Comments (6)
This is a good suggestion, thanks. And fairly easy to implement.
I'll look into adding some proper support as suggested over the next few days.
However in the meantime, there is a way to achieve this in the current release,
even though it's a bit awkward. (I guess you might have done this already...)
You can subclass HashIndex as (say) CustomHashIndex, and override the
getIndexMap() method. That method should return the same ConcurrentMap every
time it's called, but you can construct the map with concurrency/load factor
however you like. Your effectively custom index would then be usable with
CQEngine as normal.
Expect less awkward support for this in the next few days, in the built-in
HashIndex and others. Hopefully I'll get time to package this as a 1.0.1
release at the weekend.
Original comment by [email protected]
on 12 Nov 2012 at 1:47
- Changed state: Accepted
- Added labels: Type-Enhancement
- Removed labels: Type-Defect
from cqengine.
EDIT: actually subclassing alone won't be enough. The current code access the
map field directly. Grrr. Theoretically for [unvalidated] performance reasons.
So the temporary workaround might be to copy and paste the code into a
subclass. ...yes better support for this is definitely required.
Original comment by [email protected]
on 12 Nov 2012 at 1:54
from cqengine.
Thanks, looking forward to the 1.0.1.
Original comment by [email protected]
on 12 Nov 2012 at 1:59
from cqengine.
Original comment by [email protected]
on 13 Nov 2012 at 11:24
- Changed state: Started
from cqengine.
Changes in trunk, will prepare 1.0.1 release over the next few days.
Original comment by [email protected]
on 16 Nov 2012 at 12:02
from cqengine.
Done.
HashIndex, NavigableIndex and CompoundIndex now optionally accept Factories to
customize the construction of maps and sets which those indexes use internally.
Example of new methods added to HashIndex:
public static <A,O> HashIndex<A,O> onAttribute(
Factory<ConcurrentMap<A,StoredResultSet<O>>> indexMapFactory,
Factory<StoredResultSet<O>> valueSetFactory,
Attribute<O,A> attribute)
Release 1.0.1 is queued for sync with maven central.
Original comment by [email protected]
on 17 Nov 2012 at 11:29
- Changed state: Done
from cqengine.
Related Issues (20)
- Auto-generate attributes HOT 2
- FilteringIterator.hasNext advances iterator every time it is called. HOT 6
- Recommendation on ID indexes HOT 1
- And.calcHashCode being performance Bottlneck HOT 11
- Set.add semantics is not perfect. HOT 4
- Set remove() and removeAll() doesn't follow substitutability principle. HOT 4
- Add listeners (observers) to IndexedCollection HOT 5
- Add support for query "dialects" like SQL HOT 2
- Documentation for selective READ_COMMITTED transaction isolation using RW lock HOT 2
- Support lock-free READ_COMMITTED transaction isolation via multiple buffering HOT 2
- DeduplicationStrategy.MATERIALIZE broken in 1.2.4 HOT 1
- Modify Or/And to allow only one child. HOT 2
- Comparing two objects? HOT 1
- ObjectLockingIndexedCollection's StripedLock does not handle negative hashcodes HOT 1
- Multiversion concurrency control(MVCC) should be implemented for transaction isolation HOT 2
- Query CONSISTENTLY slower with the addition of NavigableIndex HOT 1
- Provide the way to determine how much memory used by index HOT 2
- Attribute#getValues to return Iterable HOT 1
- deduplication not return duplicate objects from the collection HOT 3
- IllegalArgumentException when ResultSet.getMergeCost() changes during query HOT 3
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