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diff --git a/trunk/qpid/cpp/src/qpid/broker/MessageStore.h b/trunk/qpid/cpp/src/qpid/broker/MessageStore.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 _MessageStore_
+#define _MessageStore_
+
+#include "qpid/broker/PersistableExchange.h"
+#include "qpid/broker/PersistableMessage.h"
+#include "qpid/broker/PersistableQueue.h"
+#include "qpid/broker/PersistableConfig.h"
+#include "qpid/broker/RecoveryManager.h"
+#include "qpid/broker/TransactionalStore.h"
+#include "qpid/framing/FieldTable.h"
+
+#include <qpid/Options.h>
+
+#include <boost/shared_ptr.hpp>
+#include <boost/intrusive_ptr.hpp>
+
+namespace qpid {
+namespace broker {
+
+/**
+ * An abstraction of the persistent storage for messages. (In
+ * all methods, any pointers/references to queues or messages
+ * are valid only for the duration of the call).
+ */
+class MessageStore : public TransactionalStore, public Recoverable {
+  public:
+
+    /**
+     * If called after initialization but before recovery, will discard the database
+     * and reinitialize using an empty store dir. If the parameter pushDownStoreFiles
+     * is true, the content of the store dir will be moved to a backup dir inside the
+     * store dir. This is used when cluster nodes recover and must get thier content
+     * from a cluster sync rather than directly fromt the store.
+     *
+     * @param pushDownStoreFiles If true, will move content of the store dir into a
+     *                           subdir, leaving the store dir otherwise empty.
+     */
+    virtual void truncateInit(const bool pushDownStoreFiles = false) = 0;
+
+    /**
+     * Record the existence of a durable queue
+     */
+    virtual void create(PersistableQueue& queue,
+                        const framing::FieldTable& args) = 0;
+    /**
+     * Destroy a durable queue
+     */
+    virtual void destroy(PersistableQueue& queue) = 0;
+
+    /**
+     * Record the existence of a durable exchange
+     */
+    virtual void create(const PersistableExchange& exchange,
+                        const framing::FieldTable& args) = 0;
+    /**
+     * Destroy a durable exchange
+     */
+    virtual void destroy(const PersistableExchange& exchange) = 0;
+
+    /**
+     * Record a binding
+     */
+    virtual void bind(const PersistableExchange& exchange, const PersistableQueue& queue,
+                      const std::string& key, const framing::FieldTable& args) = 0;
+
+    /**
+     * Forget a binding
+     */
+    virtual void unbind(const PersistableExchange& exchange, const PersistableQueue& queue,
+                        const std::string& key, const framing::FieldTable& args) = 0;
+
+    /**
+     * Record generic durable configuration
+     */
+    virtual void create(const PersistableConfig& config) = 0;
+
+    /**
+     * Destroy generic durable configuration
+     */
+    virtual void destroy(const PersistableConfig& config) = 0;
+
+    /**
+     * Stores a messages before it has been enqueued
+     * (enqueueing automatically stores the message so this is
+     * only required if storage is required prior to that
+     * point). If the message has not yet been stored it will
+     * store the headers as well as any content passed in. A
+     * persistence id will be set on the message which can be
+     * used to load the content or to append to it.
+     */
+    virtual void stage(const boost::intrusive_ptr<PersistableMessage>& msg) = 0;
+
+    /**
+     * Destroys a previously staged message. This only needs
+     * to be called if the message is never enqueued. (Once
+     * enqueued, deletion will be automatic when the message
+     * is dequeued from all queues it was enqueued onto).
+     */
+    virtual void destroy(PersistableMessage& msg) = 0;
+
+    /**
+     * Appends content to a previously staged message
+     */
+    virtual void appendContent(const boost::intrusive_ptr<const PersistableMessage>& msg,
+                               const std::string& data) = 0;
+
+    /**
+     * Loads (a section) of content data for the specified
+     * message (previously stored through a call to stage or
+     * enqueue) into data. The offset refers to the content
+     * only (i.e. an offset of 0 implies that the start of the
+     * content should be loaded, not the headers or related
+     * meta-data).
+     */
+    virtual void loadContent(const qpid::broker::PersistableQueue& queue,
+                             const boost::intrusive_ptr<const PersistableMessage>& msg,
+                             std::string& data, uint64_t offset, uint32_t length) = 0;
+
+    /**
+     * Enqueues a message, storing the message if it has not
+     * been previously stored and recording that the given
+     * message is on the given queue.
+     *
+     * Note: that this is async so the return of the function does
+     * not mean the opperation is complete.
+     *
+     * @param msg the message to enqueue
+     * @param queue the name of the queue onto which it is to be enqueued
+     * @param xid (a pointer to) an identifier of the
+     * distributed transaction in which the operation takes
+     * place or null for 'local' transactions
+     */
+    virtual void enqueue(TransactionContext* ctxt,
+                         const boost::intrusive_ptr<PersistableMessage>& msg,
+                         const PersistableQueue& queue) = 0;
+
+    /**
+     * Dequeues a message, recording that the given message is
+     * no longer on the given queue and deleting the message
+     * if it is no longer on any other queue.
+     *
+     * Note: that this is async so the return of the function does
+     * not mean the opperation is complete.
+     *
+     * @param msg the message to dequeue
+     * @param queue the name of the queue from which it is to be dequeued
+     * @param xid (a pointer to) an identifier of the
+     * distributed transaction in which the operation takes
+     * place or null for 'local' transactions
+     */
+    virtual void dequeue(TransactionContext* ctxt,
+                         const boost::intrusive_ptr<PersistableMessage>& msg,
+                         const PersistableQueue& queue) = 0;
+
+    /**
+     * Flushes all async messages to disk for the specified queue
+     *
+     * Note: that this is async so the return of the function does
+     * not mean the opperation is complete.
+     *
+     * @param queue the name of the queue from which it is to be dequeued
+     */
+    virtual void flush(const qpid::broker::PersistableQueue& queue)=0;
+
+    /**
+     * Returns the number of outstanding AIO's for a given queue
+     *
+     * If 0, than all the enqueue / dequeues have been stored
+     * to disk
+     *
+     * @param queue the name of the queue to check for outstanding AIO
+     */
+    virtual uint32_t outstandingQueueAIO(const PersistableQueue& queue) = 0;
+
+
+    virtual ~MessageStore(){}
+};
+
+}
+}
+
+
+#endif