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Welcome to the latest release of The ACE ORB (TAO). TAO is a freely
available, open-source implementation of a CORBA 2.x-compliant ORB
that supports real-time extensions. Please see
www.cs.wustl.edu/~schmidt/TAO.html for more information on TAO.
Detailed information on this version of TAO is available in the 'docs'
subdirectory in HTML format.
The current alpha release of TAO contains the following:
* An ORB Core based on ACE C++ components. This ORB Core provides 3
concurrency models: (1) Reactive, (2) Thread-per-Connection,
and (3) Thread-per-Rate (which is optimized for certain types
of deterministic real-time systems).
* An optimized version of the SunSoft IIOP protocol
interpreter;
* An implementation of the Portable Object Adapter (POA)
specification.
* An IDL compiler, based on the SunSoft IDL compiler. This IDL
compiler generates stubs and skeletons that use TAO's
optimized IIOP protocol engine.
* A Real-time Scheduling Service that determines the priority at
which Client requests are dispatched by the ORB.
* A Real-time Event Service that dispatches CORBA events in
real-time.
* Implementations of the CORBA Naming Service, Trading
Service, Concurrency Service, Audio/Video Streaming
Service, Property Service, and a Logging Service.
* Many tests illustrating how to use TAO and measuring
TAO's performance.
We've gotten TAO to interoperate with other ORBs (e.g., Orbix,
VisiBroker, miniCOOL, and CORBAplus), so we're confident that its
implementation of IIOP is robust. We're currently working on the
following features for TAO:
* An IDL compiler that generates optimized compiled stubs and
skeletons.
* A highly extensible, highly optimized set of request
demultiplexing strategies that provide constant time lookup of
servants based on object keys and operation names contained in
CORBA requests.
We plan to release these features throughout the fall of 1998. You
can keep track of our progress online at URL
www.cs.wustl.edu/~schmidt/ACE_wrappers/TAO/docs/releasenotes/
A quick build note for users who have used ACE with other ORBs:
linking TAO with a version of ACE that must also be linked against
another ORB vendor's library, e.g., liborbix.so, will produce
undefined and most likely unpredictable and erroneous results.
We welcome suggestions for improvement, bug fixes, portability
enhancements, etc. and will strive to integrate correct bug fixes
quickly! If you have any questions or problems with TAO, please post
them to the ACE mailing list (ace-users@cs.wustl.edu) or send email to
Douglas C. Schmidt (schmidt@cs.wustl.edu) and Nanbor Wang
(nanbor@cs.wustl.edu).
Thanks,
Douglas C. Schmidt
schmidt@cs.wustl.edu
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