I am going to be introducing multiple caches throughout sbt and I am
going to build these features out using this simple Repository
interface. The idea is that we access data by some key through the
Repository. This allows us to use the strategy pattern to easily switch
the runtime implementation of how to get the data.
I am going to add a classloader cache to improve the startup performance
of the run and test tasks. To prevent the classloader cache from having
unbounded size, I'm adding a simple LRUCache implementation to sbt. An
important characteristic of the implementation of the cache is that when
entries are evicted, we run a callback to cleanup the entry. This allows
us to automatically cleanup any resources created by the entry.
This is a pretty naive implementation that uses an array of entries that
it manipulates as elements are removed/accessed. In general, I expect
these caches to be quite small <= 4 elements, so the storage overhead /
performance of the simple implementation should be quite good. If
performance ever becomes an issue, we can specialzed LRUCache.apply to
use a different implementation for caches with large limits.
I noticed that debugging settings that return functions is annoying
because often the setting is initialized as an anonymous function with a
useless toString method. To improve the debugging for users, I'm adding
a number of wrapper classes for functions that override the default
toString with a provided label.
I then used these functions to label all of the anonymous functions in
Watched.scala.
The `sbt-server` was prepending a new probem and not appending.
The result was a `textDocument/publishDiagnostics` notification
containing a inverted list of problems compare to what was show in the
sbt console.
whitesourceOnPush calls whitesourceCheckPolicies and whitesourceUpdate on push.
Since Travis CI secrets are not available during PR from a fork, there's no point in calling these during the PR validation.
It was a mistake to disallow trailing semicolons for multi commands.
Firstly this was a mistake because previous versions of sbt supported a
trailing semi colon. It was also inconsistent with how commands work in
a regular shell (e.g. bash or zsh).