Provides an interface for classes to implement their own flush()
functionality. This function gets called early in a request on
all implementations of Flushable when flush=1|all is requested in the
URL.
This fix came out of an issue where Requirements combined files were not
being cleaned up after dev/build?flush=1, due to the fact that flush
would only occur when you called it while on a page that used those
combined files, but not in any other contexts. This will now call flush
on any implementors of Flushable regardless of the context of where
flush was called.
Otherwise conditional logic will only succeed
when run through "sake dev/tests", not when
run through phpunit directly (which is the recommended way now)
This is now the default setting for both "sake" and "phpunit"
runs, because of performance reasons (every manifest flush takes
multiple seconds). On the other hand, we want to make errors
like missing classes more obvious to developers.
See discussion in https://github.com/silverstripe/sapphire/pull/620
Leave the decision to the phpunit.xml config (via <get> setting),
or to the individual run via "phpunit <folder> '' flush=1".
Flushing takes multiple seconds even on my fast SSD,
which greatly reduces the likelyhood of developers adopting TDD.
Necessary to have the <get name="db" /> directive
working in phpunit.xml definitions, which in turns allows
us to use GET parameters to switch the database connection
for running automated tests.
