org.apache.sshd.common.channel

Interface ChannelListener

All Superinterfaces:

EventListener, SshdEventListener

public interface ChannelListener
extends SshdEventListener

Provides a simple listener for client / server channels being established or torn down. Note: for server-side listeners, some of the established channels may be client - especially where connection proxy or forwarding is concerned

Author:

Apache MINA SSHD Project

Field Summary

Fields

Modifier and Type	Field and Description
static ChannelListener	EMPTY

Method Summary

Modifier and Type	Method and Description
default void	channelClosed(Channel channel, Throwable reason) Called to inform about a channel being closed.
default void	channelInitialized(Channel channel) Called to inform about initial setup of a channel via the Channel.init(org.apache.sshd.common.session.ConnectionService, org.apache.sshd.common.session.Session, int) method.
default void	channelOpenFailure(Channel channel, Throwable reason) Called to inform about the failure to open a channel
default void	channelOpenSuccess(Channel channel) Called to inform about a channel being successfully opened for a session.
default void	channelStateChanged(Channel channel, String hint) Called to inform that the channel state may have changed - e.g., received EOF, window adjustment, etc..
static <L extends ChannelListener> L	validateListener(L listener)

Methods inherited from interface org.apache.sshd.common.util.SshdEventListener

validateListener

Field Detail

EMPTY

static final ChannelListener EMPTY

Method Detail

channelInitialized

default void channelInitialized(Channel channel)

Called to inform about initial setup of a channel via the Channel.init(org.apache.sshd.common.session.ConnectionService, org.apache.sshd.common.session.Session, int) method. Note: this method is guaranteed to be called before either of the channelOpenSuccess(Channel) or channelOpenFailure(Channel, Throwable) will be called

Parameters:

channel - The initialized Channel

channelOpenSuccess

default void channelOpenSuccess(Channel channel)

Called to inform about a channel being successfully opened for a session. Note: when the call is made, the channel is known to be open but nothing beyond that.

Parameters:

channel - The newly opened Channel

channelOpenFailure

default void channelOpenFailure(Channel channel,
                                Throwable reason)

Called to inform about the failure to open a channel

Parameters:

channel - The failed Channel

reason - The Throwable reason - Note: if the channelOpenSuccess(Channel) notification throws an exception it will cause this method to be invoked

channelStateChanged

default void channelStateChanged(Channel channel,
                                 String hint)

Called to inform that the channel state may have changed - e.g., received EOF, window adjustment, etc..

Parameters:

channel - The Channel whose state has changed

hint - A "hint" as to the nature of the state change. it can be a request name or a SSH_MSG_CHANNEL_XXX command or the name of an exception class

channelClosed

default void channelClosed(Channel channel,
                           Throwable reason)

Called to inform about a channel being closed. Note: when the call is made there are no guarantees about the channel's actual state except that it either has been already closed or may be in the process of being closed. Note: this method is guaranteed to be called regardless of whether channelOpenSuccess(Channel) or channelOpenFailure(Channel, Throwable) have been called

Parameters:

channel - The referenced Channel

reason - The reason why the channel is being closed - if null then normal closure

validateListener

static <L extends ChannelListener> L validateListener(L listener)