// When a file gets opened, it uses the file size to determine where
// new slots can be appended. If this method would not be called, the
// freespace system could already contain a slot that points beyond
// the end of the file and this space could be allocated and used twice,
// for instance if a slot was allocated and freed without ever being
// written to file.
void ensureLastSlotWritten() {
if (!Debug4.xbytes) {
if (Deploy.overwrite) {
if (_blockEndAddress > _blockConverter.bytesToBlocks(fileLength())) {
StatefulBuffer writer =
createStatefulBuffer(systemTransaction(), _blockEndAddress - 1, blockSize());
writer.write();
}
}
}
}
public StatefulBuffer readStatefulBufferBySlot(Transaction trans, int id, Slot slot) {
if (Slot.isNull(slot)) {
return null;
}
if (DTrace.enabled) {
DTrace.READ_SLOT.logLength(slot.address(), slot.length());
}
StatefulBuffer buffer = createStatefulBuffer(trans, slot.address(), slot.length());
buffer.setID(id);
buffer.readEncrypt(this, slot.address());
return buffer;
}
public final boolean delete4(
Transaction transaction, ObjectReference ref, Object obj, int cascade, boolean userCall) {
int id = ref.getID();
StatefulBuffer reader = readStatefulBufferById(transaction, id);
if (reader != null) {
if (obj != null) {
if ((!showInternalClasses()) && Const4.CLASS_INTERNAL.isAssignableFrom(obj.getClass())) {
return false;
}
}
reader.setCascadeDeletes(cascade);
transaction.idSystem().notifySlotDeleted(id, SlotChangeFactory.USER_OBJECTS);
ClassMetadata classMetadata = ref.classMetadata();
classMetadata.delete(reader, obj);
return true;
}
return false;
}
