org.apache.sshd.client.channel.exit

Class AbstractChannelExitRequestHandler<V>

java.lang.Object

org.apache.sshd.common.util.logging.AbstractLoggingBean

org.apache.sshd.common.channel.AbstractRequestHandler<Channel>

org.apache.sshd.common.channel.AbstractChannelRequestHandler

org.apache.sshd.client.channel.exit.AbstractChannelExitRequestHandler<V>

Type Parameters:

V - Type of data being extracted from the request when processed

All Implemented Interfaces:

ChannelRequestHandler, RequestHandler<Channel>, NamedResource

Direct Known Subclasses:

ExitSignalChannelRequestHandler, ExitStatusChannelRequestHandler

public abstract class AbstractChannelExitRequestHandler<V>
extends AbstractChannelRequestHandler
implements NamedResource

Provides a common base class for channel request handlers that deal with various "exit-XXX" requests. Once such a request has been successfully processed, an EventNotifier can be invoked indicating the processed event.

Author:

Apache MINA SSHD Project

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.sshd.common.channel.RequestHandler

RequestHandler.Result

Field Summary

Fields

Modifier and Type	Field and Description
protected AtomicReference<V>	holder
protected EventNotifier<? super String>	notifier

Fields inherited from class org.apache.sshd.common.util.logging.AbstractLoggingBean

log

Fields inherited from interface org.apache.sshd.common.NamedResource

BY_NAME_COMPARATOR, NAME_EXTRACTOR

Fields inherited from interface org.apache.sshd.common.channel.ChannelRequestHandler

CHANN2HNDLR

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractChannelExitRequestHandler(AtomicReference<V> holder, EventNotifier<? super String> notifier)

Method Summary

Modifier and Type	Method and Description
protected String	getEvent(Channel channel, String request, V value)
protected void	notifyStateChanged(Channel channel, String request, V value) Notifies that some change has been made to the data in the holder.
RequestHandler.Result	process(Channel channel, String request, boolean wantReply, Buffer buffer) Process an SSH request.
protected abstract V	processRequestValue(Channel channel, String request, Buffer buffer) Invoked by default from process(Channel, String, boolean, Buffer) when a request matching the handler's name is received

Methods inherited from class org.apache.sshd.common.util.logging.AbstractLoggingBean

getSimplifiedLogger

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.sshd.common.NamedResource

findByName, getName, getNameList, getNames, ofName, removeByName

Field Detail

holder

protected final AtomicReference<V> holder

notifier

protected final EventNotifier<? super String> notifier

Constructor Detail

AbstractChannelExitRequestHandler

protected AbstractChannelExitRequestHandler(AtomicReference<V> holder,
                                            EventNotifier<? super String> notifier)

Parameters:

holder - An AtomicReference that will hold the extracted request data

notifier - An EventNotifier to be invoked when request is successfully processed and the holder has been updated with the processed request data

Method Detail

process

public RequestHandler.Result process(Channel channel,
                                     String request,
                                     boolean wantReply,
                                     Buffer buffer)
                              throws Exception

Description copied from interface: RequestHandler

Process an SSH request. If an exception is thrown, the ConnectionService will send a failure message if needed and the request will be considered handled.

Specified by:

process in interface ChannelRequestHandler

Specified by:

process in interface RequestHandler<Channel>

Parameters:

channel - The input parameter

request - The request string

wantReply - Whether a reply is requested

buffer - The Buffer with request specific data

Returns:

The RequestHandler.Result

Throws:

Exception - If failed to handle the request - Note: in order to signal an unsupported request the RequestHandler.Result.Unsupported value should be returned

processRequestValue

protected abstract V processRequestValue(Channel channel,
                                         String request,
                                         Buffer buffer)
                                  throws Exception

Invoked by default from process(Channel, String, boolean, Buffer) when a request matching the handler's name is received

Parameters:

channel - The Channel through which the request was received

request - The received request - Note: guaranteed to match the handler's name if invoked from process(Channel, String, boolean, Buffer)

buffer - The received Buffer for extracting the data

Returns:

The extracted data - if null then request is ignored and Unsupported is returned

Throws:

Exception - If failed to process the received request buffer

notifyStateChanged

protected void notifyStateChanged(Channel channel,
                                  String request,
                                  V value)

Notifies that some change has been made to the data in the holder. The reported event is obtained via the getEvent(Channel, String, Object) call

Parameters:

channel - The Channel through which the request was received

request - The processed request

value - The processed value

getEvent

protected String getEvent(Channel channel,
                          String request,
                          V value)

Parameters:

channel - The Channel through which the request was received

request - The processed request

value - The processed value

Returns:

The event name to be used - default: NamedResource.getName() value