void
TopicManagerImpl::getContent(LogUpdate& llu, TopicContentSeq& content)
{
{
Lock sync(*this);
reap();
}
DatabaseConnectionPtr connection = _connectionPool->newConnection();
for(;;)
{
try
{
content.clear();
for(map<string, TopicImplPtr>::const_iterator p = _topics.begin(); p != _topics.end(); ++p)
{
TopicContent rec = p->second->getContent();
content.push_back(rec);
}
LLUWrapperPtr lluWrapper = _connectionPool->getLLU(connection);
llu = lluWrapper->get();
break;
}
catch(const DeadlockException&)
{
continue;
}
catch(const DatabaseException& ex)
{
halt(_instance->communicator(), ex);
}
}
}
void
TopicManagerImpl::getContent(LogUpdate& llu, TopicContentSeq& content)
{
{
Lock sync(*this);
reap();
}
try
{
content.clear();
for(map<string, TopicImplPtr>::const_iterator p = _topics.begin(); p != _topics.end(); ++p)
{
TopicContent rec = p->second->getContent();
content.push_back(rec);
}
IceDB::ReadOnlyTxn txn(_instance->dbEnv());
_lluMap.get(txn, lluDbKey, llu);
}
catch(const IceDB::LMDBException& ex)
{
logError(_instance->communicator(), ex);
throw; // will become UnknownException in caller
}
}
void
TopicManagerImpl::initMaster(const set<GroupNodeInfo>& slaves, const LogUpdate& llu)
{
Lock sync(*this);
reap();
TopicContentSeq content;
// Update the database llu. This prevents the following case:
//
// Three replicas 1, 2, 3. 3 is the master. It accepts a change
// (say A=10, old value 9), writes to disk and then crashes. Now 2
// becomes the master. The client can ask this master for A and it
// returns 9. Now 3 comes back online, it has the last database
// state, so it syncs this state with 1, 2. The client will now
// magically get A==10. The solution here is when a new master is
// elected and gets the latest database state it immediately
// updates the llu stamp.
//
for(;;)
{
try
{
content.clear();
DatabaseConnectionPtr connection = _connectionPool->newConnection();
TransactionHolder txn(connection);
for(map<string, TopicImplPtr>::const_iterator p = _topics.begin(); p != _topics.end(); ++p)
{
TopicContent rec = p->second->getContent();
content.push_back(rec);
}
LLUWrapperPtr lluWrapper = _connectionPool->getLLU(connection);
lluWrapper->put(llu);
txn.commit();
break;
}
catch(const DeadlockException&)
{
continue;
}
catch(const DatabaseException& ex)
{
halt(_instance->communicator(), ex);
}
}
// Now initialize the observers.
_instance->observers()->init(slaves, llu, content);
}
void
TopicManagerImpl::initMaster(const set<GroupNodeInfo>& slaves, const LogUpdate& llu)
{
Lock sync(*this);
reap();
TopicContentSeq content;
// Update the database llu. This prevents the following case:
//
// Three replicas 1, 2, 3. 3 is the master. It accepts a change
// (say A=10, old value 9), writes to disk and then crashes. Now 2
// becomes the master. The client can ask this master for A and it
// returns 9. Now 3 comes back online, it has the last database
// state, so it syncs this state with 1, 2. The client will now
// magically get A==10. The solution here is when a new master is
// elected and gets the latest database state it immediately
// updates the llu stamp.
//
try
{
content.clear();
IceDB::ReadWriteTxn txn(_instance->dbEnv());
for(map<string, TopicImplPtr>::const_iterator p = _topics.begin(); p != _topics.end(); ++p)
{
TopicContent rec = p->second->getContent();
content.push_back(rec);
}
_lluMap.put(txn, lluDbKey, llu);
txn.commit();
}
catch(const IceDB::LMDBException& ex)
{
logError(_instance->communicator(), ex);
throw; // will become UnknownException in caller
}
// Now initialize the observers.
_instance->observers()->init(slaves, llu, content);
}
void
TopicManagerImpl::observerInit(const LogUpdate& llu, const TopicContentSeq& content)
{
Lock sync(*this);
TraceLevelsPtr traceLevels = _instance->traceLevels();
if(traceLevels->topicMgr > 0)
{
Ice::Trace out(traceLevels->logger, traceLevels->topicMgrCat);
out << "init";
for(TopicContentSeq::const_iterator p = content.begin(); p != content.end(); ++p)
{
out << " topic: " << _instance->communicator()->identityToString(p->id) << " subscribers: ";
for(SubscriberRecordSeq::const_iterator q = p->records.begin(); q != p->records.end(); ++q)
{
if(q != p->records.begin())
{
out << ",";
}
out << _instance->communicator()->identityToString(q->id);
if(traceLevels->topicMgr > 1)
{
out << " endpoints: " << IceStormInternal::describeEndpoints(q->obj);
}
}
}
}
// First we update the database state, and then we update our
// internal state.
for(;;)
{
try
{
DatabaseConnectionPtr connection = _connectionPool->newConnection();
TransactionHolder txn(connection);
LLUWrapperPtr lluWrapper = _connectionPool->getLLU(connection);
lluWrapper->put(llu);
SubscribersWrapperPtr subscribersWrapper = _connectionPool->getSubscribers(connection);
subscribersWrapper->clear();
for(TopicContentSeq::const_iterator p = content.begin(); p != content.end(); ++p)
{
SubscriberRecordKey key;
key.topic = p->id;
SubscriberRecord rec;
rec.link = false;
rec.cost = 0;
subscribersWrapper->put(key, rec);
for(SubscriberRecordSeq::const_iterator q = p->records.begin(); q != p->records.end(); ++q)
{
SubscriberRecordKey key;
key.topic = p->id;
key.id = q->id;
subscribersWrapper->put(key, *q);
}
}
txn.commit();
break;
}
catch(const DeadlockException&)
{
continue;
}
catch(const DatabaseException& ex)
{
halt(_instance->communicator(), ex);
}
}
// We do this with two scans. The first runs through the topics
// that we have and removes those not in the init list. The second
// runs through the init list and either adds the ones that don't
// exist, or updates those that do.
map<string, TopicImplPtr>::iterator p = _topics.begin();
while(p != _topics.end())
{
TopicContentSeq::const_iterator q;
for(q = content.begin(); q != content.end(); ++q)
{
if(q->id == p->second->id())
{
break;
}
}
if(q == content.end())
{
// Note that this destroy should not remove anything from
// the database since we've already synced up the db
// state.
//
// TODO: We could short circuit the database operations in
// the topic by calling a third form of destroy.
p->second->observerDestroyTopic(llu);
_topics.erase(p++);
}
else
{
++p;
}
}
// Now run through the contents updating the topics that do exist,
// and creating those that do not.
for(TopicContentSeq::const_iterator q = content.begin(); q != content.end(); ++q)
{
string name = identityToTopicName(q->id);
map<string, TopicImplPtr>::const_iterator p = _topics.find(name);
if(p == _topics.end())
{
installTopic(name, q->id, true, q->records);
}
else
{
p->second->update(q->records);
}
}
// Clear the set of observers.
_instance->observers()->clear();
}
void
TopicManagerImpl::observerInit(const LogUpdate& llu, const TopicContentSeq& content)
{
Lock sync(*this);
TraceLevelsPtr traceLevels = _instance->traceLevels();
if(traceLevels->topicMgr > 0)
{
Ice::Trace out(traceLevels->logger, traceLevels->topicMgrCat);
out << "init";
for(TopicContentSeq::const_iterator p = content.begin(); p != content.end(); ++p)
{
out << " topic: " << _instance->communicator()->identityToString(p->id) << " subscribers: ";
for(SubscriberRecordSeq::const_iterator q = p->records.begin(); q != p->records.end(); ++q)
{
if(q != p->records.begin())
{
out << ",";
}
out << _instance->communicator()->identityToString(q->id);
if(traceLevels->topicMgr > 1)
{
out << " endpoints: " << IceStormInternal::describeEndpoints(q->obj);
}
}
}
}
// First we update the database state, and then we update our
// internal state.
try
{
IceDB::ReadWriteTxn txn(_instance->dbEnv());
_lluMap.put(txn, lluDbKey, llu);
_subscriberMap.clear(txn);
for(TopicContentSeq::const_iterator p = content.begin(); p != content.end(); ++p)
{
SubscriberRecordKey key;
key.topic = p->id;
SubscriberRecord rec;
rec.link = false;
rec.cost = 0;
_subscriberMap.put(txn, key, rec);
for(SubscriberRecordSeq::const_iterator q = p->records.begin(); q != p->records.end(); ++q)
{
SubscriberRecordKey key;
key.topic = p->id;
key.id = q->id;
_subscriberMap.put(txn, key, *q);
}
}
txn.commit();
}
catch(const IceDB::LMDBException& ex)
{
logError(_instance->communicator(), ex);
throw; // will become UnknownException in caller
}
// We do this with two scans. The first runs through the topics
// that we have and removes those not in the init list. The second
// runs through the init list and either adds the ones that don't
// exist, or updates those that do.
map<string, TopicImplPtr>::iterator p = _topics.begin();
while(p != _topics.end())
{
TopicContentSeq::const_iterator q;
for(q = content.begin(); q != content.end(); ++q)
{
if(q->id == p->second->id())
{
break;
}
}
if(q == content.end())
{
// Note that this destroy should not remove anything from
// the database since we've already synced up the db
// state.
//
// TODO: We could short circuit the database operations in
// the topic by calling a third form of destroy.
p->second->observerDestroyTopic(llu);
_topics.erase(p++);
}
else
{
++p;
}
}
// Now run through the contents updating the topics that do exist,
// and creating those that do not.
for(TopicContentSeq::const_iterator q = content.begin(); q != content.end(); ++q)
{
string name = identityToTopicName(q->id);
map<string, TopicImplPtr>::const_iterator p = _topics.find(name);
if(p == _topics.end())
{
installTopic(name, q->id, true, q->records);
}
else
{
p->second->update(q->records);
}
}
// Clear the set of observers.
_instance->observers()->clear();
}
