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diff --git a/qpid/cpp/src/qpid/broker/PreviewSessionManager.h b/qpid/cpp/src/qpid/broker/PreviewSessionManager.h
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+++ b/qpid/cpp/src/qpid/broker/PreviewSessionManager.h
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+#ifndef QPID_BROKER_PREVIEWSESSIONMANAGER_H
+#define QPID_BROKER_PREVIEWSESSIONMANAGER_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 <qpid/framing/Uuid.h>
+#include <qpid/sys/Time.h>
+#include <qpid/sys/Mutex.h>
+#include <qpid/RefCounted.h>
+
+#include <set>
+#include <vector>
+#include <memory>
+
+#include <boost/noncopyable.hpp>
+#include <boost/ptr_container/ptr_vector.hpp>
+#include <boost/intrusive_ptr.hpp>
+
+namespace qpid {
+namespace broker {
+
+class PreviewSessionState;
+class PreviewSessionHandler;
+
+/**
+ * Create and manage PreviewSessionState objects.
+ */
+class PreviewSessionManager : private boost::noncopyable {
+  public:
+    /**
+     * Observer notified of PreviewSessionManager events.
+     */
+    struct Observer : public RefCounted {
+        virtual void opened(PreviewSessionState&) {}
+    };
+    
+    PreviewSessionManager(uint32_t ack);
+    
+    ~PreviewSessionManager();
+    
+    /** Open a new active session, caller takes ownership */
+    std::auto_ptr<PreviewSessionState> open(PreviewSessionHandler& c, uint32_t timeout_);
+    
+    /** Suspend a session, start it's timeout counter.
+     * The factory takes ownership.
+     */
+    void suspend(std::auto_ptr<PreviewSessionState> session);
+        
+    /** Resume a suspended session.
+     *@throw Exception if timed out or non-existant.
+     */
+    std::auto_ptr<PreviewSessionState> resume(const framing::Uuid&);
+
+    /** Add an Observer. */
+    void add(const boost::intrusive_ptr<Observer>&);
+    
+  private:
+    typedef boost::ptr_vector<PreviewSessionState> Suspended;
+    typedef std::set<framing::Uuid> Active;
+    typedef std::vector<boost::intrusive_ptr<Observer> > Observers;
+
+    void erase(const framing::Uuid&);             
+    void eraseExpired();             
+
+    sys::Mutex lock;
+    Suspended suspended;
+    Active active;
+    uint32_t ack;
+    Observers observers;
+    
+  friend class PreviewSessionState; // removes deleted sessions from active set.
+};
+
+
+
+}} // namespace qpid::broker
+
+
+
+
+
+#endif  /*!QPID_BROKER_PREVIEWSESSIONMANAGER_H*/