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, 110 insertions, 0 deletions

diff --git a/cpp/src/qpid/cluster/InitialStatusMap.cpp b/cpp/src/qpid/cluster/InitialStatusMap.cpp
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+++ b/cpp/src/qpid/cluster/InitialStatusMap.cpp
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+/*
+ *
+ * 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 "InitialStatusMap.h"
+#include <algorithm>
+#include <boost/bind.hpp>
+
+using namespace std;
+using namespace boost;
+
+namespace qpid {
+namespace cluster {
+
+InitialStatusMap::InitialStatusMap(const MemberId& self_)
+    : self(self_), complete(), updateNeeded(), resendNeeded()
+{
+    map[self] = optional<Status>();
+}
+
+void InitialStatusMap::configChange(const MemberSet& members) {
+    resendNeeded = false;
+    if (firstConfig.empty()) firstConfig = members;
+    MemberSet::const_iterator i = members.begin();
+    Map::iterator j = map.begin();
+    while (i != members.end() || j != map.end()) {
+        if (i == members.end()) { // j not in members, member left
+            Map::iterator k = j++;
+            map.erase(k);
+        }
+        else if (j == map.end()) { // i not in map, member joined
+            resendNeeded = true;
+            map[*i] = optional<Status>();
+            ++i;
+        }
+        else if (*i < j->first) { // i not in map, member joined
+            resendNeeded = true;
+            map[*i] = optional<Status>();
+            ++i;
+        }
+        else if (*i > j->first) { // j not in members, member left
+            Map::iterator k = j++;
+            map.erase(k);
+        }
+        else {
+            i++; j++;
+        }
+    }
+    if (resendNeeded) {         // Clear all status
+        for (Map::iterator i = map.begin(); i != map.end(); ++i)
+            i->second = optional<Status>();
+    }
+}
+
+void InitialStatusMap::received(const MemberId& m, const Status& s){
+    map[m] = s;
+}
+
+bool InitialStatusMap::notInitialized(const Map::value_type& v) {
+    return !v.second;
+}
+
+bool InitialStatusMap::isActive(const Map::value_type& v) {
+    return v.second && v.second->getActive();
+}
+
+bool InitialStatusMap::isComplete() {
+    return find_if(map.begin(), map.end(), &notInitialized) == map.end();
+}
+
+bool InitialStatusMap::isResendNeeded() {
+    bool ret = resendNeeded;
+    resendNeeded = false;
+    return ret;
+}
+
+bool InitialStatusMap::isUpdateNeeded() {
+    assert(isComplete());
+    // If there are any active members we need an update.
+    return find_if(map.begin(), map.end(), &isActive) != map.end();
+}
+
+MemberSet InitialStatusMap::getElders() {
+    assert(isComplete());
+    MemberSet elders;
+    // Elders are from first config change, active or higher node-id.
+    for (MemberSet::iterator i = firstConfig.begin(); i != firstConfig.end(); ++i) {
+        if (map.find(*i) != map.end() && (map[*i]->getActive() || *i > self))
+            elders.insert(*i);
+    }
+    return elders;
+}
+
+}} // namespace qpid::cluster