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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.netty5.handler.timeout;
import io.netty5.bootstrap.ServerBootstrap;
import io.netty5.channel.Channel;
import io.netty5.channel.ChannelHandler;
import io.netty5.channel.ChannelHandlerContext;
import io.netty5.channel.ChannelInitializer;
import io.netty5.util.concurrent.Future;
import io.netty5.util.concurrent.FutureListener;
import java.util.concurrent.TimeUnit;
import static java.util.Objects.requireNonNull;
/**
* Triggers an {@link IdleStateEvent} when a {@link Channel} has not performed
* read, write, or both operation for a while.
*
* Supported idle states
*
*
* Property Meaning
*
*
* {@code readerIdleTime}
* an {@link IdleStateEvent} whose state is {@link IdleState#READER_IDLE}
* will be triggered when no read was performed for the specified period of
* time. Specify {@code 0} to disable.
*
*
* {@code writerIdleTime}
* an {@link IdleStateEvent} whose state is {@link IdleState#WRITER_IDLE}
* will be triggered when no write was performed for the specified period of
* time. Specify {@code 0} to disable.
*
*
* {@code allIdleTime}
* an {@link IdleStateEvent} whose state is {@link IdleState#ALL_IDLE}
* will be triggered when neither read nor write was performed for the
* specified period of time. Specify {@code 0} to disable.
*
*
*
*
* // An example that sends a ping message when there is no outbound traffic
* // for 30 seconds. The connection is closed when there is no inbound traffic
* // for 60 seconds.
*
* public class MyChannelInitializer extends {@link ChannelInitializer}<{@link Channel}> {
* {@code @Override}
* public void initChannel({@link Channel} channel) {
* channel.pipeline().addLast("idleStateHandler", new {@link IdleStateHandler}(60, 30, 0));
* channel.pipeline().addLast("myHandler", new MyHandler());
* }
* }
*
* // Handler should handle the {@link IdleStateEvent} triggered by {@link IdleStateHandler}.
* public class MyHandler implements {@link ChannelHandler} {
* {@code @Override}
* public void userEventTriggered({@link ChannelHandlerContext} ctx, {@link Object} evt) throws {@link Exception} {
* if (evt instanceof {@link IdleStateEvent}) {
* {@link IdleStateEvent} e = ({@link IdleStateEvent}) evt;
* if (e.state() == {@link IdleState}.READER_IDLE) {
* ctx.close();
* } else if (e.state() == {@link IdleState}.WRITER_IDLE) {
* ctx.writeAndFlush(new PingMessage());
* }
* }
* }
* }
*
* {@link ServerBootstrap} bootstrap = ...;
* ...
* bootstrap.childHandler(new MyChannelInitializer());
* ...
*
*
* @see ReadTimeoutHandler
* @see WriteTimeoutHandler
*/
public class IdleStateHandler implements ChannelHandler {
private static final long MIN_TIMEOUT_NANOS = TimeUnit.MILLISECONDS.toNanos(1);
// Not create a new ChannelFutureListeners per write operation to reduce GC pressure.
private final FutureListener writeListener = future -> {
lastWriteTime = ticksInNanos();
firstWriterIdleEvent = firstAllIdleEvent = true;
};
private final long readerIdleTimeNanos;
private final long writerIdleTimeNanos;
private final long allIdleTimeNanos;
private Future readerIdleTimeout;
private long lastReadTime;
private boolean firstReaderIdleEvent = true;
private Future writerIdleTimeout;
private long lastWriteTime;
private boolean firstWriterIdleEvent = true;
private Future allIdleTimeout;
private boolean firstAllIdleEvent = true;
private byte state; // 0 - none, 1 - initialized, 2 - destroyed
private boolean reading;
/**
* Creates a new instance firing {@link IdleStateEvent}s.
*
* @param readerIdleTimeSeconds
* an {@link IdleStateEvent} whose state is {@link IdleState#READER_IDLE}
* will be triggered when no read was performed for the specified
* period of time. Specify {@code 0} to disable.
* @param writerIdleTimeSeconds
* an {@link IdleStateEvent} whose state is {@link IdleState#WRITER_IDLE}
* will be triggered when no write was performed for the specified
* period of time. Specify {@code 0} to disable.
* @param allIdleTimeSeconds
* an {@link IdleStateEvent} whose state is {@link IdleState#ALL_IDLE}
* will be triggered when neither read nor write was performed for
* the specified period of time. Specify {@code 0} to disable.
*/
public IdleStateHandler(
int readerIdleTimeSeconds,
int writerIdleTimeSeconds,
int allIdleTimeSeconds) {
this(readerIdleTimeSeconds, writerIdleTimeSeconds, allIdleTimeSeconds,
TimeUnit.SECONDS);
}
/**
* Creates a new instance firing {@link IdleStateEvent}s.
* @param readerIdleTime
* an {@link IdleStateEvent} whose state is {@link IdleState#READER_IDLE}
* will be triggered when no read was performed for the specified
* period of time. Specify {@code 0} to disable.
* @param writerIdleTime
* an {@link IdleStateEvent} whose state is {@link IdleState#WRITER_IDLE}
* will be triggered when no write was performed for the specified
* period of time. Specify {@code 0} to disable.
* @param allIdleTime
* an {@link IdleStateEvent} whose state is {@link IdleState#ALL_IDLE}
* will be triggered when neither read nor write was performed for
* the specified period of time. Specify {@code 0} to disable.
* @param unit
* the {@link TimeUnit} of {@code readerIdleTime},
* {@code writeIdleTime}, and {@code allIdleTime}
*/
public IdleStateHandler(long readerIdleTime, long writerIdleTime, long allIdleTime,
TimeUnit unit) {
requireNonNull(unit, "unit");
if (readerIdleTime <= 0) {
readerIdleTimeNanos = 0;
} else {
readerIdleTimeNanos = Math.max(unit.toNanos(readerIdleTime), MIN_TIMEOUT_NANOS);
}
if (writerIdleTime <= 0) {
writerIdleTimeNanos = 0;
} else {
writerIdleTimeNanos = Math.max(unit.toNanos(writerIdleTime), MIN_TIMEOUT_NANOS);
}
if (allIdleTime <= 0) {
allIdleTimeNanos = 0;
} else {
allIdleTimeNanos = Math.max(unit.toNanos(allIdleTime), MIN_TIMEOUT_NANOS);
}
}
/**
* Return the readerIdleTime that was given when instance this class in milliseconds.
*
*/
public long getReaderIdleTimeInMillis() {
return TimeUnit.NANOSECONDS.toMillis(readerIdleTimeNanos);
}
/**
* Return the writerIdleTime that was given when instance this class in milliseconds.
*
*/
public long getWriterIdleTimeInMillis() {
return TimeUnit.NANOSECONDS.toMillis(writerIdleTimeNanos);
}
/**
* Return the allIdleTime that was given when instance this class in milliseconds.
*
*/
public long getAllIdleTimeInMillis() {
return TimeUnit.NANOSECONDS.toMillis(allIdleTimeNanos);
}
@Override
public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
if (ctx.channel().isActive() && ctx.channel().isRegistered()) {
// channelActive() event has been fired already, which means this.channelActive() will
// not be invoked. We have to initialize here instead.
initialize(ctx);
} else {
// channelActive() event has not been fired yet. this.channelActive() will be invoked
// and initialization will occur there.
}
}
@Override
public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
destroy();
}
@Override
public void channelRegistered(ChannelHandlerContext ctx) throws Exception {
// Initialize early if channel is active already.
if (ctx.channel().isActive()) {
initialize(ctx);
}
ctx.fireChannelRegistered();
}
@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
// This method will be invoked only if this handler was added
// before channelActive() event is fired. If a user adds this handler
// after the channelActive() event, initialize() will be called by beforeAdd().
initialize(ctx);
ctx.fireChannelActive();
}
@Override
public void channelInactive(ChannelHandlerContext ctx) throws Exception {
destroy();
ctx.fireChannelInactive();
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
if (readerIdleTimeNanos > 0 || allIdleTimeNanos > 0) {
reading = true;
firstReaderIdleEvent = firstAllIdleEvent = true;
}
ctx.fireChannelRead(msg);
}
@Override
public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
if ((readerIdleTimeNanos > 0 || allIdleTimeNanos > 0) && reading) {
lastReadTime = ticksInNanos();
reading = false;
}
ctx.fireChannelReadComplete();
}
@Override
public Future write(ChannelHandlerContext ctx, Object msg) {
Future future = ctx.write(msg);
// Allow writing with void promise if handler is only configured for read timeout events.
if (writerIdleTimeNanos > 0 || allIdleTimeNanos > 0) {
future.addListener(writeListener);
}
return future;
}
private void initialize(ChannelHandlerContext ctx) {
// Avoid the case where destroy() is called before scheduling timeouts.
// See: https://github.com/netty/netty/issues/143
switch (state) {
case 1:
case 2:
return;
default:
break;
}
state = 1;
lastReadTime = lastWriteTime = ticksInNanos();
if (readerIdleTimeNanos > 0) {
readerIdleTimeout = schedule(ctx, new ReaderIdleTimeoutTask(ctx),
readerIdleTimeNanos, TimeUnit.NANOSECONDS);
}
if (writerIdleTimeNanos > 0) {
writerIdleTimeout = schedule(ctx, new WriterIdleTimeoutTask(ctx),
writerIdleTimeNanos, TimeUnit.NANOSECONDS);
}
if (allIdleTimeNanos > 0) {
allIdleTimeout = schedule(ctx, new AllIdleTimeoutTask(ctx),
allIdleTimeNanos, TimeUnit.NANOSECONDS);
}
}
/**
* This method is visible for testing!
*/
long ticksInNanos() {
return System.nanoTime();
}
/**
* This method is visible for testing!
*/
Future schedule(ChannelHandlerContext ctx, Runnable task, long delay, TimeUnit unit) {
return ctx.executor().schedule(task, delay, unit);
}
private void destroy() {
state = 2;
if (readerIdleTimeout != null) {
readerIdleTimeout.cancel();
readerIdleTimeout = null;
}
if (writerIdleTimeout != null) {
writerIdleTimeout.cancel();
writerIdleTimeout = null;
}
if (allIdleTimeout != null) {
allIdleTimeout.cancel();
allIdleTimeout = null;
}
}
/**
* Is called when an {@link IdleStateEvent} should be fired. This implementation calls
* {@link ChannelHandlerContext#fireChannelInboundEvent(Object)}.
*/
protected void channelIdle(ChannelHandlerContext ctx, IdleStateEvent evt) throws Exception {
ctx.fireChannelInboundEvent(evt);
}
/**
* Returns a {@link IdleStateEvent}.
*/
protected IdleStateEvent newIdleStateEvent(IdleState state, boolean first) {
switch (state) {
case ALL_IDLE:
return first ? IdleStateEvent.FIRST_ALL_IDLE_STATE_EVENT : IdleStateEvent.ALL_IDLE_STATE_EVENT;
case READER_IDLE:
return first ? IdleStateEvent.FIRST_READER_IDLE_STATE_EVENT : IdleStateEvent.READER_IDLE_STATE_EVENT;
case WRITER_IDLE:
return first ? IdleStateEvent.FIRST_WRITER_IDLE_STATE_EVENT : IdleStateEvent.WRITER_IDLE_STATE_EVENT;
default:
throw new IllegalArgumentException("Unhandled: state=" + state + ", first=" + first);
}
}
private abstract static class AbstractIdleTask implements Runnable {
private final ChannelHandlerContext ctx;
AbstractIdleTask(ChannelHandlerContext ctx) {
this.ctx = ctx;
}
@Override
public void run() {
if (!ctx.channel().isOpen()) {
return;
}
run(ctx);
}
protected abstract void run(ChannelHandlerContext ctx);
}
private final class ReaderIdleTimeoutTask extends AbstractIdleTask {
ReaderIdleTimeoutTask(ChannelHandlerContext ctx) {
super(ctx);
}
@Override
protected void run(ChannelHandlerContext ctx) {
long nextDelay = readerIdleTimeNanos;
if (!reading) {
nextDelay -= ticksInNanos() - lastReadTime;
}
if (nextDelay <= 0) {
// Reader is idle - set a new timeout and notify the callback.
readerIdleTimeout = schedule(ctx, this, readerIdleTimeNanos, TimeUnit.NANOSECONDS);
boolean first = firstReaderIdleEvent;
firstReaderIdleEvent = false;
try {
IdleStateEvent event = newIdleStateEvent(IdleState.READER_IDLE, first);
channelIdle(ctx, event);
} catch (Throwable t) {
ctx.fireChannelExceptionCaught(t);
}
} else {
// Read occurred before the timeout - set a new timeout with shorter delay.
readerIdleTimeout = schedule(ctx, this, nextDelay, TimeUnit.NANOSECONDS);
}
}
}
private final class WriterIdleTimeoutTask extends AbstractIdleTask {
WriterIdleTimeoutTask(ChannelHandlerContext ctx) {
super(ctx);
}
@Override
protected void run(ChannelHandlerContext ctx) {
long lastWriteTime = IdleStateHandler.this.lastWriteTime;
long nextDelay = writerIdleTimeNanos - (ticksInNanos() - lastWriteTime);
if (nextDelay <= 0) {
// Writer is idle - set a new timeout and notify the callback.
writerIdleTimeout = schedule(ctx, this, writerIdleTimeNanos, TimeUnit.NANOSECONDS);
boolean first = firstWriterIdleEvent;
firstWriterIdleEvent = false;
try {
IdleStateEvent event = newIdleStateEvent(IdleState.WRITER_IDLE, first);
channelIdle(ctx, event);
} catch (Throwable t) {
ctx.fireChannelExceptionCaught(t);
}
} else {
// Write occurred before the timeout - set a new timeout with shorter delay.
writerIdleTimeout = schedule(ctx, this, nextDelay, TimeUnit.NANOSECONDS);
}
}
}
private final class AllIdleTimeoutTask extends AbstractIdleTask {
AllIdleTimeoutTask(ChannelHandlerContext ctx) {
super(ctx);
}
@Override
protected void run(ChannelHandlerContext ctx) {
long nextDelay = allIdleTimeNanos;
if (!reading) {
nextDelay -= ticksInNanos() - Math.max(lastReadTime, lastWriteTime);
}
if (nextDelay <= 0) {
// Both reader and writer are idle - set a new timeout and
// notify the callback.
allIdleTimeout = schedule(ctx, this, allIdleTimeNanos, TimeUnit.NANOSECONDS);
boolean first = firstAllIdleEvent;
firstAllIdleEvent = false;
try {
IdleStateEvent event = newIdleStateEvent(IdleState.ALL_IDLE, first);
channelIdle(ctx, event);
} catch (Throwable t) {
ctx.fireChannelExceptionCaught(t);
}
} else {
// Either read or write occurred before the timeout - set a new
// timeout with shorter delay.
allIdleTimeout = schedule(ctx, this, nextDelay, TimeUnit.NANOSECONDS);
}
}
}
}
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