public Slot allocateSlot(int length) {
if (length <= 0) {
throw new IllegalArgumentException();
}
if (_freespaceManager != null && _freespaceManager.isStarted()) {
Slot slot = _freespaceManager.allocateSlot(length);
if (slot != null) {
if (DTrace.enabled) {
DTrace.GET_SLOT.logLength(slot.address(), slot.length());
}
return slot;
}
while (growDatabaseByConfiguredSize()) {
slot = _freespaceManager.allocateSlot(length);
if (slot != null) {
if (DTrace.enabled) {
DTrace.GET_SLOT.logLength(slot.address(), slot.length());
}
return slot;
}
}
}
Slot appendedSlot = appendBytes(length);
if (DTrace.enabled) {
DTrace.GET_SLOT.logLength(appendedSlot.address(), appendedSlot.length());
}
return appendedSlot;
}
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 write(ByteArrayBuffer writer) {
if (slotModified()) {
writer.writeInt(_key);
writer.writeInt(_newSlot.address());
writer.writeInt(_newSlot.length());
}
}
public void writePointer(int id, Slot slot) {
if (DTrace.enabled) {
DTrace.WRITE_POINTER.log(id);
DTrace.WRITE_POINTER.logLength(slot);
}
_pointerIo.seek(0);
if (Deploy.debug) {
_pointerIo.writeBegin(Const4.YAPPOINTER);
}
_pointerIo.writeInt(slot.address());
_pointerIo.writeInt(slot.length());
if (Deploy.debug) {
_pointerIo.writeEnd();
}
if (Debug4.xbytes) {
_pointerIo.checkXBytes(false);
}
writeBytes(_pointerIo, id, 0);
}
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 void overwriteDeletedBlockedSlot(Slot slot) {
overwriteDeletedBytes(slot.address(), _blockConverter.blocksToBytes(slot.length()));
}