Package org.apache.mina.proxy.filter

Class ProxyFilter

java.lang.Object

org.apache.mina.core.filterchain.IoFilterAdapter

org.apache.mina.proxy.filter.ProxyFilter

All Implemented Interfaces:

IoFilter

public class ProxyFilter
extends IoFilterAdapter

ProxyFilter.java - Proxy IoFilter. Automatically inserted into the IoFilter chain by ProxyConnector. Sends the initial handshake message to the proxy and handles any response to the handshake. Once the handshake has completed and the proxied connection has been established this filter becomes transparent to data flowing through the connection.

Based upon SSLFilter from mina-filter-ssl.

Since:

MINA 2.0.0-M3

Author:

Apache MINA Project

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.mina.core.filterchain.IoFilter

IoFilter.NextFilter

Constructor Summary

Constructors

Constructor	Description
ProxyFilter()	Create a new ProxyFilter.

Method Summary

Modifier and Type	Method	Description
void	exceptionCaught(IoFilter.NextFilter nextFilter, IoSession session, Throwable cause)	Called when an exception occurs in the chain.
void	filterWrite(IoFilter.NextFilter nextFilter, IoSession session, WriteRequest writeRequest)	Filters outgoing writes, queueing them up if necessary while a handshake is ongoing.
void	messageReceived(IoFilter.NextFilter nextFilter, IoSession session, Object message)	Receives data from the remote host, passes to the handler if a handshake is in progress, otherwise passes on transparently.
void	messageSent(IoFilter.NextFilter nextFilter, IoSession session, WriteRequest writeRequest)	Filter handshake related messages from reaching the messageSent callbacks of downstream filters.
void	onPreAdd(IoFilterChain chain, String name, IoFilter.NextFilter nextFilter)	Called before the filter is added into the filter chain.
void	onPreRemove(IoFilterChain chain, String name, IoFilter.NextFilter nextFilter)	Called when the filter is removed from the filter chain.
void	sessionClosed(IoFilter.NextFilter nextFilter, IoSession session)	Event is stored in an IoSessionEventQueue for later delivery to the next filter in the chain when the handshake would have succeed.
void	sessionCreated(IoFilter.NextFilter nextFilter, IoSession session)	Called when the session is created.
void	sessionIdle(IoFilter.NextFilter nextFilter, IoSession session, IdleStatus status)	Event is stored in an IoSessionEventQueue for later delivery to the next filter in the chain when the handshake would have succeed.
void	sessionOpened(IoFilter.NextFilter nextFilter, IoSession session)	Event is stored in an IoSessionEventQueue for later delivery to the next filter in the chain when the handshake would have succeed.
void	writeData(IoFilter.NextFilter nextFilter, IoSession session, WriteRequest writeRequest, boolean isHandshakeData)	Actually write data.

Methods inherited from class org.apache.mina.core.filterchain.IoFilterAdapter

destroy, event, filterClose, init, inputClosed, onPostAdd, onPostRemove, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

ProxyFilter

public ProxyFilter()

Create a new ProxyFilter.

Method Detail

onPreAdd

public void onPreAdd(IoFilterChain chain,
                     String name,
                     IoFilter.NextFilter nextFilter)

Called before the filter is added into the filter chain. Checks if chain already holds an ProxyFilter instance.

Specified by:

onPreAdd in interface IoFilter

Overrides:

onPreAdd in class IoFilterAdapter

Parameters:

chain - the filter chain

name - the name assigned to this filter

nextFilter - the next filter

Throws:

IllegalStateException - if chain already contains an instance of ProxyFilter

onPreRemove

public void onPreRemove(IoFilterChain chain,
                        String name,
                        IoFilter.NextFilter nextFilter)

Called when the filter is removed from the filter chain. Cleans the ProxyIoSession instance from the session.

Specified by:

onPreRemove in interface IoFilter

Overrides:

onPreRemove in class IoFilterAdapter

Parameters:

chain - the filter chain

name - the name assigned to this filter

nextFilter - the next filter

exceptionCaught

public void exceptionCaught(IoFilter.NextFilter nextFilter,
                            IoSession session,
                            Throwable cause)
                     throws Exception

Called when an exception occurs in the chain. A flag is set in the ProxyIoSession session's instance to signal that handshake failed.

Specified by:

exceptionCaught in interface IoFilter

Overrides:

exceptionCaught in class IoFilterAdapter

Parameters:

nextFilter - next filter in the filter chain

session - the MINA session

cause - the original exception

Throws:

Exception - If an error occurred while processing the event

messageReceived

public void messageReceived(IoFilter.NextFilter nextFilter,
                            IoSession session,
                            Object message)
                     throws ProxyAuthException

Receives data from the remote host, passes to the handler if a handshake is in progress, otherwise passes on transparently.

Specified by:

messageReceived in interface IoFilter

Overrides:

messageReceived in class IoFilterAdapter

Parameters:

nextFilter - the next filter in filter chain

session - the session object

message - the object holding the received data

Throws:

ProxyAuthException

filterWrite

public void filterWrite(IoFilter.NextFilter nextFilter,
                        IoSession session,
                        WriteRequest writeRequest)

Filters outgoing writes, queueing them up if necessary while a handshake is ongoing.

Specified by:

filterWrite in interface IoFilter

Overrides:

filterWrite in class IoFilterAdapter

Parameters:

nextFilter - the next filter in filter chain

session - the session object

writeRequest - the data to write

writeData

public void writeData(IoFilter.NextFilter nextFilter,
                      IoSession session,
                      WriteRequest writeRequest,
                      boolean isHandshakeData)

Actually write data. Queues the data up unless it relates to the handshake or the handshake is done.

Parameters:

nextFilter - the next filter in filter chain

session - the session object

writeRequest - the data to write

isHandshakeData - true if writeRequest is written by the proxy classes.

messageSent

public void messageSent(IoFilter.NextFilter nextFilter,
                        IoSession session,
                        WriteRequest writeRequest)
                 throws Exception

Filter handshake related messages from reaching the messageSent callbacks of downstream filters.

Specified by:

messageSent in interface IoFilter

Overrides:

messageSent in class IoFilterAdapter

Parameters:

nextFilter - the next filter in filter chain

session - the session object

writeRequest - the data written

Throws:

Exception - If an error occurred while processing the event

sessionCreated

public void sessionCreated(IoFilter.NextFilter nextFilter,
                           IoSession session)
                    throws Exception

Called when the session is created. Will create the handler able to handle the ProxyIoSession.getRequest() request stored in the session. Event is stored in an IoSessionEventQueue for later delivery to the next filter in the chain when the handshake would have succeed. This will prevent the rest of the filter chain from being affected by this filter internals. Please note that this event can occur multiple times because of some http proxies not handling keep-alive connections thus needing multiple sessions during the handshake.

Specified by:

sessionCreated in interface IoFilter

Overrides:

sessionCreated in class IoFilterAdapter

Parameters:

nextFilter - the next filter in filter chain

session - the session object

Throws:

Exception - If an error occurred while processing the event

sessionOpened

public void sessionOpened(IoFilter.NextFilter nextFilter,
                          IoSession session)
                   throws Exception

Event is stored in an IoSessionEventQueue for later delivery to the next filter in the chain when the handshake would have succeed. This will prevent the rest of the filter chain from being affected by this filter internals.

Specified by:

sessionOpened in interface IoFilter

Overrides:

sessionOpened in class IoFilterAdapter

Parameters:

nextFilter - the next filter in filter chain

session - the session object

Throws:

Exception - If an error occurred while processing the event

sessionIdle

public void sessionIdle(IoFilter.NextFilter nextFilter,
                        IoSession session,
                        IdleStatus status)
                 throws Exception

Event is stored in an IoSessionEventQueue for later delivery to the next filter in the chain when the handshake would have succeed. This will prevent the rest of the filter chain from being affected by this filter internals.

Specified by:

sessionIdle in interface IoFilter

Overrides:

sessionIdle in class IoFilterAdapter

Parameters:

nextFilter - the next filter in filter chain

session - the session object

status - The IdleStatus type

Throws:

Exception - If an error occurred while processing the event

sessionClosed

public void sessionClosed(IoFilter.NextFilter nextFilter,
                          IoSession session)
                   throws Exception

Event is stored in an IoSessionEventQueue for later delivery to the next filter in the chain when the handshake would have succeed. This will prevent the rest of the filter chain from being affected by this filter internals.

Specified by:

sessionClosed in interface IoFilter

Overrides:

sessionClosed in class IoFilterAdapter

Parameters:

nextFilter - the next filter in filter chain

session - the session object

Throws:

Exception - If an error occurred while processing the event