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CQEngine Release Notes

Version 2.1.3 - 2016-03-24

  • Maintenance release.
  • Further improvements in index-accelerated ordering strategy.
  • ResultSet now implements java.io.Closeable, allowing use with Java 7 try-with-resources - closes issue #52.
  • Deployed to Maven Central.

Version 2.1.2 - 2016-03-23

  • Maintenance release.
  • Merged pull request #54 from devinrsmith which fixes an issue where calling MaterializingResultSet.hasNext() repeatedly without calling next() advances the iterator when it should not.
  • Fixed an edge case when index-accelerated ordering is enabled: if the primary attribute used for sorting was multi-valued, and some objects did not have any value for that attribute, then the objects which did not have a value for the attribute could be returned after the main results even if they did not fully match the query.
  • Deployed to Maven Central.

Version 2.1.1 - 2016-01-27

  • Maintenance release.
  • Merged pull requests from gzsombor and kminder which improve the handling of in() queries - many thanks!
  • Deployed to Maven Central.

Version 2.1.0 - 2015-08-24

  • Support for running SQL queries on the collection.
  • Support for running CQN (CQEngine Native) string-based queries on the collection (queries with the same syntax as programmatic queries, but in string form).
  • Significant performance improvements for complex queries.
  • Bulk import support for Off-heap and Disk persistence.
  • More fine-grained control over the ordering of objects by attributes where some objects might not have values for the attribute: orderBy(missingFirst(attribute)) and orderBy(missingLast(attribute)).
  • Nearly all indexes (On-heap, Off-heap and Disk) can now accelerate standing queries; StandingQueryIndex, which was on-heap only, is deprecated.
  • The statistics APIs exposed by indexes, now provide additional statistics on the distribution of values in the index, and allow applications to traverse indexes directly (for advanced use cases).
  • The performance of the "index" ordering strategy, useful for time time-series queries is improved.
  • Deployed to Maven central.
  • For more information and usage examples for this release see this post.

Version 2.0.3 - 2015-05-16

  • Updated Xerial SQLite driver used by DiskIndex and OffHeapIndex to 3.8.10.1, improves hot redeploy support in webapps
  • Deployed to Maven central

Version 2.0.2 - 2015-04-28

  • Improved the performance of DiskIndex and OffHeapIndex when processing string startsWith queries
  • Deployed to Maven central

Version 2.0.1 - 2015-04-20

  • Fixed exception when using index ordering strategy, when a range of values in the query is not in the collection
  • Added validation to prevent duplicate indexes getting added
  • Deployed to Maven central

Version 2.0.0 - 2015-04-07

  • New TransactionalIndexedCollection supports read-committed transaction isolation using Multi-Version Concurrency Control (MVCC)
  • New ordering algorithm which can take advantage of indexes (see orderingStrategy(INDEX))
  • New support to generate attributes automatically as bytecode (see AttributeBytecodeGenerator)
  • IndexedCollection can now be located in off-heap memory, or persisted on disk (see OffHeapPersistence and DiskPersistence)
  • New indexes can be located in off-heap memory, or persisted on disk (see OffHeapIndex and DiskIndex)
  • Tested with an IndexedCollections of 100 million objects
  • CQEngine 2.0 contains some API changes since 1.3.2 - see the updated examples on the site for details
  • Deployed to Maven central

Version 1.3.2 - 2015-01-14

  • Bugfix to NavigableIndex's handling of range queries where the range values are exclusive and a quantizer is configured
  • Deployed to Maven central

Version 1.3.1 - 2014-11-25

  • Added new query types: all(), none(), and regexMatches()
  • Deployed to Maven central

Version 1.2.7 - 2014-04-07

  • Maintenance release
  • Bugfix for ObjectLockingIndexedCollection.StripedLock's handling of negative hashcodes (issue 35)
  • Deployed to Maven central

Version 1.2.6 - 2014-01-07

  • Maintenance release
  • Bugfix for deduplication MATERIALIZE strategy (issue 32)
  • Deployed to Maven central

Version 1.2.4 - 2013-11-22

  • Maintenance release
  • Fixed "FilteringIterator.hasNext advances iterator every time it is called", with thanks to Gabe Hicks for patch (issue 23)
  • Fixed performance bottleneck in Query.hashCode(), with thanks to Atul Vasu for contribution (issue 25)
  • Fixed "Set remove() and removeAll() doesn't follow substitutability principle", with thanks to Atul Vasu for patch (issue 27)
  • Deployed to Maven central

Version 1.2.2 - 2013-09-22

  • Added AttributesGenerator, it is no longer necessary to write attributes by hand (issue 22)
  • See wiki page AttributesGenerator
  • Deployed to Maven central

Version 1.2.1 - 2013-09-10

  • Improved the toString representation of Query objects, query toStrings are now human readable (issue 19)
  • Bugfix in SelfAttribute (issue 21)
  • Deployed to Maven central

Version 1.2.0 - 2013-08-20

  • Added support to sort results in ascending/descending order on an attribute-by-attribute basis, with thanks to Roberto Socrates for patch (issue 16)
  • Example usage: cars.retrieve(query, queryOptions(orderBy(ascending(Car.DOORS), descending(Car.PRICE))))
  • This release involves a minor API change from CQEngine 1.1.x, so is not a drop-in replacement
  • Code using the old API to order results such as cars.retrieve(query, queryOptions(orderByDescending(Car.PRICE, Car.DOORS))) should be changed to that above
  • Deployed to Maven central

Version 1.1.1 - 2013-08-18

  • Additional work on ReflectiveAttribute to play nicer with inherited fields (issue 18)
  • Deployed to Maven central

Version 1.1.0 - 2013-08-16

  • Updated RadixTreeIndex, ReversedRadixTreeIndex, InvertedRadixTreeIndex, SuffixTreeIndex to use concurrent-trees library 2.1 for lower memory usage and lower latency (issue 14)
  • Added CQEngine.newObjectLockingInstance(int concurrencyLevel) providing object-level locking on the write path for applications in which threads might race each other to add/remove the same object (issue 9)
  • Bugfix to hashCode implementation in Not.java, would reduce collisions if queries stored in hash maps (issue 13)
  • Added support to SimpleAttribute to specify generic types manually via constructor to bypass reflection (issue 17)
  • Bugfix to ReflectiveAttribute to allow it to access private fields (issue 18)
  • Deployed to Maven central

Version 1.0.3 - 2012-12-07

  • Added new type of index, UniqueIndex, with thanks to Kinz Liu (issue 8) - can be used with primary-key type attributes to reduce memory usage and yield faster query performance
  • Added ReflectiveAttribute - reflection-based attribute, for trading performance for convenience/flexibility/simplifying dynamic queries in some cases (issue 6)
  • Added benchmarks for indexing overhead (issue 7)
  • Deployed to Maven central

Version 1.0.2 - 2012-11-22

  • Added support for Has queries - has(Car.DESCRIPTION) and not(has(Car.DESCRIPTION)) - the equivalent of SQL IS NOT NULL and IS NULL respectively. Use with SimpleNullableAttribute. These queries can be accelerated via StandingQueryIndex
  • Bugfix to updating compound indexes for objects added/removed after index added
  • Deployed to Maven central

Version 1.0.1 - 2012-11-17

  • Added support for customizing via factories, the construction of maps and sets used internally by HashIndex, NavigableIndex and CompoundIndex (concurrency level, load factor etc.) (issue 5)
  • Deployed to Maven central

Version 1.0.0 - 2012-10-29

  • Added support for attributes returning null values via SimpleNullableAttribute, MultiValueNullableAttribute (issue 2)
  • Bugfix to ResultSet.uniqueResult() (issue 4)
  • API same as in 0.9.1, no code changes necessary
  • Deployed to Maven central

Version 0.9.1 - 2012-07-18

  • Deployed to Maven central

Version 0.9.0 - 2012-07-14

  • Public upload of source