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diff --git a/qpid/cpp/src/qpid/cluster/ErrorCheck.h b/qpid/cpp/src/qpid/cluster/ErrorCheck.h
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+++ b/qpid/cpp/src/qpid/cluster/ErrorCheck.h
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+#ifndef QPID_CLUSTER_ERRORCHECK_H
+#define QPID_CLUSTER_ERRORCHECK_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/MemberSet.h"
+#include "qpid/cluster/Multicaster.h"
+#include "qpid/framing/enum.h"
+#include "qpid/framing/SequenceNumber.h"
+#include <boost/function.hpp>
+#include <deque>
+#include <set>
+
+namespace qpid {
+namespace cluster {
+
+struct EventFrame;
+class Cluster;
+class Multicaster;
+class Connection;
+
+/**
+ * Error checking logic.
+ * 
+ * When an error occurs queue up frames until we can determine if all
+ * nodes experienced the error. If not, we shut down.
+ */
+class ErrorCheck
+{
+  public:
+    typedef framing::cluster::ErrorType ErrorType;
+    typedef framing::SequenceNumber SequenceNumber;
+    
+    ErrorCheck(Cluster&);
+
+    /** A local error has occured */
+    void error(Connection&, ErrorType, SequenceNumber frameSeq, const MemberSet&,
+               const std::string& msg);
+
+    /** Called when a frame is delivered */
+    void delivered(const EventFrame&);
+
+    /**@pre canProcess **/
+    EventFrame getNext();
+
+    bool canProcess() const { return type == NONE && !frames.empty(); }
+
+    bool isUnresolved() const { return type != NONE; }
+
+    /** Respond to an error check saying we had no error. */
+    void respondNone(const MemberId&, uint8_t type, SequenceNumber frameSeq);
+    
+  private:
+    static const ErrorType NONE = framing::cluster::ERROR_TYPE_NONE;
+    typedef std::deque<EventFrame>  FrameQueue;
+    FrameQueue::iterator review(const FrameQueue::iterator&);
+    void checkResolved();
+    
+    Cluster& cluster;
+    Multicaster& mcast;
+    FrameQueue frames;
+    MemberSet unresolved;
+    SequenceNumber frameSeq;
+    ErrorType type;
+    Connection* connection;
+    std::string message;
+};
+
+}} // namespace qpid::cluster
+
+#endif  /*!QPID_CLUSTER_ERRORCHECK_H*/