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From Filip Hanik - Dev Lists <devli...@hanik.com>
Subject 6.x feature wishlist
Date Tue, 07 Aug 2007 04:36:24 GMT
I wanted to start a wish list of what we can move forward with, here is 
a short list of items that I had in mind as a starter

1. Session replication - stateless backup location
   Store the backup location of a session as part of the sessionId, 
similar to the jvmRoute but opposite.
   This way, you can scale a cluster horizontally, since the location of 
the backup node doesn't have to be known until you fail over.

2. Add a block/no-block parameter to InputFilter.doRead and 
OutputFilter.doWrite
    InputFilter -> public int doRead(ByteChunk chunk, Request unused, 
boolean block) throws IOException;
    OutputFilter -> public int doWrite(ByteChunk chunk, Response unused, 
boolean block) throws IOException;
    Servlet 3.0 will most likely expose non blocking read/write through 
the servlet API, this will get us there ahead of time
    Haven't thought of how we expose this API yet though, but more will 
follow

3. Consolidate connector code
   Currently we have 
Http11Processor/Http11NioProcessor/Http11AprProcessor doing almost the 
same thing, there is much that
   can be consolidated to make the code more maintainable
   Essentially, you create a Endpoint base line interface.
   At the same time we could consolidate the Internal(In/Out)put buffers 
as they are copies too.
   We have some fairly tuned endpoints now, it would also be nice to 
make these protocol agnostic.

4. Startup -> server.xml warnings
   If one enters an invalid element or attribute that is simply ignored 
today, at least output an info or warn message letting the
   admin know if its misconfiguration.

5. Finish bayeux -> I started this in sandbox, took me a while to 
understand the protocol, and its not as cool as I thought it would be
   but I still feel its important for it to be part of Tomcat

6. Auto context logging
   Automatically create loggers for each context, so that one doesn't 
have to specify one per context in logging.properties
   Of course, you can turn on/off the auto context logger through 
logging.properties

7. File cache - use MappedByteBuffers for the file cache, that way the 
send file operation can benefit even more
   when you have two direct buffers, and you also avoid reading the disk 
each time for a file
   ideas on this came from Jeanfrancois Arcand.
   
(http://fisheye5.cenqua.com/browse/glassfish/appserv-http-engine/src/java/com/sun/enterprise/web/connector/grizzly/FileCache.java?r=1.21)

8. Add getName()/setName() to the WebappClassLoader, name of the web app 
classloader will correspond to the one of the Context container
   Applications like Terracotta or AOP apps can much easier plug in and 
be able to share data when they know what loader the class came from

9. Add the configuration option to start the connectors after all apps 
are deployed
   If some applications are taking long to startup, load balancers are 
already trying to send requests to the Tomcat instance, which is just 
bound to a port, but not yet taking requests

10.Turn our embedded thread pools into Tomcat Executor thread pools, 
same performance but pluggable. Instead of having them hidden in the end 
point code

11.Timestamps & System.currentTimeMillis
   System.currentTimeMillis is invoked everywhere during the chain of 
events for a HTTP requests, even though most dates only need precision 
down to the second.
   I've received feedback that this could be improved by keeping a time 
service, that updates a timestamp every second, and therefor reduces the 
number of system calls
   I think we would need to prove the theory before committing to the 
implementation, but that should be pretty easy

12.Comet sample webapp
   While most folks want to start with Comet, it is a strange question, 
tons of users on the user list just are having a hard time getting kick 
started

I was thinking we can keep this list on Wiki or in a text file in SVN,
http://wiki.apache.org/tomcat/6xFeatures


thoughts
Filip





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