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From Aaron Smuts <aasm...@wisc.edu>
Subject RE: cvs commit: jakarta-turbine-jcs/src/experimental/org/apache/jcs/engine/memory/lru LHMLRUMemoryCache.java
Date Thu, 15 Apr 2004 22:00:18 GMT
You can test for the 1.4 class by name, but to use it you have to extend
it.  So, it could be built and run on an earlier jdk, but you'd need 1.4
to build the project. . . .

Aaron


> -----Original Message-----
> From: Daniel Rall [mailto:dlr@collab.net]
> Sent: Thursday, April 15, 2004 3:37 PM
> To: Turbine JCS Developers List
> Subject: Re: cvs commit: jakarta-turbine-
> jcs/src/experimental/org/apache/jcs/engine/memory/lru
> LHMLRUMemoryCache.java
> 
> Aaron Smuts wrote:
> > I have it in the experimental for now since it requires jdk1.4.
> >
> > I'm not sure what the standard jdk for projects is.
> 
> Aaron, the ASF doesn't have a "standard" JDK per say.  It's up to each
> individual project to define that for itself.  Most projects support
the
> earliest version of JDK reasonable for the functionality they provide,
go
> with a
> runtime dependency upon JRE 1.2 (I think that Ant is the only one
still
> supporting JRE 1.1), with a variable compile-time dependency on JDK
> version.
> For instance, some classes in a project may require JDK 1.4 at
compile-
> time, but
> examine what's available at runtime and fall back to an alternate
> implementation
> (e.g. JDK LinkedHashMap vs. Jakarta Commons SequencedHashMap).
> 
> I recommend against a hard runtime dependency upon JRE 1.4, for as
much as
> we'd
> like to believe otherwise, there is a lot of production code out there
> which is
> written for and/or tested against older JREs which are unlikely to be
> upgraded
> any time soon.  1.2 is preferable, or 1.3 if it's too much trouble to
> swing that.
> 
> > Travis has a way to either use this if you are running 1.4 or to
fall
> > back to a commons package.  I need to make sure that fallback is ok
or
> > find another.
> 
> Yup, +1.
> 
> > I need more tests on how this LinkedHashMap performs.  Travis is
right
> > that it makes the coed much cleaner, or at least there is less of us
> > this way.
> >
> > One very small problem is that there is no way to do a quiet get
with
> > the LinkedHashMap.
> ...
> 
> - Dan
> 
> 
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