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package sbt
package compiler
import xsbti.{Logger => xLogger, Reporter}
import xsbti.compile.{CachedCompiler, CachedCompilerProvider, GlobalsCache, Output}
import Logger.f0
import java.io.File
import java.util.{LinkedHashMap,Map}
private final class CompilerCache(val maxInstances: Int) extends GlobalsCache
{
private[this] val cache = lru[CompilerKey, CachedCompiler](maxInstances)
private[this] def lru[A,B](max: Int) = new LinkedHashMap[A,B](8, 0.75f, true) {
override def removeEldestEntry(eldest: Map.Entry[A,B]): Boolean = size > max
}
def apply(args: Array[String], output: Output, forceNew: Boolean, c: CachedCompilerProvider, log: xLogger, reporter: Reporter): CachedCompiler = synchronized
{
val key = CompilerKey(dropSources(args.toList), c.scalaInstance.actualVersion)
if(forceNew) cache.remove(key)
cache.get(key) match {
case null =>
log.debug(f0("Compiler cache miss. " + key.toString))
put(key, c.newCachedCompiler(args, output, log, reporter, /* resident = */ !forceNew))
case cc =>
log.debug(f0("Compiler cache hit (" + cc.hashCode.toHexString + "). " + key.toString))
cc
}
}
def clear(): Unit = synchronized { cache.clear() }
private[this] def dropSources(args: Seq[String]): Seq[String] =
args.filterNot(arg => arg.endsWith(".scala") || arg.endsWith(".java"))
private[this] def put(key: CompilerKey, cc: CachedCompiler): CachedCompiler =
{
cache.put(key, cc)
cc
}
private[this] final case class CompilerKey(args: Seq[String], scalaVersion: String) {
override def toString = "scala " + scalaVersion + ", args: " + args.mkString(" ")
}
}
object CompilerCache
{
def apply(maxInstances: Int): GlobalsCache = new CompilerCache(maxInstances)
val fresh: GlobalsCache = new GlobalsCache {
def clear() {}
def apply(args: Array[String], output: Output, forceNew: Boolean, c: CachedCompilerProvider, log: xLogger, reporter: Reporter): CachedCompiler =
c.newCachedCompiler(args, output, log, reporter, /*resident = */ false)
}
}
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