| public setValue ( RecordKey key, RecordUpdate update ) : void | ||
| key | RecordKey | |
| update | RecordUpdate | |
| Результат | void | |
// move the pending address into the freelist
private void handleRegionSafeToFree(long start_addr, FreespaceExtent extent, LayerWriteGroup wg)
{
System.Console.WriteLine("*\n*\n*\n* handleRegionSafeToFree {0} \n*\n*\n*", start_addr);
// (1) remove pending entry
wg.setValue(pendingKeyForAddr(start_addr), RecordUpdate.DeletionTombstone());
// (2) write real freelist entry (TODO: merge with neighboring entries)
{
RecordKey key = new RecordKey().appendParsedKey(".ROOT/FREELIST/EXTENTS");
key.appendKeyPart(new RecordKeyType_Long(extent.end_addr));
wg.setValue(key, RecordUpdate.WithPayload(extent.pack()));
}
wg.finish();
}
public void mapSegment(LayerWriteGroup tx, int use_gen,
RecordKey start_key, RecordKey end_key, IRegion reader)
{
if (! (tx.type == LayerWriteGroup.WriteGroupType.DISK_ATOMIC_NOFLUSH ||
tx.type == LayerWriteGroup.WriteGroupType.DISK_ATOMIC_FLUSH)) {
throw new Exception("NewUnusedSegment.mapSegment() must be provided an ATOMIC write group");
}
// remove the pending entry
RecordKey key = new RecordKey().appendParsedKey(".ROOT/FREELIST/PENDING");
key.appendKeyPart(new RecordKeyType_Long(reader.getStartAddress()));
tx.setValue(key, RecordUpdate.DeletionTombstone());
// add the new map
tx.mylayer.rangemapmgr.mapGenerationToRegion(tx, use_gen, start_key, end_key, reader);
}
public void freeSegment(LayerWriteGroup tx, FreespaceExtent segment_extent)
{
// (1) add the segment to the pending list (pending free)
if (tx.type != LayerWriteGroup.WriteGroupType.DISK_ATOMIC_FLUSH) {
throw new Exception("freeSegment() requires DISK_ATOMIC write group");
}
// NOTE: DISK_ATOMIC writes are not seen in the memory segment until the atomic write group applies
// so these changes will not be seen until then
RecordKey key = new RecordKey().appendParsedKey(".ROOT/FREELIST/PENDING")
.appendKeyPart(new RecordKeyType_Long(segment_extent.end_addr));
RecordUpdate payload = RecordUpdate.WithPayload(segment_extent.pack());
tx.setValue(key, payload);
// (2) add a handler to get notified when the block is no longer referenced, so it can
// be moved from pending to actually free.
LayerWriteGroup fwg = this.store.newWriteGroup(LayerWriteGroup.WriteGroupType.DISK_ATOMIC_NOFLUSH);
// we don't want to ask for the notification until the write-group freeing this segment is finished
tx.addCompletion(delegate() {
tx.mylayer.regionmgr.notifyRegionSafeToFree(segment_extent.start_addr,
delegate(long addr) { this.handleRegionSafeToFree(addr, segment_extent, fwg); });
});
}
