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Diffstat (limited to 'qpid/cpp/src/qpid/cluster/InitialStatusMap.cpp')
-rw-r--r-- | qpid/cpp/src/qpid/cluster/InitialStatusMap.cpp | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/qpid/cpp/src/qpid/cluster/InitialStatusMap.cpp b/qpid/cpp/src/qpid/cluster/InitialStatusMap.cpp new file mode 100644 index 0000000000..c8ecc13f2c --- /dev/null +++ b/qpid/cpp/src/qpid/cluster/InitialStatusMap.cpp @@ -0,0 +1,226 @@ +/* + * + * 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 "qpid/log/Statement.h" +#include <algorithm> +#include <vector> +#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 + firstConfig.erase(j->first); + 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 + firstConfig.erase(j->first); + 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() const { + return !map.empty() && find_if(map.begin(), map.end(), ¬Initialized) == map.end(); +} + +bool InitialStatusMap::transitionToComplete() { + return completed; +} + +bool InitialStatusMap::isResendNeeded() { + bool ret = resendNeeded; + resendNeeded = false; + return ret; +} + +bool InitialStatusMap::isActiveEntry(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::isActive() { + assert(isComplete()); + return (find_if(map.begin(), map.end(), &isActiveEntry) != map.end()); +} + +bool InitialStatusMap::isUpdateNeeded() { + assert(isComplete()); + // We need an update if there are any active members. + if (isActive()) 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() const { + assert(isComplete()); + MemberSet elders; + for (MemberSet::const_iterator i = firstConfig.begin(); i != firstConfig.end(); ++i) { + // *i is in my first config, so a potential elder. + if (*i == self) continue; // Not my own elder + Map::const_iterator j = map.find(*i); + assert(j != map.end()); + assert(j->second); + const Status& s = *j->second; + // If I'm not in i's first config then i is older than me. + // Otherwise we were born in the same configuration so use + // member ID to break the tie. + MemberSet iFirstConfig = decodeMemberSet(s.getFirstConfig()); + if (iFirstConfig.find(self) == iFirstConfig.end() || *i > self) + elders.insert(*i); + } + return elders; +} + +// Get cluster ID from an active member or the youngest newcomer. +Uuid InitialStatusMap::getClusterId() { + assert(isComplete()); + assert(!map.empty()); + Map::iterator i = find_if(map.begin(), map.end(), &isActiveEntry); + 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; + + bool initialCluster = !isActive(); + for (Map::iterator i = map.begin(); i != map.end(); ++i) { + assert(i->second); + 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."); + // Only need shutdownId to match if we are in an initially forming cluster. + if (initialCluster) + 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 (map.size() >= size) { + // All initial members are present. 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."); + } +} + +std::string InitialStatusMap::getFirstConfigStr() const { + assert(!firstConfig.empty()); + return encodeMemberSet(firstConfig); +} + +}} // namespace qpid::cluster |