trait RelabelObserver[Tx, -A] extends AnyRef
A RelabelObserver is notified before and after a relabeling is taking place due to
item insertions. The iterator passed to it contains all the items which are relabelled,
excluding the one that has caused the relabelling action.
Note that there is a tricky case, when an object creates more than one total order entry,
and then calls placeBefore or placeAfter successively on these entries: For the first
entry, the iterator will not contain the inserted element, but when the second entry is
inserted, the iterator will contain the first entry, with the potential of causing trouble
as the entry may be contained in an incompletely initialized object.
For example, in the case of storing pre-head, pre-tail and post elements in two orders, make sure that the pre-tail insertion comes last. Because this will happen:
(1) pre-head, post and pre-tail entries created (their tags are -1)
(2) pre-head placed, may cause relabelling, but then will be excluded from the iterator
(3) post placed, may cause relabelling, but then will be excluded from the iterator
(4) pre-tail placed, may cause relabelling, and while the pre-tail view will be excluded
from the iterator, the previously placed pre-head will be included in the iterator,
showing the item with pre-tail tag of -1 in beforeRelabeling, however, fortunately,
with assigned tag in afterRelabeling.
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- abstract def afterRelabeling(clean: Iterator[A])(implicit tx: Tx): Unit
This method is invoked right after relabelling finishes.
This method is invoked right after relabelling finishes. That is, the items in the
cleaniterator have been relabelled and the tags carry their new values. - abstract def beforeRelabeling(dirty: Iterator[A])(implicit tx: Tx): Unit
This method is invoked right before relabelling starts.
This method is invoked right before relabelling starts. That is, the items in the
dirtyiterator are about to be relabelled, but at the point of calling this method the tags still carry their previous values.
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