From bee13ba7a4458482ce00a5c6bae4cd64328c4e5e Mon Sep 17 00:00:00 2001
From: Christopher Vogt <oss.nsp@cvogt.org>
Date: Thu, 9 Feb 2017 02:29:44 +0000
Subject: memoize task results across classes within a single run

---
 stage2/BasicBuild.scala | 29 +++++------------------------
 1 file changed, 5 insertions(+), 24 deletions(-)

(limited to 'stage2/BasicBuild.scala')

diff --git a/stage2/BasicBuild.scala b/stage2/BasicBuild.scala
index 8b4a3a5..2fd34c7 100644
--- a/stage2/BasicBuild.scala
+++ b/stage2/BasicBuild.scala
@@ -9,6 +9,8 @@ trait BaseBuild extends BuildInterface with DependencyImplementation with Trigge
   // will create new instances given the context, which means operations in the
   // overrides will happen multiple times and if they are not idempotent stuff likely breaks
   def context: Context
+  def moduleKey: String = "BaseBuild("+projectDirectory.string+")"
+  implicit def transientCache: java.util.Map[AnyRef,AnyRef] = context.transientCache
 
   // library available to builds
   implicit protected final val logger: Logger = context.logger
@@ -59,7 +61,7 @@ trait BaseBuild extends BuildInterface with DependencyImplementation with Trigge
     // FIXME: this should probably be removed
     Resolver( mavenCentral ).bind(
       "org.scala-lang" % "scala-library" % scalaVersion
-    ) :+ BinaryDependency(localJars, Nil)
+    ) ++ ( if(localJars.nonEmpty) Seq( BinaryDependency(localJars, Nil) ) else Nil )
 
   // ========== paths ==========
   final private val defaultSourceDirectory = projectDirectory ++ "/src"
@@ -135,15 +137,13 @@ trait BaseBuild extends BuildInterface with DependencyImplementation with Trigge
     "-unchecked"
   )
 
-  private object needsUpdateCache extends Cache[Boolean]
-  def needsUpdate: Boolean = needsUpdateCache(
+  def needsUpdate: Boolean = taskCache[BaseBuild]("needsUpdate").memoize[java.lang.Boolean](
     context.cbtHasChanged
     || lib.needsUpdate( sourceFiles, compileStatusFile )
     || transitiveDependencies.filterNot(_ == context.parentBuild).exists(_.needsUpdate)
   )
 
-  private object compileCache extends Cache[Option[File]]
-  def compile: Option[File] = compileCache{
+  def compile: Option[File] = taskCache[BaseBuild]("compile").memoize{
     lib.compile(
       context.cbtHasChanged,
       needsUpdate || context.parentBuild.map(_.needsUpdate).getOrElse(false),
@@ -153,7 +153,6 @@ trait BaseBuild extends BuildInterface with DependencyImplementation with Trigge
     )
   }
 
-  
   def mainClasses: Seq[Class[_]] = compile.toSeq.flatMap( lib.mainClasses( _, classLoader(classLoaderCache) ) )
 
   def runClass: Option[String] = lib.runClass( mainClasses ).map( _.getName )
@@ -264,24 +263,6 @@ trait BaseBuild extends BuildInterface with DependencyImplementation with Trigge
   def finalBuild: BuildInterface = this
   override def show = this.getClass.getSimpleName ++ "(" ++ projectDirectory.string ++ ")"
 
-  // TODO: allow people not provide the method name, maybe via macro
-  // TODO: pull this out into lib
-  /**
-  caches given value in context keyed with given key and projectDirectory
-  the context is fresh on every complete run of cbt
-  */
-  def cached[T <: AnyRef](name: String)(task: => T): T = {
-    val cache = context.transientCache
-    val key = (projectDirectory,name)
-    if( cache.containsKey(key) ){
-      cache.get(key).asInstanceOf[T]
-    } else{
-      val value = task
-      cache.put( key, value )
-      value
-    }
-  }
-
   // a method that can be called only to trigger any side-effects
   final def `void` = ()
 }
-- 
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