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diff --git a/cpp/src/qpid/legacystore/PreparedTransaction.h b/cpp/src/qpid/legacystore/PreparedTransaction.h
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+++ b/cpp/src/qpid/legacystore/PreparedTransaction.h
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+/*
+ *
+ * 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.
+ *
+ */
+
+#ifndef QPID_LEGACYSTORE_PREPAREDTRANSACTION_H
+#define QPID_LEGACYSTORE_PREPAREDTRANSACTION_H
+
+#include <list>
+#include <map>
+#include <set>
+#include <string>
+#include <boost/shared_ptr.hpp>
+#include <boost/ptr_container/ptr_list.hpp>
+
+namespace mrg{
+namespace msgstore{
+
+typedef u_int64_t queue_id;
+typedef u_int64_t message_id;
+
+class LockedMappings
+{
+public:
+    typedef boost::shared_ptr<LockedMappings> shared_ptr;
+    typedef std::map<std::string, shared_ptr> map;
+    typedef std::pair<queue_id, message_id> idpair;
+    typedef std::list<idpair>::iterator iterator;
+
+    void add(queue_id queue, message_id message);
+    bool isLocked(queue_id queue, message_id message);
+    std::size_t size() { return locked.size(); }
+    iterator begin() { return locked.begin(); }
+    iterator end() { return locked.end(); }
+
+    static void add(LockedMappings::map& map, std::string& key, queue_id queue, message_id message);
+
+private:
+    std::list<idpair> locked;
+};
+
+struct PreparedTransaction
+{
+    typedef boost::ptr_list<PreparedTransaction> list;
+
+    const std::string xid;
+    const LockedMappings::shared_ptr enqueues;
+    const LockedMappings::shared_ptr dequeues;
+
+    PreparedTransaction(const std::string& xid, LockedMappings::shared_ptr enqueues, LockedMappings::shared_ptr dequeues);
+    bool isLocked(queue_id queue, message_id message);
+    static bool isLocked(PreparedTransaction::list& txns, queue_id queue, message_id message);
+    static PreparedTransaction::list::iterator getLockedPreparedTransaction(PreparedTransaction::list& txns, queue_id queue, message_id message);
+};
+
+}}
+
+#endif // ifndef QPID_LEGACYSTORE_PREPAREDTRANSACTION_H