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diff --git a/qpid/cpp/src/qpid/cluster/Multicaster.h b/qpid/cpp/src/qpid/cluster/Multicaster.h
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+++ b/qpid/cpp/src/qpid/cluster/Multicaster.h
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+#ifndef QPID_CLUSTER_MULTICASTER_H
+#define QPID_CLUSTER_MULTICASTER_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/cluster/types.h"
+#include "qpid/cluster/Event.h"
+#include "qpid/sys/PollableQueue.h"
+#include "qpid/sys/Mutex.h"
+#include <boost/shared_ptr.hpp>
+#include <deque>
+
+namespace qpid {
+
+namespace sys {
+class Poller;
+}
+
+namespace cluster {
+
+class Cpg;
+
+/**
+ * Multicast to the cluster. Shared, thread safe object.
+ * 
+ * holding mode: Hold connection events for later multicast. Cluster
+ * events are never held.  Used during PRE_INIT/INIT state when we
+ * want to hold any connection traffic till we are read in the
+ * cluster.
+ *
+ * bypass mode: Multicast cluster events directly in the calling
+ * thread. This mode is used by cluster in PRE_INIT state the poller
+ * is not yet be active.
+ *
+ * Multicaster is created in bypass+holding mode, they are disabled by
+ * start and setReady respectively.
+ */
+class Multicaster
+{
+  public:
+    /** Starts in initializing mode. */
+    Multicaster(Cpg& cpg_,
+                const boost::shared_ptr<sys::Poller>&,
+                boost::function<void()> onError
+    );
+    void mcastControl(const framing::AMQBody& controlBody, const ConnectionId&);
+    void mcastControl(const framing::AMQFrame& controlFrame, const ConnectionId&);
+    void mcastBuffer(const char*, size_t, const ConnectionId&);
+    void mcast(const Event& e);
+
+    /** Start the pollable queue, turn off bypass mode. */
+    void start();
+    /** Switch to ready mode, release held messages. */
+    void setReady();
+
+  private:
+    typedef sys::PollableQueue<Event> PollableEventQueue;
+    typedef std::deque<Event> PlainEventQueue;
+
+    PollableEventQueue::Batch::const_iterator sendMcast(const PollableEventQueue::Batch& );
+
+    sys::Mutex lock;
+    boost::function<void()> onError;
+    Cpg& cpg;
+    PollableEventQueue queue;
+    bool ready;
+    PlainEventQueue holdingQueue;
+    std::vector<struct ::iovec> ioVector;
+    bool bypass;
+};
+}} // namespace qpid::cluster
+
+#endif  /*!QPID_CLUSTER_MULTICASTER_H*/