HeliDB 1.1

HeliDB 1.1 offers you a simple and fast Java database for persisting key—value pairs from a Java program. Users have many choices in configuring what capabilities they want the database to have and in how the data is stored. In its simplest configuration, HeliDB is just a file-backed Map. More advanced configurations support transactions and fast searches and inserts through using B+ Trees.

Major Features:

1. The HeliDB Database interface extends Java's Map, so a HeliDB database can be used as a drop-in replacement for a Map.
2. The Database interface defines methods that are more efficient for working with persistent data than the methods from Map.
3. A database can be configured to support transactions.
4. Database operations can be made faster by indexing data in B+ Trees.
5. Database object creation is fast, so clients can create new databases as necessary without having to worry about performance.
6. The database runs in the same process as the Java program which makes database calls just local function calls. (i.e. fast)

Enhancements:

• This release adds support for searching for closest key matches. The new Cursor can be used to navigate through the records in a database
• Added the chapter on database searches to the Programmer's Guide.
• ConstantRecordSizeBPlusTreeBackend now supports using a custom Comparator.
• Database.compact and DatabaseBackend.compact now returns a boolean value.
• Added the find (x3), firstRecord and lastRecord methods to Database and implemented them for all databases.
• Added the Cursor class.
• Added the find (x2), getFirstPosition, getLastPosition, getNextPosition, getPreviousPosition and getContentsVersion methods to DatabaseBackend and implemented them for all backends.
• Changed the signature of NodeRepository to NodeRepository.
• Added the findRecord method to BPlusTree.
• Added the getFirstRecord, getLastRecord, getNextRecord and getPreviousRecord methods to BPlusTree.
• Added the CharacterToCharacterHasher.
• Added the ComparableComparator.
• Added the ChararcterNullSerializer.