1 files changed, 197 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 "StoreStatus.h"
+#include <algorithm>
+#include <boost/bind.hpp>
+
+namespace qpid {
+namespace cluster {
+
+using namespace std;
+using namespace boost;
+using namespace framing::cluster;
+using namespace framing;
+
+InitialStatusMap::InitialStatusMap(const MemberId& self_, size_t size_)
+    : self(self_), completed(), resendNeeded(), size(size_)
+{}
+
+void InitialStatusMap::configChange(const MemberSet& members) {
+    resendNeeded = false;
+    bool wasComplete = isComplete();
+    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>();
+    }
+    completed = isComplete() && !wasComplete; // Set completed on the transition.
+}
+
+void InitialStatusMap::received(const MemberId& m, const Status& s){
+    bool wasComplete = isComplete();
+    map[m] = s;
+    completed = isComplete() && !wasComplete; // Set completed on the transition.
+}
+
+bool InitialStatusMap::notInitialized(const Map::value_type& v) {
+    return !v.second;
+}
+
+bool InitialStatusMap::isComplete() {
+    return !map.empty() && find_if(map.begin(), map.end(), &notInitialized) == map.end()
+        && (map.size() >= size);
+}
+
+bool InitialStatusMap::transitionToComplete() {
+    return completed;
+}
+
+bool InitialStatusMap::isResendNeeded() {
+    bool ret = resendNeeded;
+    resendNeeded = false;
+    return ret;
+}
+
+bool InitialStatusMap::isActive(const Map::value_type& v) {
+    return v.second && v.second->getActive();
+}
+
+bool InitialStatusMap::hasStore(const Map::value_type& v) {
+    return v.second &&
+        (v.second->getStoreState() == STORE_STATE_CLEAN_STORE ||
+         v.second->getStoreState() == STORE_STATE_DIRTY_STORE);
+}
+
+bool InitialStatusMap::isUpdateNeeded() {
+    assert(isComplete());
+    // We need an update if there are any active members.
+    if (find_if(map.begin(), map.end(), &isActive) != map.end()) return true;
+
+    // Otherwise it depends on store status, get my own status:
+    Map::iterator me = map.find(self);
+    assert(me != map.end());
+    assert(me->second);
+    switch (me->second->getStoreState()) {
+      case STORE_STATE_NO_STORE:
+      case STORE_STATE_EMPTY_STORE:
+        // If anybody has a store then we need an update.
+        return find_if(map.begin(), map.end(), &hasStore) != map.end();
+      case STORE_STATE_DIRTY_STORE: return true; 
+      case STORE_STATE_CLEAN_STORE: return false; // Use our own store
+    }
+    return false;
+}
+
+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;
+}
+
+// Get cluster ID from an active member or the youngest newcomer.
+framing::Uuid InitialStatusMap::getClusterId() {
+    assert(isComplete());
+    assert(!map.empty());
+    Map::iterator i = find_if(map.begin(), map.end(), &isActive);
+    if (i != map.end())
+        return i->second->getClusterId(); // An active member
+    else
+        return map.begin()->second->getClusterId(); // Youngest newcomer in node-id order
+}
+
+void checkId(Uuid& expect, const Uuid& actual, const string& msg) {
+    if (!expect) expect = actual;
+    assert(expect);
+    if (expect != actual)
+        throw Exception(msg);
+}
+
+void InitialStatusMap::checkConsistent() {
+    assert(isComplete());
+    int clean = 0;
+    int dirty = 0;
+    int empty = 0;
+    int none = 0;
+    int active = 0;
+    Uuid clusterId;
+    Uuid shutdownId;
+
+    for (Map::iterator i = map.begin(); i != map.end(); ++i) {
+        if (i->second->getActive()) ++active;
+        switch (i->second->getStoreState()) {
+          case STORE_STATE_NO_STORE: ++none; break;
+          case STORE_STATE_EMPTY_STORE: ++empty; break;
+          case STORE_STATE_DIRTY_STORE:
+            ++dirty;
+            checkId(clusterId, i->second->getClusterId(),
+                    "Cluster-ID mismatch. Stores belong to different clusters.");
+            break;
+          case STORE_STATE_CLEAN_STORE:
+            ++clean;
+            checkId(clusterId, i->second->getClusterId(),
+                    "Cluster-ID mismatch. Stores belong to different clusters.");
+            checkId(shutdownId, i->second->getShutdownId(),
+                    "Shutdown-ID mismatch. Stores were not shut down together");
+            break;
+        }
+    }
+    // Can't mix transient and persistent members.
+    if (none && (clean+dirty+empty))
+        throw Exception("Mixing transient and persistent brokers in a cluster");
+    // If there are no active members and there are dirty stores there
+    // must be at least one clean store.
+    if (!active && dirty && !clean)
+        throw Exception("Cannot recover, no clean store");
+}
+
+
+}} // namespace qpid::cluster