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diff --git a/qpid/cpp/src/qpid/ha/TxReplicator.h b/qpid/cpp/src/qpid/ha/TxReplicator.h
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+++ b/qpid/cpp/src/qpid/ha/TxReplicator.h
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+#ifndef QPID_HA_TRANSACTIONREPLICATOR_H
+#define QPID_HA_TRANSACTIONREPLICATOR_H
+
+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ *
+ */
+
+#include "LogPrefix.h"
+#include "QueueReplicator.h"
+#include "Event.h"
+#include "qpid/broker/DeliveryRecord.h"
+#include "qpid/broker/TransactionalStore.h"
+#include "qpid/sys/Mutex.h"
+#include "qpid/types/Uuid.h"
+
+namespace qpid {
+
+namespace broker {
+class TxBuffer;
+class TxAccept;
+class DtxBuffer;
+class Broker;
+class MessageStore;
+class Deliverable;
+}
+
+namespace ha {
+class BrokerReplicator;
+
+/**
+ * Exchange created on a backup broker to replicate a transaction on the primary.
+ *
+ * Subscribes to a tx-queue like a normal queue but puts replicated messages and
+ * transaction events into a local TxBuffer.
+ *
+ * THREAD SAFE: Called in different connection threads.
+ */
+class TxReplicator : public QueueReplicator {
+  public:
+    typedef boost::shared_ptr<broker::Queue> QueuePtr;
+    typedef boost::shared_ptr<broker::Link> LinkPtr;
+
+    static bool isTxQueue(const std::string& queue);
+    static types::Uuid getTxId(const std::string& queue);
+
+    static boost::shared_ptr<TxReplicator> create(
+        HaBroker&, const QueuePtr& txQueue, const LinkPtr& link);
+
+    ~TxReplicator();
+
+    std::string getType() const;
+
+    // QueueReplicator overrides
+    using QueueReplicator::destroy;
+    void destroy(sys::Mutex::ScopedLock&);
+
+  protected:
+
+    void deliver(const broker::Message&);
+
+  private:
+
+    typedef void (TxReplicator::*DispatchFunction)(
+        const std::string&, sys::Mutex::ScopedLock&);
+    typedef qpid::sys::unordered_map<std::string, DispatchFunction> DispatchMap;
+    typedef qpid::sys::unordered_map<std::string, ReplicationIdSet> DequeueMap;
+
+    TxReplicator(HaBroker&, const QueuePtr& txQueue, const LinkPtr& link);
+    void sendMessage(const broker::Message&, sys::Mutex::ScopedLock&);
+    void enqueue(const std::string& data, sys::Mutex::ScopedLock&);
+    void dequeue(const std::string& data, sys::Mutex::ScopedLock&);
+    void prepare(const std::string& data, sys::Mutex::ScopedLock&);
+    void commit(const std::string& data, sys::Mutex::ScopedLock&);
+    void rollback(const std::string& data, sys::Mutex::ScopedLock&);
+    void backups(const std::string& data, sys::Mutex::ScopedLock&);
+    void end(sys::Mutex::ScopedLock&);
+
+    LogPrefix2 logPrefix;
+    TxEnqueueEvent enq;         // Enqueue data for next deliver.
+    boost::intrusive_ptr<broker::TxBuffer> txBuffer;
+    broker::MessageStore* store;
+    std::auto_ptr<broker::TransactionContext> context;
+    framing::ChannelId channel; // Channel to send prepare-complete.
+    bool empty, ended;
+
+    // Class to process dequeues and create DeliveryRecords to populate a
+    // TxAccept.
+    class DequeueState {
+      public:
+        DequeueState(broker::QueueRegistry& qr) : queues(qr) {}
+        void add(const TxDequeueEvent&);
+        boost::shared_ptr<broker::TxAccept> makeAccept();
+
+      private:
+        // Delivery record IDs are command IDs from the session.
+        // On a backup we will just fake these Ids.
+        typedef framing::SequenceNumber Id;
+        typedef framing::SequenceSet IdSet;
+        typedef qpid::sys::unordered_map<std::string, ReplicationIdSet> EventMap;
+
+        bool addRecord(const broker::Message& m,
+                       const boost::shared_ptr<broker::Queue>&,
+                       const ReplicationIdSet& );
+        void addRecords(const DequeueMap::value_type& entry);
+
+        broker::QueueRegistry& queues;
+        EventMap events;
+        broker::DeliveryRecords records;
+        broker::QueueCursor cursor;
+        framing::SequenceNumber nextId;
+        IdSet recordIds;
+    };
+    DequeueState dequeueState;
+};
+
+
+}} // namespace qpid::ha
+
+#endif  /*!QPID_HA_TRANSACTIONREPLICATOR_H*/