This is increasingly difficult to maintain, and has very limited
benefit. Modern coprocessors with enough horsepower to run Java
applications can use the Gradle or Bazel build systems instead.
Adds a section on design philosophy so we have something to point to
when people suggest features that aren't compatible with the way WPILib
is designed. Fixes some missed reorg changes (although the native-utils
link intentionally points to main as to be up-to-date in the future) and
generally cleans up any outdated information. Also includes wording
about supporting FTC. Per discussion in Slack, the LabVIEW wording has
been removed, and anything to do with LabVIEW is going to have to be
NI's job. And pursuant to #2757 and #5331, additional (light) developer
documentation has been added to some subprojects, mostly being a quick
summary of the what the project does and what it's for (or not for).
---------
Co-authored-by: sciencewhiz <sciencewhiz@users.noreply.github.com>
Co-authored-by: Joseph Eng <91924258+KangarooKoala@users.noreply.github.com>
Commands v3 had a few changes due to the upgrade:
- Java 24 removed the Pinned: MONITOR IllegalStateException when
yielding in a synchronized block, so we no longer need to special case
for it
- Lambda method name generation was tweaked, requiring tests to be
updated
- Bazel java_rules needed to be bumped to support Java 25
Closes#8425
The framework fundamentally relies on the continuation API added in Java 21 (which is currently internal to the JDK). Continuations allow for call stacks to be saved to the heap and resumed later.
The async framework allows command bodies to be written in an imperative style. However, an async command will need to be actively cooperative and periodically call coroutine.yield() in loops to yield control back to the command scheduler to let it process other commands.
There are also some other additions like priority levels (as opposed to a blanket yes/no for ignoring incoming commands), factories requiring names be provided for commands, and the scheduler tracking all running commands and not just the highest-level groups. However, those changes aren't unique to an async framework, and could just as easily be used in a traditional command framework.
libprotobuf is a very annoying dependency to deal with, and with the switch to nanopb for generated C++ code, libprotobuf is only used for dynamic decode in the GUI apps. libprotobuf has been swapped out with upb, a much smaller C-based library that supports reflection and can therefore do dynamic decode. This means we can remove the libprotobuf dependency and stop dealing with build issues because of it.
