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foundationdb/fdbrpc/Replication.h

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/*
* Replication.h
*
* This source file is part of the FoundationDB open source project
*
* Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
*
* Licensed 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.
*/
#ifndef FLOW_REPLICATION_H
#define FLOW_REPLICATION_H
#pragma once
#include "flow/flow.h"
#include "fdbrpc/Locality.h"
#include "fdbrpc/ReplicationPolicy.h"
struct LocalitySet : public ReferenceCounted<LocalitySet> {
public:
LocalitySet(LocalitySet const& source):_entryArray(source._entryArray), _mutableEntryArray(source._mutableEntryArray), _keyValueArray(source._keyValueArray), _keyIndexArray(source._keyIndexArray), _cacheArray(source._cacheArray), _keymap(source._keymap), _localitygroup(source._localitygroup), _cachehits(source._cachehits), _cachemisses(source._cachemisses) {}
LocalitySet(LocalitySet& localityGroup):_localitygroup(&localityGroup), _keymap(new StringToIntMap()), _cachehits(0), _cachemisses(0) {}
virtual ~LocalitySet() {}
virtual void addref() { ReferenceCounted<LocalitySet>::addref(); }
virtual void delref() { ReferenceCounted<LocalitySet>::delref(); }
bool selectReplicas(
IRepPolicyRef const& policy,
std::vector<LocalityEntry> const& alsoServers,
std::vector<LocalityEntry> & results)
{
LocalitySetRef fromServers = LocalitySetRef::addRef(this);
return policy->selectReplicas(fromServers, alsoServers, results);
}
bool selectReplicas(
IRepPolicyRef const& policy,
std::vector<LocalityEntry> & results)
{ return selectReplicas(policy, std::vector<LocalityEntry>(), results); }
bool validate(
IRepPolicyRef const& policy) const
{
LocalitySetRef const solutionSet = LocalitySetRef::addRef((LocalitySet*) this);
return policy->validate(solutionSet);
}
virtual void clear() {
_entryArray.clear();
_mutableEntryArray.clear();
_keyValueArray.clear();
_keyIndexArray.clear();
_cacheArray.clear();
_keymap->clear();
}
LocalitySet & copy(LocalitySet const& source) {
_entryArray = source._entryArray;
_mutableEntryArray = source._mutableEntryArray;
_keyValueArray = source._keyValueArray;
_keyIndexArray = source._keyIndexArray;
_cacheArray = source._cacheArray;
_cachehits = source._cachehits;
_cachemisses = source._cachemisses;
_keymap = source._keymap;
_localitygroup = (LocalitySet*) source._localitygroup;
return *this;
}
LocalitySet & deep_copy(LocalitySet const& source) {
_entryArray = source._entryArray;
_mutableEntryArray = source._mutableEntryArray;
_keyValueArray = source._keyValueArray;
_keyIndexArray = source._keyIndexArray;
_cacheArray = source._cacheArray;
_cachehits = source._cachehits;
_cachemisses = source._cachemisses;
_keymap->copy(*source._keymap);
ASSERT(source._localitygroup == (LocalitySet*) source._localitygroup);
_localitygroup = (LocalitySet*) this;
return *this;
}
LocalityEntry const& getEntry(int localIndex) const {
ASSERT((localIndex >= 0) && (localIndex < _entryArray.size()));
return _entryArray[localIndex];
}
virtual Reference<LocalityRecord> const& getRecord(int localIndex) const {
return _localitygroup->getRecord(getEntry(localIndex)._id);
}
// Return record array to help debug the locality information for servers
virtual std::vector<Reference<LocalityRecord>> const& getRecordArray() const {
return _localitygroup->getRecordArray();
}
Reference<LocalityRecord> const& getRecordViaEntry(LocalityEntry localEntry) const {
return _localitygroup->getRecord(localEntry._id);
}
AttribKey getGroupKeyIndex(AttribKey indexKey) const
{ return _localitygroup->keyIndex(keyText(indexKey)); }
Optional<AttribValue> const getValue(int recordIndex, AttribKey const& indexKey) const
{ return getRecord(recordIndex)->getValue(getGroupKeyIndex(indexKey)); }
Optional<AttribValue> const getValueViaEntry(LocalityEntry recordEntry, AttribKey const& indexKey) const
{ return getRecordViaEntry(recordEntry)->getValue(getGroupKeyIndex(indexKey)); }
Optional<AttribValue> const getValueViaGroupKey(int recordIndex, AttribKey const& indexKey) const
{ return getRecord(recordIndex)->getValue(indexKey); }
Optional<AttribValue> const getValueViaGroupKey(LocalityEntry recordEntry, AttribKey const& indexKey) const
{ return getRecordViaEntry(recordEntry)->getValue(indexKey); }
std::vector<LocalityEntry> const& getEntries() const
{ return _entryArray; }
std::vector<LocalityEntry> const& getMutableEntries() const
{ return _mutableEntryArray; }
std::vector<LocalityEntry> const& getGroupEntries() const
{ return _localitygroup->_entryArray; }
std::string getLocalEntryInfo(int localIndex) const {
const AttribKey machineKey = keyIndex("zoneid");
auto& entry = getEntry(localIndex);
auto value = getValueViaEntry(entry, machineKey);
return format("(%3d) %-10s", entry._id, valueText(value.get()).c_str());
}
std::string getEntryInfo(LocalityEntry const& entry) const {
const AttribKey machineHash = keyIndex("zoneid");
auto value = getValueViaEntry(entry, machineHash);
return format("(%3d) %-10s", entry._id, value.present() ? valueText(value.get()).c_str() : "(unset)");
}
static void staticDisplayEntries(
LocalitySet const& localitySet,
std::vector<LocalityEntry> const& entryArray,
const char* name = "zone")
{
for (auto& entry : entryArray) {
printf(" %s: %s\n", name, localitySet.getEntryInfo(entry).c_str());
}
}
static void staticDisplayEntries(
LocalitySetRef const& fromServers,
std::vector<LocalityEntry> const& entryArray,
const char* name = "zone")
{
staticDisplayEntries(*fromServers, entryArray, name);
}
void DisplayEntries(const char* name = "zone") const {
staticDisplayEntries(*this, getEntries(), name);
}
// This function is used to create an subset containing all of the entries within
// the specified value for the given key
// The returned LocalitySet contains the LocalityRecords that have the same value as
// the indexValue under the same indexKey (e.g., zoneid)
LocalitySetRef restrict(AttribKey indexKey, AttribValue indexValue ) {
LocalitySetRef localitySet;
LocalityCacheRecord searchRecord(AttribRecord(indexKey, indexValue), localitySet);
auto itKeyValue = std::lower_bound(_cacheArray.begin(), _cacheArray.end(), searchRecord, LocalityCacheRecord::compareKeyValue);
if ((itKeyValue != _cacheArray.end()) && (itKeyValue->_attribute == searchRecord._attribute)) {
if (g_replicationdebug > 2) printf("Cache Hit: (%2d) %-5s => (%4d) %-10s %3d from %3lu items\n", indexKey._id, keyText(indexKey).c_str(), indexValue._id, valueText(indexValue).c_str(), itKeyValue->_resultset->size(), _entryArray.size());
_cachehits ++;
localitySet = itKeyValue->_resultset;
}
else {
localitySet = LocalitySetRef(new LocalitySet(*_localitygroup));
_cachemisses ++;
// If the key is not within the current key set, skip it because no items within
// the current entry array has the key
if (indexKey._id >= _keyIndexArray.size()) {
if (g_replicationdebug > 2) {
printf("invalid key index:%3d array:%3lu value: (%3d) %-10s\n", indexKey._id, _keyIndexArray.size(), indexValue._id, valueText(indexValue).c_str());
}
}
// Get the equivalent key index from the locality group
else {
auto& groupKeyIndex = _keyIndexArray[indexKey._id];
localitySet->_entryArray.reserve(_entryArray.size());
for (auto& entry : _entryArray) {
auto& record = getRecordViaEntry(entry);
if (record->isPresent(groupKeyIndex, indexValue)) {
localitySet->add(record, *this);
}
}
}
searchRecord._resultset = localitySet;
_cacheArray.insert(itKeyValue, searchRecord);
if (g_replicationdebug > 2) printf("Cache Miss: (%2d) %-5s => (%4d) %-10s %3d for %3lu items\n", indexKey._id, keyText(indexKey).c_str(), indexValue._id, valueText(indexValue).c_str(), localitySet->size(), _entryArray.size());
}
return localitySet;
}
// This function is used to create an subset containing the specified entries
LocalitySetRef restrict(std::vector<LocalityEntry> const& entryArray) {
LocalitySetRef localitySet(new LocalitySet(*_localitygroup));
for (auto& entry : entryArray) {
localitySet->add(getRecordViaEntry(entry), *this);
}
return localitySet;
}
// This function will append all of the entries matching
// the specified value for the given key
std::vector<LocalityEntry> & getMatches(
std::vector<LocalityEntry> & entryArray,
AttribKey const& indexKey,
AttribValue const& indexValue)
{
for (auto& entry : _entryArray) {
auto& record = getRecordViaEntry(entry);
if (record->isPresent(indexKey, indexValue)) {
entryArray.push_back(entry);
}
}
return entryArray;
}
// Return a random entry
LocalityEntry const& random() const
{ return _entryArray[g_random->randomInt(0, _entryArray.size())]; }
// Return a given number of random entries that are not within the
// specified exception array
bool random(
std::vector<LocalityEntry>& randomEntries,
std::vector<LocalityEntry> const& exceptionArray,
unsigned int nRandomItems)
{
bool bComplete = true;
int nItemsLeft = _mutableEntryArray.size();
int nExceptions = exceptionArray.size();
while (nRandomItems > 0)
{
if (nItemsLeft <= 0) {
bComplete = false;
break;
}
while (nItemsLeft > 0)
{
auto itemIndex = g_random->randomInt(0, nItemsLeft);
auto item = _mutableEntryArray[itemIndex];
nItemsLeft --;
// Move the item to the end of the array, if not the last
if (itemIndex < nItemsLeft) {
_mutableEntryArray[itemIndex] = _mutableEntryArray[nItemsLeft];
_mutableEntryArray[nItemsLeft] = item;
}
// Break, if item is not in exception list
if (std::find(exceptionArray.begin(), exceptionArray.end(), item) != exceptionArray.end()) {
// Break, if unable to fulfil the request
if (nItemsLeft <= 0) {
bComplete = false;
break;
}
}
else {
randomEntries.push_back(item);
nRandomItems --;
break;
}
}
}
return bComplete;
}
// Return a random value for a specific key
Optional<AttribValue> randomValue(AttribKey const& indexKey, std::vector<AttribValue>& usedArray) const
{
auto& valueArray = _keyValueArray[indexKey._id];
int usedValues = usedArray.size();
int checksLeft = valueArray.size();
int indexValue;
bool validValue;
AttribValue valueValue;
Optional<AttribValue> result;
while (checksLeft > 0) {
indexValue = g_random->randomInt(0, checksLeft);
valueValue = valueArray[indexValue];
validValue = true;
for (int usedLoop=0; usedLoop < usedValues; usedLoop ++) {
if (usedArray[usedLoop] == valueValue) {
validValue = false;
usedValues --;
if (usedLoop < usedValues-1) {
auto lastValue = usedArray[usedValues];
usedArray[usedValues] = valueValue;
usedArray[usedLoop] = lastValue;
break;
}
}
}
if (validValue) {
result = valueValue;
break;
}
checksLeft --;
if (indexValue < checksLeft) {
auto lastValue = usedArray[checksLeft];
usedArray[checksLeft] = valueValue;
usedArray[indexValue] = lastValue;
}
}
return result;
}
void cacheReport() const {
printf("Cache: size:%5lu mem:%7ldKb hits:%9llu misses:%9llu records:%5lu\n",
_cacheArray.size(), getMemoryUsed()/1024L, _cachehits, _cachemisses, _entryArray.size());
}
void clearCache() {
_cacheArray.clear();
}
AttribKey keyIndex(std::string const& value) const
{ return AttribKey(_keymap->convertString(value)); }
AttribKey keyIndex( char const* value) const
{ return keyIndex(std::string(value)); }
AttribKey keyIndex( StringRef const& value) const
{ return keyIndex(value.printable()); }
AttribKey keyIndex( Optional<Standalone<StringRef>> const& value) const
{ return keyIndex((value.present()) ? value.get().printable() : "<undefined>"); }
std::string keyText(AttribKey indexKey) const
{ return _keymap->lookupString(indexKey._id); }
std::string keyText(Optional<AttribKey> indexKey) const
{ return (indexKey.present()) ? keyText(indexKey.get()._id) : "<undefined>"; }
AttribValue valueIndex(std::string const& value) const
{ return AttribValue(getGroupValueMap()->convertString(value)); }
AttribValue valueIndex( char const* value) const
{ return valueIndex(std::string(value)); }
AttribValue valueIndex( StringRef const& value) const
{ return valueIndex(value.printable()); }
AttribValue valueIndex( Optional<Standalone<StringRef>> const& value) const
{ return valueIndex((value.present()) ? value.get().printable() : "<undefined>"); }
std::string valueText(AttribValue indexValue) const
{ return getGroupValueMap()->lookupString(indexValue._id); }
std::string valueText(Optional<AttribValue> indexValue) const
{ return (indexValue.present()) ? valueText(indexValue.get()._id) : "<undefined>"; }
int size() const { return _entryArray.size(); }
int empty() const { return _entryArray.empty(); }
virtual void swapMutableRecords(int recordIndex1, int recordIndex2) {
ASSERT((recordIndex1 >=0) && (recordIndex1 < _mutableEntryArray.size()));
ASSERT((recordIndex2 >=0) && (recordIndex2 < _mutableEntryArray.size()));
auto entry = _mutableEntryArray[recordIndex1];
_mutableEntryArray[recordIndex1] = _mutableEntryArray[recordIndex2];
_mutableEntryArray[recordIndex2] = entry;
}
virtual int getMemoryUsed() const {
int memorySize = sizeof(_entryArray) + sizeof(LocalityEntry) * _entryArray.capacity() + sizeof(_cacheArray) + sizeof(LocalityCacheRecord) * _cacheArray.capacity() + sizeof(_keyIndexArray) + sizeof(AttribKey) * _keyIndexArray.capacity() + sizeof(_cachehits) + sizeof(_cachemisses) + _keymap->getMemoryUsed();
for (auto& cacheRecord : _cacheArray) {
memorySize += cacheRecord.getMemoryUsed();
}
for (auto& valueArray : _keyValueArray) {
memorySize += sizeof(AttribValue) * valueArray.capacity();
}
return memorySize;
}
protected:
LocalityEntry const& add(LocalityEntry const& entry, LocalityData const& data) {
_entryArray.push_back(entry);
_mutableEntryArray.push_back(entry);
// Ensure that the key value array is large enough to hold the values
if (_keyValueArray.capacity() < _keyValueArray.size() + data._data.size()) {
_keyValueArray.reserve(_keyValueArray.size() + data._data.size());
}
for (auto& dataPair : data._data) {
auto indexKey = keyIndex(dataPair.first);
auto indexValue = valueIndex(dataPair.second);
if (indexKey._id >= _keyIndexArray.size()) {
_keyIndexArray.resize(indexKey._id+1);
_keyIndexArray[indexKey._id] = AttribKey(getGroupKeyMap()->convertString(dataPair.first));
}
if (indexKey._id >= _keyValueArray.size()) {
_keyValueArray.resize(indexKey._id+1);
}
auto& valueArray = _keyValueArray[indexKey._id];
auto lowerBound = std::lower_bound(valueArray.begin(), valueArray.end(), indexValue);
if ((lowerBound == valueArray.end()) || (*lowerBound != indexValue)) {
valueArray.insert(lowerBound, indexValue);
}
}
clearCache();
return _entryArray.back();
}
LocalityEntry const& add(Reference<LocalityRecord> const& record, LocalitySet const& localitySet) {
_entryArray.push_back(record->_entryIndex);
_mutableEntryArray.push_back(record->_entryIndex);
// Ensure that the key value array is large enough to hold the values
if (_keyValueArray.capacity() < _keyValueArray.size() + record->_dataMap->size()) {
_keyValueArray.reserve(_keyValueArray.size() + record->_dataMap->size());
}
for (auto& keyValuePair : record->_dataMap->_keyvaluearray) {
auto keyString = _localitygroup->keyText(keyValuePair.first);
auto indexKey = keyIndex(keyString);
auto& indexValue = keyValuePair.second;
if (indexKey._id >= _keyIndexArray.size()) {
_keyIndexArray.resize(indexKey._id+1);
_keyIndexArray[indexKey._id] = AttribKey(getGroupKeyMap()->convertString(keyString));
}
if (indexKey._id >= _keyValueArray.size()) {
_keyValueArray.resize(indexKey._id+1);
}
auto& valueArray = _keyValueArray[indexKey._id];
auto lowerBound = std::lower_bound(valueArray.begin(), valueArray.end(), indexValue);
if ((lowerBound == valueArray.end()) || (*lowerBound != indexValue)) {
valueArray.insert(lowerBound, indexValue);
}
}
clearCache();
return _entryArray.back();
}
// This class stores the cache record for each entry within the locality set
struct LocalityCacheRecord {
AttribRecord _attribute;
LocalitySetRef _resultset;
LocalityCacheRecord(AttribRecord const& attribute, LocalitySetRef resultset):_attribute(attribute),_resultset(resultset){}
LocalityCacheRecord(LocalityCacheRecord const& source):_attribute(source._attribute),_resultset(source._resultset){}
virtual ~LocalityCacheRecord(){}
LocalityCacheRecord& operator=(LocalityCacheRecord const& source) {
_attribute = source._attribute;
_resultset = source._resultset;
return *this;
}
int getMemoryUsed() const {
return sizeof(_attribute) + sizeof(_resultset) + _resultset->getMemoryUsed();
}
static bool compareKeyValue(const LocalityCacheRecord& lhs, const LocalityCacheRecord& rhs)
{ return (lhs._attribute.first < rhs._attribute.first) || (!(rhs._attribute.first < lhs._attribute.first) && (lhs._attribute.second < rhs._attribute.second)); }
static bool compareKey(const LocalityCacheRecord& lhs, const LocalityCacheRecord& rhs)
{ return (lhs._attribute.first < rhs._attribute.first); }
};
public:
virtual Reference<StringToIntMap> const& getGroupValueMap() const
{ return _localitygroup->getGroupValueMap(); }
virtual Reference<StringToIntMap> const& getGroupKeyMap() const
{ return _localitygroup->getGroupKeyMap(); }
protected:
virtual Reference<StringToIntMap>& getGroupValueMap()
{ return _localitygroup->getGroupValueMap(); }
virtual Reference<StringToIntMap>& getGroupKeyMap()
{ return _localitygroup->getGroupKeyMap(); }
protected:
std::vector<LocalityEntry> _entryArray;
std::vector<LocalityEntry> _mutableEntryArray; // Use to rearrange entries for fun
std::vector<std::vector<AttribValue>> _keyValueArray;
std::vector<AttribKey> _keyIndexArray;
std::vector<LocalityCacheRecord> _cacheArray;
Reference<StringToIntMap> _keymap;
LocalitySet* _localitygroup;
long long unsigned int _cachehits;
long long unsigned int _cachemisses;
};
struct LocalityGroup : public LocalitySet {
LocalityGroup():LocalitySet(*this), _valuemap(new StringToIntMap()) {}
LocalityGroup(LocalityGroup const& source):LocalitySet(source), _recordArray(source._recordArray), _valuemap(source._valuemap) {}
virtual ~LocalityGroup() { }
LocalityEntry const& add(LocalityData const& data) {
// _recordArray.size() is the new entry index for the new data
Reference<LocalityRecord> record(new LocalityRecord(convertToAttribMap(data), _recordArray.size()));
_recordArray.push_back(record);
return LocalitySet::add(record, *this);
}
virtual void clear() {
LocalitySet::clear();
_valuemap->clear();
_recordArray.clear();
}
LocalityGroup & copy(LocalityGroup const& source) {
LocalitySet::copy(source);
_valuemap = source._valuemap;
_recordArray = source._recordArray;
return *this;
}
LocalityGroup & deep_copy(LocalityGroup const& source) {
LocalitySet::deep_copy(source);
_valuemap->copy(*source._valuemap);
_recordArray = source._recordArray;
return *this;
}
virtual Reference<LocalityRecord> const& getRecord(int recordIndex) const {
ASSERT((recordIndex >= 0) && (recordIndex < _recordArray.size()));
return _recordArray[recordIndex];
}
// Get the locality info for debug purpose
virtual std::vector<Reference<LocalityRecord>> const& getRecordArray() const { return _recordArray; }
virtual int getMemoryUsed() const {
int memorySize = sizeof(_recordArray) + _keymap->getMemoryUsed();
for (auto& record : _recordArray) {
memorySize += record->getMemoryUsed();
}
return LocalitySet::getMemoryUsed() + memorySize;
}
// Convert locality data to sorted vector of int pairs
Reference<KeyValueMap> convertToAttribMap(LocalityData const& data) {
Reference<KeyValueMap> attribHashMap(new KeyValueMap);
for (auto& dataPair : data._data) {
auto indexKey = keyIndex(dataPair.first);
auto indexValue = valueIndex(dataPair.second);
attribHashMap->_keyvaluearray.push_back(AttribRecord(indexKey,indexValue));
}
// Sort the attribute array
std::sort(attribHashMap->_keyvaluearray.begin(), attribHashMap->_keyvaluearray.end(), KeyValueMap::compareKeyValue);
return attribHashMap;
}
virtual Reference<StringToIntMap> const& getGroupValueMap() const
{ return _valuemap; }
virtual Reference<StringToIntMap> const& getGroupKeyMap() const
{ return _keymap; }
protected:
virtual Reference<StringToIntMap> & getGroupValueMap()
{ return _valuemap; }
virtual Reference<StringToIntMap> & getGroupKeyMap()
{ return _keymap; }
protected:
std::vector<Reference<LocalityRecord>> _recordArray;
Reference<StringToIntMap> _valuemap;
};
template <class V>
struct LocalityMap : public LocalityGroup {
LocalityMap():LocalityGroup() {}
LocalityMap(LocalityMap const& source):LocalityGroup(source), _objectArray(source._objectArray) {}
virtual ~LocalityMap() {}
bool selectReplicas(
IRepPolicyRef const& policy,
std::vector<LocalityEntry> const& alsoServers,
std::vector<LocalityEntry>& entryResults,
std::vector<V*> & results)
{
bool result;
int entrySize = entryResults.size();
int extraSpace = results.capacity() - results.size();
if (extraSpace > 0) {
entryResults.reserve(entryResults.size() + extraSpace);
}
result = LocalityGroup::selectReplicas(policy, alsoServers, entryResults);
append(results, entryResults, entrySize);
return result;
}
bool selectReplicas(
IRepPolicyRef const& policy,
std::vector<LocalityEntry> const& alsoServers,
std::vector<V*> & results)
{
std::vector<LocalityEntry> entryResults;
return selectReplicas(policy, alsoServers, entryResults, results);
}
bool selectReplicas(
IRepPolicyRef const& policy,
std::vector<V*> & results)
{ return selectReplicas(policy, std::vector<LocalityEntry>(), results); }
void append(
std::vector<V*> & objects,
std::vector<LocalityEntry> const& entries,
int firstItem = 0) const
{
int newItems = entries.size() - firstItem;
if (newItems > 0)
objects.reserve(objects.size() + newItems + objects.size());
for (auto i=firstItem; i<entries.size(); i++) {
objects.push_back((V*)getObject(entries[i]));
}
}
LocalityEntry const& add(LocalityData const& data, V const* object) {
_objectArray.push_back(object);
return LocalityGroup::add(data);
}
V const* getObject(LocalityEntry const& recordEntry) const {
ASSERT((recordEntry._id >= 0) && (recordEntry._id < _objectArray.size()));
return _objectArray[recordEntry._id];
}
V const* getObject(LocalityRecord const& record) const {
return getObject(record._entryIndex);
}
V const* getObject(Reference<LocalityRecord> const& record) const {
return getObject(record->_entryIndex);
}
virtual void clear() {
LocalityGroup::clear();
_objectArray.clear();
}
virtual int getMemoryUsed() const {
return LocalitySet::getMemoryUsed() + sizeof(_objectArray) + (sizeof(V*) * _objectArray.size());
}
std::vector<V const*> const& getObjects() const
{ return _objectArray; }
protected:
std::vector<V const*> _objectArray;
};
#endif
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