io.netty.channel.nio

Class NioEventLoop

java.lang.Object

java.util.concurrent.AbstractExecutorService

io.netty.util.concurrent.AbstractEventExecutor

io.netty.util.concurrent.AbstractScheduledEventExecutor

io.netty.util.concurrent.SingleThreadEventExecutor

io.netty.channel.SingleThreadEventLoop

io.netty.channel.nio.NioEventLoop

All Implemented Interfaces:

EventLoop, EventLoopGroup, EventExecutor, EventExecutorGroup, OrderedEventExecutor, java.lang.Iterable<EventExecutor>, java.util.concurrent.Executor, java.util.concurrent.ExecutorService, java.util.concurrent.ScheduledExecutorService

public final class NioEventLoop
extends SingleThreadEventLoop

SingleThreadEventLoop implementation which register the Channel's to a Selector and so does the multi-plexing of these in the event loop.

Field Summary

Fields inherited from class io.netty.channel.SingleThreadEventLoop

DEFAULT_MAX_PENDING_TASKS

Method Summary

Modifier and Type	Method and Description
protected void	cleanup() Do nothing, sub-classes may override
int	getIoRatio() Returns the percentage of the desired amount of time spent for I/O in the event loop.
protected java.util.Queue<java.lang.Runnable>	newTaskQueue(int maxPendingTasks) Create a new Queue which will holds the tasks to execute.
int	pendingTasks() Return the number of tasks that are pending for processing.
protected java.lang.Runnable	pollTask()
void	rebuildSelector() Replaces the current Selector of this event loop with newly created Selectors to work around the infamous epoll 100% CPU bug.
void	register(java.nio.channels.SelectableChannel ch, int interestOps, NioTask<?> task) Registers an arbitrary SelectableChannel, not necessarily created by Netty, to the Selector of this event loop.
protected void	run()
java.nio.channels.spi.SelectorProvider	selectorProvider() Returns the SelectorProvider used by this NioEventLoop to obtain the Selector.
void	setIoRatio(int ioRatio) Sets the percentage of the desired amount of time spent for I/O in the event loop.
protected void	wakeup(boolean inEventLoop)

Methods inherited from class io.netty.channel.SingleThreadEventLoop

next, parent, register, register, wakesUpForTask

Methods inherited from class io.netty.util.concurrent.SingleThreadEventExecutor

addShutdownHook, addTask, awaitTermination, confirmShutdown, delayNanos, execute, hasTasks, inEventLoop, interruptThread, invokeAll, invokeAll, invokeAny, invokeAny, isShutdown, isShuttingDown, isTerminated, newTaskQueue, peekTask, reject, removeShutdownHook, removeTask, runAllTasks, runAllTasks, shutdown, shutdownGracefully, takeTask, terminationFuture, threadProperties, updateLastExecutionTime

Methods inherited from class io.netty.util.concurrent.AbstractScheduledEventExecutor

cancelScheduledTasks, hasScheduledTasks, nanoTime, nextScheduledTaskNano, pollScheduledTask, pollScheduledTask, schedule, schedule, scheduleAtFixedRate, scheduleWithFixedDelay

Methods inherited from class io.netty.util.concurrent.AbstractEventExecutor

inEventLoop, iterator, newFailedFuture, newProgressivePromise, newPromise, newSucceededFuture, newTaskFor, newTaskFor, shutdownGracefully, shutdownNow, submit, submit, submit

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.netty.util.concurrent.EventExecutor

inEventLoop, inEventLoop, newFailedFuture, newProgressivePromise, newPromise, newSucceededFuture

Methods inherited from interface io.netty.util.concurrent.EventExecutorGroup

isShuttingDown, iterator, schedule, schedule, scheduleAtFixedRate, scheduleWithFixedDelay, shutdown, shutdownGracefully, shutdownGracefully, shutdownNow, submit, submit, submit, terminationFuture

Methods inherited from interface java.util.concurrent.ExecutorService

awaitTermination, invokeAll, invokeAll, invokeAny, invokeAny, isShutdown, isTerminated

Methods inherited from interface java.util.concurrent.Executor

execute

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Method Detail

selectorProvider

public java.nio.channels.spi.SelectorProvider selectorProvider()

Returns the SelectorProvider used by this NioEventLoop to obtain the Selector.

newTaskQueue

protected java.util.Queue<java.lang.Runnable> newTaskQueue(int maxPendingTasks)

Description copied from class: SingleThreadEventExecutor

Create a new Queue which will holds the tasks to execute. This default implementation will return a LinkedBlockingQueue but if your sub-class of SingleThreadEventExecutor will not do any blocking calls on the this Queue it may make sense to @Override this and return some more performant implementation that does not support blocking operations at all.

Overrides:

newTaskQueue in class SingleThreadEventExecutor

pendingTasks

public int pendingTasks()

Description copied from class: SingleThreadEventExecutor

Return the number of tasks that are pending for processing. Be aware that this operation may be expensive as it depends on the internal implementation of the SingleThreadEventExecutor. So use it was care!

Overrides:

pendingTasks in class SingleThreadEventExecutor

register

public void register(java.nio.channels.SelectableChannel ch,
                     int interestOps,
                     NioTask<?> task)

Registers an arbitrary SelectableChannel, not necessarily created by Netty, to the Selector of this event loop. Once the specified SelectableChannel is registered, the specified task will be executed by this event loop when the SelectableChannel is ready.

getIoRatio

public int getIoRatio()

Returns the percentage of the desired amount of time spent for I/O in the event loop.

setIoRatio

public void setIoRatio(int ioRatio)

Sets the percentage of the desired amount of time spent for I/O in the event loop. The default value is 50, which means the event loop will try to spend the same amount of time for I/O as for non-I/O tasks.

rebuildSelector

public void rebuildSelector()

Replaces the current Selector of this event loop with newly created Selectors to work around the infamous epoll 100% CPU bug.

run

protected void run()

Specified by:

run in class SingleThreadEventExecutor

cleanup

protected void cleanup()

Description copied from class: SingleThreadEventExecutor

Do nothing, sub-classes may override

Overrides:

cleanup in class SingleThreadEventExecutor

pollTask

protected java.lang.Runnable pollTask()

Overrides:

pollTask in class SingleThreadEventExecutor

See Also:

Queue.poll()

wakeup

protected void wakeup(boolean inEventLoop)

Overrides:

wakeup in class SingleThreadEventExecutor