cluster::InitialStatusMap and unit tests, support for improved cluster join protocol.

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk/qpid@881420 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 68 insertions, 0 deletions

diff --git a/cpp/src/qpid/cluster/InitialStatusMap.h b/cpp/src/qpid/cluster/InitialStatusMap.h
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+#ifndef QPID_CLUSTER_INITIALSTATUSMAP_H
+#define QPID_CLUSTER_INITIALSTATUSMAP_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 "types.h"
+#include <qpid/framing/ClusterInitialStatusBody.h>
+#include <boost/optional.hpp>
+
+namespace qpid {
+namespace cluster {
+
+/**
+ * Track status of cluster members during initialization.
+ */
+class InitialStatusMap
+{
+  public:
+    typedef framing::ClusterInitialStatusBody Status;
+
+    InitialStatusMap(const MemberId& self);
+    /** Process a config change. @return true if we need to re-send our status */
+    void configChange(const MemberSet& newConfig);
+    /** @return true if we need to re-send status */
+    bool isResendNeeded();
+
+    /** Process received status */
+    void received(const MemberId&, const Status& is);
+
+    /**@return true if the map is complete. */
+    bool isComplete();
+    /**@pre isComplete. @return this node's elders */
+    MemberSet getElders();
+    /**@pre isComplete. @return True if we need an update. */
+    bool isUpdateNeeded();
+
+  private:
+    typedef std::map<MemberId, boost::optional<Status> > Map;
+    static bool notInitialized(const Map::value_type&);
+    static bool isActive(const Map::value_type&);
+    void check();
+    Map map;
+    MemberSet firstConfig;
+    MemberId self;
+    bool complete, updateNeeded, resendNeeded;
+};
+}} // namespace qpid::cluster
+
+#endif  /*!QPID_CLUSTER_INITIALSTATUSMAP_H*/