Move ordering logic out of AbstractSubtreeManagerRegistryBuilderBuilder

Introduces YangDAG that maintains topological order for yang schema
nodes and can be used by other components to read additional graph edges,
e.g. from file (HONEYCOMB-365).

Change-Id: Ia3046d38ffb4ca222412309f6c4391afc9315bd2
Signed-off-by: Marek Gradzki <mgradzki@cisco.com>

14 files changed, 226 insertions, 125 deletions

diff --git a/infra/it/it-test/src/test/java/io/fd/honeycomb/data/impl/HoneycombReadInfraTest.java b/infra/it/it-test/src/test/java/io/fd/honeycomb/data/impl/HoneycombReadInfraTest.java
index 143317be0..53fd2e922 100644
--- a/infra/it/it-test/src/test/java/io/fd/honeycomb/data/impl/HoneycombReadInfraTest.java
+++ b/infra/it/it-test/src/test/java/io/fd/honeycomb/data/impl/HoneycombReadInfraTest.java
@@ -16,6 +16,22 @@
 
 package io.fd.honeycomb.data.impl;
 
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertThat;
+import static org.junit.Assert.assertTrue;
+import static org.mockito.Matchers.any;
+import static org.mockito.Matchers.anyListOf;
+import static org.mockito.Matchers.eq;
+import static org.mockito.Mockito.atLeastOnce;
+import static org.mockito.Mockito.atMost;
+import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.inOrder;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyNoMoreInteractions;
+
 import com.google.common.base.Optional;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Multimap;
@@ -28,15 +44,27 @@ import io.fd.honeycomb.translate.read.ReadContext;
 import io.fd.honeycomb.translate.read.ReadFailedException;
 import io.fd.honeycomb.translate.read.Reader;
 import io.fd.honeycomb.translate.read.registry.ReaderRegistry;
+import io.fd.honeycomb.translate.util.YangDAG;
 import io.fd.honeycomb.translate.util.RWUtils;
 import io.fd.honeycomb.translate.util.read.ReflexiveListReaderCustomizer;
 import io.fd.honeycomb.translate.util.read.ReflexiveReaderCustomizer;
+import java.lang.reflect.InvocationTargetException;
+import java.util.List;
+import java.util.stream.Collectors;
+import javax.annotation.Nonnull;
 import org.junit.Test;
 import org.mockito.InOrder;
 import org.mockito.Mock;
 import org.mockito.exceptions.misusing.MockitoConfigurationException;
 import org.mockito.invocation.InvocationOnMock;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.hc.test.rev150105.*;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.hc.test.rev150105.ComplexAugment;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.hc.test.rev150105.ComplexAugmentBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.hc.test.rev150105.ContainerWithList;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.hc.test.rev150105.ContainerWithListBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.hc.test.rev150105.SimpleAugment;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.hc.test.rev150105.SimpleAugmentBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.hc.test.rev150105.SimpleContainer;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.hc.test.rev150105.SimpleContainerBuilder;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.hc.test.rev150105.container.with.list.ListInContainer;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.hc.test.rev150105.container.with.list.ListInContainerBuilder;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.hc.test.rev150105.container.with.list.ListInContainerKey;
@@ -55,20 +83,7 @@ import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
 
-import javax.annotation.Nonnull;
-import java.lang.reflect.InvocationTargetException;
-import java.util.List;
-import java.util.stream.Collectors;
-
-import static org.hamcrest.CoreMatchers.is;
-import static org.junit.Assert.*;
-import static org.mockito.Matchers.any;
-import static org.mockito.Matchers.anyListOf;
-import static org.mockito.Matchers.eq;
-import static org.mockito.Mockito.*;
-
 public class HoneycombReadInfraTest extends AbstractInfraTest {
-
     @Mock
     private ReadContext ctx;
     private ReaderRegistry registry;
@@ -108,7 +123,7 @@ public class HoneycombReadInfraTest extends AbstractInfraTest {
     }
 
     private void initReaderRegistry() {
-        registry = new CompositeReaderRegistryBuilder()
+        registry = new CompositeReaderRegistryBuilder(new YangDAG())
                 .add(containerWithListReader) // 2
                 .addBefore(simpleContainerReader, Ids.CONTAINER_WITH_LIST_ID) // 1
                 .add(simpleAugmentReader) // 1.1
diff --git a/infra/it/it-test/src/test/java/io/fd/honeycomb/data/impl/HoneycombSubtreeReadInfraTest.java b/infra/it/it-test/src/test/java/io/fd/honeycomb/data/impl/HoneycombSubtreeReadInfraTest.java
index b513b5886..b586a186c 100644
--- a/infra/it/it-test/src/test/java/io/fd/honeycomb/data/impl/HoneycombSubtreeReadInfraTest.java
+++ b/infra/it/it-test/src/test/java/io/fd/honeycomb/data/impl/HoneycombSubtreeReadInfraTest.java
@@ -26,18 +26,15 @@ import com.google.common.collect.Multimap;
 import com.google.common.collect.Sets;
 import com.google.common.util.concurrent.CheckedFuture;
 import io.fd.honeycomb.translate.impl.read.GenericListReader;
+import io.fd.honeycomb.translate.impl.read.registry.CompositeReaderRegistryBuilder;
 import io.fd.honeycomb.translate.read.ListReader;
 import io.fd.honeycomb.translate.read.ReadContext;
 import io.fd.honeycomb.translate.read.ReadFailedException;
 import io.fd.honeycomb.translate.read.Reader;
 import io.fd.honeycomb.translate.read.registry.ReaderRegistry;
+import io.fd.honeycomb.translate.util.YangDAG;
 import io.fd.honeycomb.translate.util.read.ReflexiveListReaderCustomizer;
-import io.fd.honeycomb.translate.impl.read.registry.CompositeReaderRegistryBuilder;
-
-import java.util.Collections;
-import java.util.List;
 import java.util.stream.Collectors;
-import javax.annotation.Nonnull;
 import org.junit.Test;
 import org.mockito.Mock;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.hc.test.rev150105.ContainerWithList;
@@ -85,7 +82,7 @@ public class HoneycombSubtreeReadInfraTest extends AbstractInfraTest {
     }
 
     private void initReaderRegistry() {
-        registry = new CompositeReaderRegistryBuilder()
+        registry = new CompositeReaderRegistryBuilder(new YangDAG())
                 // Subtree reader handling its child list
                 .subtreeAdd(Sets.newHashSet(Ids.LIST_IN_CONTAINER_ID), containerWithListReader)
                 // Reflexive
diff --git a/infra/it/it-test/src/test/java/io/fd/honeycomb/data/impl/HoneycombWriteInfraTest.java b/infra/it/it-test/src/test/java/io/fd/honeycomb/data/impl/HoneycombWriteInfraTest.java
index bd51e39de..b98c91214 100644
--- a/infra/it/it-test/src/test/java/io/fd/honeycomb/data/impl/HoneycombWriteInfraTest.java
+++ b/infra/it/it-test/src/test/java/io/fd/honeycomb/data/impl/HoneycombWriteInfraTest.java
@@ -30,8 +30,9 @@ import com.google.common.collect.Lists;
 import com.google.common.collect.Sets;
 import io.fd.honeycomb.data.DataModification;
 import io.fd.honeycomb.translate.impl.write.registry.FlatWriterRegistryBuilder;
-import io.fd.honeycomb.translate.write.WriteFailedException;
+import io.fd.honeycomb.translate.util.YangDAG;
 import io.fd.honeycomb.translate.write.WriteContext;
+import io.fd.honeycomb.translate.write.WriteFailedException;
 import io.fd.honeycomb.translate.write.Writer;
 import io.fd.honeycomb.translate.write.registry.WriterRegistry;
 import java.util.ArrayList;
@@ -116,7 +117,7 @@ public class HoneycombWriteInfraTest extends AbstractInfraTest {
     }
 
     private void initWriterRegistry() {
-        writerRegistry = new FlatWriterRegistryBuilder()
+        writerRegistry = new FlatWriterRegistryBuilder(new YangDAG())
                 .add(complexAugmentWriter) // unordered
                 .add(nestedListWriter) // 6
                 .addAfter(listInContainerWriter, Ids.NESTED_LIST_ID) // 7
@@ -473,7 +474,7 @@ public class HoneycombWriteInfraTest extends AbstractInfraTest {
 
     @Test
     public void testSubtreeWriter() throws Exception {
-        writerRegistry = new FlatWriterRegistryBuilder()
+        writerRegistry = new FlatWriterRegistryBuilder(new YangDAG())
                 // Handles also container from grouping
                 .subtreeAdd(Sets.newHashSet(Ids.CONTAINER_FROM_GROUPING_ID), containerWithChoiceWriter)
                 .build();
diff --git a/infra/it/it-test/src/test/java/io/fd/honeycomb/data/impl/NestedAugmentationWriteTest.java b/infra/it/it-test/src/test/java/io/fd/honeycomb/data/impl/NestedAugmentationWriteTest.java
index 351b88e4a..3b7d4a1cb 100644
--- a/infra/it/it-test/src/test/java/io/fd/honeycomb/data/impl/NestedAugmentationWriteTest.java
+++ b/infra/it/it-test/src/test/java/io/fd/honeycomb/data/impl/NestedAugmentationWriteTest.java
@@ -25,6 +25,7 @@ import static org.mockito.Mockito.when;
 
 import io.fd.honeycomb.data.DataModification;
 import io.fd.honeycomb.translate.impl.write.registry.FlatWriterRegistryBuilder;
+import io.fd.honeycomb.translate.util.YangDAG;
 import io.fd.honeycomb.translate.write.WriteContext;
 import io.fd.honeycomb.translate.write.Writer;
 import io.fd.honeycomb.translate.write.registry.WriterRegistry;
@@ -132,7 +133,7 @@ public class NestedAugmentationWriteTest extends AbstractInfraTest {
     }
 
     private void initWriterRegistry() {
-        writerRegistry = new FlatWriterRegistryBuilder()
+        writerRegistry = new FlatWriterRegistryBuilder(new YangDAG())
             .add(augTargetWriter)
             .add(fromAugmentWriter)
             .add(listFromAugmentWriter)
diff --git a/infra/minimal-distribution/src/main/java/io/fd/honeycomb/infra/distro/data/config/WriterRegistryProvider.java b/infra/minimal-distribution/src/main/java/io/fd/honeycomb/infra/distro/data/config/WriterRegistryProvider.java
index e368266b7..6546ba2d2 100644
--- a/infra/minimal-distribution/src/main/java/io/fd/honeycomb/infra/distro/data/config/WriterRegistryProvider.java
+++ b/infra/minimal-distribution/src/main/java/io/fd/honeycomb/infra/distro/data/config/WriterRegistryProvider.java
@@ -19,6 +19,7 @@ package io.fd.honeycomb.infra.distro.data.config;
 import com.google.inject.Inject;
 import io.fd.honeycomb.infra.distro.ProviderTrait;
 import io.fd.honeycomb.translate.impl.write.registry.FlatWriterRegistryBuilder;
+import io.fd.honeycomb.translate.util.YangDAG;
 import io.fd.honeycomb.translate.write.WriterFactory;
 import io.fd.honeycomb.translate.write.registry.WriterRegistry;
 import java.util.HashSet;
@@ -31,7 +32,7 @@ public final class WriterRegistryProvider extends ProviderTrait<WriterRegistry>
 
     @Override
     protected WriterRegistry create() {
-        final FlatWriterRegistryBuilder builder = new FlatWriterRegistryBuilder();
+        final FlatWriterRegistryBuilder builder = new FlatWriterRegistryBuilder(new YangDAG());
         writerFactories
                 .stream()
                 .forEach(it -> it.init(builder));
diff --git a/infra/minimal-distribution/src/main/java/io/fd/honeycomb/infra/distro/data/oper/ReaderRegistryBuilderProvider.java b/infra/minimal-distribution/src/main/java/io/fd/honeycomb/infra/distro/data/oper/ReaderRegistryBuilderProvider.java
deleted file mode 100644
index ab967e164..000000000
--- a/infra/minimal-distribution/src/main/java/io/fd/honeycomb/infra/distro/data/oper/ReaderRegistryBuilderProvider.java
+++ /dev/null
@@ -1,40 +0,0 @@
-/*
- * Copyright (c) 2016 Cisco and/or its affiliates.
- *
- * 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 io.fd.honeycomb.infra.distro.data.oper;
-
-import com.google.inject.Inject;
-import io.fd.honeycomb.infra.distro.ProviderTrait;
-import io.fd.honeycomb.translate.read.ReaderFactory;
-import io.fd.honeycomb.translate.read.registry.ModifiableReaderRegistryBuilder;
-import io.fd.honeycomb.translate.impl.read.registry.CompositeReaderRegistryBuilder;
-import java.util.HashSet;
-import java.util.Set;
-
-public final class ReaderRegistryBuilderProvider extends ProviderTrait<ModifiableReaderRegistryBuilder> {
-
-    @Inject(optional = true)
-    private Set<ReaderFactory> readerFactories = new HashSet<>();
-
-    @Override
-    protected CompositeReaderRegistryBuilder create() {
-        final CompositeReaderRegistryBuilder builder = new CompositeReaderRegistryBuilder();
-        readerFactories.stream()
-                .forEach(it -> it.init(builder));
-        return builder;
-    }
-
-}
diff --git a/infra/minimal-distribution/src/main/java/io/fd/honeycomb/infra/distro/data/oper/ReaderRegistryProvider.java b/infra/minimal-distribution/src/main/java/io/fd/honeycomb/infra/distro/data/oper/ReaderRegistryProvider.java
index 86a5ff858..8f6bb0e6e 100644
--- a/infra/minimal-distribution/src/main/java/io/fd/honeycomb/infra/distro/data/oper/ReaderRegistryProvider.java
+++ b/infra/minimal-distribution/src/main/java/io/fd/honeycomb/infra/distro/data/oper/ReaderRegistryProvider.java
@@ -21,6 +21,7 @@ import io.fd.honeycomb.infra.distro.ProviderTrait;
 import io.fd.honeycomb.translate.impl.read.registry.CompositeReaderRegistryBuilder;
 import io.fd.honeycomb.translate.read.ReaderFactory;
 import io.fd.honeycomb.translate.read.registry.ReaderRegistry;
+import io.fd.honeycomb.translate.util.YangDAG;
 import java.util.HashSet;
 import java.util.Set;
 
@@ -31,7 +32,7 @@ public final class ReaderRegistryProvider extends ProviderTrait<ReaderRegistry>
 
     @Override
     protected ReaderRegistry create() {
-        final CompositeReaderRegistryBuilder builder = new CompositeReaderRegistryBuilder();
+        final CompositeReaderRegistryBuilder builder = new CompositeReaderRegistryBuilder(new YangDAG());
         readerFactories.stream()
             .forEach(it -> it.init(builder));
         return builder.build();
diff --git a/infra/translate-impl/src/main/java/io/fd/honeycomb/translate/impl/read/registry/CompositeReaderRegistryBuilder.java b/infra/translate-impl/src/main/java/io/fd/honeycomb/translate/impl/read/registry/CompositeReaderRegistryBuilder.java
index 9163e98de..f8290f166 100644
--- a/infra/translate-impl/src/main/java/io/fd/honeycomb/translate/impl/read/registry/CompositeReaderRegistryBuilder.java
+++ b/infra/translate-impl/src/main/java/io/fd/honeycomb/translate/impl/read/registry/CompositeReaderRegistryBuilder.java
@@ -16,6 +16,8 @@
 
 package io.fd.honeycomb.translate.impl.read.registry;
 
+import static com.google.common.base.Preconditions.checkArgument;
+
 import com.google.common.collect.ImmutableMap;
 import io.fd.honeycomb.translate.impl.read.GenericListReader;
 import io.fd.honeycomb.translate.impl.read.GenericReader;
@@ -26,14 +28,13 @@ import io.fd.honeycomb.translate.read.registry.ModifiableReaderRegistryBuilder;
 import io.fd.honeycomb.translate.read.registry.ReaderRegistry;
 import io.fd.honeycomb.translate.read.registry.ReaderRegistryBuilder;
 import io.fd.honeycomb.translate.util.AbstractSubtreeManagerRegistryBuilderBuilder;
-
+import io.fd.honeycomb.translate.util.YangDAG;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Set;
 import java.util.stream.Collectors;
 import javax.annotation.Nonnull;
 import javax.annotation.concurrent.NotThreadSafe;
-
 import org.opendaylight.yangtools.concepts.Builder;
 import org.opendaylight.yangtools.yang.binding.DataObject;
 import org.opendaylight.yangtools.yang.binding.Identifiable;
@@ -42,8 +43,6 @@ import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import static com.google.common.base.Preconditions.checkArgument;
-
 @NotThreadSafe
 public final class CompositeReaderRegistryBuilder
         extends AbstractSubtreeManagerRegistryBuilderBuilder<Reader<? extends DataObject, ? extends Builder<?>>, ReaderRegistry>
@@ -51,6 +50,10 @@ public final class CompositeReaderRegistryBuilder
 
     private static final Logger LOG = LoggerFactory.getLogger(CompositeReaderRegistryBuilder.class);
 
+    public CompositeReaderRegistryBuilder(@Nonnull final YangDAG yangDAG) {
+        super(yangDAG);
+    }
+
     @Override
     protected Reader<? extends DataObject, ? extends Builder<?>> getSubtreeHandler(@Nonnull final Set<InstanceIdentifier<?>> handledChildren,
                                                                                    @Nonnull final Reader<? extends DataObject, ? extends Builder<?>> reader) {
diff --git a/infra/translate-impl/src/main/java/io/fd/honeycomb/translate/impl/write/registry/FlatWriterRegistryBuilder.java b/infra/translate-impl/src/main/java/io/fd/honeycomb/translate/impl/write/registry/FlatWriterRegistryBuilder.java
index 936aa3c1e..0c6d0a1b4 100644
--- a/infra/translate-impl/src/main/java/io/fd/honeycomb/translate/impl/write/registry/FlatWriterRegistryBuilder.java
+++ b/infra/translate-impl/src/main/java/io/fd/honeycomb/translate/impl/write/registry/FlatWriterRegistryBuilder.java
@@ -18,11 +18,12 @@ package io.fd.honeycomb.translate.impl.write.registry;
 
 import com.google.common.annotations.VisibleForTesting;
 import com.google.common.collect.ImmutableMap;
-import io.fd.honeycomb.translate.write.registry.WriterRegistryBuilder;
 import io.fd.honeycomb.translate.util.AbstractSubtreeManagerRegistryBuilderBuilder;
+import io.fd.honeycomb.translate.util.YangDAG;
 import io.fd.honeycomb.translate.write.Writer;
 import io.fd.honeycomb.translate.write.registry.ModifiableWriterRegistryBuilder;
 import io.fd.honeycomb.translate.write.registry.WriterRegistry;
+import io.fd.honeycomb.translate.write.registry.WriterRegistryBuilder;
 import java.util.Set;
 import java.util.stream.Collectors;
 import javax.annotation.Nonnull;
@@ -42,6 +43,10 @@ public final class FlatWriterRegistryBuilder
 
     private static final Logger LOG = LoggerFactory.getLogger(FlatWriterRegistryBuilder.class);
 
+    public FlatWriterRegistryBuilder(@Nonnull final YangDAG yangDAG) {
+        super(yangDAG);
+    }
+
     @Override
     protected Writer<? extends DataObject> getSubtreeHandler(final @Nonnull Set<InstanceIdentifier<?>> handledChildren,
                                                              final @Nonnull Writer<? extends DataObject> writer) {
diff --git a/infra/translate-impl/src/test/java/io/fd/honeycomb/translate/impl/read/registry/CompositeReaderRegistryBuilderTest.java b/infra/translate-impl/src/test/java/io/fd/honeycomb/translate/impl/read/registry/CompositeReaderRegistryBuilderTest.java
index 0c7c71eac..1858f222a 100644
--- a/infra/translate-impl/src/test/java/io/fd/honeycomb/translate/impl/read/registry/CompositeReaderRegistryBuilderTest.java
+++ b/infra/translate-impl/src/test/java/io/fd/honeycomb/translate/impl/read/registry/CompositeReaderRegistryBuilderTest.java
@@ -26,6 +26,7 @@ import com.google.common.collect.Lists;
 import io.fd.honeycomb.translate.read.Reader;
 import io.fd.honeycomb.translate.read.registry.ReaderRegistry;
 import io.fd.honeycomb.translate.util.DataObjects;
+import io.fd.honeycomb.translate.util.YangDAG;
 import java.util.List;
 import java.util.Map;
 import org.junit.Test;
@@ -68,12 +69,12 @@ public class CompositeReaderRegistryBuilderTest {
 
     @Test(expected = IllegalArgumentException.class)
     public void testPreventStructuralReaderForList() {
-        new CompositeReaderRegistryBuilder().addStructuralReader(InstanceIdentifier.create(DataObjects.DataObjectK.class), DataObjects.DataObjectKBuilder.class);
+        new CompositeReaderRegistryBuilder(new YangDAG()).addStructuralReader(InstanceIdentifier.create(DataObjects.DataObjectK.class), DataObjects.DataObjectKBuilder.class);
     }
 
     @Test
     public void testCompositeStructure() throws Exception {
-        final CompositeReaderRegistryBuilder compositeReaderRegistryBuilder = new CompositeReaderRegistryBuilder();
+        final CompositeReaderRegistryBuilder compositeReaderRegistryBuilder = new CompositeReaderRegistryBuilder(new YangDAG());
         /*
             Composite reader structure ordered left from right
 
diff --git a/infra/translate-impl/src/test/java/io/fd/honeycomb/translate/impl/write/registry/FlatWriterRegistryBuilderTest.java b/infra/translate-impl/src/test/java/io/fd/honeycomb/translate/impl/write/registry/FlatWriterRegistryBuilderTest.java
index 3a6767265..feaba726c 100644
--- a/infra/translate-impl/src/test/java/io/fd/honeycomb/translate/impl/write/registry/FlatWriterRegistryBuilderTest.java
+++ b/infra/translate-impl/src/test/java/io/fd/honeycomb/translate/impl/write/registry/FlatWriterRegistryBuilderTest.java
@@ -32,6 +32,7 @@ import com.google.common.collect.Lists;
 import com.google.common.collect.Multimaps;
 import com.google.common.collect.Sets;
 import io.fd.honeycomb.translate.util.DataObjects;
+import io.fd.honeycomb.translate.util.YangDAG;
 import io.fd.honeycomb.translate.write.DataObjectUpdate;
 import io.fd.honeycomb.translate.write.WriteContext;
 import io.fd.honeycomb.translate.write.Writer;
@@ -45,10 +46,9 @@ import org.opendaylight.yangtools.yang.binding.DataObject;
 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
 
 public class FlatWriterRegistryBuilderTest {
-
     @Test
     public void testRelationsBefore() throws Exception {
-        final FlatWriterRegistryBuilder flatWriterRegistryBuilder = new FlatWriterRegistryBuilder();
+        final FlatWriterRegistryBuilder flatWriterRegistryBuilder = new FlatWriterRegistryBuilder(new YangDAG());
         /*
             1   ->  2   ->  3
                         ->  4
@@ -70,7 +70,7 @@ public class FlatWriterRegistryBuilderTest {
 
     @Test
     public void testBuild() throws Exception {
-        final FlatWriterRegistryBuilder flatWriterRegistryBuilder = new FlatWriterRegistryBuilder();
+        final FlatWriterRegistryBuilder flatWriterRegistryBuilder = new FlatWriterRegistryBuilder(new YangDAG());
         final Writer<? extends DataObject> writer = mockWriter(DataObjects.DataObject3.class);
         flatWriterRegistryBuilder.add(writer);
         final WriterRegistry build = flatWriterRegistryBuilder.build();
@@ -94,7 +94,7 @@ public class FlatWriterRegistryBuilderTest {
 
     @Test(expected = IllegalArgumentException.class)
     public void testBuildUnknownWriter() throws Exception {
-        final FlatWriterRegistryBuilder flatWriterRegistryBuilder = new FlatWriterRegistryBuilder();
+        final FlatWriterRegistryBuilder flatWriterRegistryBuilder = new FlatWriterRegistryBuilder(new YangDAG());
         final Writer<? extends DataObject> writer = mockWriter(DataObjects.DataObject3.class);
         flatWriterRegistryBuilder.add(writer);
         final WriterRegistry build = flatWriterRegistryBuilder.build();
@@ -109,7 +109,7 @@ public class FlatWriterRegistryBuilderTest {
 
     @Test
     public void testRelationsAfter() throws Exception {
-        final FlatWriterRegistryBuilder flatWriterRegistryBuilder = new FlatWriterRegistryBuilder();
+        final FlatWriterRegistryBuilder flatWriterRegistryBuilder = new FlatWriterRegistryBuilder(new YangDAG());
         /*
             1   ->  2   ->  3
                         ->  4
@@ -131,7 +131,7 @@ public class FlatWriterRegistryBuilderTest {
 
     @Test(expected = IllegalArgumentException.class)
     public void testRelationsLoop() throws Exception {
-        final FlatWriterRegistryBuilder flatWriterRegistryBuilder = new FlatWriterRegistryBuilder();
+        final FlatWriterRegistryBuilder flatWriterRegistryBuilder = new FlatWriterRegistryBuilder(new YangDAG());
         /*
             1   ->  2   ->  1
          */
@@ -142,14 +142,14 @@ public class FlatWriterRegistryBuilderTest {
 
     @Test(expected = IllegalArgumentException.class)
     public void testAddWriterTwice() throws Exception {
-        final FlatWriterRegistryBuilder flatWriterRegistryBuilder = new FlatWriterRegistryBuilder();
+        final FlatWriterRegistryBuilder flatWriterRegistryBuilder = new FlatWriterRegistryBuilder(new YangDAG());
         flatWriterRegistryBuilder.add(mockWriter(DataObjects.DataObject1.class));
         flatWriterRegistryBuilder.add(mockWriter(DataObjects.DataObject1.class));
     }
 
     @Test
     public void testAddSubtreeWriter() throws Exception {
-        final FlatWriterRegistryBuilder flatWriterRegistryBuilder = new FlatWriterRegistryBuilder();
+        final FlatWriterRegistryBuilder flatWriterRegistryBuilder = new FlatWriterRegistryBuilder(new YangDAG());
         flatWriterRegistryBuilder.subtreeAdd(
                 Sets.newHashSet(DataObjects.DataObject4.DataObject41.IID,
                                 DataObjects.DataObject4.DataObject41.IID),
diff --git a/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/AbstractSubtreeManagerRegistryBuilderBuilder.java b/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/AbstractSubtreeManagerRegistryBuilderBuilder.java
index 6a19ed220..fe2f1178f 100644
--- a/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/AbstractSubtreeManagerRegistryBuilderBuilder.java
+++ b/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/AbstractSubtreeManagerRegistryBuilderBuilder.java
@@ -18,7 +18,6 @@ package io.fd.honeycomb.translate.util;
 
 import com.google.common.base.Preconditions;
 import com.google.common.collect.ImmutableMap;
-import com.google.common.collect.Sets;
 import io.fd.honeycomb.translate.ModifiableSubtreeManagerRegistryBuilder;
 import io.fd.honeycomb.translate.SubtreeManager;
 import io.fd.honeycomb.translate.SubtreeManagerRegistryBuilder;
@@ -27,17 +26,18 @@ import java.util.HashMap;
 import java.util.Map;
 import java.util.Set;
 import javax.annotation.Nonnull;
-import org.jgrapht.experimental.dag.DirectedAcyclicGraph;
 import org.opendaylight.yangtools.yang.binding.DataObject;
 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
 
 public abstract class AbstractSubtreeManagerRegistryBuilderBuilder<S extends SubtreeManager<? extends DataObject>, R>
-        implements ModifiableSubtreeManagerRegistryBuilder<S>, SubtreeManagerRegistryBuilder<R>, AutoCloseable {
+        implements ModifiableSubtreeManagerRegistryBuilder<S>, SubtreeManagerRegistryBuilder<R> {
 
-    // Using directed acyclic graph to represent the ordering relationships between writers
-    private final DirectedAcyclicGraph<InstanceIdentifier<?>, Order>
-            handlersRelations = new DirectedAcyclicGraph<>((sourceVertex, targetVertex) -> new Order());
     private final Map<InstanceIdentifier<?>, S> handlersMap = new HashMap<>();
+    private final YangDAG dag;
+
+    protected AbstractSubtreeManagerRegistryBuilderBuilder(@Nonnull final YangDAG yangDAG) {
+        this.dag = Preconditions.checkNotNull(yangDAG, "yangDAG should not be null");
+    }
 
     /**
      * Add handler without any special relationship to any other type.
@@ -49,7 +49,7 @@ public abstract class AbstractSubtreeManagerRegistryBuilderBuilder<S extends Sub
         // not be matched to writers in registry
         final InstanceIdentifier<?> targetType = RWUtils.makeIidWildcarded(handler.getManagedDataObjectType());
         checkWriterNotPresentYet(targetType);
-        handlersRelations.addVertex(targetType);
+        dag.addVertex(targetType);
         handlersMap.put(targetType, handler);
         return this;
     }
@@ -78,9 +78,9 @@ public abstract class AbstractSubtreeManagerRegistryBuilderBuilder<S extends Sub
         final InstanceIdentifier<?> targetType = RWUtils.makeIidWildcarded(handler.getManagedDataObjectType());
         final InstanceIdentifier<?> wildcardedRelatedType = RWUtils.makeIidWildcarded(relatedType);
         checkWriterNotPresentYet(targetType);
-        handlersRelations.addVertex(targetType);
-        handlersRelations.addVertex(wildcardedRelatedType);
-        addEdge(targetType, wildcardedRelatedType);
+        dag.addVertex(targetType);
+        dag.addVertex(wildcardedRelatedType);
+        dag.addEdge(targetType, wildcardedRelatedType);
         handlersMap.put(targetType, handler);
         return this;
     }
@@ -90,13 +90,13 @@ public abstract class AbstractSubtreeManagerRegistryBuilderBuilder<S extends Sub
                                                                         @Nonnull final Collection<InstanceIdentifier<?>> relatedTypes) {
         final InstanceIdentifier<?> targetType = RWUtils.makeIidWildcarded(handler.getManagedDataObjectType());
         checkWriterNotPresentYet(targetType);
-        handlersRelations.addVertex(targetType);
+        dag.addVertex(targetType);
         relatedTypes.stream()
                 .map(RWUtils::makeIidWildcarded)
-                .forEach(handlersRelations::addVertex);
+                .forEach(dag::addVertex);
         relatedTypes.stream()
                 .map(RWUtils::makeIidWildcarded)
-                .forEach(type -> addEdge(targetType, type));
+                .forEach(type -> dag.addEdge(targetType, type));
         handlersMap.put(targetType, handler);
         return this;
     }
@@ -129,10 +129,10 @@ public abstract class AbstractSubtreeManagerRegistryBuilderBuilder<S extends Sub
         final InstanceIdentifier<?> targetType = RWUtils.makeIidWildcarded(handler.getManagedDataObjectType());
         final InstanceIdentifier<?> wildcardedRelatedType = RWUtils.makeIidWildcarded(relatedType);
         checkWriterNotPresentYet(targetType);
-        handlersRelations.addVertex(targetType);
-        handlersRelations.addVertex(wildcardedRelatedType);
+        dag.addVertex(targetType);
+        dag.addVertex(wildcardedRelatedType);
         // set edge to indicate before relationship, just reversed
-        addEdge(wildcardedRelatedType, targetType);
+        dag.addEdge(wildcardedRelatedType, targetType);
         handlersMap.put(targetType, handler);
         return this;
     }
@@ -142,14 +142,14 @@ public abstract class AbstractSubtreeManagerRegistryBuilderBuilder<S extends Sub
                                                                        @Nonnull final Collection<InstanceIdentifier<?>> relatedTypes) {
         final InstanceIdentifier<?> targetType = RWUtils.makeIidWildcarded(handler.getManagedDataObjectType());
         checkWriterNotPresentYet(targetType);
-        handlersRelations.addVertex(targetType);
+        dag.addVertex(targetType);
         relatedTypes.stream()
                 .map(RWUtils::makeIidWildcarded)
-                .forEach(handlersRelations::addVertex);
+                .forEach(dag::addVertex);
         // set edge to indicate before relationship, just reversed
         relatedTypes.stream()
                 .map(RWUtils::makeIidWildcarded)
-                .forEach(type -> addEdge(type, targetType));
+                .forEach(type -> dag.addEdge(type, targetType));
         handlersMap.put(targetType, handler);
         return this;
     }
@@ -170,22 +170,10 @@ public abstract class AbstractSubtreeManagerRegistryBuilderBuilder<S extends Sub
         return addAfter(getSubtreeHandler(handledChildren, handler), relatedTypes);
     }
 
-
-    private void addEdge(final InstanceIdentifier<?> targetType,
-                         final InstanceIdentifier<?> relatedType) {
-        try {
-            handlersRelations.addDagEdge(targetType, relatedType);
-        } catch (DirectedAcyclicGraph.CycleFoundException e) {
-            throw new IllegalArgumentException(String.format(
-                    "Unable to add writer with relation: %s -> %s. Loop detected", targetType, relatedType), e);
-        }
-    }
-
     protected ImmutableMap<InstanceIdentifier<?>, S> getMappedHandlers() {
         final ImmutableMap.Builder<InstanceIdentifier<?>, S> builder = ImmutableMap.builder();
         // Iterate writer types according to their relationships from graph
-        handlersRelations.iterator()
-                .forEachRemaining(handlerType -> {
+        dag.iterator().forEachRemaining(handlerType -> {
                     // There might be types stored just for relationship sake, no real writer, ignoring those
                     if (handlersMap.containsKey(handlerType)) {
                         builder.put(handlerType, handlersMap.get(handlerType));
@@ -199,15 +187,4 @@ public abstract class AbstractSubtreeManagerRegistryBuilderBuilder<S extends Sub
 
         return builder.build();
     }
-
-    @Override
-    public void close() throws Exception {
-        handlersMap.clear();
-        // Wrap sets into another set to avoid concurrent modification ex in graph
-        handlersRelations.removeAllEdges(Sets.newHashSet(handlersRelations.edgeSet()));
-        handlersRelations.removeAllVertices(Sets.newHashSet(handlersRelations.vertexSet()));
-    }
-
-    // Represents edges in graph
-    private class Order {}
 }
diff --git a/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/YangDAG.java b/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/YangDAG.java
new file mode 100644
index 000000000..2269adbff
--- /dev/null
+++ b/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/YangDAG.java
@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ *
+ * 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 io.fd.honeycomb.translate.util;
+
+import java.util.Iterator;
+import org.jgrapht.experimental.dag.DirectedAcyclicGraph;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+/**
+ * Directed acyclic graph representing ordering relationships between schema nodes represented as wildcarded
+ * InstanceIdentifiers. Maintains topological order of vertices. Feature is used by translation layer if more nodes are
+ * affected in single read/write transaction.
+ */
+public final class YangDAG {
+
+    private final DirectedAcyclicGraph<InstanceIdentifier<?>, Edge>
+        dag = new DirectedAcyclicGraph<>((sourceVertex, targetVertex) -> new Edge());
+
+    /**
+     * Adds the vertex if it wasn't already in the graph.
+     *
+     * @param vertex vertex to be added
+     */
+    public void addVertex(final InstanceIdentifier<?> vertex) {
+        dag.addVertex(vertex);
+    }
+
+    /**
+     * Adds edge between source and target vertices.
+     *
+     * @param source source vertex of the edge
+     * @param target target vertex of the edge
+     * @throws IllegalArgumentException if the edge would induce a cycle in the graph
+     */
+    public void addEdge(final InstanceIdentifier<?> source, final InstanceIdentifier<?> target) {
+        try {
+            dag.addDagEdge(source, target);
+        } catch (DirectedAcyclicGraph.CycleFoundException e) {
+            throw new IllegalArgumentException(String.format(
+                "Unable to add writer with relation: %s -> %s. Loop detected", source, target), e);
+        }
+    }
+
+    /**
+     * Traverses schema nodes in topological order.
+     *
+     * @return an iterator that will traverse the graph in topological order.
+     */
+    public Iterator<InstanceIdentifier<?>> iterator() {
+        return dag.iterator();
+    }
+
+    private static final class Edge {
+    }
+}
diff --git a/infra/translate-utils/src/test/java/io/fd/honeycomb/translate/util/YangDAGTest.java b/infra/translate-utils/src/test/java/io/fd/honeycomb/translate/util/YangDAGTest.java
new file mode 100644
index 000000000..1c8fb5442
--- /dev/null
+++ b/infra/translate-utils/src/test/java/io/fd/honeycomb/translate/util/YangDAGTest.java
@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ *
+ * 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 io.fd.honeycomb.translate.util;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import java.util.Iterator;
+import org.jgrapht.experimental.dag.DirectedAcyclicGraph;
+import org.junit.Before;
+import org.junit.Test;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+public class YangDAGTest {
+
+    private static final InstanceIdentifier<DataObjects.DataObject1> VERTEX_A = DataObjects.DataObject1.IID;
+    private static final InstanceIdentifier<DataObjects.DataObject2> VERTEX_B = DataObjects.DataObject2.IID;
+
+    private YangDAG dag;
+
+    @Before
+    public void setUp() {
+        dag = new YangDAG();
+    }
+    @Test
+    public void testAddVertex() {
+        dag.addVertex(VERTEX_A);
+        final Iterator<InstanceIdentifier<?>> it = dag.iterator();
+        assertEquals(VERTEX_A, it.next());
+        assertFalse(it.hasNext());
+    }
+
+    @Test
+    public void testAddEdge() {
+        dag.addVertex(VERTEX_A);
+        dag.addVertex(VERTEX_B);
+        dag.addEdge(VERTEX_A, VERTEX_B);
+        final Iterator<InstanceIdentifier<?>> it = dag.iterator();
+        assertEquals(VERTEX_A, it.next());
+        assertEquals(VERTEX_B, it.next());
+        assertFalse(it.hasNext());
+    }
+
+    @Test
+    public void testAddCycleFails() {
+        dag.addVertex(VERTEX_A);
+        dag.addVertex(VERTEX_B);
+        dag.addEdge(VERTEX_A, VERTEX_B);
+        try {
+            dag.addEdge(VERTEX_B, VERTEX_A);
+        } catch (IllegalArgumentException e) {
+            assertTrue(e.getCause() instanceof DirectedAcyclicGraph.CycleFoundException);
+        }
+    }
+}
\ No newline at end of file