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Re: Question on JavaHL change

From: Blair Zajac <blair_at_orcaware.com>
Date: Thu, 22 May 2008 09:26:04 -0700

C. Michael Pilato wrote:
> Hyrum K. Wright wrote:
>>>> So a possible option c) would be to remove the timeMicros stuff
>>>> altogether and just go back to having a Date. We can wait for Blair
>>>> to comment. It seems to me that if the original goal was efficiency
>>>> we definitely no longer have that.
>>> No, the goal was to not have lossy dates. I believe if you get the
>>> date/timestamp from the 1.4 bindings for a revision and then lookup
>>> the revision with it, the revision will be - 1 less then the original
>>> revision, so its lossy.
>> Does the command line client have this same problem? It would seem
>> that all the date information is recoverable from svn:date. What part
>> is being lost?
> Yeah, I'm interested in this, too.
>>> I think the best solution is to put back explicit parameters for all
>>> our supported svn:* revprops and use the map for anything else. The
>>> C++ code can easily remove the svn:date, svn:log and svn:author from
>>> the map.
>> True, that it's easy for the C++ code to filter out svn:* revprops,
>> but I don't see why we should. Getting the property values from a Map
>> isn't difficult, and it's much more extensible than passing values
>> back directly. Also, I'd like to keep the JavaHL interface from
>> drifting to far away from the C interface.
> I don't use the Java bindings directly, but +1 on the sentiment of
> keeping them from drifting unnecessarily from the C interface. I don't
> see how returning svn:date's value asis would be "lossy". I mean, if it
> is, it would seem we certainly couldn't remedy that client-side. Why
> not just keep Hyrum's changes, but provide a handle utility function
> that converts Subversion dates into timeMicros?

Looking more closely at the code:

1) Only the java.util.Date is lossy, it only represents times to the
millisecond, so I put in the extra methods in LogMessage so you can get the time
in micros without doing any extra work.

2) The LogMessage class is already not similar to the C interface in that it
provides a strongly typed date as a java.util.Date. My work just extended it to
add a long microseconds values.

3) The current LogMessage class doesn't have the non-svn revision properties in
it, which I believe should be the real point of this work. Looking at the
current interface, it only exposes the svn primary properties through methods
(getAuthor, getMessage, etc), there's no way to get the map of other properties.

4) I don't see the point of moving the svn:date string to time parsing from the
C code to the Java code, it's probably slower.

So I think we can have the best of both worlds.

1) LogMessageCallback can have its String author, long timeMicros, String
message arguments returned and keep the of Map of revprops as an argument. Put
the time conversion back in the C code and remove the time parsing from the Java

2) LogMessage can grow a Map<String,String> field and a getRevisionProperties()
method for getting all revision properties.

We can either remove svn:date, svn:author and svn:log from the revprops map or
keep them in. This is a style issue. Maybe keeping them all in is better?
This seems more consistent with the meaning of the map??? And the meaning of
the C code where the map has all properties.

So we can take Mark's patch and revert parts of the C++ code in r31273 to get
the desired code.


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Received on 2008-05-22 18:26:27 CEST

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