Example #1
0
  /**
   * 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;
  }
Example #2
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);
  }