Added some concurency properties to prevent the build failing on a meager build server.

src/main/resources/default.properties

@@ -8,6 +8,10 @@ app.log.debug=false
 app.log.info=false
 app.log.error=true
 
+#Concurrency Settings
+app.engine.concurrent.similarity.limit=20
+app.engine.concurrent.processing.limit=10
+
 #Default Image Settings
 #images must be 90% similar
 image.differenceThreshold=0.90

src/main/scala/com/sothr/imagetools/ConcurrentEngine.scala

@@ -9,6 +9,7 @@ import akka.util.Timeout
 import java.util.concurrent.TimeUnit
 import scala.collection.mutable.{MutableList, HashSet}
 import com.sothr.imagetools.image.{SimilarImages, ImageFilter, Image}
+import com.sothr.imagetools.util.{PropertiesEnum, PropertiesService}
 import scala.concurrent.{Await, blocking, Future}
 import java.lang.Thread
 import scala.concurrent.ExecutionContext.Implicits.global
@@ -114,7 +115,7 @@ class ConcurrentEngine extends Engine with grizzled.slf4j.Logging {
 
 class ConcurrentEngineController extends Actor with ActorLogging {
     val imageCache = AppConfig.cacheManager.getCache("images")
-    val numOfRouters = 10
+    val numOfRouters = PropertiesService.get(PropertiesEnum.ConcurrentProcessingLimit.toString).toInt
     val router = context.actorOf(Props[ConcurrentEngineActor].withRouter(SmallestMailboxRouter(nrOfInstances = numOfRouters)))
     
     var images:MutableList[Image] = new MutableList[Image]()

src/main/scala/com/sothr/imagetools/util/PropertiesEnum.scala

@@ -8,6 +8,9 @@ object PropertiesEnum extends Enumeration {
   val LogInfo = Value("app.log.info")
   val LogError = Value("app.log.error")
   val Timed = Value("app.timed")
+  //default engine concurrency settings
+  val ConcurrentSimiliartyLimit = Value("app.engine.concurrent.similarity.limit")
+  val ConcurrentProcessingLimit = Value("app.engine.concurrent.processing.limit")
   //default image settings
   val ImageDifferenceThreshold = Value("image.differenceThreshold")
   val HashPrecision = Value("image.hash.precision")

src/test/resources/default.properties

@@ -8,6 +8,10 @@ app.log.debug=true
 app.log.info=true
 app.log.error=true
 
+#Concurrency Settings
+app.engine.concurrent.similarity.limit=2
+app.engine.concurrent.processing.limit=2
+
 #Default Image Settings
 #images must be 90% similar
 image.differenceThreshold=0.90