void ABI_Collab_Import::_calculateCollisionSeqence(UT_sint32 iIncomingRemoteRev, const UT_UTF8String& sIncomingDocUUID, UT_sint32& iStart, UT_sint32& iEnd)
{
UT_DEBUGMSG(("ABI_Collab_Import::_calculateCollisionSeqence() - iIncomingRemoteRev: %d\n", iIncomingRemoteRev));
// initialization
iStart = -1;
iEnd = -1;
ABI_Collab_Export* pExport = m_pAbiCollab->getExport();
UT_return_if_fail(pExport);
const UT_GenericVector<ChangeAdjust *>* pExpAdjusts = pExport->getAdjusts();
UT_return_if_fail(pExpAdjusts);
// worst case: the whole outgoing changerecord stack is the collision sequence
iStart = 0;
iEnd = pExpAdjusts->getItemCount();
// scan back to find the changerecord in our export list the remote has seen,
// maybe we can narrow the collision sequence down
UT_sint32 i = 0;
for (i = pExpAdjusts->getItemCount()-1; i >= 0; i--)
{
ChangeAdjust * pChange = pExpAdjusts->getNthItem(i);
if (pChange)
{
UT_DEBUGMSG(("Looking at exported changerecord - rev: %d, pos: %d, length: %d adjust %d, queue pos: %d, orig uuid: %s\n",
pChange->getLocalRev(), pChange->getLocalPos(), pChange->getLocalLength(), pChange->getLocalAdjust(), i, pChange->getRemoteDocUUID().utf8_str()));
if (iIncomingRemoteRev >= pChange->getLocalRev())
{
UT_DEBUGMSG(("Found the changerecord the remote side has already seen (iIncomingRemoteRev = %d)\n", iIncomingRemoteRev));
// a new changerecord can't collide with a changerecord the
// remote side had already seen, hence the +1
iStart = i+1;
break;
}
}
else
{
UT_ASSERT_HARMLESS(UT_SHOULD_NOT_HAPPEN);
}
}
// now move upward, so we kill off the bottom where changes are from the same document as the incoming cr (you can not collide with your own cr's!)
for (; iStart < UT_sint32(pExpAdjusts->getItemCount()); iStart++)
{
ChangeAdjust * pChange = pExpAdjusts->getNthItem(iStart);
if (pChange->getRemoteDocUUID() != sIncomingDocUUID)
{
// not the same document anymore, we can stop
break;
}
else
{
UT_DEBUGMSG(("Killing off matching change: %d\n", iStart));
}
}
}
bool AbiCollab_ImportRuleSet::_isSaveInsert(const ChangeAdjust& ca, const AbstractChangeRecordSessionPacket& acrsp, UT_sint32 iRemotePosAdjust)
{
UT_return_val_if_fail(ca.m_pPacket, false);
// if the packets share the same insertion position, then there is nothing we can do
if (ca.getLocalPos() == acrsp.getPos())
return false;
// allowing overlapping deletions is _really_ tricky; for now, we just disallow it
if (ca.getLocalLength() <= 0 || acrsp.getLength() <= 0)
return false;
if (ca.m_pPacket->getClassType() != PCT_GlobSessionPacket && acrsp.getClassType() != PCT_GlobSessionPacket)
{
// overlapping inserts are just fine in the case of non-globs, as long as the start positions differ
return ca.getLocalPos() != (acrsp.getPos()+iRemotePosAdjust);
}
//
// if we get there, then at least one of the packets is a glob; this makes it a bit harder
//
// first, check that there are no 'delete' changerecords in the glob(s);
// as stated above, deletes are really tricky, so we just disallow those
if (ca.m_pPacket->getClassType() == PCT_GlobSessionPacket)
for (std::vector<SessionPacket*>::const_iterator cit = static_cast<const GlobSessionPacket*>(ca.m_pPacket)->getPackets().begin(); cit != static_cast<const GlobSessionPacket*>(ca.m_pPacket)->getPackets().end(); cit++)
if (AbstractChangeRecordSessionPacket::isInstanceOf(**cit) &&
static_cast<AbstractChangeRecordSessionPacket*>(*cit)->getAdjust() < 0)
return false;
if (acrsp.getClassType() == PCT_GlobSessionPacket)
for (std::vector<SessionPacket*>::const_iterator cit = static_cast<const GlobSessionPacket&>(acrsp).getPackets().begin(); cit != static_cast<const GlobSessionPacket&>(acrsp).getPackets().end(); cit++)
if (AbstractChangeRecordSessionPacket::isInstanceOf(**cit) &&
static_cast<AbstractChangeRecordSessionPacket*>(*cit)->getAdjust() < 0)
return false;
//
// TODO: allow globs/insertions that really don't touch eachother, caused by the fact that
// the 'first' insertion moves up the other packet's position
//
return false; // just to be on the save side
}
// returns true if the import can continue, false otherwise
bool ABI_Collab_Import::_handleCollision(UT_sint32 iIncomingRev, UT_sint32 iLocalRev, BuddyPtr pCollaborator)
{
UT_DEBUGMSG(("_handleCollision() - incoming rev %d collides against local rev %d!!!\n", iIncomingRev, iLocalRev));
UT_return_val_if_fail(pCollaborator, false);
if (m_pAbiCollab->isLocallyControlled())
{
UT_DEBUGMSG(("We're controlling this session, refusing this changerecord from %s!\n", pCollaborator->getDescription().utf8_str()));
// add this collaborator to our revert ack list, so we can ignore his packets
// until we get an acknoledgement that he has reverted his local, colliding changes
m_revertSet.push_back(std::make_pair(pCollaborator, iIncomingRev));
// send the revert command to the collaborator
RevertSessionPacket rsp(m_pAbiCollab->getSessionId(), m_pDoc->getOrigDocUUIDString(), iIncomingRev);
m_pAbiCollab->push(&rsp, pCollaborator);
return false;
}
else
{
UT_DEBUGMSG(("We're NOT controlling this session, reverting local changes and accepting changerecord!\n"));
ABI_Collab_Export* pExport = m_pAbiCollab->getExport();
UT_return_val_if_fail(pExport, false);
UT_GenericVector<ChangeAdjust *>* pAdjusts = pExport->getAdjusts();
UT_return_val_if_fail(pAdjusts, false);
m_pAbiCollab->setIsReverting(true); // mask all changes in the exporter
// undo our cool local changes, and nuke our exported packet list as well up to (and including) iLocalRev
for (UT_sint32 i = pAdjusts->getItemCount() - 1; i >= 0; i--)
{
ChangeAdjust* pChange = pAdjusts->getNthItem(i);
if (pChange)
{
if (pChange->getLocalRev() >= iLocalRev)
{
if (strcmp(m_pDoc->getOrigDocUUIDString(), pChange->getRemoteDocUUID().utf8_str()) == 0)
{
UT_DEBUGMSG(("UNDO-ING AND NUKING LOCAL CHANGE: EXPORT POSITION %d, pChange->m_iCRNumber: %d!\n", i, pChange->getLocalRev()));
// undo the change locally
m_pDoc->undoCmd(1);
// fix up the positions on the change stack
for (UT_sint32 j = i+1; j < pAdjusts->getItemCount(); j++)
{
ChangeAdjust* pC = pAdjusts->getNthItem(j);
if (pC)
{
UT_DEBUGMSG(("Looking at fixing up the position of change pos %d\n", j));
if (pChange->getLocalPos() < pC->getLocalPos())
{
UT_DEBUGMSG(("Adjusting change pos %d from m_iDocPos: %d to m_iDocPos: %d\n", j, pC->getLocalPos(), pC->getLocalPos() - pChange->getLocalAdjust()));
pC->setLocalPos(pC->getLocalPos() - pChange->getLocalAdjust());
}
else
{
UT_DEBUGMSG(("No need to adjust change pos %d\n", j));
}
}
else
{
UT_ASSERT_HARMLESS(UT_SHOULD_NOT_HAPPEN);
}
}
// kill off the item
pAdjusts->deleteNthItem(i);
delete pChange;
}
else
{
UT_DEBUGMSG(("Skipping undo of remote change\n"));
}
}
else
break;
}
else
{
UT_ASSERT_HARMLESS(UT_SHOULD_NOT_HAPPEN);
}
}
m_pAbiCollab->setIsReverting(false); // unmask all changes in the exporter
UT_DEBUGMSG(("Pre-Acknowledging revert of revision %d\n", iLocalRev));
// send the revert acknowledgement command to the session owner
RevertAckSessionPacket rasp(m_pAbiCollab->getSessionId(), m_pDoc->getOrigDocUUIDString(), iLocalRev);
m_pAbiCollab->push(&rasp, pCollaborator);
m_iAlreadyRevertedRevs.push_back(iLocalRev);
return true;
}
}
/*!
* Scan back through the CR's we've emitted since this remote CR was sent
* and see if any overlap this one.
* return true if there is a collision.
*/
bool ABI_Collab_Import::_checkForCollision(const AbstractChangeRecordSessionPacket& acrsp, UT_sint32& iRev, UT_sint32& iImportAdjustment)
{
UT_DEBUGMSG(("ABI_Collab_Import::_checkForCollision() - pos: %d, length: %d, UUID: %s, remoterev: %d\n",
acrsp.getPos(), acrsp.getLength(), acrsp.getDocUUID().utf8_str(), acrsp.getRemoteRev()));
ABI_Collab_Export* pExport = m_pAbiCollab->getExport();
UT_return_val_if_fail(pExport, false);
const UT_GenericVector<ChangeAdjust *>* pExpAdjusts = pExport->getAdjusts();
UT_return_val_if_fail(pExpAdjusts, false);
iImportAdjustment = 0;
// get the collision sequence (if any)
UT_sint32 iStart = 0;
UT_sint32 iEnd = 0;
_calculateCollisionSeqence(acrsp.getRemoteRev(), acrsp.getDocUUID(), iStart, iEnd);
UT_return_val_if_fail(iStart >= 0 && iEnd >= 0, false);
if (iStart == iEnd)
{
UT_DEBUGMSG(("Empty collision sequence, no possible collision\n"));
return false;
}
std::deque<int> incAdjs;
UT_sint32 iIncomingStateAdjust = _getIncomingAdjustmentForState(pExpAdjusts, iStart, iEnd, acrsp.getPos(), acrsp.getLength(), acrsp.getDocUUID(), incAdjs);
UT_DEBUGMSG(("IINCOMMINGSTATEADJUST: %d\n", iIncomingStateAdjust));
// Now scan forward and look for an overlap of the new changerecord with the collision sequence
UT_DEBUGMSG(("Checking collision sequence [%d..%d) for overlapping changerecords\n", iStart, iEnd));
bool bDenied = false;
for (UT_sint32 i = iStart; i < iEnd; i++)
{
ChangeAdjust* pChange = pExpAdjusts->getNthItem(i);
if (pChange)
{
UT_DEBUGMSG(("Looking at pChange->getRemoteDocUUID(): %s\n", pChange->getRemoteDocUUID().utf8_str()));
if (pChange->getRemoteDocUUID() != acrsp.getDocUUID())
{
if (_isOverlapping(acrsp.getPos()+iIncomingStateAdjust, acrsp.getLength(), pChange->getLocalPos(), pChange->getLocalLength()) &&
!AbiCollab_ImportRuleSet::isOverlapAllowed(*pChange, acrsp, iIncomingStateAdjust))
{
UT_DEBUGMSG(("Fatal overlap detected for incoming pos: %d, incoming length: %d, pChange->getLocalPos(): %d, pChange->getLocalLength(): %d\n",
acrsp.getPos(), acrsp.getLength(), pChange->getLocalPos(), pChange->getLocalLength()));
iRev = pChange->getLocalRev();
bDenied = true;
break;
}
else
{
UT_DEBUGMSG(("No (fatal) overlap detected for incoming pos: %d, incoming length: %d, pChange->getLocalPos(): %d, pChange->getLocalLength(): %d\n",
acrsp.getPos(), acrsp.getLength(), pChange->getLocalPos(), pChange->getLocalLength()));
}
if (pChange->getLocalPos() < acrsp.getPos()+iIncomingStateAdjust)
{
UT_DEBUGMSG(("Normal Upward influence detected\n"));
iIncomingStateAdjust += pChange->getLocalAdjust();
}
}
else
{
UT_DEBUGMSG(("Skipping overlap detection: changerecords came from the same document; incoming pos: %d, incoming length: %d, pChange->getLocalPos(): %d, pChange->getLocalLength(): %d\n",
acrsp.getPos(), acrsp.getLength(), pChange->getLocalPos(), pChange->getLocalLength()));
if (!incAdjs.empty())
{
iIncomingStateAdjust += incAdjs.front();
incAdjs.pop_front();
}
else
{
UT_ASSERT_HARMLESS(UT_SHOULD_NOT_HAPPEN);
}
}
UT_DEBUGMSG(("Now: iIncomingStateAdjust: %d\n", iIncomingStateAdjust));
}
else
UT_return_val_if_fail(false, false);
}
if (!bDenied && !incAdjs.empty())
{
UT_ASSERT_HARMLESS(UT_SHOULD_NOT_HAPPEN);
}
while (!incAdjs.empty())
{
UT_DEBUGMSG(("Adding left-over incoming adjustment: %d\n", incAdjs.front()));
iIncomingStateAdjust += incAdjs.front();
incAdjs.pop_front();
}
iImportAdjustment = iIncomingStateAdjust;
UT_DEBUGMSG(("Full import adjustment: %d\n", iImportAdjustment));
return bDenied;
}