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diff --git a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/databroker/actors/dds/AbstractProxyHistory.java b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/databroker/actors/dds/AbstractProxyHistory.java
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+/*
+ * Copyright (c) 2016 Cisco Systems, Inc. and others.  All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.controller.cluster.databroker.actors.dds;
+
+import akka.actor.ActorRef;
+import com.google.common.base.Preconditions;
+import java.util.Optional;
+import org.opendaylight.controller.cluster.access.concepts.LocalHistoryIdentifier;
+import org.opendaylight.controller.cluster.access.concepts.TransactionIdentifier;
+import org.opendaylight.yangtools.concepts.Identifiable;
+import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTree;
+
+/**
+ * Per-connection representation of a local history.
+ *
+ * @author Robert Varga
+ */
+abstract class AbstractProxyHistory implements Identifiable<LocalHistoryIdentifier> {
+    // FIXME: this should really be ClientConnection
+    private final DistributedDataStoreClientBehavior client;
+    private final LocalHistoryIdentifier identifier;
+
+    AbstractProxyHistory(final DistributedDataStoreClientBehavior client, final LocalHistoryIdentifier identifier) {
+        this.client = Preconditions.checkNotNull(client);
+        this.identifier = Preconditions.checkNotNull(identifier);
+    }
+
+    static AbstractProxyHistory create(final DistributedDataStoreClientBehavior client,
+            final Optional<ShardBackendInfo> backendInfo, final LocalHistoryIdentifier identifier) {
+        final Optional<DataTree> dataTree = backendInfo.flatMap(ShardBackendInfo::getDataTree);
+        return dataTree.isPresent() ? new LocalProxyHistory(client, identifier, dataTree.get()) : new RemoteProxyHistory(client, identifier);
+    }
+
+    @Override
+    public LocalHistoryIdentifier getIdentifier() {
+        return identifier;
+    }
+
+    final ActorRef localActor() {
+        return client.self();
+    }
+
+    final AbstractProxyTransaction createTransactionProxy(final TransactionIdentifier txId) {
+        return doCreateTransactionProxy(client, new TransactionIdentifier(identifier, txId.getTransactionId()));
+    }
+
+    abstract AbstractProxyTransaction doCreateTransactionProxy(DistributedDataStoreClientBehavior client,
+            TransactionIdentifier txId);
+}