diff --git a/reactor/Core/src/jetbrains/mps/logic/reactor/core/internal/ConstraintsProcessing.kt b/reactor/Core/src/jetbrains/mps/logic/reactor/core/internal/ConstraintsProcessing.kt
index f70a99d2..0dc47ed2 100644
--- a/reactor/Core/src/jetbrains/mps/logic/reactor/core/internal/ConstraintsProcessing.kt
+++ b/reactor/Core/src/jetbrains/mps/logic/reactor/core/internal/ConstraintsProcessing.kt
@@ -42,11 +42,10 @@ internal class ConstraintsProcessing(
     val logicalState: LogicalState,
     override val ispec: IncrementalSpec = IncrementalSpec.DefaultSpec,
     val trace: EvaluationTrace = EvaluationTrace.NULL,
-    val profiler: Profiler? = null
-
-    // fixme: can get rid of inheritance from journal, use composition instead
-) : StoreAwareJournalImpl(journal, logicalState), IncrSpecHolder {
-
+    val profiler: Profiler? = null ) :  MatchJournal by journal,
+                                        LogicalStateObservable by LogicalState(),
+                                        IncrSpecHolder
+{
     fun getFrontState(): DispatchingFrontState = dispatchingFront.state()
 
     fun engage(controller: Controller) {
diff --git a/reactor/Core/src/jetbrains/mps/logic/reactor/core/internal/MatchJournal.kt b/reactor/Core/src/jetbrains/mps/logic/reactor/core/internal/MatchJournal.kt
index bd73a054..bfc93baa 100644
--- a/reactor/Core/src/jetbrains/mps/logic/reactor/core/internal/MatchJournal.kt
+++ b/reactor/Core/src/jetbrains/mps/logic/reactor/core/internal/MatchJournal.kt
@@ -28,6 +28,14 @@ typealias ChunkIndex = TIntObjectHashMap<MatchJournal.Chunk>
 
 interface MatchJournal :  EvidenceSource {
 
+    // for tests
+    companion object {
+        fun fromView(
+            ispec: IncrementalSpec = IncrementalSpec.DefaultSpec,
+            view: MatchJournal.View? = null
+        ): MatchJournal = MatchJournalImpl(ispec, EvaluationTrace.NULL, view)
+    }
+
     /**
      * Add new [Chunk] for matches of principal rules.
      * Log occurrences discarded by match in current [Chunk].
diff --git a/reactor/Core/src/jetbrains/mps/logic/reactor/core/internal/MatchJournalImpl.kt b/reactor/Core/src/jetbrains/mps/logic/reactor/core/internal/MatchJournalImpl.kt
index bd943fbe..b13266c2 100644
--- a/reactor/Core/src/jetbrains/mps/logic/reactor/core/internal/MatchJournalImpl.kt
+++ b/reactor/Core/src/jetbrains/mps/logic/reactor/core/internal/MatchJournalImpl.kt
@@ -19,6 +19,7 @@ package jetbrains.mps.logic.reactor.core.internal
 import jetbrains.mps.logic.reactor.core.*
 import jetbrains.mps.logic.reactor.core.internal.MatchJournal.*
 import jetbrains.mps.logic.reactor.evaluation.ConstraintOccurrence
+import jetbrains.mps.logic.reactor.evaluation.EvaluationTrace
 import jetbrains.mps.logic.reactor.evaluation.RuleMatch
 import jetbrains.mps.logic.reactor.evaluation.StoreView
 import jetbrains.mps.logic.reactor.logical.Logical
@@ -31,6 +32,7 @@ import java.util.*
 
 internal open class MatchJournalImpl(
     override val ispec: IncrementalSpec,
+    val trace: EvaluationTrace = EvaluationTrace.NULL,
     view: MatchJournal.View? = null
 ) : MatchJournal, IncrSpecHolder {
 
@@ -98,7 +100,8 @@ internal open class MatchJournalImpl(
         assert(initialChunk.match is InitRuleMatch)
     }
 
-    constructor(view: MatchJournal.View? = null) : this(IncrementalSpec.DefaultSpec, view)
+    constructor(trace: EvaluationTrace = EvaluationTrace.NULL,
+                view: MatchJournal.View? = null) : this(IncrementalSpec.DefaultSpec, trace, view)
 
     override fun logMatch(match: RuleMatch): MatchChunk? {
         val added: MatchChunk?
diff --git a/reactor/Core/src/jetbrains/mps/logic/reactor/core/internal/StoreAwareJournal.kt b/reactor/Core/src/jetbrains/mps/logic/reactor/core/internal/StoreAwareJournal.kt
deleted file mode 100644
index 0f06d877..00000000
--- a/reactor/Core/src/jetbrains/mps/logic/reactor/core/internal/StoreAwareJournal.kt
+++ /dev/null
@@ -1,61 +0,0 @@
-/*
- * Copyright 2014-2019 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package jetbrains.mps.logic.reactor.core.internal
-
-import jetbrains.mps.logic.reactor.core.LogicalStateObservable
-import jetbrains.mps.logic.reactor.program.IncrementalSpec
-import java.lang.IllegalArgumentException
-
-
-/**
- * [MatchJournal] which also maintains observers in [LogicalStateObservable] in sync with its current position.
- */
-interface StoreAwareJournal : MatchJournal, LogicalStateObservable {
-
-    // for tests
-    companion object {
-        fun fromView(
-            ispec: IncrementalSpec = IncrementalSpec.DefaultSpec,
-            view: MatchJournal.View? = null
-        ): StoreAwareJournal = StoreAwareJournalImpl(MatchJournalImpl(ispec, view))
-    }
-}
-
-
-internal open class StoreAwareJournalImpl(private val journal: MatchJournal,
-                                          private val logicalState: LogicalState = LogicalState())
-    : MatchJournal by journal, StoreAwareJournal, LogicalStateObservable by logicalState
-{
-
-    private class FramePos(
-        chunk: MatchJournal.Chunk,
-        entriesCount: Int = 0
-    ) : MatchJournal.Pos(chunk, entriesCount)
-
-    override fun currentPos(): MatchJournal.Pos =
-        FramePos(journal.currentPos().chunk, journal.currentPos().entriesCount)
-
-    // Throw away recently added chunks and reset store accordingly
-    // NB: not checking that chunks are actually recently added, from this exec session
-    override fun reset(pastPos: MatchJournal.Pos) {
-        if (pastPos is FramePos) {
-            journal.reset(pastPos)
-        } else {
-            throw IllegalArgumentException()
-        }
-    }
-}
\ No newline at end of file
diff --git a/reactor/Test/test/TestStoreAwareJournal.kt b/reactor/Test/test/TestStoreAwareJournal.kt
index 114b2470..d9f33997 100644
--- a/reactor/Test/test/TestStoreAwareJournal.kt
+++ b/reactor/Test/test/TestStoreAwareJournal.kt
@@ -36,7 +36,7 @@ class TestStoreAwareJournal {
     private class JournalDispatcherHelper(
         dispatcher: Dispatcher,
         ispec: IncrementalSpec = LegacyMockIncrProgSpec,
-        val hist: StoreAwareJournal = StoreAwareJournal.fromView(ispec)
+        val hist: MatchJournal = MatchJournal.fromView(ispec)
     ) {
         val initialJournalSize = hist.view().chunks.size