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diff --git a/qpid/cpp/src/qpid/ha/IdSetter.h b/qpid/cpp/src/qpid/ha/IdSetter.h
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+#ifndef QPID_HA_IDSETTER_H
+#define QPID_HA_IDSETTER_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 "types.h"
+
+#include "qpid/broker/Message.h"
+#include "qpid/broker/MessageInterceptor.h"
+#include "qpid/log/Statement.h"
+#include "qpid/sys/Mutex.h"
+#include "qpid/sys/AtomicValue.h"
+
+
+namespace qpid {
+namespace ha {
+class LogPrefix;
+
+/**
+ * A MessageInterceptor that sets the ReplicationId on each message as it is
+ * enqueued on a primary queue.
+ *
+ * THREAD UNSAFE: Called sequentially under the queue lock.
+ */
+class IdSetter : public broker::MessageInterceptor
+{
+  public:
+    IdSetter(const LogPrefix& lp, const std::string& q, ReplicationId firstId=1) :
+        logPrefix(lp), queue(q), nextId(firstId)
+    {}
+
+    void record(broker::Message& m) {
+        // Record is called when a message is first delivered to a queue, before it has
+        // been enqueued or saved in a transaction buffer. This is when we normally want
+        // to assign a replication-id.
+        m.setReplicationId(nextId++);
+    }
+
+    void publish(broker::Message& m) {
+        // Publish is called when a message is assigned a position on the queue,
+        // after any transaction has comitted. Normally this is too late to
+        // assign a replication-id but during broker start-up and recovery from
+        // store record() is not called, so set the ID now if not already set.
+        if (!m.hasReplicationId()) {
+            m.setReplicationId(nextId++);
+        }
+    }
+
+  private:
+    const LogPrefix& logPrefix;
+    std::string queue;
+    sys::AtomicValue<uint32_t> nextId;
+};
+
+}} // namespace qpid::ha
+
+#endif  /*!QPID_HA_IDSETTER_H*/