public void accumulateFreeSlot(
TransactionalIdSystemImpl idSystem,
FreespaceCommitter freespaceCommitter,
boolean forFreespace) {
if (forFreespace() != forFreespace) {
return;
}
if (_firstOperation == SlotChangeOperation.create) {
return;
}
if (_currentOperation == SlotChangeOperation.update
|| _currentOperation == SlotChangeOperation.delete) {
Slot slot = modifiedSlotInParentIdSystem(idSystem);
if (Slot.isNull(slot)) {
slot = idSystem.committedSlot(_key);
}
// No old slot at all can be the case if the object
// has been deleted by another transaction and we add it again.
if (!Slot.isNull(slot)) {
freespaceCommitter.delayedFree(slot, freeToSystemFreespaceSystem());
}
}
}
protected void freePreviouslyModifiedSlot(FreespaceManager freespaceManager) {
if (Slot.isNull(_newSlot)) {
return;
}
free(freespaceManager, _newSlot);
_newSlot = null;
}
protected void free(FreespaceManager freespaceManager, Slot slot) {
if (slot.isNull()) {
return;
}
if (freespaceManager == null) {
return;
}
freespaceManager.free(slot);
}
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 ByteArrayBuffer readBufferBySlot(Slot slot) {
if (Slot.isNull(slot)) {
return null;
}
if (DTrace.enabled) {
DTrace.READ_SLOT.logLength(slot.address(), slot.length());
}
ByteArrayBuffer buffer = new ByteArrayBuffer(slot.length());
buffer.readEncrypt(this, slot.address());
return buffer;
}
public void free(Slot slot) {
if (slot.isNull()) {
return;
// TODO: This should really be an IllegalArgumentException but old database files
// with index-based FreespaceManagers appear to deliver zeroed slots.
// throw new IllegalArgumentException();
}
if (_freespaceManager == null) {
// Can happen on early free before freespacemanager
// is up, during conversion.
return;
}
if (DTrace.enabled) {
DTrace.FILE_FREE.logLength(slot.address(), slot.length());
}
_freespaceManager.free(slot);
}
public boolean isDeleted() {
return slotModified() && _newSlot.isNull();
}
private final boolean isFreeOnRollback() {
return !Slot.isNull(_newSlot);
}
