diff --git a/dataforge-core/src/main/kotlin/hep/dataforge/cache/CachePlugin.kt b/dataforge-core/src/main/kotlin/hep/dataforge/cache/CachePlugin.kt
index afd7d1a..6ba8792 100644
--- a/dataforge-core/src/main/kotlin/hep/dataforge/cache/CachePlugin.kt
+++ b/dataforge-core/src/main/kotlin/hep/dataforge/cache/CachePlugin.kt
@@ -87,27 +87,25 @@ class CachePlugin(meta: Meta) : BasicPlugin(meta) {
                     }
                 }
 
+                @Synchronized
                 override fun run() {
-                    //TODO add executor
-                    synchronized(cache) {
-                        when {
-                            data.goal.isDone -> data.future.thenAccept { result.complete(it) }
-                            cache.containsKey(id) -> {
-                                logger.info("Cached result found. Restoring data from cache for id {}", id.hashCode())
-                                CompletableFuture.supplyAsync { cache.get(id) }.whenComplete { res, err ->
-                                    if (res != null) {
-                                        result.complete(res)
-                                    } else {
-                                        evalData()
-                                    }
+                    when {
+                        data.goal.isDone -> data.future.thenAccept { result.complete(it) }
+                        cache.containsKey(id) -> {
+                            logger.info("Cached result found. Restoring data from cache for id {}", id.hashCode())
+                            CompletableFuture.supplyAsync { cache.get(id) }.whenComplete { res, err ->
+                                if (res != null) {
+                                    result.complete(res)
+                                } else {
+                                    evalData()
+                                }
 
-                                    if (err != null) {
-                                        logger.error("Failed to load data from cache", err)
-                                    }
+                                if (err != null) {
+                                    logger.error("Failed to load data from cache", err)
                                 }
                             }
-                            else -> evalData()
                         }
+                        else -> evalData()
                     }
                 }
 
@@ -162,7 +160,7 @@ class CachePlugin(meta: Meta) : BasicPlugin(meta) {
     }
 
     fun <V : Any> cacheNode(cacheName: String, node: DataNode<V>, idFactory: (NamedData<*>) -> Meta): DataNode<V> {
-        val builder = DataTree.edit(node.type).also {cached->
+        val builder = DataTree.edit(node.type).also { cached ->
             cached.name = node.name
             cached.meta = node.meta
             //recursively caching everything
@@ -176,7 +174,7 @@ class CachePlugin(meta: Meta) : BasicPlugin(meta) {
 
     private fun <V> getCache(name: String, type: Class<V>): Cache<Meta, V> {
         return manager.getCache(name, Meta::class.java, type)
-                ?: manager.createCache(name, MetaCacheConfiguration(meta, type))
+            ?: manager.createCache(name, MetaCacheConfiguration(meta, type))
     }
 
     //    @Override
diff --git a/dataforge-core/src/main/kotlin/hep/dataforge/data/DataNode.kt b/dataforge-core/src/main/kotlin/hep/dataforge/data/DataNode.kt
index f44cafd..bb1e699 100644
--- a/dataforge-core/src/main/kotlin/hep/dataforge/data/DataNode.kt
+++ b/dataforge-core/src/main/kotlin/hep/dataforge/data/DataNode.kt
@@ -175,9 +175,7 @@ interface DataNode<T : Any> : Iterable<NamedData<out T>>, Named, Metoid, Provide
      *
      * @return
      */
-    fun nodeGoal(): GoalGroup {
-        return GoalGroup(this.dataStream().map { it.goal }.toList())
-    }
+    fun nodeGoal(): GoalGroup = GoalGroup(dataStream().map { it.goal }.toList())
 
     /**
      * Handle result when the node is evaluated. Does not trigger node evaluation. Ignores exceptional completion
diff --git a/dataforge-core/src/main/kotlin/hep/dataforge/workspace/AbstractWorkspace.kt b/dataforge-core/src/main/kotlin/hep/dataforge/workspace/AbstractWorkspace.kt
index a91fde8..e770a71 100644
--- a/dataforge-core/src/main/kotlin/hep/dataforge/workspace/AbstractWorkspace.kt
+++ b/dataforge-core/src/main/kotlin/hep/dataforge/workspace/AbstractWorkspace.kt
@@ -71,9 +71,8 @@ abstract class AbstractWorkspace(
     /**
      * Put given data node into cache one by one
      */
-    private fun <R : Any> cacheTaskResult(model: TaskModel, node: DataNode<out R>): DataNode<out R> {
-        return cache.cacheNode(model.name, node) { model.getID(it) }
-    }
+    private fun <R : Any> cacheTaskResult(model: TaskModel, node: DataNode<out R>): DataNode<out R> =
+        cache.cacheNode(model.name, node) { model.getID(it) }
 
     override fun clean() {
         logger.info("Cleaning up cache...")
diff --git a/dataforge-core/src/test/kotlin/hep/dataforge/workspace/WorkspaceTest.kt b/dataforge-core/src/test/kotlin/hep/dataforge/workspace/WorkspaceTest.kt
index a05898d..210d953 100644
--- a/dataforge-core/src/test/kotlin/hep/dataforge/workspace/WorkspaceTest.kt
+++ b/dataforge-core/src/test/kotlin/hep/dataforge/workspace/WorkspaceTest.kt
@@ -24,6 +24,7 @@ import hep.dataforge.meta.MetaBuilder
 import hep.dataforge.workspace.tasks.PipeTask
 import hep.dataforge.workspace.tasks.TaskModel
 import org.junit.Assert.assertEquals
+import org.junit.Before
 import org.junit.BeforeClass
 import org.junit.Test
 import org.slf4j.LoggerFactory
@@ -49,17 +50,23 @@ class WorkspaceTest {
         val res2 = wsp.runTask("test2", Meta.empty())
         res1.computeAll()
         res2.computeAll()
-        assertEquals(6, counter.get().toLong())
+        assertEquals(6, counter.get())
         val res3 = wsp.runTask("test2", MetaBuilder().putValue("a", 1))
             .getCheckedData("data_2", Number::class.java).get().toLong()
         assertEquals(6, res3)
-        assertEquals(8, counter.get().toLong())
+        assertEquals(8, counter.get())
     }
 
     companion object {
         private val counter = AtomicInteger()
         private lateinit var wsp: Workspace
 
+        @Before
+        fun beforeEach(){
+            counter.set(0)
+        }
+
+
         @BeforeClass
         @JvmStatic
         fun setup() {
@@ -67,19 +74,13 @@ class WorkspaceTest {
                 load(CachePlugin::class.java, MetaBuilder().setValue("fileCache.enabled", false))
             }
 
-
             val task1 = object : PipeTask<Number, Number>("test1", Number::class.java, Number::class.java) {
                 override fun buildModel(model: TaskModel.Builder, meta: Meta) {
                     model.data("*")
                 }
 
                 override fun result(context: Context, name: String, input: Number, meta: Meta): Number {
-                    try {
-                        Thread.sleep(200)
-                    } catch (e: InterruptedException) {
-                        throw RuntimeException(e)
-                    }
-
+                    Thread.sleep(200)
                     counter.incrementAndGet()
                     return input.toInt() + meta.getInt("a", 2)
                 }
@@ -91,12 +92,7 @@ class WorkspaceTest {
                 }
 
                 override fun result(context: Context, name: String, input: Number, meta: Meta): Number {
-                    try {
-                        Thread.sleep(200)
-                    } catch (e: InterruptedException) {
-                        throw RuntimeException(e)
-                    }
-
+                    Thread.sleep(200)
                     counter.incrementAndGet()
                     return input.toInt() * meta.getInt("b", 2)
                 }