When split from service/storage_service.hh (4ca2ae13) it accidentally
changed license. Change it back (since it does not contain
Apache derived code, constrain it to AGPL-3.0-or-later).
Closes#10572
Instead of lengthy blurbs, switch to single-line, machine-readable
standardized (https://spdx.dev) license identifiers. The Linux kernel
switched long ago, so there is strong precedent.
Three cases are handled: AGPL-only, Apache-only, and dual licensed.
For the latter case, I chose (AGPL-3.0-or-later and Apache-2.0),
reasoning that our changes are extensive enough to apply our license.
The changes we applied mechanically with a script, except to
licenses/README.md.
Closes#9937
The storage service carries sempaphore and a size_t value
to facilitate the memory limiting for client services.
This patch encapsulates both fields on a separate helper
class that will be used by whoever needs it without
messing with the storage service.
Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>
