object ClasspathHasher
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- def containsMacroDefinition(classpath: Seq[File]): Task[Seq[(File, Boolean)]]
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- def hash(classpath: Array[AbsolutePath], parallelUnits: Int, cancelCompilation: Promise[Unit], scheduler: Scheduler, logger: Logger, tracer: BraveTracer, serverOut: PrintStream): Task[Either[Unit, Vector[FileHash]]]
Hash the classpath in parallel with Monix's task.
Hash the classpath in parallel with Monix's task.
The hashing works in two steps: first, we try to acquire the hash of a given entry. This "negotiation" step is required because we may be hashing other project's classpath concurrently and we want to minimize stalling and make as much progress as we can hashing. Those entries whose hashing couldn't be "acquired" are left to the second step, which blocks until the ongoing hashing finishes.
This approach allows us to control how many concurrent tasks we spawn to new threads (and, therefore, how many threads we create in the io pool) and, at the same time, allows us to do as much progress without blocking.
NOTE: When the task returned by this method is cancelled, the promise
cancelCompilationwill be completed and the returned value will be empty. The call-site needs to handle the case where cancellation happens.- classpath
The list of files to be hashed (if they exist).
- parallelUnits
The amount of classpath entries we can hash at once.
- cancelCompilation
A promise that will be completed if task is cancelled.
- scheduler
The scheduler that should be used for internal Monix usage.
- logger
The logger where every action will be logged.
- tracer
A tracer to keep track of timings in Zipkin.
- returns
A task returning an error if the task was cancelled or a complete list of hashes.
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