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diff --git a/qpid/cpp/src/qpid/cluster/exp/Core.h b/qpid/cpp/src/qpid/cluster/exp/Core.h
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+++ b/qpid/cpp/src/qpid/cluster/exp/Core.h
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+#ifndef QPID_CLUSTER_CORE_H
+#define QPID_CLUSTER_CORE_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 <string>
+#include <memory>
+#include "LockedMap.h"
+#include "qpid/cluster/types.h"
+#include "qpid/cluster/Cpg.h"
+#include "qpid/broker/QueuedMessage.h"
+
+// TODO aconway 2010-10-19: experimental cluster code.
+
+namespace qpid {
+
+namespace framing{
+class AMQBody;
+}
+
+namespace broker {
+class Broker;
+}
+
+namespace cluster {
+class EventHandler;
+class BrokerHandler;
+
+/**
+ * Cluster core state machine.
+ * Holds together the various objects that implement cluster behavior,
+ * and holds state that is shared by multiple components.
+ *
+ * Thread safe: called from broker connection threads and CPG dispatch threads.
+ */
+class Core
+{
+  public:
+    /** Configuration settings */
+    struct Settings {
+        std::string name;
+    };
+
+    typedef LockedMap<RoutingId, boost::intrusive_ptr<broker::Message> > RoutingMap;
+
+    /** Constructed during Plugin::earlyInitialize() */
+    Core(const Settings&, broker::Broker&);
+
+    /** Called during Plugin::initialize() */
+    void initialize();
+
+    /** Shut down broker due to fatal error. Caller should log a critical message */
+    void fatal();
+
+    /** Multicast an event */
+    void mcast(const framing::AMQBody&);
+
+    broker::Broker& getBroker() { return broker; }
+    EventHandler& getEventHandler() { return *eventHandler; }
+    BrokerHandler& getBrokerHandler() { return *brokerHandler; }
+
+    /** Map of messages that are currently being routed.
+     * Used to pass messages being routed from BrokerHandler to MessageHandler
+     */
+    RoutingMap& getRoutingMap() { return routingMap; }
+  private:
+    broker::Broker& broker;
+    std::auto_ptr<EventHandler> eventHandler; // Handles CPG events.
+    BrokerHandler* brokerHandler; // Handles broker events.
+    RoutingMap routingMap;
+};
+}} // namespace qpid::cluster
+
+#endif  /*!QPID_CLUSTER_CORE_H*/