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diff --git a/cpp/src/qpid/cluster/Decoder.h b/cpp/src/qpid/cluster/Decoder.h
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+++ b/cpp/src/qpid/cluster/Decoder.h
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+#ifndef QPID_CLUSTER_DECODER_H
+#define QPID_CLUSTER_DECODER_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 "ConnectionDecoder.h"
+#include "types.h"
+#include <boost/ptr_container/ptr_map.hpp>
+
+namespace qpid {
+namespace cluster {
+
+class EventHeader;
+
+/**
+ * Holds a map of ConnectionDecoders. Decodes Events into EventFrames
+ * and forwards EventFrames to a handler.
+ *
+ * THREAD UNSAFE: Called sequentially with un-decoded cluster events from CPG.
+ */
+class Decoder
+{
+  public:
+    typedef boost::function<void(const EventFrame&)> Handler;
+
+    Decoder(const Handler& h);
+
+    /** Takes EventHeader + data rather than Event so that the caller can
+     * pass a pointer to connection data or a CPG buffer directly without copy.
+     */
+    void decode(const EventHeader& eh, const void* data);
+
+    /** Erase the decoder for a connection. */
+    void erase(const ConnectionId&);
+
+  private:
+    typedef boost::ptr_map<ConnectionId, ConnectionDecoder> Map;
+    Handler handler;
+    Map map;
+};
+}} // namespace qpid::cluster
+
+#endif  /*!QPID_CLUSTER_DECODER_H*/