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<h1 class="firstHeading">Using History</h1>
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<p>When ACIS entities and APIs are used, history and roll back are supported. The history and roll functionality tracks all changes that occur in an ACIS session, which permits rapid change between states of an ACIS model. The history manager allows both branched histories and linear histories, which provides even more flexibility for rolling between states.</p><p><a href="/r18/index.php?title=History_and_Roll&action=edit" class="new" title="History and Roll">ACIS history and roll</a> uses these levels:</p><table id="toc" class="toc" summary="Contents"><tr><td><div id="toctitle"><h2>Contents</h2></div><ul><li class="toclevel-1"><a href="#Bulletin"><span class="tocnumber">1</span> <span class="toctext">Bulletin</span></a></li><li class="toclevel-1"><a href="#Bulletin_board"><span class="tocnumber">2</span> <span class="toctext">Bulletin board</span></a></li><li class="toclevel-1"><a href="#Delta_state"><span class="tocnumber">3</span> <span class="toctext">Delta state</span></a></li><li class="toclevel-1"><a href="#History_stream"><span class="tocnumber">4</span> <span class="toctext">History stream</span></a></li></ul></td></tr></table><script type="text/javascript"> if (window.showTocToggle) { var tocShowText = "show"; var tocHideText = "hide"; showTocToggle(); } </script><a name="Bulletin"></a><h2> <span class="mw-headline">Bulletin</span></h2><p>Holds the changes to a single ACIS entity. Individual bulletins are not used outside the context of a bulletin board or delta state.</p><a name="Bulletin_board"></a><h2> <span class="mw-headline"> Bulletin board </span></h2><p>Holds all bulletins resulting from an API call.</p><a name="Delta_state"></a><h2> <span class="mw-headline"> Delta state</span></h2><p>The delta state is a user-definable, change-tracking structure of arbitrary size. It holds all bulletin boards resulting from a modification to a model. The delta state also has pointers to the previous, next, and partner delta states. The partner is a branch delta state at the same "sublevel."</p><a name="History_stream"></a><h2> <span class="mw-headline">History stream</span></h2><p>Contains pointers to the initial delta state, to the last noted active delta state, and to the delta state under construction. The history manager handles the history streams.</p><p>History streams for a given model can be saved with the model in its save file. Later, this entire structure can be restored, permitting roll back to any point in development.</p><p>The application developer uses the bulletin board to monitor changes to models throughout the modeling process. This is particularly effective for incrementally updating application models, such as finite element mesh or graphical representation maintained for display purposes.</p><!-- Tidy found serious XHTML errors --><!-- Saved in parser cache with key r18_docdb-r18doc_:pcache:idhash:460-0!1!0!!en!2!edit=0 and timestamp 20080624033701 --><div class="printfooter">Retrieved from "<a href="http://doc.spatial.com/r18/index.php/Using_History">http://doc.spatial.com/r18/index.php/Using_History</a>"</div> <div id="catlinks"><p class='catlinks'><a href="/r18/index.php/Special:Categories" title="Special:Categories">Categories</a>: <span dir='ltr'><a href="/r18/index.php/Category:ACIS_Docs" title="Category:ACIS Docs">ACIS Docs</a></span> | <span dir='ltr'><a href="/r18/index.php/Category:ACIS_Getting_Started" title="Category:ACIS Getting Started">ACIS Getting Started</a></span></p></div> <!-- end content -->
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