Merge pull request #7 from ryan-williams/rel

make ContigNames map concurrent

build.sbt

@@ -1,6 +1,6 @@
 organization := "org.hammerlab.genomics"
 name := "reference"
-version := "1.2.0"
+version := "1.2.1"
 
 // This branch only builds against Scala 2.11.x.
 

project/plugins.sbt

@@ -1 +1,2 @@
-addSbtPlugin("org.hammerlab" % "sbt-parent" % "1.6.1")
+resolvers ++= Seq(Resolver.sonatypeRepo("releases"), Resolver.sonatypeRepo("snapshots"))
+addSbtPlugin("org.hammerlab" % "sbt-parent" % "1.6.3")

src/main/scala/org/hammerlab/genomics/reference/ContigName.scala

@@ -1,6 +1,6 @@
 package org.hammerlab.genomics.reference
 
-import scala.collection.mutable
+import scala.collection.concurrent
 
 /**
  * Implicit-value-class wrapper for strings representing names of contigs.
@@ -49,7 +49,8 @@ class ContigName private(val name: String)
  */
 object ContigName {
 
-  private[reference] val names = mutable.Map[String, ContigName]()
+  // Can be accessed by multiple threads at once.
+  private[reference] val names = concurrent.TrieMap[String, ContigName]()
 
   // Map from string contig name to ordered rank.
   private[reference] val map: Map[String, Int] =