Created
December 4, 2019 09:53
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| class TableManager[F[_]](guard: Semaphore[F],)(implicit F: Sync[F], TableOps: TableOps[F]) { | |
| // this feels hacky | |
| private val state = mutable.Map.empty[String, Table] | |
| def tableFor(name: String, createIfMissing: Boolean): F[Table] = guard.withPermit { | |
| state.get(name) match { | |
| case Some(table) => table.pure[F] | |
| case None => for { | |
| newTable <- TableOps.open(buildPath(name), createIfMissing) | |
| _ <- F.delay(state += (name -> newTable)) | |
| } yield newTable | |
| } | |
| } | |
| def dropTable(name: String): F[Unit] = guard.withPermit { ... } | |
| } | |
| object TableManager { | |
| import cats.syntax.functor._ | |
| def apply[F[_] : Sync : TableOps]: F[TableManager[F]] = { | |
| Semaphore[F](1).flatMap(s => F.delay(new TableManager[F](s))) | |
| } | |
| } |
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