.toString();
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}
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public void sendUpstream(ChannelEvent e) {
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DefaultChannelHandlerContext head = getActualUpstreamContext(this.head);
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if (head == null) {
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logger.warn(
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"The pipeline contains no upstream handlers; discarding: " + e);
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return;
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}
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sendUpstream(head, e);
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}
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void sendUpstream(DefaultChannelHandlerContext ctx, ChannelEvent e) {
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try {
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((ChannelUpstreamHandler) ctx.getHandler()).handleUpstream(ctx, e);
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} catch (Throwable t) {
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notifyHandlerException(e, t);
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}
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}
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public void sendDownstream(ChannelEvent e) {
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DefaultChannelHandlerContext tail = getActualDownstreamContext(this.tail);
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if (tail == null) {
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try {
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getSink().eventSunk(this, e);
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return;
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} catch (Throwable t) {
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notifyHandlerException(e, t);
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return;
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}
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}
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sendDownstream(tail, e);
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}
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void sendDownstream(DefaultChannelHandlerContext ctx, ChannelEvent e) {
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if (e instanceof UpstreamMessageEvent) {
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throw new IllegalArgumentException("cannot send an upstream event to downstream");
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}
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try {
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((ChannelDownstreamHandler) ctx.getHandler()).handleDownstream(ctx, e);
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} catch (Throwable t) {
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// Unlike an upstream event, a downstream event usually has an
|
|
// incomplete future which is supposed to be updated by ChannelSink.
|
|
// However, if an exception is raised before the event reaches at
|
|
// ChannelSink, the future is not going to be updated, so we update
|
|
// here.
|
|
e.getFuture().setFailure(t);
|
|
notifyHandlerException(e, t);
|
|
}
|
|
}
|
|
|
|
DefaultChannelHandlerContext getActualUpstreamContext(DefaultChannelHandlerContext ctx) {
|
|
if (ctx == null) {
|
|
return null;
|
|
}
|
|
|
|
DefaultChannelHandlerContext realCtx = ctx;
|
|
while (!realCtx.canHandleUpstream()) {
|
|
realCtx = realCtx.next;
|
|
if (realCtx == null) {
|
|
return null;
|
|
}
|
|
}
|
|
|
|
return realCtx;
|
|
}
|
|
|
|
DefaultChannelHandlerContext getActualDownstreamContext(DefaultChannelHandlerContext ctx) {
|
|
if (ctx == null) {
|
|
return null;
|
|
}
|
|
|
|
DefaultChannelHandlerContext realCtx = ctx;
|
|
while (!realCtx.canHandleDownstream()) {
|
|
realCtx = realCtx.prev;
|
|
if (realCtx == null) {
|
|
return null;
|
|
}
|
|
}
|
|
|
|
return realCtx;
|
|
}
|
|
|
|
protected void notifyHandlerException(ChannelEvent e, Throwable t) {
|
|
if (e instanceof ExceptionEvent) {
|
|
logger.warn(
|
|
"An exception was thrown by a user handler " +
|
|
"while handling an exception event (" + e + ")", t);
|
|
return;
|
|
}
|
|
|
|
ChannelPipelineException pe;
|
|
if (t instanceof ChannelPipelineException) {
|
|
pe = (ChannelPipelineException) t;
|
|
} else {
|
|
pe = new ChannelPipelineException(t);
|
|
}
|
|
|
|
try {
|
|
sink.exceptionCaught(this, e, pe);
|
|
} catch (Exception e1) {
|
|
logger.warn("An exception was thrown by an exception handler.", e1);
|
|
}
|
|
}
|
|
|
|
private void init(String name, ChannelHandler handler) {
|
|
DefaultChannelHandlerContext ctx = new DefaultChannelHandlerContext(null, null, name, handler);
|
|
callBeforeAdd(ctx);
|
|
head = tail = ctx;
|
|
name2ctx.clear();
|
|
name2ctx.put(name, ctx);
|
|
callAfterAdd(ctx);
|
|
}
|
|
|
|
private void checkDuplicateName(String name) {
|
|
if (name2ctx.containsKey(name)) {
|
|
throw new IllegalArgumentException("Duplicate handler name: " + name);
|
|
}
|
|
}
|
|
|
|
private DefaultChannelHandlerContext getContextOrDie(String name) {
|
|
DefaultChannelHandlerContext ctx = (DefaultChannelHandlerContext) getContext(name);
|
|
if (ctx == null) {
|
|
throw new NoSuchElementException(name);
|
|
} else {
|
|
return ctx;
|
|
}
|
|
}
|
|
|
|
private DefaultChannelHandlerContext getContextOrDie(ChannelHandler handler) {
|
|
DefaultChannelHandlerContext ctx = (DefaultChannelHandlerContext) getContext(handler);
|
|
if (ctx == null) {
|
|
throw new NoSuchElementException(handler.getClass().getName());
|
|
} else {
|
|
return ctx;
|
|
}
|
|
}
|
|
|
|
private DefaultChannelHandlerContext getContextOrDie(Class<? extends ChannelHandler> handlerType) {
|
|
DefaultChannelHandlerContext ctx = (DefaultChannelHandlerContext) getContext(handlerType);
|
|
if (ctx == null) {
|
|
throw new NoSuchElementException(handlerType.getName());
|
|
} else {
|
|
return ctx;
|
|
}
|
|
}
|
|
|
|
private final class DefaultChannelHandlerContext implements ChannelHandlerContext {
|
|
volatile DefaultChannelHandlerContext next;
|
|
volatile DefaultChannelHandlerContext prev;
|
|
private final String name;
|
|
private final ChannelHandler handler;
|
|
private final boolean canHandleUpstream;
|
|
private final boolean canHandleDownstream;
|
|
private volatile Object attachment;
|
|
|
|
DefaultChannelHandlerContext(
|
|
DefaultChannelHandlerContext prev, DefaultChannelHandlerContext next,
|
|
String name, ChannelHandler handler) {
|
|
|
|
if (name == null) {
|
|
throw new NullPointerException("name");
|
|
}
|
|
if (handler == null) {
|
|
throw new NullPointerException("handler");
|
|
}
|
|
canHandleUpstream = handler instanceof ChannelUpstreamHandler;
|
|
canHandleDownstream = handler instanceof ChannelDownstreamHandler;
|
|
|
|
|
|
if (!canHandleUpstream && !canHandleDownstream) {
|
|
throw new IllegalArgumentException(
|
|
"handler must be either " +
|
|
ChannelUpstreamHandler.class.getName() + " or " +
|
|
ChannelDownstreamHandler.class.getName() + '.');
|
|
}
|
|
|
|
this.prev = prev;
|
|
this.next = next;
|
|
this.name = name;
|
|
this.handler = handler;
|
|
}
|
|
|
|
public Channel getChannel() {
|
|
return getPipeline().getChannel();
|
|
}
|
|
|
|
public ChannelPipeline getPipeline() {
|
|
return DefaultChannelPipeline.this;
|
|
}
|
|
|
|
public boolean canHandleDownstream() {
|
|
return canHandleDownstream;
|
|
}
|
|
|
|
public boolean canHandleUpstream() {
|
|
return canHandleUpstream;
|
|
}
|
|
|
|
public ChannelHandler getHandler() {
|
|
return handler;
|
|
}
|
|
|
|
public String getName() {
|
|
return name;
|
|
}
|
|
|
|
public Object getAttachment() {
|
|
return attachment;
|
|
}
|
|
|
|
public void setAttachment(Object attachment) {
|
|
this.attachment = attachment;
|
|
}
|
|
|
|
public void sendDownstream(ChannelEvent e) {
|
|
DefaultChannelHandlerContext prev = getActualDownstreamContext(this.prev);
|
|
if (prev == null) {
|
|
try {
|
|
getSink().eventSunk(DefaultChannelPipeline.this, e);
|
|
} catch (Throwable t) {
|
|
notifyHandlerException(e, t);
|
|
}
|
|
} else {
|
|
DefaultChannelPipeline.this.sendDownstream(prev, e);
|
|
}
|
|
}
|
|
|
|
public void sendUpstream(ChannelEvent e) {
|
|
DefaultChannelHandlerContext next = getActualUpstreamContext(this.next);
|
|
if (next != null) {
|
|
DefaultChannelPipeline.this.sendUpstream(next, e);
|
|
}
|
|
}
|
|
}
|
|
|
|
private static final class DiscardingChannelSink implements ChannelSink {
|
|
DiscardingChannelSink() {
|
|
super();
|
|
}
|
|
|
|
public void eventSunk(ChannelPipeline pipeline, ChannelEvent e) {
|
|
logger.warn("Not attached yet; discarding: " + e);
|
|
}
|
|
|
|
public void exceptionCaught(ChannelPipeline pipeline,
|
|
ChannelEvent e, ChannelPipelineException cause) throws Exception {
|
|
throw cause;
|
|
}
|
|
}
|
|
}
|