VOSS 3.1

Transparent Persistence

+ Transaction Processing…

Smalltalk is pure object-oriented programming for complex business and technical applications, but the benefits of this can be lost in the well-known ‘impedance mismatch’ with relational databases.

The VOSS open source virtual object storage system extends Smalltalk with integrated database management, providing transparent multi-user access and transaction processing of persistent, versioned, Smalltalk objects directly accessible by normal programming, with efficient persistent Btree collection classes, including the multi-key/multi-value/key-set VirtualDictionarySet for aggregation and query-building.

• Multi-process, multi-machine transactional access to distributed objects
• ACID transactions with two-phase commit, logging and rollforward crash recovery
• Persist clustered complexes of any Smalltalk classes except block closures
• Historical object versioning, MVRC repeatable read, MVCC concurrency control
• Automatic object locking with transaction rollback & retry on deadlock time-out
• Automatic change detection, no lock conflicts with sub-transactions, short read-locks
• Multi-key/multi-value/key-set Btree VirtualDictionarySet with query-building methods
• Continuation Transactions manage alternative futures for design or what-if
• Long Continuation Transactions may be persisted prior to ultimate commit/rollback
• Web server / application process rendezvous
• Distributed copying, parented copying, identity-exchange, checkout, read-only etc
• 24×7 operation, with concurrent variable-rate incremental foreground & background garbage collection and snapshot backup of the set of distributed virtual spaces.
• Up to 150 logged & flushed transactions per second on desktop hardware
• Terabyte 64-bit object id and addressing default, configurable up to 128-bit
• Dual Licensing - Open Source GPLv3 and/or Supported Commercial Licence

…Seamless Smalltalk Solutions

(C) Logic Arts Ltd 2009

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