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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including
all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and
Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
* 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:
*
* http://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.concurrent.EventExecutor;
import io.netty.util.concurrent.EventExecutorGroup;
import io.netty.util.internal.OneTimeTask;
import io.netty.util.internal.PlatformDependent;
import io.netty.util.internal.StringUtil;
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.HashMap;
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.ExecutionException;
import java.util.concurrent.Future;
/**
* The default {@link ChannelPipeline} implementation. It is usually created
* by a {@link Channel} implementation when the {@link Channel} is created.
*/
final class DefaultChannelPipeline implements ChannelPipeline {
static final InternalLogger logger = InternalLoggerFactory.getInstance(DefaultChannelPipeline.class);
@SuppressWarnings("unchecked")
private static final WeakHashMap, String>[] nameCaches =
new WeakHashMap[Runtime.getRuntime().availableProcessors()];
static {
for (int i = 0; i < nameCaches.length; i ++) {
nameCaches[i] = new WeakHashMap, String>();
}
}
final AbstractChannel channel;
final AbstractChannelHandlerContext head;
final AbstractChannelHandlerContext tail;
private final Map name2ctx =
new HashMap(4);
final Map childExecutors =
new IdentityHashMap();
public DefaultChannelPipeline(AbstractChannel channel) {
if (channel == null) {
throw new NullPointerException("channel");
}
this.channel = channel;
tail = new TailContext(this);
head = new HeadContext(this);
head.next = tail;
tail.prev = head;
}
@Override
public Channel channel() {
return channel;
}
@Override
public ChannelPipeline addFirst(String name, ChannelHandler handler) {
return addFirst(null, name, handler);
}
@Override
public ChannelPipeline addFirst(EventExecutorGroup group, final String name, ChannelHandler handler) {
synchronized (this) {
checkDuplicateName(name);
AbstractChannelHandlerContext newCtx = new DefaultChannelHandlerContext(this, group, name, handler);
addFirst0(name, newCtx);
}
return this;
}
private void addFirst0(String name, AbstractChannelHandlerContext newCtx) {
checkMultiplicity(newCtx);
AbstractChannelHandlerContext nextCtx = head.next;
newCtx.prev = head;
newCtx.next = nextCtx;
head.next = newCtx;
nextCtx.prev = newCtx;
name2ctx.put(name, newCtx);
callHandlerAdded(newCtx);
}
@Override
public ChannelPipeline addLast(String name, ChannelHandler handler) {
return addLast(null, name, handler);
}
@Override
public ChannelPipeline addLast(EventExecutorGroup group, final String name, ChannelHandler handler) {
synchronized (this) {
checkDuplicateName(name);
AbstractChannelHandlerContext newCtx = new DefaultChannelHandlerContext(this, group, name, handler);
addLast0(name, newCtx);
}
return this;
}
private void addLast0(final String name, AbstractChannelHandlerContext newCtx) {
checkMultiplicity(newCtx);
AbstractChannelHandlerContext prev = tail.prev;
newCtx.prev = prev;
newCtx.next = tail;
prev.next = newCtx;
tail.prev = newCtx;
name2ctx.put(name, newCtx);
callHandlerAdded(newCtx);
}
@Override
public ChannelPipeline addBefore(String baseName, String name, ChannelHandler handler) {
return addBefore(null, baseName, name, handler);
}
@Override
public ChannelPipeline addBefore(
EventExecutorGroup group, String baseName, final String name, ChannelHandler handler) {
synchronized (this) {
AbstractChannelHandlerContext ctx = getContextOrDie(baseName);
checkDuplicateName(name);
AbstractChannelHandlerContext newCtx = new DefaultChannelHandlerContext(this, group, name, handler);
addBefore0(name, ctx, newCtx);
}
return this;
}
private void addBefore0(
final String name, AbstractChannelHandlerContext ctx, AbstractChannelHandlerContext newCtx) {
checkMultiplicity(newCtx);
newCtx.prev = ctx.prev;
newCtx.next = ctx;
ctx.prev.next = newCtx;
ctx.prev = newCtx;
name2ctx.put(name, newCtx);
callHandlerAdded(newCtx);
}
@Override
public ChannelPipeline addAfter(String baseName, String name, ChannelHandler handler) {
return addAfter(null, baseName, name, handler);
}
@Override
public ChannelPipeline addAfter(
EventExecutorGroup group, String baseName, final String name, ChannelHandler handler) {
synchronized (this) {
AbstractChannelHandlerContext ctx = getContextOrDie(baseName);
checkDuplicateName(name);
AbstractChannelHandlerContext newCtx = new DefaultChannelHandlerContext(this, group, name, handler);
addAfter0(name, ctx, newCtx);
}
return this;
}
private void addAfter0(final String name, AbstractChannelHandlerContext ctx, AbstractChannelHandlerContext newCtx) {
checkDuplicateName(name);
checkMultiplicity(newCtx);
newCtx.prev = ctx;
newCtx.next = ctx.next;
ctx.next.prev = newCtx;
ctx.next = newCtx;
name2ctx.put(name, newCtx);
callHandlerAdded(newCtx);
}
@Override
public ChannelPipeline addFirst(ChannelHandler... handlers) {
return addFirst(null, handlers);
}
@Override
public ChannelPipeline addFirst(EventExecutorGroup executor, ChannelHandler... handlers) {
if (handlers == null) {
throw new NullPointerException("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, generateName(h), h);
}
return this;
}
@Override
public ChannelPipeline addLast(ChannelHandler... handlers) {
return addLast(null, handlers);
}
@Override
public ChannelPipeline addLast(EventExecutorGroup executor, ChannelHandler... handlers) {
if (handlers == null) {
throw new NullPointerException("handlers");
}
for (ChannelHandler h: handlers) {
if (h == null) {
break;
}
addLast(executor, generateName(h), h);
}
return this;
}
private String generateName(ChannelHandler handler) {
WeakHashMap, String> cache = nameCaches[(int) (Thread.currentThread().getId() % nameCaches.length)];
Class handlerType = handler.getClass();
String name;
synchronized (cache) {
name = cache.get(handlerType);
if (name == null) {
name = generateName0(handlerType);
cache.put(handlerType, name);
}
}
synchronized (this) {
// 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 (name2ctx.containsKey(name)) {
String baseName = name.substring(0, name.length() - 1); // Strip the trailing '0'.
for (int i = 1;; i ++) {
String newName = baseName + i;
if (!name2ctx.containsKey(newName)) {
name = newName;
break;
}
}
}
}
return name;
}
private static String generateName0(Class handlerType) {
return StringUtil.simpleClassName(handlerType) + "#0";
}
@Override
public ChannelPipeline remove(ChannelHandler handler) {
remove(getContextOrDie(handler));
return this;
}
@Override
public ChannelHandler remove(String name) {
return remove(getContextOrDie(name)).handler();
}
@SuppressWarnings("unchecked")
@Override
public T remove(Class handlerType) {
return (T) remove(getContextOrDie(handlerType)).handler();
}
private AbstractChannelHandlerContext remove(final AbstractChannelHandlerContext ctx) {
assert ctx != head && ctx != tail;
AbstractChannelHandlerContext context;
Future future;
synchronized (this) {
if (!ctx.channel().isRegistered() || ctx.executor().inEventLoop()) {
remove0(ctx);
return ctx;
} else {
future = ctx.executor().submit(new Runnable() {
@Override
public void run() {
synchronized (DefaultChannelPipeline.this) {
remove0(ctx);
}
}
});
context = ctx;
}
}
// Run the following 'waiting' code outside of the above synchronized block
// in order to avoid deadlock
waitForFuture(future);
return context;
}
void remove0(AbstractChannelHandlerContext ctx) {
AbstractChannelHandlerContext prev = ctx.prev;
AbstractChannelHandlerContext next = ctx.next;
prev.next = next;
next.prev = prev;
name2ctx.remove(ctx.name());
callHandlerRemoved(ctx);
}
@Override
public ChannelHandler removeFirst() {
if (head.next == tail) {
throw new NoSuchElementException();
}
return remove(head.next).handler();
}
@Override
public ChannelHandler removeLast() {
if (head.next == tail) {
throw new NoSuchElementException();
}
return remove(tail.prev).handler();
}
@Override
public ChannelPipeline replace(ChannelHandler oldHandler, String newName, ChannelHandler newHandler) {
replace(getContextOrDie(oldHandler), newName, newHandler);
return this;
}
@Override
public ChannelHandler replace(String oldName, String newName, ChannelHandler newHandler) {
return replace(getContextOrDie(oldName), newName, newHandler);
}
@Override
@SuppressWarnings("unchecked")
public T replace(
Class oldHandlerType, String newName, ChannelHandler newHandler) {
return (T) replace(getContextOrDie(oldHandlerType), newName, newHandler);
}
private ChannelHandler replace(
final AbstractChannelHandlerContext ctx, final String newName,
ChannelHandler newHandler) {
assert ctx != head && ctx != tail;
Future future;
synchronized (this) {
boolean sameName = ctx.name().equals(newName);
if (!sameName) {
checkDuplicateName(newName);
}
final AbstractChannelHandlerContext newCtx =
new DefaultChannelHandlerContext(this, ctx.executor, newName, newHandler);
if (!newCtx.channel().isRegistered() || newCtx.executor().inEventLoop()) {
replace0(ctx, newName, newCtx);
return ctx.handler();
} else {
future = newCtx.executor().submit(new Runnable() {
@Override
public void run() {
synchronized (DefaultChannelPipeline.this) {
replace0(ctx, newName, newCtx);
}
}
});
}
}
// Run the following 'waiting' code outside of the above synchronized block
// in order to avoid deadlock
waitForFuture(future);
return ctx.handler();
}
private void replace0(AbstractChannelHandlerContext oldCtx, String newName,
AbstractChannelHandlerContext newCtx) {
checkMultiplicity(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;
if (!oldCtx.name().equals(newName)) {
name2ctx.remove(oldCtx.name());
}
name2ctx.put(newName, newCtx);
// update the reference to the replacement so forward of buffered content will work correctly
oldCtx.prev = newCtx;
oldCtx.next = newCtx;
// Invoke newHandler.handlerAdded() first (i.e. before oldHandler.handlerRemoved() is invoked)
// because callHandlerRemoved() will trigger inboundBufferUpdated() or flush() on newHandler and those
// event handlers must be called after handlerAdded().
callHandlerAdded(newCtx);
callHandlerRemoved(oldCtx);
}
private static void checkMultiplicity(ChannelHandlerContext ctx) {
ChannelHandler handler = ctx.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 callHandlerAdded(final ChannelHandlerContext ctx) {
if (ctx.channel().isRegistered() && !ctx.executor().inEventLoop()) {
ctx.executor().execute(new Runnable() {
@Override
public void run() {
callHandlerAdded0(ctx);
}
});
return;
}
callHandlerAdded0(ctx);
}
private void callHandlerAdded0(final ChannelHandlerContext ctx) {
try {
ctx.handler().handlerAdded(ctx);
} catch (Throwable t) {
boolean removed = false;
try {
remove((AbstractChannelHandlerContext) ctx);
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 callHandlerRemoved(final AbstractChannelHandlerContext ctx) {
if (ctx.channel().isRegistered() && !ctx.executor().inEventLoop()) {
ctx.executor().execute(new Runnable() {
@Override
public void run() {
callHandlerRemoved0(ctx);
}
});
return;
}
callHandlerRemoved0(ctx);
}
private void callHandlerRemoved0(final AbstractChannelHandlerContext ctx) {
// Notify the complete removal.
try {
ctx.handler().handlerRemoved(ctx);
ctx.setRemoved();
} catch (Throwable t) {
fireExceptionCaught(new ChannelPipelineException(
ctx.handler().getClass().getName() + ".handlerRemoved() has thrown an exception.", t));
}
}
/**
* Waits for a future to finish. If the task is interrupted, then the current thread will be interrupted.
* It is expected that the task performs any appropriate locking.
*
* If the internal call throws a {@link Throwable}, but it is not an instance of {@link Error} or
* {@link RuntimeException}, then it is wrapped inside a {@link ChannelPipelineException} and that is
* thrown instead.
*
* @param future wait for this future
* @see Future#get()
* @throws Error if the task threw this.
* @throws RuntimeException if the task threw this.
* @throws ChannelPipelineException with a {@link Throwable} as a cause, if the task threw another type of
* {@link Throwable}.
*/
private static void waitForFuture(Future future) {
try {
future.get();
} catch (ExecutionException ex) {
// In the arbitrary case, we can throw Error, RuntimeException, and Exception
PlatformDependent.throwException(ex.getCause());
} catch (InterruptedException ex) {
// Interrupt the calling thread (note that this method is not called from the event loop)
Thread.currentThread().interrupt();
}
}
@Override
public ChannelHandler first() {
ChannelHandlerContext first = firstContext();
if (first == null) {
return null;
}
return first.handler();
}
@Override
public ChannelHandlerContext firstContext() {
AbstractChannelHandlerContext first = head.next;
if (first == tail) {
return null;
}
return head.next;
}
@Override
public ChannelHandler last() {
AbstractChannelHandlerContext last = tail.prev;
if (last == head) {
return null;
}
return last.handler();
}
@Override
public ChannelHandlerContext lastContext() {
AbstractChannelHandlerContext last = tail.prev;
if (last == head) {
return null;
}
return last;
}
@Override
public ChannelHandler get(String name) {
ChannelHandlerContext ctx = context(name);
if (ctx == null) {
return null;
} else {
return ctx.handler();
}
}
@SuppressWarnings("unchecked")
@Override
public T get(Class handlerType) {
ChannelHandlerContext ctx = context(handlerType);
if (ctx == null) {
return null;
} else {
return (T) ctx.handler();
}
}
@Override
public ChannelHandlerContext context(String name) {
if (name == null) {
throw new NullPointerException("name");
}
synchronized (this) {
return name2ctx.get(name);
}
}
@Override
public ChannelHandlerContext context(ChannelHandler handler) {
if (handler == null) {
throw new NullPointerException("handler");
}
AbstractChannelHandlerContext ctx = head.next;
for (;;) {
if (ctx == null) {
return null;
}
if (ctx.handler() == handler) {
return ctx;
}
ctx = ctx.next;
}
}
@Override
public ChannelHandlerContext context(Class handlerType) {
if (handlerType == null) {
throw new NullPointerException("handlerType");
}
AbstractChannelHandlerContext ctx = head.next;
for (;;) {
if (ctx == null) {
return null;
}
if (handlerType.isAssignableFrom(ctx.handler().getClass())) {
return ctx;
}
ctx = ctx.next;
}
}
@Override
public 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 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 Iterator> iterator() {
return toMap().entrySet().iterator();
}
/**
* Returns the {@link String} representation of this pipeline.
*/
@Override
public 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 ChannelPipeline fireChannelRegistered() {
head.fireChannelRegistered();
return this;
}
@Override
public ChannelPipeline fireChannelUnregistered() {
head.fireChannelUnregistered();
// Remove all handlers sequentially if channel is closed and unregistered.
if (!channel.isOpen()) {
destroy();
}
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)})
* before traversing down ({@link #destroyDown(Thread, AbstractChannelHandlerContext)}) so that
* the handlers are removed after all events are handled.
*
* See: https://github.com/netty/netty/issues/3156
*/
private void destroy() {
destroyUp(head.next);
}
private void destroyUp(AbstractChannelHandlerContext ctx) {
final Thread currentThread = Thread.currentThread();
final AbstractChannelHandlerContext tail = this.tail;
for (;;) {
if (ctx == tail) {
destroyDown(currentThread, tail.prev);
break;
}
final EventExecutor executor = ctx.executor();
if (!executor.inEventLoop(currentThread)) {
final AbstractChannelHandlerContext finalCtx = ctx;
executor.execute(new OneTimeTask() {
@Override
public void run() {
destroyUp(finalCtx);
}
});
break;
}
ctx = ctx.next;
}
}
private void destroyDown(Thread currentThread, AbstractChannelHandlerContext ctx) {
// We have reached at tail; now traverse backwards.
final AbstractChannelHandlerContext head = this.head;
for (;;) {
if (ctx == head) {
break;
}
final EventExecutor executor = ctx.executor();
if (executor.inEventLoop(currentThread)) {
synchronized (this) {
remove0(ctx);
}
} else {
final AbstractChannelHandlerContext finalCtx = ctx;
executor.execute(new OneTimeTask() {
@Override
public void run() {
destroyDown(Thread.currentThread(), finalCtx);
}
});
break;
}
ctx = ctx.prev;
}
}
@Override
public ChannelPipeline fireChannelActive() {
head.fireChannelActive();
if (channel.config().isAutoRead()) {
channel.read();
}
return this;
}
@Override
public ChannelPipeline fireChannelInactive() {
head.fireChannelInactive();
return this;
}
@Override
public ChannelPipeline fireExceptionCaught(Throwable cause) {
head.fireExceptionCaught(cause);
return this;
}
@Override
public ChannelPipeline fireUserEventTriggered(Object event) {
head.fireUserEventTriggered(event);
return this;
}
@Override
public ChannelPipeline fireChannelRead(Object msg) {
head.fireChannelRead(msg);
return this;
}
@Override
public ChannelPipeline fireChannelReadComplete() {
head.fireChannelReadComplete();
if (channel.config().isAutoRead()) {
read();
}
return this;
}
@Override
public ChannelPipeline fireChannelWritabilityChanged() {
head.fireChannelWritabilityChanged();
return this;
}
@Override
public ChannelFuture bind(SocketAddress localAddress) {
return tail.bind(localAddress);
}
@Override
public ChannelFuture connect(SocketAddress remoteAddress) {
return tail.connect(remoteAddress);
}
@Override
public ChannelFuture connect(SocketAddress remoteAddress, SocketAddress localAddress) {
return tail.connect(remoteAddress, localAddress);
}
@Override
public ChannelFuture disconnect() {
return tail.disconnect();
}
@Override
public ChannelFuture close() {
return tail.close();
}
@Override
public ChannelFuture deregister() {
return tail.deregister();
}
@Override
public ChannelPipeline flush() {
tail.flush();
return this;
}
@Override
public ChannelFuture bind(SocketAddress localAddress, ChannelPromise promise) {
return tail.bind(localAddress, promise);
}
@Override
public ChannelFuture connect(SocketAddress remoteAddress, ChannelPromise promise) {
return tail.connect(remoteAddress, promise);
}
@Override
public ChannelFuture connect(SocketAddress remoteAddress, SocketAddress localAddress, ChannelPromise promise) {
return tail.connect(remoteAddress, localAddress, promise);
}
@Override
public ChannelFuture disconnect(ChannelPromise promise) {
return tail.disconnect(promise);
}
@Override
public ChannelFuture close(ChannelPromise promise) {
return tail.close(promise);
}
@Override
public ChannelFuture deregister(final ChannelPromise promise) {
return tail.deregister(promise);
}
@Override
public ChannelPipeline read() {
tail.read();
return this;
}
@Override
public ChannelFuture write(Object msg) {
return tail.write(msg);
}
@Override
public ChannelFuture write(Object msg, ChannelPromise promise) {
return tail.write(msg, promise);
}
@Override
public ChannelFuture writeAndFlush(Object msg, ChannelPromise promise) {
return tail.writeAndFlush(msg, promise);
}
@Override
public ChannelFuture writeAndFlush(Object msg) {
return tail.writeAndFlush(msg);
}
private void checkDuplicateName(String name) {
if (name2ctx.containsKey(name)) {
throw new IllegalArgumentException("Duplicate handler name: " + name);
}
}
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;
}
}
// A special catch-all handler that handles both bytes and messages.
static final class TailContext extends AbstractChannelHandlerContext implements ChannelInboundHandler {
private static final String TAIL_NAME = generateName0(TailContext.class);
TailContext(DefaultChannelPipeline pipeline) {
super(pipeline, null, TAIL_NAME, true, false);
}
@Override
public ChannelHandler handler() {
return this;
}
@Override
public void channelRegistered(ChannelHandlerContext ctx) throws Exception { }
@Override
public void channelUnregistered(ChannelHandlerContext ctx) throws Exception { }
@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception { }
@Override
public void channelInactive(ChannelHandlerContext ctx) throws Exception { }
@Override
public void channelWritabilityChanged(ChannelHandlerContext ctx) throws Exception { }
@Override
public void handlerAdded(ChannelHandlerContext ctx) throws Exception { }
@Override
public void handlerRemoved(ChannelHandlerContext ctx) throws Exception { }
@Override
public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
// 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);
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
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);
}
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
try {
logger.debug(
"Discarded inbound message {} that reached at the tail of the pipeline. " +
"Please check your pipeline configuration.", msg);
} finally {
ReferenceCountUtil.release(msg);
}
}
@Override
public void channelReadComplete(ChannelHandlerContext ctx) throws Exception { }
}
static final class HeadContext extends AbstractChannelHandlerContext implements ChannelOutboundHandler {
private static final String HEAD_NAME = generateName0(HeadContext.class);
protected final Unsafe unsafe;
HeadContext(DefaultChannelPipeline pipeline) {
super(pipeline, null, HEAD_NAME, false, true);
unsafe = pipeline.channel().unsafe();
}
@Override
public ChannelHandler handler() {
return this;
}
@Override
public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
// NOOP
}
@Override
public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
// NOOP
}
@Override
public void bind(
ChannelHandlerContext ctx, SocketAddress localAddress, ChannelPromise promise)
throws Exception {
unsafe.bind(localAddress, promise);
}
@Override
public void connect(
ChannelHandlerContext ctx,
SocketAddress remoteAddress, SocketAddress localAddress,
ChannelPromise promise) throws Exception {
unsafe.connect(remoteAddress, localAddress, promise);
}
@Override
public void disconnect(ChannelHandlerContext ctx, ChannelPromise promise) throws Exception {
unsafe.disconnect(promise);
}
@Override
public void close(ChannelHandlerContext ctx, ChannelPromise promise) throws Exception {
unsafe.close(promise);
}
@Override
public void deregister(ChannelHandlerContext ctx, ChannelPromise promise) throws Exception {
unsafe.deregister(promise);
}
@Override
public void read(ChannelHandlerContext ctx) {
unsafe.beginRead();
}
@Override
public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
unsafe.write(msg, promise);
}
@Override
public void flush(ChannelHandlerContext ctx) throws Exception {
unsafe.flush();
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
ctx.fireExceptionCaught(cause);
}
}
}
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