io.netty.handler.timeout

Class IdleStateHandler

java.lang.Object

io.netty.channel.ChannelHandlerAdapter

io.netty.channel.ChannelInboundHandlerAdapter

io.netty.channel.ChannelDuplexHandler

io.netty.handler.timeout.IdleStateHandler

All Implemented Interfaces:

ChannelHandler, ChannelInboundHandler, ChannelOutboundHandler

Direct Known Subclasses:

ReadTimeoutHandler

public class IdleStateHandler
extends ChannelDuplexHandler

Triggers an IdleStateEvent when a Channel has not performed read, write, or both operation for a while.

Supported idle states

Property	Meaning
readerIdleTime	an IdleStateEvent whose state is IdleState.READER_IDLE will be triggered when no read was performed for the specified period of time. Specify 0 to disable.
writerIdleTime	an IdleStateEvent whose state is IdleState.WRITER_IDLE will be triggered when no write was performed for the specified period of time. Specify 0 to disable.
allIdleTime	an IdleStateEvent whose state is IdleState.ALL_IDLE will be triggered when neither read nor write was performed for the specified period of time. Specify 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 ChannelInitializer<Channel> {
      @Override
     public void initChannel(Channel channel) {
         channel.pipeline().addLast("idleStateHandler", new IdleStateHandler(60, 30, 0));
         channel.pipeline().addLast("myHandler", new MyHandler());
     }
 }

 // Handler should handle the IdleStateEvent triggered by IdleStateHandler.
 public class MyHandler extends ChannelDuplexHandler {
      @Override
     public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
         if (evt instanceof IdleStateEvent) {
             IdleStateEvent e = (IdleStateEvent) evt;
             if (e.state() == IdleState.READER_IDLE) {
                 ctx.close();
             } else if (e.state() == IdleState.WRITER_IDLE) {
                 ctx.writeAndFlush(new PingMessage());
             }
         }
     }
 }

 ServerBootstrap bootstrap = ...;
 ...
 bootstrap.childHandler(new MyChannelInitializer());
 ...
 

See Also:

ReadTimeoutHandler, WriteTimeoutHandler

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private class	IdleStateHandler.AllIdleTimeoutTask
private class	IdleStateHandler.ReaderIdleTimeoutTask
private class	IdleStateHandler.WriterIdleTimeoutTask

Nested classes/interfaces inherited from interface io.netty.channel.ChannelHandler

ChannelHandler.Sharable

Field Summary

Fields

Modifier and Type	Field and Description
private long	allIdleTimeNanos
private java.util.concurrent.ScheduledFuture<?>	allIdleTimeout
private boolean	firstAllIdleEvent
private boolean	firstReaderIdleEvent
private boolean	firstWriterIdleEvent
private long	lastReadTime
private long	lastWriteTime
private static long	MIN_TIMEOUT_NANOS
private long	readerIdleTimeNanos
private java.util.concurrent.ScheduledFuture<?>	readerIdleTimeout
private boolean	reading
private byte	state
private ChannelFutureListener	writeListener
private long	writerIdleTimeNanos
private java.util.concurrent.ScheduledFuture<?>	writerIdleTimeout

Constructor Summary

Constructors

Constructor and Description
IdleStateHandler(int readerIdleTimeSeconds, int writerIdleTimeSeconds, int allIdleTimeSeconds) Creates a new instance firing IdleStateEvents.
IdleStateHandler(long readerIdleTime, long writerIdleTime, long allIdleTime, java.util.concurrent.TimeUnit unit) Creates a new instance firing IdleStateEvents.

Method Summary

Modifier and Type	Method and Description
void	channelActive(ChannelHandlerContext ctx) Calls ChannelHandlerContext.fireChannelActive() to forward to the next ChannelInboundHandler in the ChannelPipeline.
protected void	channelIdle(ChannelHandlerContext ctx, IdleStateEvent evt) Is called when an IdleStateEvent should be fired.
void	channelInactive(ChannelHandlerContext ctx) Calls ChannelHandlerContext.fireChannelInactive() to forward to the next ChannelInboundHandler in the ChannelPipeline.
void	channelRead(ChannelHandlerContext ctx, java.lang.Object msg) Calls ChannelHandlerContext.fireChannelRead(Object) to forward to the next ChannelInboundHandler in the ChannelPipeline.
void	channelReadComplete(ChannelHandlerContext ctx) Calls ChannelHandlerContext.fireChannelReadComplete() to forward to the next ChannelInboundHandler in the ChannelPipeline.
void	channelRegistered(ChannelHandlerContext ctx) Calls ChannelHandlerContext.fireChannelRegistered() to forward to the next ChannelInboundHandler in the ChannelPipeline.
private void	destroy()
long	getAllIdleTimeInMillis() Return the allIdleTime that was given when instance this class in milliseconds.
long	getReaderIdleTimeInMillis() Return the readerIdleTime that was given when instance this class in milliseconds.
long	getWriterIdleTimeInMillis() Return the writerIdleTime that was given when instance this class in milliseconds.
void	handlerAdded(ChannelHandlerContext ctx) Do nothing by default, sub-classes may override this method.
void	handlerRemoved(ChannelHandlerContext ctx) Do nothing by default, sub-classes may override this method.
private void	initialize(ChannelHandlerContext ctx)
protected IdleStateEvent	newIdleStateEvent(IdleState state, boolean first) Returns a IdleStateEvent.
void	write(ChannelHandlerContext ctx, java.lang.Object msg, ChannelPromise promise) Calls ChannelHandlerContext.write(Object, ChannelPromise) to forward to the next ChannelOutboundHandler in the ChannelPipeline.

Methods inherited from class io.netty.channel.ChannelDuplexHandler

bind, close, connect, deregister, disconnect, flush, read

Methods inherited from class io.netty.channel.ChannelInboundHandlerAdapter

channelUnregistered, channelWritabilityChanged, exceptionCaught, userEventTriggered

Methods inherited from class io.netty.channel.ChannelHandlerAdapter

isSharable

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface io.netty.channel.ChannelHandler

exceptionCaught

Field Detail

MIN_TIMEOUT_NANOS

private static final long MIN_TIMEOUT_NANOS

writeListener

private final ChannelFutureListener writeListener

readerIdleTimeNanos

private final long readerIdleTimeNanos

writerIdleTimeNanos

private final long writerIdleTimeNanos

allIdleTimeNanos

private final long allIdleTimeNanos

readerIdleTimeout

private java.util.concurrent.ScheduledFuture<?> readerIdleTimeout

lastReadTime

private long lastReadTime

firstReaderIdleEvent

private boolean firstReaderIdleEvent

writerIdleTimeout

private java.util.concurrent.ScheduledFuture<?> writerIdleTimeout

lastWriteTime

private long lastWriteTime

firstWriterIdleEvent

private boolean firstWriterIdleEvent

allIdleTimeout

private java.util.concurrent.ScheduledFuture<?> allIdleTimeout

firstAllIdleEvent

private boolean firstAllIdleEvent

state

private byte state

reading

private boolean reading

Constructor Detail

IdleStateHandler

public IdleStateHandler(int readerIdleTimeSeconds,
                        int writerIdleTimeSeconds,
                        int allIdleTimeSeconds)

Creates a new instance firing IdleStateEvents.

Parameters:

readerIdleTimeSeconds - an IdleStateEvent whose state is IdleState.READER_IDLE will be triggered when no read was performed for the specified period of time. Specify 0 to disable.

writerIdleTimeSeconds - an IdleStateEvent whose state is IdleState.WRITER_IDLE will be triggered when no write was performed for the specified period of time. Specify 0 to disable.

allIdleTimeSeconds - an IdleStateEvent whose state is IdleState.ALL_IDLE will be triggered when neither read nor write was performed for the specified period of time. Specify 0 to disable.

IdleStateHandler

public IdleStateHandler(long readerIdleTime,
                        long writerIdleTime,
                        long allIdleTime,
                        java.util.concurrent.TimeUnit unit)

Creates a new instance firing IdleStateEvents.

Parameters:

readerIdleTime - an IdleStateEvent whose state is IdleState.READER_IDLE will be triggered when no read was performed for the specified period of time. Specify 0 to disable.

writerIdleTime - an IdleStateEvent whose state is IdleState.WRITER_IDLE will be triggered when no write was performed for the specified period of time. Specify 0 to disable.

allIdleTime - an IdleStateEvent whose state is IdleState.ALL_IDLE will be triggered when neither read nor write was performed for the specified period of time. Specify 0 to disable.

unit - the TimeUnit of readerIdleTime, writeIdleTime, and allIdleTime

Method Detail

getReaderIdleTimeInMillis

public long getReaderIdleTimeInMillis()

Return the readerIdleTime that was given when instance this class in milliseconds.

getWriterIdleTimeInMillis

public long getWriterIdleTimeInMillis()

Return the writerIdleTime that was given when instance this class in milliseconds.

getAllIdleTimeInMillis

public long getAllIdleTimeInMillis()

Return the allIdleTime that was given when instance this class in milliseconds.

handlerAdded

public void handlerAdded(ChannelHandlerContext ctx)
                  throws java.lang.Exception

Description copied from class: ChannelHandlerAdapter

Do nothing by default, sub-classes may override this method.

Specified by:

handlerAdded in interface ChannelHandler

Overrides:

handlerAdded in class ChannelHandlerAdapter

Throws:

java.lang.Exception

handlerRemoved

public void handlerRemoved(ChannelHandlerContext ctx)
                    throws java.lang.Exception

Description copied from class: ChannelHandlerAdapter

Do nothing by default, sub-classes may override this method.

Specified by:

handlerRemoved in interface ChannelHandler

Overrides:

handlerRemoved in class ChannelHandlerAdapter

Throws:

java.lang.Exception

channelRegistered

public void channelRegistered(ChannelHandlerContext ctx)
                       throws java.lang.Exception

Description copied from class: ChannelInboundHandlerAdapter

Calls ChannelHandlerContext.fireChannelRegistered() to forward to the next ChannelInboundHandler in the ChannelPipeline. Sub-classes may override this method to change behavior.

Specified by:

channelRegistered in interface ChannelInboundHandler

Overrides:

channelRegistered in class ChannelInboundHandlerAdapter

Throws:

java.lang.Exception

channelActive

public void channelActive(ChannelHandlerContext ctx)
                   throws java.lang.Exception

Description copied from class: ChannelInboundHandlerAdapter

Calls ChannelHandlerContext.fireChannelActive() to forward to the next ChannelInboundHandler in the ChannelPipeline. Sub-classes may override this method to change behavior.

Specified by:

channelActive in interface ChannelInboundHandler

Overrides:

channelActive in class ChannelInboundHandlerAdapter

Throws:

java.lang.Exception

channelInactive

public void channelInactive(ChannelHandlerContext ctx)
                     throws java.lang.Exception

Description copied from class: ChannelInboundHandlerAdapter

Calls ChannelHandlerContext.fireChannelInactive() to forward to the next ChannelInboundHandler in the ChannelPipeline. Sub-classes may override this method to change behavior.

Specified by:

channelInactive in interface ChannelInboundHandler

Overrides:

channelInactive in class ChannelInboundHandlerAdapter

Throws:

java.lang.Exception

channelRead

public void channelRead(ChannelHandlerContext ctx,
                        java.lang.Object msg)
                 throws java.lang.Exception

Description copied from class: ChannelInboundHandlerAdapter

Calls ChannelHandlerContext.fireChannelRead(Object) to forward to the next ChannelInboundHandler in the ChannelPipeline. Sub-classes may override this method to change behavior.

Specified by:

channelRead in interface ChannelInboundHandler

Overrides:

channelRead in class ChannelInboundHandlerAdapter

Throws:

java.lang.Exception

channelReadComplete

public void channelReadComplete(ChannelHandlerContext ctx)
                         throws java.lang.Exception

Description copied from class: ChannelInboundHandlerAdapter

Calls ChannelHandlerContext.fireChannelReadComplete() to forward to the next ChannelInboundHandler in the ChannelPipeline. Sub-classes may override this method to change behavior.

Specified by:

channelReadComplete in interface ChannelInboundHandler

Overrides:

channelReadComplete in class ChannelInboundHandlerAdapter

Throws:

java.lang.Exception

write

public void write(ChannelHandlerContext ctx,
                  java.lang.Object msg,
                  ChannelPromise promise)
           throws java.lang.Exception

Description copied from class: ChannelDuplexHandler

Calls ChannelHandlerContext.write(Object, ChannelPromise) to forward to the next ChannelOutboundHandler in the ChannelPipeline. Sub-classes may override this method to change behavior.

Specified by:

write in interface ChannelOutboundHandler

Overrides:

write in class ChannelDuplexHandler

Parameters:

ctx - the ChannelHandlerContext for which the write operation is made

msg - the message to write

promise - the ChannelPromise to notify once the operation completes

Throws:

java.lang.Exception - thrown if an error accour

initialize

private void initialize(ChannelHandlerContext ctx)

destroy

private void destroy()

channelIdle

protected void channelIdle(ChannelHandlerContext ctx,
                           IdleStateEvent evt)
                    throws java.lang.Exception

Is called when an IdleStateEvent should be fired. This implementation calls ChannelHandlerContext.fireUserEventTriggered(Object).

Throws:

java.lang.Exception

newIdleStateEvent

protected IdleStateEvent newIdleStateEvent(IdleState state,
                                           boolean first)

Returns a IdleStateEvent.