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From "dave irving (JIRA)" <>
Subject [jira] Commented: (DIRMINA-121) Per-port filter chain
Date Wed, 16 Nov 2005 09:21:29 GMT
    [ ] 

dave irving commented on DIRMINA-121:

Would it be possible to have some clarifications on the scope of this change?
We have discussed a basic implementation which would allow builder style configuration of
per sessionManager / port / session chains without filter copying - which is simple enough
to implement.

However, this is restrictive for some users who need control on a per session basis over the
whole chain.
As an example:
Suppose during a conversation with a client they request a certain transport encryption mode
should be employed. This may result in the handler wanting to configure a filter supporting
such encryption at the start of the entire (connection) chain.

The proposed solution would only allow handlers to modify the per session chain - as the other
chains are shared by all other connections.

One option is to extend the proposed solution, as follows:

- In addition to a user being able to do session.getIoFilterChain() (which returns the session
chain) they can also do session.getIoFilterChainBefore("chainName")
- I.e, IoFilterChain prePortChain = session.getIoFilterChainBefore("portChain");
- This provides a per session encapsulated chain which is inserted before the named chain.
- The implementation is almost the same as the initial solution 

This solves the use case described above. However, it may still be too restrictive for some
users who want full control over the whole logical chain for a connection.

Unfortunately, I dont see a way to provide full control without breaking the current semantics
of IoFilter due to the way each filter knows its location (we'd either have to make it possible
to "copy" filters, or we'd have to change the way a filter knows its location).
So as it stands I cant really propose a patch which provides "full control" over the logical
connection chain.

Would it be possible to clarify whether the proposed solution is acceptable - or whether we
should go further to enable full control as has been requested?

I want to make sure I provide a beneficial solution :o)

Many thanks,


> Per-port filter chain
> ---------------------
>          Key: DIRMINA-121
>          URL:
>      Project: Directory MINA
>         Type: Improvement
>     Versions: 0.8
>     Reporter: Trustin Lee
>     Assignee: Trustin Lee
>      Fix For: 0.9

> MINA 0.8 provides only per-sessionmanager filter chain which is usually not so useful.
 So we need to replace it with per-port filter chain like this:
> * IoFilterChain IoSessionManager.getFilterChain(SocketAddress address);
> This method will behave a little bit differently depending on it is an acceptor or a
connector.  For an acceptor, address will be a bind address.  Otherwise, it will be a remote
address.  I think this is reasonable enough and it will be fine if we document this explicitly.

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