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/*
* Copyright 2012 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.channel;
import io.netty.channel.Channel.Unsafe;
import io.netty.util.ReferenceCountUtil;
import io.netty.util.ResourceLeakDetector;
import io.netty.util.concurrent.EventExecutor;
import io.netty.util.concurrent.EventExecutorGroup;
import io.netty.util.concurrent.FastThreadLocal;
import io.netty.util.internal.ObjectUtil;
import io.netty.util.internal.StringUtil;
import io.netty.util.internal.UnstableApi;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;
import java.net.SocketAddress;
import java.util.ArrayList;
import java.util.IdentityHashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.WeakHashMap;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
/**
* The default {@link ChannelPipeline} implementation. It is usually created
* by a {@link Channel} implementation when the {@link Channel} is created.
*/
public class DefaultChannelPipeline implements ChannelPipeline {
static final InternalLogger logger = InternalLoggerFactory.getInstance(DefaultChannelPipeline.class);
private static final String HEAD_NAME = generateName0(HeadContext.class);
private static final String TAIL_NAME = generateName0(TailContext.class);
private static final FastThreadLocal, String>> nameCaches =
new FastThreadLocal, String>>() {
@Override
protected Map, String> initialValue() {
return new WeakHashMap, String>();
}
};
private static final AtomicReferenceFieldUpdater ESTIMATOR =
AtomicReferenceFieldUpdater.newUpdater(
DefaultChannelPipeline.class, MessageSizeEstimator.Handle.class, "estimatorHandle");
final HeadContext head;
final TailContext tail;
private final Channel channel;
private final ChannelFuture succeededFuture;
private final VoidChannelPromise voidPromise;
private final boolean touch = ResourceLeakDetector.isEnabled();
private Map childExecutors;
private volatile MessageSizeEstimator.Handle estimatorHandle;
private boolean firstRegistration = true;
/**
* This is the head of a linked list that is processed by {@link #callHandlerAddedForAllHandlers()} and so process
* all the pending {@link #callHandlerAdded0(AbstractChannelHandlerContext)}.
*
* We only keep the head because it is expected that the list is used infrequently and its size is small.
* Thus full iterations to do insertions is assumed to be a good compromised to saving memory and tail management
* complexity.
*/
private PendingHandlerCallback pendingHandlerCallbackHead;
/**
* Set to {@code true} once the {@link AbstractChannel} is registered.Once set to {@code true} the value will never
* change.
*/
private boolean registered;
protected DefaultChannelPipeline(Channel channel) {
this.channel = ObjectUtil.checkNotNull(channel, "channel");
succeededFuture = new SucceededChannelFuture(channel, null);
voidPromise = new VoidChannelPromise(channel, true);
tail = new TailContext(this);
head = new HeadContext(this);
head.next = tail;
tail.prev = head;
}
final MessageSizeEstimator.Handle estimatorHandle() {
MessageSizeEstimator.Handle handle = estimatorHandle;
if (handle == null) {
handle = channel.config().getMessageSizeEstimator().newHandle();
if (!ESTIMATOR.compareAndSet(this, null, handle)) {
handle = estimatorHandle;
}
}
return handle;
}
final Object touch(Object msg, AbstractChannelHandlerContext next) {
return touch ? ReferenceCountUtil.touch(msg, next) : msg;
}
private AbstractChannelHandlerContext newContext(EventExecutorGroup group, String name, ChannelHandler handler) {
return new DefaultChannelHandlerContext(this, childExecutor(group), name, handler);
}
private EventExecutor childExecutor(EventExecutorGroup group) {
if (group == null) {
return null;
}
Boolean pinEventExecutor = channel.config().getOption(ChannelOption.SINGLE_EVENTEXECUTOR_PER_GROUP);
if (pinEventExecutor != null && !pinEventExecutor) {
return group.next();
}
Map childExecutors = this.childExecutors;
if (childExecutors == null) {
// Use size of 4 as most people only use one extra EventExecutor.
childExecutors = this.childExecutors = new IdentityHashMap(4);
}
// Pin one of the child executors once and remember it so that the same child executor
// is used to fire events for the same channel.
EventExecutor childExecutor = childExecutors.get(group);
if (childExecutor == null) {
childExecutor = group.next();
childExecutors.put(group, childExecutor);
}
return childExecutor;
}
@Override
public final Channel channel() {
return channel;
}
@Override
public final ChannelPipeline addFirst(String name, ChannelHandler handler) {
return addFirst(null, name, handler);
}
@Override
public final ChannelPipeline addFirst(EventExecutorGroup group, String name, ChannelHandler handler) {
final AbstractChannelHandlerContext newCtx;
synchronized (this) {
checkMultiplicity(handler);
name = filterName(name, handler);
newCtx = newContext(group, name, handler);
addFirst0(newCtx);
// If the registered is false it means that the channel was not registered on an eventLoop yet.
// In this case we add the context to the pipeline and add a task that will call
// ChannelHandler.handlerAdded(...) once the channel is registered.
if (!registered) {
newCtx.setAddPending();
callHandlerCallbackLater(newCtx, true);
return this;
}
EventExecutor executor = newCtx.executor();
if (!executor.inEventLoop()) {
callHandlerAddedInEventLoop(newCtx, executor);
return this;
}
}
callHandlerAdded0(newCtx);
return this;
}
private void addFirst0(AbstractChannelHandlerContext newCtx) {
AbstractChannelHandlerContext nextCtx = head.next;
newCtx.prev = head;
newCtx.next = nextCtx;
head.next = newCtx;
nextCtx.prev = newCtx;
}
@Override
public final ChannelPipeline addLast(String name, ChannelHandler handler) {
return addLast(null, name, handler);
}
@Override
public final ChannelPipeline addLast(EventExecutorGroup group, String name, ChannelHandler handler) {
final AbstractChannelHandlerContext newCtx;
synchronized (this) {
checkMultiplicity(handler);
newCtx = newContext(group, filterName(name, handler), handler);
addLast0(newCtx);
// If the registered is false it means that the channel was not registered on an eventLoop yet.
// In this case we add the context to the pipeline and add a task that will call
// ChannelHandler.handlerAdded(...) once the channel is registered.
if (!registered) {
newCtx.setAddPending();
callHandlerCallbackLater(newCtx, true);
return this;
}
EventExecutor executor = newCtx.executor();
if (!executor.inEventLoop()) {
callHandlerAddedInEventLoop(newCtx, executor);
return this;
}
}
callHandlerAdded0(newCtx);
return this;
}
private void addLast0(AbstractChannelHandlerContext newCtx) {
AbstractChannelHandlerContext prev = tail.prev;
newCtx.prev = prev;
newCtx.next = tail;
prev.next = newCtx;
tail.prev = newCtx;
}
@Override
public final ChannelPipeline addBefore(String baseName, String name, ChannelHandler handler) {
return addBefore(null, baseName, name, handler);
}
@Override
public final ChannelPipeline addBefore(
EventExecutorGroup group, String baseName, String name, ChannelHandler handler) {
final AbstractChannelHandlerContext newCtx;
final AbstractChannelHandlerContext ctx;
synchronized (this) {
checkMultiplicity(handler);
name = filterName(name, handler);
ctx = getContextOrDie(baseName);
newCtx = newContext(group, name, handler);
addBefore0(ctx, newCtx);
// If the registered is false it means that the channel was not registered on an eventLoop yet.
// In this case we add the context to the pipeline and add a task that will call
// ChannelHandler.handlerAdded(...) once the channel is registered.
if (!registered) {
newCtx.setAddPending();
callHandlerCallbackLater(newCtx, true);
return this;
}
EventExecutor executor = newCtx.executor();
if (!executor.inEventLoop()) {
callHandlerAddedInEventLoop(newCtx, executor);
return this;
}
}
callHandlerAdded0(newCtx);
return this;
}
private static void addBefore0(AbstractChannelHandlerContext ctx, AbstractChannelHandlerContext newCtx) {
newCtx.prev = ctx.prev;
newCtx.next = ctx;
ctx.prev.next = newCtx;
ctx.prev = newCtx;
}
private String filterName(String name, ChannelHandler handler) {
if (name == null) {
return generateName(handler);
}
checkDuplicateName(name);
return name;
}
@Override
public final ChannelPipeline addAfter(String baseName, String name, ChannelHandler handler) {
return addAfter(null, baseName, name, handler);
}
@Override
public final ChannelPipeline addAfter(
EventExecutorGroup group, String baseName, String name, ChannelHandler handler) {
final AbstractChannelHandlerContext newCtx;
final AbstractChannelHandlerContext ctx;
synchronized (this) {
checkMultiplicity(handler);
name = filterName(name, handler);
ctx = getContextOrDie(baseName);
newCtx = newContext(group, name, handler);
addAfter0(ctx, newCtx);
// If the registered is false it means that the channel was not registered on an eventLoop yet.
// In this case we remove the context from the pipeline and add a task that will call
// ChannelHandler.handlerRemoved(...) once the channel is registered.
if (!registered) {
newCtx.setAddPending();
callHandlerCallbackLater(newCtx, true);
return this;
}
EventExecutor executor = newCtx.executor();
if (!executor.inEventLoop()) {
callHandlerAddedInEventLoop(newCtx, executor);
return this;
}
}
callHandlerAdded0(newCtx);
return this;
}
private static void addAfter0(AbstractChannelHandlerContext ctx, AbstractChannelHandlerContext newCtx) {
newCtx.prev = ctx;
newCtx.next = ctx.next;
ctx.next.prev = newCtx;
ctx.next = newCtx;
}
public final ChannelPipeline addFirst(ChannelHandler handler) {
return addFirst(null, handler);
}
@Override
public final ChannelPipeline addFirst(ChannelHandler... handlers) {
return addFirst(null, handlers);
}
@Override
public final ChannelPipeline addFirst(EventExecutorGroup executor, ChannelHandler... handlers) {
ObjectUtil.checkNotNull(handlers, "handlers");
if (handlers.length == 0 || handlers[0] == null) {
return this;
}
int size;
for (size = 1; size < handlers.length; size ++) {
if (handlers[size] == null) {
break;
}
}
for (int i = size - 1; i >= 0; i --) {
ChannelHandler h = handlers[i];
addFirst(executor, null, h);
}
return this;
}
public final ChannelPipeline addLast(ChannelHandler handler) {
return addLast(null, handler);
}
@Override
public final ChannelPipeline addLast(ChannelHandler... handlers) {
return addLast(null, handlers);
}
@Override
public final ChannelPipeline addLast(EventExecutorGroup executor, ChannelHandler... handlers) {
ObjectUtil.checkNotNull(handlers, "handlers");
for (ChannelHandler h: handlers) {
if (h == null) {
break;
}
addLast(executor, null, h);
}
return this;
}
private String generateName(ChannelHandler handler) {
Map, String> cache = nameCaches.get();
Class handlerType = handler.getClass();
String name = cache.get(handlerType);
if (name == null) {
name = generateName0(handlerType);
cache.put(handlerType, name);
}
// It's not very likely for a user to put more than one handler of the same type, but make sure to avoid
// any name conflicts. Note that we don't cache the names generated here.
if (context0(name) != null) {
String baseName = name.substring(0, name.length() - 1); // Strip the trailing '0'.
for (int i = 1;; i ++) {
String newName = baseName + i;
if (context0(newName) == null) {
name = newName;
break;
}
}
}
return name;
}
private static String generateName0(Class handlerType) {
return StringUtil.simpleClassName(handlerType) + "#0";
}
@Override
public final ChannelPipeline remove(ChannelHandler handler) {
remove(getContextOrDie(handler));
return this;
}
@Override
public final ChannelHandler remove(String name) {
return remove(getContextOrDie(name)).handler();
}
@SuppressWarnings("unchecked")
@Override
public final T remove(Class handlerType) {
return (T) remove(getContextOrDie(handlerType)).handler();
}
public final T removeIfExists(String name) {
return removeIfExists(context(name));
}
public final T removeIfExists(Class handlerType) {
return removeIfExists(context(handlerType));
}
public final T removeIfExists(ChannelHandler handler) {
return removeIfExists(context(handler));
}
@SuppressWarnings("unchecked")
private T removeIfExists(ChannelHandlerContext ctx) {
if (ctx == null) {
return null;
}
return (T) remove((AbstractChannelHandlerContext) ctx).handler();
}
private AbstractChannelHandlerContext remove(final AbstractChannelHandlerContext ctx) {
assert ctx != head && ctx != tail;
synchronized (this) {
atomicRemoveFromHandlerList(ctx);
// If the registered is false it means that the channel was not registered on an eventloop yet.
// In this case we remove the context from the pipeline and add a task that will call
// ChannelHandler.handlerRemoved(...) once the channel is registered.
if (!registered) {
callHandlerCallbackLater(ctx, false);
return ctx;
}
EventExecutor executor = ctx.executor();
if (!executor.inEventLoop()) {
executor.execute(new Runnable() {
@Override
public void run() {
callHandlerRemoved0(ctx);
}
});
return ctx;
}
}
callHandlerRemoved0(ctx);
return ctx;
}
/**
* Method is synchronized to make the handler removal from the double linked list atomic.
*/
private synchronized void atomicRemoveFromHandlerList(AbstractChannelHandlerContext ctx) {
AbstractChannelHandlerContext prev = ctx.prev;
AbstractChannelHandlerContext next = ctx.next;
prev.next = next;
next.prev = prev;
}
@Override
public final ChannelHandler removeFirst() {
if (head.next == tail) {
throw new NoSuchElementException();
}
return remove(head.next).handler();
}
@Override
public final ChannelHandler removeLast() {
if (head.next == tail) {
throw new NoSuchElementException();
}
return remove(tail.prev).handler();
}
@Override
public final ChannelPipeline replace(ChannelHandler oldHandler, String newName, ChannelHandler newHandler) {
replace(getContextOrDie(oldHandler), newName, newHandler);
return this;
}
@Override
public final ChannelHandler replace(String oldName, String newName, ChannelHandler newHandler) {
return replace(getContextOrDie(oldName), newName, newHandler);
}
@Override
@SuppressWarnings("unchecked")
public final T replace(
Class oldHandlerType, String newName, ChannelHandler newHandler) {
return (T) replace(getContextOrDie(oldHandlerType), newName, newHandler);
}
private ChannelHandler replace(
final AbstractChannelHandlerContext ctx, String newName, ChannelHandler newHandler) {
assert ctx != head && ctx != tail;
final AbstractChannelHandlerContext newCtx;
synchronized (this) {
checkMultiplicity(newHandler);
if (newName == null) {
newName = generateName(newHandler);
} else {
boolean sameName = ctx.name().equals(newName);
if (!sameName) {
checkDuplicateName(newName);
}
}
newCtx = newContext(ctx.executor, newName, newHandler);
replace0(ctx, newCtx);
// If the registered is false it means that the channel was not registered on an eventloop yet.
// In this case we replace the context in the pipeline
// and add a task that will call ChannelHandler.handlerAdded(...) and
// ChannelHandler.handlerRemoved(...) once the channel is registered.
if (!registered) {
callHandlerCallbackLater(newCtx, true);
callHandlerCallbackLater(ctx, false);
return ctx.handler();
}
EventExecutor executor = ctx.executor();
if (!executor.inEventLoop()) {
executor.execute(new Runnable() {
@Override
public void run() {
// Invoke newHandler.handlerAdded() first (i.e. before oldHandler.handlerRemoved() is invoked)
// because callHandlerRemoved() will trigger channelRead() or flush() on newHandler and
// those event handlers must be called after handlerAdded().
callHandlerAdded0(newCtx);
callHandlerRemoved0(ctx);
}
});
return ctx.handler();
}
}
// Invoke newHandler.handlerAdded() first (i.e. before oldHandler.handlerRemoved() is invoked)
// because callHandlerRemoved() will trigger channelRead() or flush() on newHandler and those
// event handlers must be called after handlerAdded().
callHandlerAdded0(newCtx);
callHandlerRemoved0(ctx);
return ctx.handler();
}
private static void replace0(AbstractChannelHandlerContext oldCtx, AbstractChannelHandlerContext newCtx) {
AbstractChannelHandlerContext prev = oldCtx.prev;
AbstractChannelHandlerContext next = oldCtx.next;
newCtx.prev = prev;
newCtx.next = next;
// Finish the replacement of oldCtx with newCtx in the linked list.
// Note that this doesn't mean events will be sent to the new handler immediately
// because we are currently at the event handler thread and no more than one handler methods can be invoked
// at the same time (we ensured that in replace().)
prev.next = newCtx;
next.prev = newCtx;
// update the reference to the replacement so forward of buffered content will work correctly
oldCtx.prev = newCtx;
oldCtx.next = newCtx;
}
private static void checkMultiplicity(ChannelHandler handler) {
if (handler instanceof ChannelHandlerAdapter) {
ChannelHandlerAdapter h = (ChannelHandlerAdapter) handler;
if (!h.isSharable() && h.added) {
throw new ChannelPipelineException(
h.getClass().getName() +
" is not a @Sharable handler, so can't be added or removed multiple times.");
}
h.added = true;
}
}
private void callHandlerAdded0(final AbstractChannelHandlerContext ctx) {
try {
ctx.callHandlerAdded();
} catch (Throwable t) {
boolean removed = false;
try {
atomicRemoveFromHandlerList(ctx);
ctx.callHandlerRemoved();
removed = true;
} catch (Throwable t2) {
if (logger.isWarnEnabled()) {
logger.warn("Failed to remove a handler: " + ctx.name(), t2);
}
}
if (removed) {
fireExceptionCaught(new ChannelPipelineException(
ctx.handler().getClass().getName() +
".handlerAdded() has thrown an exception; removed.", t));
} else {
fireExceptionCaught(new ChannelPipelineException(
ctx.handler().getClass().getName() +
".handlerAdded() has thrown an exception; also failed to remove.", t));
}
}
}
private void callHandlerRemoved0(final AbstractChannelHandlerContext ctx) {
// Notify the complete removal.
try {
ctx.callHandlerRemoved();
} catch (Throwable t) {
fireExceptionCaught(new ChannelPipelineException(
ctx.handler().getClass().getName() + ".handlerRemoved() has thrown an exception.", t));
}
}
final void invokeHandlerAddedIfNeeded() {
assert channel.eventLoop().inEventLoop();
if (firstRegistration) {
firstRegistration = false;
// We are now registered to the EventLoop. It's time to call the callbacks for the ChannelHandlers,
// that were added before the registration was done.
callHandlerAddedForAllHandlers();
}
}
@Override
public final ChannelHandler first() {
ChannelHandlerContext first = firstContext();
if (first == null) {
return null;
}
return first.handler();
}
@Override
public final ChannelHandlerContext firstContext() {
AbstractChannelHandlerContext first = head.next;
if (first == tail) {
return null;
}
return head.next;
}
@Override
public final ChannelHandler last() {
AbstractChannelHandlerContext last = tail.prev;
if (last == head) {
return null;
}
return last.handler();
}
@Override
public final ChannelHandlerContext lastContext() {
AbstractChannelHandlerContext last = tail.prev;
if (last == head) {
return null;
}
return last;
}
@Override
public final ChannelHandler get(String name) {
ChannelHandlerContext ctx = context(name);
if (ctx == null) {
return null;
} else {
return ctx.handler();
}
}
@SuppressWarnings("unchecked")
@Override
public final T get(Class handlerType) {
ChannelHandlerContext ctx = context(handlerType);
if (ctx == null) {
return null;
} else {
return (T) ctx.handler();
}
}
@Override
public final ChannelHandlerContext context(String name) {
return context0(ObjectUtil.checkNotNull(name, "name"));
}
@Override
public final ChannelHandlerContext context(ChannelHandler handler) {
ObjectUtil.checkNotNull(handler, "handler");
AbstractChannelHandlerContext ctx = head.next;
for (;;) {
if (ctx == null) {
return null;
}
if (ctx.handler() == handler) {
return ctx;
}
ctx = ctx.next;
}
}
@Override
public final ChannelHandlerContext context(Class handlerType) {
ObjectUtil.checkNotNull(handlerType, "handlerType");
AbstractChannelHandlerContext ctx = head.next;
for (;;) {
if (ctx == null) {
return null;
}
if (handlerType.isAssignableFrom(ctx.handler().getClass())) {
return ctx;
}
ctx = ctx.next;
}
}
@Override
public final List names() {
List list = new ArrayList();
AbstractChannelHandlerContext ctx = head.next;
for (;;) {
if (ctx == null) {
return list;
}
list.add(ctx.name());
ctx = ctx.next;
}
}
@Override
public final Map toMap() {
Map map = new LinkedHashMap();
AbstractChannelHandlerContext ctx = head.next;
for (;;) {
if (ctx == tail) {
return map;
}
map.put(ctx.name(), ctx.handler());
ctx = ctx.next;
}
}
@Override
public final Iterator> iterator() {
return toMap().entrySet().iterator();
}
/**
* Returns the {@link String} representation of this pipeline.
*/
@Override
public final String toString() {
StringBuilder buf = new StringBuilder()
.append(StringUtil.simpleClassName(this))
.append('{');
AbstractChannelHandlerContext ctx = head.next;
for (;;) {
if (ctx == tail) {
break;
}
buf.append('(')
.append(ctx.name())
.append(" = ")
.append(ctx.handler().getClass().getName())
.append(')');
ctx = ctx.next;
if (ctx == tail) {
break;
}
buf.append(", ");
}
buf.append('}');
return buf.toString();
}
@Override
public final ChannelPipeline fireChannelRegistered() {
AbstractChannelHandlerContext.invokeChannelRegistered(head);
return this;
}
@Override
public final ChannelPipeline fireChannelUnregistered() {
AbstractChannelHandlerContext.invokeChannelUnregistered(head);
return this;
}
/**
* Removes all handlers from the pipeline one by one from tail (exclusive) to head (exclusive) to trigger
* handlerRemoved().
*
* Note that we traverse up the pipeline ({@link #destroyUp(AbstractChannelHandlerContext, boolean)})
* before traversing down ({@link #destroyDown(Thread, AbstractChannelHandlerContext, boolean)}) so that
* the handlers are removed after all events are handled.
*
* See: https://github.com/netty/netty/issues/3156
*/
private synchronized void destroy() {
destroyUp(head.next, false);
}
private void destroyUp(AbstractChannelHandlerContext ctx, boolean inEventLoop) {
final Thread currentThread = Thread.currentThread();
final AbstractChannelHandlerContext tail = this.tail;
for (;;) {
if (ctx == tail) {
destroyDown(currentThread, tail.prev, inEventLoop);
break;
}
final EventExecutor executor = ctx.executor();
if (!inEventLoop && !executor.inEventLoop(currentThread)) {
final AbstractChannelHandlerContext finalCtx = ctx;
executor.execute(new Runnable() {
@Override
public void run() {
destroyUp(finalCtx, true);
}
});
break;
}
ctx = ctx.next;
inEventLoop = false;
}
}
private void destroyDown(Thread currentThread, AbstractChannelHandlerContext ctx, boolean inEventLoop) {
// We have reached at tail; now traverse backwards.
final AbstractChannelHandlerContext head = this.head;
for (;;) {
if (ctx == head) {
break;
}
final EventExecutor executor = ctx.executor();
if (inEventLoop || executor.inEventLoop(currentThread)) {
atomicRemoveFromHandlerList(ctx);
callHandlerRemoved0(ctx);
} else {
final AbstractChannelHandlerContext finalCtx = ctx;
executor.execute(new Runnable() {
@Override
public void run() {
destroyDown(Thread.currentThread(), finalCtx, true);
}
});
break;
}
ctx = ctx.prev;
inEventLoop = false;
}
}
@Override
public final ChannelPipeline fireChannelActive() {
AbstractChannelHandlerContext.invokeChannelActive(head);
return this;
}
@Override
public final ChannelPipeline fireChannelInactive() {
AbstractChannelHandlerContext.invokeChannelInactive(head);
return this;
}
@Override
public final ChannelPipeline fireExceptionCaught(Throwable cause) {
AbstractChannelHandlerContext.invokeExceptionCaught(head, cause);
return this;
}
@Override
public final ChannelPipeline fireUserEventTriggered(Object event) {
AbstractChannelHandlerContext.invokeUserEventTriggered(head, event);
return this;
}
@Override
public final ChannelPipeline fireChannelRead(Object msg) {
AbstractChannelHandlerContext.invokeChannelRead(head, msg);
return this;
}
@Override
public final ChannelPipeline fireChannelReadComplete() {
AbstractChannelHandlerContext.invokeChannelReadComplete(head);
return this;
}
@Override
public final ChannelPipeline fireChannelWritabilityChanged() {
AbstractChannelHandlerContext.invokeChannelWritabilityChanged(head);
return this;
}
@Override
public final ChannelFuture bind(SocketAddress localAddress) {
return tail.bind(localAddress);
}
@Override
public final ChannelFuture connect(SocketAddress remoteAddress) {
return tail.connect(remoteAddress);
}
@Override
public final ChannelFuture connect(SocketAddress remoteAddress, SocketAddress localAddress) {
return tail.connect(remoteAddress, localAddress);
}
@Override
public final ChannelFuture disconnect() {
return tail.disconnect();
}
@Override
public final ChannelFuture close() {
return tail.close();
}
@Override
public final ChannelFuture deregister() {
return tail.deregister();
}
@Override
public final ChannelPipeline flush() {
tail.flush();
return this;
}
@Override
public final ChannelFuture bind(SocketAddress localAddress, ChannelPromise promise) {
return tail.bind(localAddress, promise);
}
@Override
public final ChannelFuture connect(SocketAddress remoteAddress, ChannelPromise promise) {
return tail.connect(remoteAddress, promise);
}
@Override
public final ChannelFuture connect(
SocketAddress remoteAddress, SocketAddress localAddress, ChannelPromise promise) {
return tail.connect(remoteAddress, localAddress, promise);
}
@Override
public final ChannelFuture disconnect(ChannelPromise promise) {
return tail.disconnect(promise);
}
@Override
public final ChannelFuture close(ChannelPromise promise) {
return tail.close(promise);
}
@Override
public final ChannelFuture deregister(final ChannelPromise promise) {
return tail.deregister(promise);
}
@Override
public final ChannelPipeline read() {
tail.read();
return this;
}
@Override
public final ChannelFuture write(Object msg) {
return tail.write(msg);
}
@Override
public final ChannelFuture write(Object msg, ChannelPromise promise) {
return tail.write(msg, promise);
}
@Override
public final ChannelFuture writeAndFlush(Object msg, ChannelPromise promise) {
return tail.writeAndFlush(msg, promise);
}
@Override
public final ChannelFuture writeAndFlush(Object msg) {
return tail.writeAndFlush(msg);
}
@Override
public final ChannelPromise newPromise() {
return new DefaultChannelPromise(channel);
}
@Override
public final ChannelProgressivePromise newProgressivePromise() {
return new DefaultChannelProgressivePromise(channel);
}
@Override
public final ChannelFuture newSucceededFuture() {
return succeededFuture;
}
@Override
public final ChannelFuture newFailedFuture(Throwable cause) {
return new FailedChannelFuture(channel, null, cause);
}
@Override
public final ChannelPromise voidPromise() {
return voidPromise;
}
private void checkDuplicateName(String name) {
if (context0(name) != null) {
throw new IllegalArgumentException("Duplicate handler name: " + name);
}
}
private AbstractChannelHandlerContext context0(String name) {
AbstractChannelHandlerContext context = head.next;
while (context != tail) {
if (context.name().equals(name)) {
return context;
}
context = context.next;
}
return null;
}
private AbstractChannelHandlerContext getContextOrDie(String name) {
AbstractChannelHandlerContext ctx = (AbstractChannelHandlerContext) context(name);
if (ctx == null) {
throw new NoSuchElementException(name);
} else {
return ctx;
}
}
private AbstractChannelHandlerContext getContextOrDie(ChannelHandler handler) {
AbstractChannelHandlerContext ctx = (AbstractChannelHandlerContext) context(handler);
if (ctx == null) {
throw new NoSuchElementException(handler.getClass().getName());
} else {
return ctx;
}
}
private AbstractChannelHandlerContext getContextOrDie(Class handlerType) {
AbstractChannelHandlerContext ctx = (AbstractChannelHandlerContext) context(handlerType);
if (ctx == null) {
throw new NoSuchElementException(handlerType.getName());
} else {
return ctx;
}
}
private void callHandlerAddedForAllHandlers() {
final PendingHandlerCallback pendingHandlerCallbackHead;
synchronized (this) {
assert !registered;
// This Channel itself was registered.
registered = true;
pendingHandlerCallbackHead = this.pendingHandlerCallbackHead;
// Null out so it can be GC'ed.
this.pendingHandlerCallbackHead = null;
}
// This must happen outside of the synchronized(...) block as otherwise handlerAdded(...) may be called while
// holding the lock and so produce a deadlock if handlerAdded(...) will try to add another handler from outside
// the EventLoop.
PendingHandlerCallback task = pendingHandlerCallbackHead;
while (task != null) {
task.execute();
task = task.next;
}
}
private void callHandlerCallbackLater(AbstractChannelHandlerContext ctx, boolean added) {
assert !registered;
PendingHandlerCallback task = added ? new PendingHandlerAddedTask(ctx) : new PendingHandlerRemovedTask(ctx);
PendingHandlerCallback pending = pendingHandlerCallbackHead;
if (pending == null) {
pendingHandlerCallbackHead = task;
} else {
// Find the tail of the linked-list.
while (pending.next != null) {
pending = pending.next;
}
pending.next = task;
}
}
private void callHandlerAddedInEventLoop(final AbstractChannelHandlerContext newCtx, EventExecutor executor) {
newCtx.setAddPending();
executor.execute(new Runnable() {
@Override
public void run() {
callHandlerAdded0(newCtx);
}
});
}
/**
* Called once a {@link Throwable} hit the end of the {@link ChannelPipeline} without been handled by the user
* in {@link ChannelHandler#exceptionCaught(ChannelHandlerContext, Throwable)}.
*/
protected void onUnhandledInboundException(Throwable cause) {
try {
logger.warn(
"An exceptionCaught() event was fired, and it reached at the tail of the pipeline. " +
"It usually means the last handler in the pipeline did not handle the exception.",
cause);
} finally {
ReferenceCountUtil.release(cause);
}
}
/**
* Called once the {@link ChannelInboundHandler#channelActive(ChannelHandlerContext)}event hit
* the end of the {@link ChannelPipeline}.
*/
protected void onUnhandledInboundChannelActive() {
}
/**
* Called once the {@link ChannelInboundHandler#channelInactive(ChannelHandlerContext)} event hit
* the end of the {@link ChannelPipeline}.
*/
protected void onUnhandledInboundChannelInactive() {
}
/**
* Called once a message hit the end of the {@link ChannelPipeline} without been handled by the user
* in {@link ChannelInboundHandler#channelRead(ChannelHandlerContext, Object)}. This method is responsible
* to call {@link ReferenceCountUtil#release(Object)} on the given msg at some point.
*/
protected void onUnhandledInboundMessage(Object msg) {
try {
logger.debug(
"Discarded inbound message {} that reached at the tail of the pipeline. " +
"Please check your pipeline configuration.", msg);
} finally {
ReferenceCountUtil.release(msg);
}
}
/**
* Called once a message hit the end of the {@link ChannelPipeline} without been handled by the user
* in {@link ChannelInboundHandler#channelRead(ChannelHandlerContext, Object)}. This method is responsible
* to call {@link ReferenceCountUtil#release(Object)} on the given msg at some point.
*/
protected void onUnhandledInboundMessage(ChannelHandlerContext ctx, Object msg) {
onUnhandledInboundMessage(msg);
if (logger.isDebugEnabled()) {
logger.debug("Discarded message pipeline : {}. Channel : {}.",
ctx.pipeline().names(), ctx.channel());
}
}
/**
* Called once the {@link ChannelInboundHandler#channelReadComplete(ChannelHandlerContext)} event hit
* the end of the {@link ChannelPipeline}.
*/
protected void onUnhandledInboundChannelReadComplete() {
}
/**
* Called once an user event hit the end of the {@link ChannelPipeline} without been handled by the user
* in {@link ChannelInboundHandler#userEventTriggered(ChannelHandlerContext, Object)}. This method is responsible
* to call {@link ReferenceCountUtil#release(Object)} on the given event at some point.
*/
protected void onUnhandledInboundUserEventTriggered(Object evt) {
// This may not be a configuration error and so don't log anything.
// The event may be superfluous for the current pipeline configuration.
ReferenceCountUtil.release(evt);
}
/**
* Called once the {@link ChannelInboundHandler#channelWritabilityChanged(ChannelHandlerContext)} event hit
* the end of the {@link ChannelPipeline}.
*/
protected void onUnhandledChannelWritabilityChanged() {
}
@UnstableApi
protected void incrementPendingOutboundBytes(long size) {
ChannelOutboundBuffer buffer = channel.unsafe().outboundBuffer();
if (buffer != null) {
buffer.incrementPendingOutboundBytes(size);
}
}
@UnstableApi
protected void decrementPendingOutboundBytes(long size) {
ChannelOutboundBuffer buffer = channel.unsafe().outboundBuffer();
if (buffer != null) {
buffer.decrementPendingOutboundBytes(size);
}
}
// A special catch-all handler that handles both bytes and messages.
final class TailContext extends AbstractChannelHandlerContext implements ChannelInboundHandler {
TailContext(DefaultChannelPipeline pipeline) {
super(pipeline, null, TAIL_NAME, TailContext.class);
setAddComplete();
}
@Override
public ChannelHandler handler() {
return this;
}
@Override
public void channelRegistered(ChannelHandlerContext ctx) { }
@Override
public void channelUnregistered(ChannelHandlerContext ctx) { }
@Override
public void channelActive(ChannelHandlerContext ctx) {
onUnhandledInboundChannelActive();
}
@Override
public void channelInactive(ChannelHandlerContext ctx) {
onUnhandledInboundChannelInactive();
}
@Override
public void channelWritabilityChanged(ChannelHandlerContext ctx) {
onUnhandledChannelWritabilityChanged();
}
@Override
public void handlerAdded(ChannelHandlerContext ctx) { }
@Override
public void handlerRemoved(ChannelHandlerContext ctx) { }
@Override
public void userEventTriggered(ChannelHandlerContext ctx, Object evt) {
onUnhandledInboundUserEventTriggered(evt);
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
onUnhandledInboundException(cause);
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) {
onUnhandledInboundMessage(ctx, msg);
}
@Override
public void channelReadComplete(ChannelHandlerContext ctx) {
onUnhandledInboundChannelReadComplete();
}
}
final class HeadContext extends AbstractChannelHandlerContext
implements ChannelOutboundHandler, ChannelInboundHandler {
private final Unsafe unsafe;
HeadContext(DefaultChannelPipeline pipeline) {
super(pipeline, null, HEAD_NAME, HeadContext.class);
unsafe = pipeline.channel().unsafe();
setAddComplete();
}
@Override
public ChannelHandler handler() {
return this;
}
@Override
public void handlerAdded(ChannelHandlerContext ctx) {
// NOOP
}
@Override
public void handlerRemoved(ChannelHandlerContext ctx) {
// NOOP
}
@Override
public void bind(
ChannelHandlerContext ctx, SocketAddress localAddress, ChannelPromise promise) {
unsafe.bind(localAddress, promise);
}
@Override
public void connect(
ChannelHandlerContext ctx,
SocketAddress remoteAddress, SocketAddress localAddress,
ChannelPromise promise) {
unsafe.connect(remoteAddress, localAddress, promise);
}
@Override
public void disconnect(ChannelHandlerContext ctx, ChannelPromise promise) {
unsafe.disconnect(promise);
}
@Override
public void close(ChannelHandlerContext ctx, ChannelPromise promise) {
unsafe.close(promise);
}
@Override
public void deregister(ChannelHandlerContext ctx, ChannelPromise promise) {
unsafe.deregister(promise);
}
@Override
public void read(ChannelHandlerContext ctx) {
unsafe.beginRead();
}
@Override
public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) {
unsafe.write(msg, promise);
}
@Override
public void flush(ChannelHandlerContext ctx) {
unsafe.flush();
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
ctx.fireExceptionCaught(cause);
}
@Override
public void channelRegistered(ChannelHandlerContext ctx) {
invokeHandlerAddedIfNeeded();
ctx.fireChannelRegistered();
}
@Override
public void channelUnregistered(ChannelHandlerContext ctx) {
ctx.fireChannelUnregistered();
// Remove all handlers sequentially if channel is closed and unregistered.
if (!channel.isOpen()) {
destroy();
}
}
@Override
public void channelActive(ChannelHandlerContext ctx) {
ctx.fireChannelActive();
readIfIsAutoRead();
}
@Override
public void channelInactive(ChannelHandlerContext ctx) {
ctx.fireChannelInactive();
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) {
ctx.fireChannelRead(msg);
}
@Override
public void channelReadComplete(ChannelHandlerContext ctx) {
ctx.fireChannelReadComplete();
readIfIsAutoRead();
}
private void readIfIsAutoRead() {
if (channel.config().isAutoRead()) {
channel.read();
}
}
@Override
public void userEventTriggered(ChannelHandlerContext ctx, Object evt) {
ctx.fireUserEventTriggered(evt);
}
@Override
public void channelWritabilityChanged(ChannelHandlerContext ctx) {
ctx.fireChannelWritabilityChanged();
}
}
private abstract static class PendingHandlerCallback implements Runnable {
final AbstractChannelHandlerContext ctx;
PendingHandlerCallback next;
PendingHandlerCallback(AbstractChannelHandlerContext ctx) {
this.ctx = ctx;
}
abstract void execute();
}
private final class PendingHandlerAddedTask extends PendingHandlerCallback {
PendingHandlerAddedTask(AbstractChannelHandlerContext ctx) {
super(ctx);
}
@Override
public void run() {
callHandlerAdded0(ctx);
}
@Override
void execute() {
EventExecutor executor = ctx.executor();
if (executor.inEventLoop()) {
callHandlerAdded0(ctx);
} else {
try {
executor.execute(this);
} catch (RejectedExecutionException e) {
if (logger.isWarnEnabled()) {
logger.warn(
"Can't invoke handlerAdded() as the EventExecutor {} rejected it, removing handler {}.",
executor, ctx.name(), e);
}
atomicRemoveFromHandlerList(ctx);
ctx.setRemoved();
}
}
}
}
private final class PendingHandlerRemovedTask extends PendingHandlerCallback {
PendingHandlerRemovedTask(AbstractChannelHandlerContext ctx) {
super(ctx);
}
@Override
public void run() {
callHandlerRemoved0(ctx);
}
@Override
void execute() {
EventExecutor executor = ctx.executor();
if (executor.inEventLoop()) {
callHandlerRemoved0(ctx);
} else {
try {
executor.execute(this);
} catch (RejectedExecutionException e) {
if (logger.isWarnEnabled()) {
logger.warn(
"Can't invoke handlerRemoved() as the EventExecutor {} rejected it," +
" removing handler {}.", executor, ctx.name(), e);
}
// remove0(...) was call before so just call AbstractChannelHandlerContext.setRemoved().
ctx.setRemoved();
}
}
}
}
}
