Before I go an re-invent the wheel, I figured I'd ask here first.
Does anyone know of a PHP cache system[like APC and XCache] which has
the following features:
1) Saves the cached files to a tmpfs drive instead of using their own
shared memory pool?
2) Saves evals as well as files?
3) Keeps track of cached files[via inotify or some other means] and when
new copies are saved, updates the cache
4) For files that exist in the cache to begin with, when updating the
cache if the PHP file fails to compile[syntax errors, etc], keep using
the cached file and wait until a 'good' copy of the file is saved
5) Logging options so that alerts can be generated when a file has an error.
Basically, it strikes me that most of the popular systems are somewhat
based on being 'universal' and do not take advantage of current Linux
features which can save time. For example, by using a tmpfs drive all
the cached data can be "shared" between multiple systems by doing a
simple rsync between the systems. In fact, you can even rsync it over
to disk storage on one system for 'permanent' storage and then if you
reboot your PHP server, you can preload your cache by pulling data from
the central server. All using basic file system access.
With inotify, the cache server can keep an eye on the source of the
files and automatically update the cache.
If your planning your cache to contain most of your active PHP code to
begin with, there really is no reason to cache buggy code. If there is
a good copy in the cache, reject updates until they at least compile.
And of course, the cache server might as well log problems so you can
get them via email, instant message, sms, etc right away.
A sidebit is caching evals, since it does not seem that many systems do
this....which is understandable as it is beneficial to avoid evals to
begin with. However, CMS systems often use Evals to allow configuration
of code without needing to have files on the server. With all that
code stored in the database, it just makes sense to pre-compile and
cache it.
Since APC and XCache are open source, it is easy enough to pull the
logic for compiling/caching files when included from them...so really
it's just the other stuff that needs to be built.
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