Пример вложенных транзакций
Следующий пример включает три вложенных транзакции. Последовательность событий следует.
Создавать вложенные транзакции
1 Создают многоугольник и переносят это к базе данных.
2 Транзакция Начала 1:
3 Транзакция Начала 2: Вычтите цилиндр от вытеснения (создает отверстие в середине твердых).
4 Транзакция Начала 3:
5 Транзакции Начала 3 (снова): Сектор форма в половине по Y/Z плану и перемещению это по Y.
6 Конечных Транзакции 3.
7 Конечных Транзакции 2.
ОБРАТИТЕ ВНИМАНИЕ, прерываетесь ли Вы в этой точке, транзакции 2 и 3 оба отменены. Если Вы прерываете содержащую транзакцию, все вложенные транзакции прерваны, даже если они были успешно закончены.
8 Конечных Транзакции 1.
Следующее - код для этого примера:
void
transactCommand()
{
Adesk::Boolean interrupted;
Acad::ErrorStatus es = Acad::eOk;
AcDbObjectId savedCylinderId,savedExtrusionId;
// Create a poly and post it to the database.
//
acutPrintf("\nCreating a poly...Please supply the"
" required input.");
if ((es = createAndPostPoly()) != Acad::eOk)
return;
// Start a transaction.
//
AcTransaction *pTrans = actrTransactionManager->startTransaction();
assert(pTrans != NULL);
acutPrintf("\n\n###### Started transaction one." " ######\n");
// Select the poly and extrude it.
//
AcDbObject *pObj = NULL;
AsdkPoly *pPoly = NULL;
AcDb3dSolid *pSolid = NULL;
AcDbObjectId objId;
ads_name ename;
ads_point pickpt;
for (;;) {
switch (acedEntSel("\nSelect a polygon: ", ename, pickpt))
{
case RTNORM:
acdbGetObjectId(objId, ename);
if ((es = pTrans->getObject(pObj, objId, AcDb::kForRead)) != Acad::eOk)
{
acutPrintf("\nFailed to obtain an object"
" through transaction.");
actrTransactionManager->abortTransaction();
return;
}
assert(pObj != NULL);
pPoly = AsdkPoly::cast(pObj);
if (pPoly == NULL) {
acutPrintf("\nNot a polygon. Try again");
continue;
}
break;
case RTNONE:
case RTCAN:
actrTransactionManager->abortTransaction();
return;
default:
continue;
}
break;
}
// Now that a poly is created, convert it to a region
// and extrude it.
//
acutPrintf("\nWe will be extruding the poly.");
AcGePoint2d c2d = pPoly->center();
ads_point pt;
pt[0] = c2d[0]; pt[1] = c2d[1]; pt[2] = pPoly->elevation();
acdbEcs2Ucs(pt,pt,asDblArray(pPoly->normal()),Adesk::kFalse);
double height;
if (acedGetDist(pt, "\nEnter Extrusion height: ", &height) != RTNORM)
{
actrTransactionManager->abortTransaction();
return;
}
if ((es = extrudePoly(pPoly, height,savedExtrusionId)) != Acad::eOk) {
actrTransactionManager->abortTransaction();
return;
}
// Create a cylinder at the center of the polygon of
// the same height as the extruded poly.
//
double radius = (pPoly->startPoint() - pPoly->center()).length() * 0.5;
pSolid = new AcDb3dSolid;
assert(pSolid != NULL);
pSolid->createFrustum(height, radius, radius, radius);
AcGeMatrix3d mat(AcGeMatrix3d::translation(
pPoly->elevation()*pPoly->normal())*
AcGeMatrix3d::planeToWorld(pPoly->normal()));
pSolid->transformBy(mat);
// Move it up again by half the height along
// the normal.
//
AcGeVector3d x(1, 0, 0), y(0, 1, 0), z(0, 0, 1);
AcGePoint3d moveBy(pPoly->normal()[0] * height * 0.5,
pPoly->normal()[1] * height * 0.5,
pPoly->normal()[2] * height * 0.5);
mat.setCoordSystem(moveBy, x, y, z);
pSolid->transformBy(mat);
addToDb(pSolid, savedCylinderId);
actrTransactionManager->addNewlyCreatedDBRObject(pSolid);
pSolid->draw();
acutPrintf("\nCreated a cylinder at the center of"
" the poly.");
// Start another transaction. Ask the user to select
// the extruded solid followed by selecting the
// cylinder. Make a hole in the extruded solid by
// subtracting the cylinder from it.
//
pTrans = actrTransactionManager->startTransaction();
assert(pTrans != NULL);
acutPrintf("\n\n###### Started transaction two." " ######\n");
AcDb3dSolid *pExtrusion, *pCylinder;
if ((es = getASolid("\nSelect the extrusion: ", pTrans,
AcDb::kForWrite, savedExtrusionId, pExtrusion))
!= Acad::eOk)
{
actrTransactionManager->abortTransaction();
actrTransactionManager->abortTransaction();
return;
}
assert(pExtrusion != NULL);
if ((es = getASolid("\nSelect the cylinder: ", pTrans,
AcDb::kForWrite, savedCylinderId, pCylinder))
!= Acad::eOk)
{
actrTransactionManager->abortTransaction();
actrTransactionManager->abortTransaction();
return;
}
assert(pCylinder != NULL);
pExtrusion->booleanOper(AcDb::kBoolSubtract, pCylinder);
pExtrusion->draw();
acutPrintf("\nSubtracted the cylinder from the"
" extrusion.");
// At this point, the cylinder is a NULL solid. Erase it.
//
assert(pCylinder->isNull());
pCylinder->erase();
// Start another transaction and slice the resulting
// solid into two halves.
//
pTrans = actrTransactionManager->startTransaction();
assert(pTrans != NULL);
acutPrintf("\n\n##### Started transaction three."
" ######\n");
AcGeVector3d vec, normal;
AcGePoint3d sp,center;
pPoly->getStartPoint(sp);
pPoly->getCenter(center);
vec = sp - center;
normal = pPoly->normal().crossProduct(vec);
normal.normalize();
AcGePlane sectionPlane(center, normal);
AcDb3dSolid *pOtherHalf = NULL;
pExtrusion->getSlice(sectionPlane, Adesk::kTrue,
pOtherHalf);
assert(pOtherHalf != NULL);
// Move the other half three times the vector length
// along the vector.
//
moveBy.set(vec[0] * 3.0, vec[1] * 3.0, vec[2] * 3.0);
mat.setCoordSystem(moveBy, x, y, z);
pOtherHalf->transformBy(mat);
AcDbObjectId otherHalfId;
addToDb(pOtherHalf, otherHalfId);
actrTransactionManager->addNewlyCreatedDBRObject(pOtherHalf);
pOtherHalf->draw();
pExtrusion->draw();
acutPrintf("\ nSliced the resulting solid into half"
" and moved one piece.");
// Now abort transaction three, to return to the hole in
// the extrusion.
//
Adesk::Boolean yes = Adesk::kTrue;
if (getYOrN("\nLet’s abort transaction three, yes?"
" [Y] : ", Adesk::kTrue, yes,interrupted) == Acad::eOk
&& yes == Adesk::kTrue)
{
acutPrintf("\n\n$$$$$$ Aborting transaction"
" three. $$$$$$\n");
actrTransactionManager->abortTransaction();
acutPrintf("\nBack to the un-sliced solid.");
pExtrusion->draw();
char option[256];
acedGetKword("\nHit any key to continue.", option);
} else {
acutPrintf("\n\n>>>>>> Ending transaction three."
" <<<<<<\n");
actrTransactionManager->endTransaction();
}
// Start another transaction (three again). This time,
// slice the solid along a plane that is perpendicular
// to the plane we used last time: that is the slice
// we really wanted.
//
pTrans = actrTransactionManager->startTransaction();
assert(pTrans != NULL);
acutPrintf("\n\n##### Started transaction three."
" ######\n");
moveBy.set(normal[0] * 3.0, normal[1] * 3.0,
normal[2] * 3.0);
normal = vec;
normal.normalize();
sectionPlane.set(center, normal);
pOtherHalf = NULL;
pExtrusion->getSlice(sectionPlane, Adesk::kTrue,
pOtherHalf);
assert(pOtherHalf != NULL);
mat.setCoordSystem(moveBy, x, y, z);
pOtherHalf->transformBy(mat);
addToDb(pOtherHalf, otherHalfId);
actrTransactionManager
->addNewlyCreatedDBRObject(pOtherHalf);
pOtherHalf->draw();
pExtrusion->draw();
acutPrintf("\nSliced the resulting solid into half"
" along a plane");
acutPrintf("\ nperpendicular to the old one and moved"
" one piece.");
// Now, give the user the option to end all the transactions.
//
yes = Adesk::kFalse;
if (getYOrN("\nAbort transaction three? <No> : ",
Adesk::kFalse, yes,interrupted) == Acad::eOk
&& yes == Adesk::kTrue)
{
acutPrintf("\n\n$$$$$$ Aborting transaction"
" three. $$$$$$\n");
actrTransactionManager->abortTransaction();
acutPrintf("\nBack to the un-sliced solid.");
} else {
acutPrintf("\n\n>>>>>> Ending transaction three."
" <<<<<<\n");
actrTransactionManager->endTransaction();
}
yes = Adesk::kFalse;
if (getYOrN("\nAbort transaction two? <No> : ",
Adesk::kFalse, yes,interrupted) == Acad::eOk
&& yes == Adesk::kTrue)
{
acutPrintf("\n\n$$$$$$ Aborting transaction two."
" $$$$$$\n");
actrTransactionManager->abortTransaction();
acutPrintf("\nBack to separate extrusion and"
" cylinder.");
} else {
acutPrintf("\n\n>>>>>> Ending transaction two."
" <<<<<<\n");
actrTransactionManager->endTransaction();
}
yes = Adesk::kFalse;
if (getYOrN("\nAbort transaction one? <No> : ",
Adesk::kFalse, yes,interrupted) == Acad::eOk
&& yes == Adesk::kTrue)
{
acutPrintf("\n\n$$$$$$ Aborting transaction one."
" $$$$$$\n");
actrTransactionManager->abortTransaction();
acutPrintf("\nBack to just the Poly.");
} else {
actrTransactionManager->endTransaction();
acutPrintf("\n\n>>>>>> Ending transaction one."
" <<<<<<\n");
}
}
static Acad::ErrorStatus
createAndPostPoly()
{
int nSides = 0;
while (nSides < 3) {
acedInitGet(INP_NNEG, "");
switch (acedGetInt("\nEnter number of sides: ", &nSides))
{
case RTNORM:
if (nSides < 3)
acutPrintf("\nNeed at least 3 sides.");
break;
default:
return Acad::eInvalidInput;
}
}
ads_point center, startPt, normal;
if (acedGetPoint(NULL, "\nLocate center of polygon: ", center) != RTNORM)
{
return Acad::eInvalidInput;
}
startPt[0] = center[0];
startPt[1] = center[1];
startPt[2] = center[2];
while (asPnt3d(startPt) == asPnt3d(center)) {
switch (acedGetPoint(center, "\ nLocate start point of polygon: ", startPt)) {
case RTNORM:
if (asPnt3d(center) == asPnt3d(startPt))
acutPrintf("\nPick a point different"
" from the center.");
break;
default:
return Acad::eInvalidInput;
}
}
// Set the normal to the plane of the polygon to be
// the same as the Z direction of the current UCS,
// (0, 0, 1) since we also got the center and
// start point in the current UCS. (acedGetPoint()
// returns in the current UCS.)
normal[X] = 0.0;
normal[Y] = 0.0;
normal[Z] = 1.0;
acdbUcs2Wcs(normal, normal, Adesk::kTrue);
acdbUcs2Ecs(center, center, normal, Adesk::kFalse);
acdbUcs2Ecs(startPt, startPt, normal, Adesk::kFalse);
double elev = center[2];
AcGePoint2d cen = asPnt2d(center),
start = asPnt2d(startPt);
AcGeVector3d norm = asVec3d(normal);
AsdkPoly *pPoly = new AsdkPoly;
if (pPoly==NULL)
return Acad::eOutOfMemory;
Acad::ErrorStatus es;
if ((es=pPoly->set(cen, start, nSides, norm, "transactPoly",elev))!=Acad::eOk)
return es;
pPoly->setDatabaseDefaults( acdbHostApplicationServices()->workingDatabase());
postToDb(pPoly);
return Acad::eOk;
}
// Extrudes the poly to a given height.
//
static Acad::ErrorStatus
extrudePoly(AsdkPoly* pPoly, double height, AcDbObjectId& savedExtrusionId)
{
Acad::ErrorStatus es = Acad::eOk;
// Explode to a set of lines.
//
AcDbVoidPtrArray lines;
pPoly->explode(lines);
// Create a region from the set of lines.
//
AcDbVoidPtrArray regions;
AcDbRegion::createFromCurves(lines, regions);
assert(regions.length() == 1);
AcDbRegion *pRegion
= AcDbRegion::cast((AcRxObject*)regions[0]);
assert(pRegion != NULL);
// Extrude the region to create a solid.
//
AcDb3dSolid *pSolid = new AcDb3dSolid;
assert(pSolid != NULL);
pSolid->extrude(pRegion, height, 0.0);
for (int i = 0; i < lines.length(); i++) {
delete (AcRxObject*)lines[i];
}
for (i = 0; i < regions.length(); i++) {
delete (AcRxObject*)regions[i];
}
// Now we have a solid. Add it to database, then
// associate the solid with a transaction. After
// this, transaction management is in charge of
// maintaining it.
//
pSolid->setPropertiesFrom(pPoly);
addToDb(pSolid, savedExtrusionId);
actrTransactionManager->addNewlyCreatedDBRObject(pSolid);
pSolid->draw();
return Acad::eOk;
}
static Acad::ErrorStatus
getASolid(char* prompt,
AcTransaction* pTransaction,
AcDb::OpenMode mode,
AcDbObjectId checkWithThisId,
AcDb3dSolid*& pSolid)
{
AcDbObject *pObj = NULL;
AcDbObjectId objId;
ads_name ename;
ads_point pickpt;
for (;;) {
switch (acedEntSel(prompt, ename, pickpt)) {
case RTNORM:
AOK(acdbGetObjectId(objId, ename));
if (objId != checkWithThisId) {
acutPrintf("\n Select the proper"
" solid.");
continue;
}
AOK(pTransaction->getObject(pObj, objId, mode));
assert(pObj != NULL);
pSolid = AcDb3dSolid::cast(pObj);
if (pSolid == NULL) {
acutPrintf("\nNot a solid. Try again");
AOK(pObj->close());
continue;
}
break;
case RTNONE:
case RTCAN:
return Acad::eInvalidInput;
default:
continue;
}
break;
}
return Acad::eOk;
}
