Framework:System

The ACIS System represents the core functionality upon which the modeling system is based. Essentially, the core functionality manages models such as creating, copying, deleting, as well as saving and restoring models to disk. This framework also discusses ACIS' history mechanism for implementing undo/redo for your models, and best practices for optimizing your applications that use ACIS.

Component	Description
Base	The Base component (BASE) contains system-related functionality for multiple products, including: Memory Management Error Handling Multi-Threading and Thread Safety Global Options Math Classes and Functions
Kernel	The Kernel component (KERN) contains system-related functionality for the ACIS product, including: Entities Attributes Copying Models Deleting Models Saving and Restoring Models History and Roll Versioning Journaling Annotations

Topic	Description
Key Aspects of C++	Describes how C++ is used by ACIS.
ACIS Architecture	Provides an overview of the program structure of ACIS.
Initialization and Termination	Recommendations for when and how to initialize/terminate ACIS.
Lists	Variable length lists to maintain sets of objects.
Minimizing Memory	Techniques to reduce ACIS' memory usage (sometimes at the cost of performance).
Optimizing Performance	Techniques to streamline ACIS' performance (sometimes at the cost of consuming more memory).

Some of the ACIS R23 improvements are:

• ACIS Linux binaries are now Thread-Safe
• Modifiable Number of Worker Threads
• Improved History Stream Merging
• Restructuring of Healing APIs