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io.netty.channel.CombinedChannelDuplexHandler Maven / Gradle / Ivy
/*
* 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.buffer.ByteBufAllocator;
import io.netty.util.Attribute;
import io.netty.util.AttributeKey;
import io.netty.util.concurrent.EventExecutor;
import io.netty.util.internal.ObjectUtil;
import io.netty.util.internal.ThrowableUtil;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;
import java.net.SocketAddress;
/**
* Combines a {@link ChannelInboundHandler} and a {@link ChannelOutboundHandler} into one {@link ChannelHandler}.
*/
public class CombinedChannelDuplexHandler
extends ChannelDuplexHandler {
private static final InternalLogger logger = InternalLoggerFactory.getInstance(CombinedChannelDuplexHandler.class);
private DelegatingChannelHandlerContext inboundCtx;
private DelegatingChannelHandlerContext outboundCtx;
private volatile boolean handlerAdded;
private I inboundHandler;
private O outboundHandler;
/**
* Creates a new uninitialized instance. A class that extends this handler must invoke
* {@link #init(ChannelInboundHandler, ChannelOutboundHandler)} before adding this handler into a
* {@link ChannelPipeline}.
*/
protected CombinedChannelDuplexHandler() {
ensureNotSharable();
}
/**
* Creates a new instance that combines the specified two handlers into one.
*/
public CombinedChannelDuplexHandler(I inboundHandler, O outboundHandler) {
ensureNotSharable();
init(inboundHandler, outboundHandler);
}
/**
* Initialized this handler with the specified handlers.
*
* @throws IllegalStateException if this handler was not constructed via the default constructor or
* if this handler does not implement all required handler interfaces
* @throws IllegalArgumentException if the specified handlers cannot be combined into one due to a conflict
* in the type hierarchy
*/
protected final void init(I inboundHandler, O outboundHandler) {
validate(inboundHandler, outboundHandler);
this.inboundHandler = inboundHandler;
this.outboundHandler = outboundHandler;
}
private void validate(I inboundHandler, O outboundHandler) {
if (this.inboundHandler != null) {
throw new IllegalStateException(
"init() can not be invoked if " + CombinedChannelDuplexHandler.class.getSimpleName() +
" was constructed with non-default constructor.");
}
ObjectUtil.checkNotNull(inboundHandler, "inboundHandler");
ObjectUtil.checkNotNull(outboundHandler, "outboundHandler");
if (inboundHandler instanceof ChannelOutboundHandler) {
throw new IllegalArgumentException(
"inboundHandler must not implement " +
ChannelOutboundHandler.class.getSimpleName() + " to get combined.");
}
if (outboundHandler instanceof ChannelInboundHandler) {
throw new IllegalArgumentException(
"outboundHandler must not implement " +
ChannelInboundHandler.class.getSimpleName() + " to get combined.");
}
}
protected final I inboundHandler() {
return inboundHandler;
}
protected final O outboundHandler() {
return outboundHandler;
}
private void checkAdded() {
if (!handlerAdded) {
throw new IllegalStateException("handler not added to pipeline yet");
}
}
/**
* Removes the {@link ChannelInboundHandler} that was combined in this {@link CombinedChannelDuplexHandler}.
*/
public final void removeInboundHandler() {
checkAdded();
inboundCtx.remove();
}
/**
* Removes the {@link ChannelOutboundHandler} that was combined in this {@link CombinedChannelDuplexHandler}.
*/
public final void removeOutboundHandler() {
checkAdded();
outboundCtx.remove();
}
@Override
public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
if (inboundHandler == null) {
throw new IllegalStateException(
"init() must be invoked before being added to a " + ChannelPipeline.class.getSimpleName() +
" if " + CombinedChannelDuplexHandler.class.getSimpleName() +
" was constructed with the default constructor.");
}
outboundCtx = new DelegatingChannelHandlerContext(ctx, outboundHandler);
inboundCtx = new DelegatingChannelHandlerContext(ctx, inboundHandler) {
@SuppressWarnings("deprecation")
@Override
public ChannelHandlerContext fireExceptionCaught(Throwable cause) {
if (!outboundCtx.removed) {
try {
// We directly delegate to the ChannelOutboundHandler as this may override exceptionCaught(...)
// as well
outboundHandler.exceptionCaught(outboundCtx, cause);
} catch (Throwable error) {
if (logger.isDebugEnabled()) {
logger.debug(
"An exception {}" +
"was thrown by a user handler's exceptionCaught() " +
"method while handling the following exception:",
ThrowableUtil.stackTraceToString(error), cause);
} else if (logger.isWarnEnabled()) {
logger.warn(
"An exception '{}' [enable DEBUG level for full stacktrace] " +
"was thrown by a user handler's exceptionCaught() " +
"method while handling the following exception:", error, cause);
}
}
} else {
super.fireExceptionCaught(cause);
}
return this;
}
};
// The inboundCtx and outboundCtx were created and set now it's safe to call removeInboundHandler() and
// removeOutboundHandler().
handlerAdded = true;
try {
inboundHandler.handlerAdded(inboundCtx);
} finally {
outboundHandler.handlerAdded(outboundCtx);
}
}
@Override
public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
try {
inboundCtx.remove();
} finally {
outboundCtx.remove();
}
}
@Override
public void channelRegistered(ChannelHandlerContext ctx) throws Exception {
assert ctx == inboundCtx.ctx;
if (!inboundCtx.removed) {
inboundHandler.channelRegistered(inboundCtx);
} else {
inboundCtx.fireChannelRegistered();
}
}
@Override
public void channelUnregistered(ChannelHandlerContext ctx) throws Exception {
assert ctx == inboundCtx.ctx;
if (!inboundCtx.removed) {
inboundHandler.channelUnregistered(inboundCtx);
} else {
inboundCtx.fireChannelUnregistered();
}
}
@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
assert ctx == inboundCtx.ctx;
if (!inboundCtx.removed) {
inboundHandler.channelActive(inboundCtx);
} else {
inboundCtx.fireChannelActive();
}
}
@Override
public void channelInactive(ChannelHandlerContext ctx) throws Exception {
assert ctx == inboundCtx.ctx;
if (!inboundCtx.removed) {
inboundHandler.channelInactive(inboundCtx);
} else {
inboundCtx.fireChannelInactive();
}
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
assert ctx == inboundCtx.ctx;
if (!inboundCtx.removed) {
inboundHandler.exceptionCaught(inboundCtx, cause);
} else {
inboundCtx.fireExceptionCaught(cause);
}
}
@Override
public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
assert ctx == inboundCtx.ctx;
if (!inboundCtx.removed) {
inboundHandler.userEventTriggered(inboundCtx, evt);
} else {
inboundCtx.fireUserEventTriggered(evt);
}
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
assert ctx == inboundCtx.ctx;
if (!inboundCtx.removed) {
inboundHandler.channelRead(inboundCtx, msg);
} else {
inboundCtx.fireChannelRead(msg);
}
}
@Override
public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
assert ctx == inboundCtx.ctx;
if (!inboundCtx.removed) {
inboundHandler.channelReadComplete(inboundCtx);
} else {
inboundCtx.fireChannelReadComplete();
}
}
@Override
public void channelWritabilityChanged(ChannelHandlerContext ctx) throws Exception {
assert ctx == inboundCtx.ctx;
if (!inboundCtx.removed) {
inboundHandler.channelWritabilityChanged(inboundCtx);
} else {
inboundCtx.fireChannelWritabilityChanged();
}
}
@Override
public void bind(
ChannelHandlerContext ctx,
SocketAddress localAddress, ChannelPromise promise) throws Exception {
assert ctx == outboundCtx.ctx;
if (!outboundCtx.removed) {
outboundHandler.bind(outboundCtx, localAddress, promise);
} else {
outboundCtx.bind(localAddress, promise);
}
}
@Override
public void connect(
ChannelHandlerContext ctx,
SocketAddress remoteAddress, SocketAddress localAddress,
ChannelPromise promise) throws Exception {
assert ctx == outboundCtx.ctx;
if (!outboundCtx.removed) {
outboundHandler.connect(outboundCtx, remoteAddress, localAddress, promise);
} else {
outboundCtx.connect(remoteAddress, localAddress, promise);
}
}
@Override
public void disconnect(ChannelHandlerContext ctx, ChannelPromise promise) throws Exception {
assert ctx == outboundCtx.ctx;
if (!outboundCtx.removed) {
outboundHandler.disconnect(outboundCtx, promise);
} else {
outboundCtx.disconnect(promise);
}
}
@Override
public void close(ChannelHandlerContext ctx, ChannelPromise promise) throws Exception {
assert ctx == outboundCtx.ctx;
if (!outboundCtx.removed) {
outboundHandler.close(outboundCtx, promise);
} else {
outboundCtx.close(promise);
}
}
@Override
public void deregister(ChannelHandlerContext ctx, ChannelPromise promise) throws Exception {
assert ctx == outboundCtx.ctx;
if (!outboundCtx.removed) {
outboundHandler.deregister(outboundCtx, promise);
} else {
outboundCtx.deregister(promise);
}
}
@Override
public void read(ChannelHandlerContext ctx) throws Exception {
assert ctx == outboundCtx.ctx;
if (!outboundCtx.removed) {
outboundHandler.read(outboundCtx);
} else {
outboundCtx.read();
}
}
@Override
public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
assert ctx == outboundCtx.ctx;
if (!outboundCtx.removed) {
outboundHandler.write(outboundCtx, msg, promise);
} else {
outboundCtx.write(msg, promise);
}
}
@Override
public void flush(ChannelHandlerContext ctx) throws Exception {
assert ctx == outboundCtx.ctx;
if (!outboundCtx.removed) {
outboundHandler.flush(outboundCtx);
} else {
outboundCtx.flush();
}
}
private static class DelegatingChannelHandlerContext implements ChannelHandlerContext {
private final ChannelHandlerContext ctx;
private final ChannelHandler handler;
boolean removed;
DelegatingChannelHandlerContext(ChannelHandlerContext ctx, ChannelHandler handler) {
this.ctx = ctx;
this.handler = handler;
}
@Override
public Channel channel() {
return ctx.channel();
}
@Override
public EventExecutor executor() {
return ctx.executor();
}
@Override
public String name() {
return ctx.name();
}
@Override
public ChannelHandler handler() {
return ctx.handler();
}
@Override
public boolean isRemoved() {
return removed || ctx.isRemoved();
}
@Override
public ChannelHandlerContext fireChannelRegistered() {
ctx.fireChannelRegistered();
return this;
}
@Override
public ChannelHandlerContext fireChannelUnregistered() {
ctx.fireChannelUnregistered();
return this;
}
@Override
public ChannelHandlerContext fireChannelActive() {
ctx.fireChannelActive();
return this;
}
@Override
public ChannelHandlerContext fireChannelInactive() {
ctx.fireChannelInactive();
return this;
}
@Override
public ChannelHandlerContext fireExceptionCaught(Throwable cause) {
ctx.fireExceptionCaught(cause);
return this;
}
@Override
public ChannelHandlerContext fireUserEventTriggered(Object event) {
ctx.fireUserEventTriggered(event);
return this;
}
@Override
public ChannelHandlerContext fireChannelRead(Object msg) {
ctx.fireChannelRead(msg);
return this;
}
@Override
public ChannelHandlerContext fireChannelReadComplete() {
ctx.fireChannelReadComplete();
return this;
}
@Override
public ChannelHandlerContext fireChannelWritabilityChanged() {
ctx.fireChannelWritabilityChanged();
return this;
}
@Override
public ChannelFuture bind(SocketAddress localAddress) {
return ctx.bind(localAddress);
}
@Override
public ChannelFuture connect(SocketAddress remoteAddress) {
return ctx.connect(remoteAddress);
}
@Override
public ChannelFuture connect(SocketAddress remoteAddress, SocketAddress localAddress) {
return ctx.connect(remoteAddress, localAddress);
}
@Override
public ChannelFuture disconnect() {
return ctx.disconnect();
}
@Override
public ChannelFuture close() {
return ctx.close();
}
@Override
public ChannelFuture deregister() {
return ctx.deregister();
}
@Override
public ChannelFuture bind(SocketAddress localAddress, ChannelPromise promise) {
return ctx.bind(localAddress, promise);
}
@Override
public ChannelFuture connect(SocketAddress remoteAddress, ChannelPromise promise) {
return ctx.connect(remoteAddress, promise);
}
@Override
public ChannelFuture connect(
SocketAddress remoteAddress, SocketAddress localAddress, ChannelPromise promise) {
return ctx.connect(remoteAddress, localAddress, promise);
}
@Override
public ChannelFuture disconnect(ChannelPromise promise) {
return ctx.disconnect(promise);
}
@Override
public ChannelFuture close(ChannelPromise promise) {
return ctx.close(promise);
}
@Override
public ChannelFuture deregister(ChannelPromise promise) {
return ctx.deregister(promise);
}
@Override
public ChannelHandlerContext read() {
ctx.read();
return this;
}
@Override
public ChannelFuture write(Object msg) {
return ctx.write(msg);
}
@Override
public ChannelFuture write(Object msg, ChannelPromise promise) {
return ctx.write(msg, promise);
}
@Override
public ChannelHandlerContext flush() {
ctx.flush();
return this;
}
@Override
public ChannelFuture writeAndFlush(Object msg, ChannelPromise promise) {
return ctx.writeAndFlush(msg, promise);
}
@Override
public ChannelFuture writeAndFlush(Object msg) {
return ctx.writeAndFlush(msg);
}
@Override
public ChannelPipeline pipeline() {
return ctx.pipeline();
}
@Override
public ByteBufAllocator alloc() {
return ctx.alloc();
}
@Override
public ChannelPromise newPromise() {
return ctx.newPromise();
}
@Override
public ChannelProgressivePromise newProgressivePromise() {
return ctx.newProgressivePromise();
}
@Override
public ChannelFuture newSucceededFuture() {
return ctx.newSucceededFuture();
}
@Override
public ChannelFuture newFailedFuture(Throwable cause) {
return ctx.newFailedFuture(cause);
}
@Override
public ChannelPromise voidPromise() {
return ctx.voidPromise();
}
@Override
public Attribute attr(AttributeKey key) {
return ctx.channel().attr(key);
}
@Override
public boolean hasAttr(AttributeKey key) {
return ctx.channel().hasAttr(key);
}
final void remove() {
EventExecutor executor = executor();
if (executor.inEventLoop()) {
remove0();
} else {
executor.execute(new Runnable() {
@Override
public void run() {
remove0();
}
});
}
}
private void remove0() {
if (!removed) {
removed = true;
try {
handler.handlerRemoved(this);
} catch (Throwable cause) {
fireExceptionCaught(new ChannelPipelineException(
handler.getClass().getName() + ".handlerRemoved() has thrown an exception.", cause));
}
}
}
}
}
