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 3GHz P4 IDE 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 2011

Save time! If you have any questions whilst evaluating VOSS for the first time, contact me by email: jc@logicarts.com  I’ll get back to you as soon as I can.

John

New in this release, 3.150.08 adds a feature to the garbage-collector which will return the sets of virtual objects which reference each of a specified set of ‘target’ virtual objects.

Download VOSS 3.150.08 here

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New in this release, 3.150.04 allows snapshot shadow hot backup of all connected virtual spaces without the need to take an application offline. On menu click from the control panel, or by program message send, the flow of transaction commits pauses for just a few seconds whilst the snapshot shadows are created, and then continues normal service whilst the shadow copies are backed up to a specified location.

Together with concurrent background garbage collection, this allows 24×7 operation of applications managing multi-gigabyte databases of objects in virtual spaces distributed over a Microsoft Windows Network Filesystem.

Download VOSS 3.150.04 here

John

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