/** INTERNAL: Begin the transaction on all child sessions. */
protected void basicBeginTransaction() throws DatabaseException {
for (Iterator sessionEnum = getSessionsByName().values().iterator(); sessionEnum.hasNext(); ) {
AbstractSession session = (AbstractSession) sessionEnum.next();
session.beginTransaction();
}
}
/**
* Return the next sequence value. First check the global pool, if empty then allocate new
* sequences locally.
*/
public Object getNextValue(Sequence sequence, AbstractSession writeSession) {
String seqName = sequence.getName();
if (sequence.getPreallocationSize() > 1) {
Queue sequencesForName = getPreallocationHandler().getPreallocated(seqName);
// First grab the first sequence value without locking, a lock is only required if empty.
Object sequenceValue = sequencesForName.poll();
if (sequenceValue != null) {
return sequenceValue;
}
// KeepLocked indicates whether the sequence lock should be kept for the whole duration of
// this method.
// Of course the lock should be released in any case when the method returns or throws an
// exception.
// This is only used if a sequence transaction was begun by the unit of work,
// and will be committed before the unit of work commit.
boolean keepLocked = false;
if (!getOwnerSession().getDatasourceLogin().shouldUseExternalTransactionController()
&& !writeSession.isInTransaction()) {
// To prevent several threads from simultaneously allocating a separate bunch of
// sequencing numbers each. With keepLocked==true the first thread locks out others
// until it copies the obtained sequence numbers to the global storage.
// Note that this optimization possible only in non-jts case when there is no transaction.
acquireLock(seqName);
try {
sequenceValue = sequencesForName.poll();
if (sequenceValue != null) {
return sequenceValue;
}
writeSession.beginTransaction(); // write accessor is set in begin
keepLocked = true;
} finally {
if (!keepLocked) {
releaseLock(seqName);
}
}
}
Accessor accessor;
Vector localSequencesForName;
if (!keepLocked) {
writeSession.beginTransaction(); // write accessor is set in begin
}
try {
accessor = writeSession.getAccessor();
SequencingCallbackImpl seqCallbackImpl = getCallbackImpl(writeSession, accessor);
Map localSequences = seqCallbackImpl.getPreallocatedSequenceValues();
localSequencesForName = (Vector) localSequences.get(seqName);
if ((localSequencesForName == null) || localSequencesForName.isEmpty()) {
localSequencesForName = sequence.getGeneratedVector(null, writeSession);
localSequences.put(seqName, localSequencesForName);
logDebugLocalPreallocation(writeSession, seqName, localSequencesForName, accessor);
}
} catch (RuntimeException ex) {
if (keepLocked) {
releaseLock(seqName);
}
try {
// make sure to rollback the transaction we've begun
writeSession.rollbackTransaction();
} catch (Exception rollbackException) {
// ignore rollback exception
}
// don't eat the original exception
throw ex;
}
try {
try {
// commitTransaction may copy preallocated sequence numbers
// from localSequences to preallocationHandler: that happens
// if it isn't a nested transaction, and sequencingCallback.afterCommit
// method has been called.
// In this case:
// 1. localSequences corresponding to the accessor
// has been removed from accessorToPreallocated;
// 2. All its members are empty (therefore localSequenceForName is empty).
writeSession.commitTransaction();
} catch (DatabaseException ex) {
try {
// make sure to rollback the transaction we've begun
writeSession.rollbackTransaction();
} catch (Exception rollbackException) {
// ignore rollback exception
}
// don't eat the original exception
throw ex;
}
if (!localSequencesForName.isEmpty()) {
// localSeqencesForName is not empty, that means
// sequencingCallback has not been called.
sequenceValue = localSequencesForName.remove(0);
return sequenceValue;
} else {
// localSeqencesForName is empty, that means
// sequencingCallback has been called.
sequenceValue = sequencesForName.poll();
if (sequenceValue != null) {
return sequenceValue;
}
return getNextValue(sequence, writeSession);
}
} finally {
if (keepLocked) {
releaseLock(seqName);
}
}
} else {
writeSession.beginTransaction();
try {
// preallocation size is 1 - just return the first (and only) element of the allocated
// vector.
Object sequenceValue = sequence.getGeneratedVector(null, writeSession).firstElement();
writeSession.commitTransaction();
return sequenceValue;
} catch (RuntimeException ex) {
try {
// make sure to rollback the transaction we've begun
writeSession.rollbackTransaction();
} catch (Exception rollbackException) {
// ignore rollback exception
}
// don't eat the original exception
throw ex;
}
}
}
/**
* INTERNAL: Perform the work to delete an object.
*
* @return object - the object being deleted.
*/
public Object executeDatabaseQuery() throws DatabaseException, OptimisticLockException {
AbstractSession session = getSession();
CommitManager commitManager = session.getCommitManager();
Object object = getObject();
boolean isUnitOfWork = session.isUnitOfWork();
try {
// Check if the object has already been committed, then no work is required
if (commitManager.isProcessedCommit(object)) {
return object;
}
commitManager.markPreModifyCommitInProgress(getObject());
if (!isUnitOfWork) {
session.beginTransaction();
}
ClassDescriptor descriptor = this.descriptor;
DescriptorEventManager eventManager = descriptor.getEventManager();
// PERF: Avoid events if no listeners.
if (eventManager.hasAnyEventListeners()) {
// Need to run pre-delete selector if available
eventManager.executeEvent(new DescriptorEvent(DescriptorEventManager.PreDeleteEvent, this));
}
// Verify if deep shallow modify is turned on
if (shouldCascadeParts()) {
descriptor.getQueryManager().preDelete(this);
}
// CR#2660080 missing aboutToDelete event.
// PERF: Avoid events if no listeners.
if (eventManager.hasAnyEventListeners()) {
DescriptorEvent event =
new DescriptorEvent(DescriptorEventManager.AboutToDeleteEvent, this);
event.setRecord(getModifyRow());
eventManager.executeEvent(event);
}
if (QueryMonitor.shouldMonitor()) {
QueryMonitor.incrementDelete(this);
}
int rowCount = 0;
// If the object was/will be deleted from a cascade delete constraint, ignore it.
if (isUnitOfWork
&& ((UnitOfWorkImpl) session).hasCascadeDeleteObjects()
&& ((UnitOfWorkImpl) session).getCascadeDeleteObjects().contains(object)) {
// Cascade delete does not check optimistic lock, assume ok.
rowCount = 1;
} else {
rowCount = getQueryMechanism().deleteObject().intValue();
}
if (rowCount < 1) {
if (session.hasEventManager()) {
session.getEventManager().noRowsModified(this, object);
}
}
if (descriptor.usesOptimisticLocking()) {
descriptor.getOptimisticLockingPolicy().validateDelete(rowCount, object, this);
}
commitManager.markPostModifyCommitInProgress(getObject());
// Verify if deep shallow modify is turned on
if (shouldCascadeParts()) {
descriptor.getQueryManager().postDelete(this);
}
if ((descriptor.getHistoryPolicy() != null)
&& descriptor.getHistoryPolicy().shouldHandleWrites()) {
descriptor.getHistoryPolicy().postDelete(this);
}
// PERF: Avoid events if no listeners.
if (eventManager.hasAnyEventListeners()) {
// Need to run post-delete selector if available
eventManager.executeEvent(
new DescriptorEvent(DescriptorEventManager.PostDeleteEvent, this));
}
if (!isUnitOfWork) {
session.commitTransaction();
}
commitManager.markCommitCompleted(object);
// CR3510313, avoid removing aggregate collections from cache (maintain cache is false).
if (shouldMaintainCache()) {
if (isUnitOfWork) {
((UnitOfWorkImpl) session).addObjectDeletedDuringCommit(object, descriptor);
} else {
session
.getIdentityMapAccessorInstance()
.removeFromIdentityMap(
getPrimaryKey(), descriptor.getJavaClass(), descriptor, object);
}
}
return object;
} catch (RuntimeException exception) {
if (!isUnitOfWork) {
session.rollbackTransaction();
}
commitManager.markCommitCompleted(object);
throw exception;
}
}
/**
* INTERNAL: Perform the work to delete an object.
*
* @return object - the object being deleted.
*/
public Object executeDatabaseQuery() throws DatabaseException, OptimisticLockException {
AbstractSession session = getSession();
CommitManager commitManager = session.getCommitManager();
Object object = getObject();
boolean isUnitOfWork = session.isUnitOfWork();
try {
// Check if the object has already been deleted, then no work is required.
if (commitManager.isCommitCompletedInPostOrIgnore(object)) {
return object;
}
ClassDescriptor descriptor = this.descriptor;
// Check whether the object is already being deleted,
// if it is, then there is a cycle, and the foreign keys must be nulled.
if (commitManager.isCommitInPreModify(object)) {
if (!commitManager.isShallowCommitted(object)) {
getQueryMechanism().updateForeignKeyFieldBeforeDelete();
if ((descriptor.getHistoryPolicy() != null)
&& descriptor.getHistoryPolicy().shouldHandleWrites()) {
descriptor.getHistoryPolicy().postUpdate(this);
}
commitManager.markShallowCommit(object);
}
return object;
}
commitManager.markPreModifyCommitInProgress(getObject());
if (!isUnitOfWork) {
session.beginTransaction();
}
DescriptorEventManager eventManager = descriptor.getEventManager();
// PERF: Avoid events if no listeners.
if (eventManager.hasAnyEventListeners()) {
// Need to run pre-delete selector if available
eventManager.executeEvent(new DescriptorEvent(DescriptorEventManager.PreDeleteEvent, this));
}
// Verify if deep shallow modify is turned on
if (shouldCascadeParts()) {
descriptor.getQueryManager().preDelete(this);
}
// Check for deletion dependencies.
if (isUnitOfWork) {
Set dependencies = ((UnitOfWorkImpl) session).getDeletionDependencies(object);
if (dependencies != null) {
for (Object dependency : dependencies) {
if (!commitManager.isCommitCompletedInPostOrIgnore(dependency)) {
ClassDescriptor dependencyDescriptor = session.getDescriptor(dependency);
// PERF: Get the descriptor query, to avoid extra query creation.
DeleteObjectQuery deleteQuery =
dependencyDescriptor.getQueryManager().getDeleteQuery();
if (deleteQuery == null) {
deleteQuery = new DeleteObjectQuery();
deleteQuery.setDescriptor(dependencyDescriptor);
} else {
// Ensure original query has been prepared.
deleteQuery.checkPrepare(session, deleteQuery.getTranslationRow());
deleteQuery = (DeleteObjectQuery) deleteQuery.clone();
}
deleteQuery.setIsExecutionClone(true);
deleteQuery.setObject(dependency);
session.executeQuery(deleteQuery);
}
}
}
}
// CR#2660080 missing aboutToDelete event.
// PERF: Avoid events if no listeners.
if (eventManager.hasAnyEventListeners()) {
DescriptorEvent event =
new DescriptorEvent(DescriptorEventManager.AboutToDeleteEvent, this);
event.setRecord(getModifyRow());
eventManager.executeEvent(event);
}
if (QueryMonitor.shouldMonitor()) {
QueryMonitor.incrementDelete(this);
}
int rowCount = 0;
// If the object was/will be deleted from a cascade delete constraint, ignore it.
if (isUnitOfWork
&& ((UnitOfWorkImpl) session).hasCascadeDeleteObjects()
&& ((UnitOfWorkImpl) session).getCascadeDeleteObjects().contains(object)) {
// Cascade delete does not check optimistic lock, assume ok.
rowCount = 1;
} else {
rowCount = getQueryMechanism().deleteObject().intValue();
}
if (rowCount < 1) {
if (session.hasEventManager()) {
session.getEventManager().noRowsModified(this, object);
}
}
if (this.usesOptimisticLocking) {
descriptor.getOptimisticLockingPolicy().validateDelete(rowCount, object, this);
}
commitManager.markPostModifyCommitInProgress(getObject());
// Verify if deep shallow modify is turned on
if (shouldCascadeParts()) {
descriptor.getQueryManager().postDelete(this);
}
if ((descriptor.getHistoryPolicy() != null)
&& descriptor.getHistoryPolicy().shouldHandleWrites()) {
descriptor.getHistoryPolicy().postDelete(this);
}
// PERF: Avoid events if no listeners.
if (eventManager.hasAnyEventListeners()) {
// Need to run post-delete selector if available
eventManager.executeEvent(
new DescriptorEvent(DescriptorEventManager.PostDeleteEvent, this));
}
if (!isUnitOfWork) {
session.commitTransaction();
}
commitManager.markCommitCompleted(object);
// CR3510313, avoid removing aggregate collections from cache (maintain cache is false).
if (shouldMaintainCache()) {
if (isUnitOfWork) {
((UnitOfWorkImpl) session).addObjectDeletedDuringCommit(object, descriptor);
} else {
session
.getIdentityMapAccessorInstance()
.removeFromIdentityMap(
getPrimaryKey(), descriptor.getJavaClass(), descriptor, object);
}
}
return object;
} catch (RuntimeException exception) {
if (!isUnitOfWork) {
session.rollbackTransaction();
}
commitManager.markCommitCompleted(object);
throw exception;
}
}