/**
* Evict a single LN if allowed. The amount of memory freed is returned and must be subtracted
* from the memory budget by the caller.
*/
private long evictInternal(int index, Cleaner cleaner) throws DatabaseException {
Node n = getTarget(index);
if (n instanceof LN) {
LN ln = (LN) n;
/*
* Don't evict MapLNs for open databases (LN.isEvictable) [#13415].
* And don't strip LNs that the cleaner will be migrating
* (Cleaner.isEvictable).
*/
if (ln.isEvictable() && cleaner.isEvictable(this, index)) {
boolean force = getDatabase().isDeferredWriteMode() && getLsn(index) == DbLsn.NULL_LSN;
/* Log target if necessary. */
logDirtyLN(index, (LN) n, force);
/* Clear target. */
setTarget(index, null);
ln.releaseMemoryBudget();
return n.getMemorySizeIncludedByParent();
}
}
return 0;
}
/**
* Mark this entry as deleted, using the delete flag. Only BINS may do this.
*
* @param index indicates target entry
*/
@Override
public void setKnownDeleted(int index) {
/*
* The target is cleared to save memory, since a known deleted entry
* will never be fetched. The migrate flag is also cleared since
* migration is never needed for known deleted entries either.
*/
super.setKnownDeleted(index);
/*
* We know it's an LN because we never call setKnownDeleted for
* an IN.
*/
LN oldLN = (LN) getTarget(index);
updateMemorySize(oldLN, null /* newNode */);
if (oldLN != null) {
oldLN.releaseMemoryBudget();
}
setMigrate(index, false);
super.setTarget(index, null);
setDirty(true);
}