This document lists the various versions of the port of Miro Samek's Quantum Framework which encompasses Hierarchical State Machines and Active Objects:

v1.1.17.0 [May 14, 2006]

• The creation of the new threads for a new IQActive instances is abstracted by a thread factory. The DefaultThreadFactory creates regular threads. In contrast the ImpersonatingThreadFacotry transfers the thread secturity token from the calling thread to the new thread. This is important if the framework is used in conjuction with dynamic impersonation. 

v1.1.16.0 [August 18, 2005]

• David Shields sent me a fix to allow static transitions to be compatible with QHsm inheritance hierarchies more than 2 levels deep. The changed code can be found in the class TransitionChainStore (QHsm.cs). Thanks, David! 

v1.1.14.0 [Jan 27, 2005]

• When compiled under Visual Studio 2005 beta1 the examples OrthogonalComponent and RunToCompletion raised illegal cross-thread operation exceptions since the form was accessed from a non-UI. The new version fixes this issue.
  Note: If you use Visual Studio 2005 beta 1 make sure that you deselect Use Console Window under Tools/Options/Debugging/General. Otherwise you will encounter an illegal cross-thread operation when you run the console based examples in debug mode. If Use Console Window then Visual Studio will redirect Console.Write(Line) calls to an output window controlled by Visual Studio. It turns out that the redirected Console.Write(Line) is NOT thread-safe while the 'real' Console.Write(Line) is. I expect this to be fixed in a later release of Visual Studio 2005.
  

v1.1.13.0 [Jan 14, 2005]

• In addition to the sln and csproj files for VisualtStudio 2003 and .Net 1.1 a parallel set of solution and project files was added for VisualStudio 2005 and .Net 2.0 Beta1. The names of the new solution and project files are derived from the original names by appending _dotnet2.

v1.1.12.0 [Sep 18, 2004]

• QHSMs.cs: Fixed a bug in how a transition is recorded. Formerly it was not guaranteed that the final transition to the target state was recorded.
• QEventQueue.cs: Added Peek capability to QEventQueue.
• QActive.cs: Changed method name Stop to Abort. Added virtual method OnExecutionAborted that allows the deriving class to react to the abort of the active object.
• Samples: OrthogonalComponent.exe is part of the build now and hence available as an executable.

v1.1.11.0 [Jan 10, 2004]

• QF: This is the first release that provides a (mimimal) implemention the QF and its associated classes. The goal was to make it possible to implement the Dining Philosophers Problem. The following shortcuts were taken:
  • There is no event pool. I rely on the garbage collector to destroy no longer needed event instances. That also allows me to not implement the event propagation pattern that Miro Samek uses. I.e., currently the QF synchronously dispatches events to all the IQActive objects that subscribed for it and then forgets about the event.
  • The event queue is based on a linked list. This means that in addition to the actual event, the garbage collector also needs to collect the linked list node that holds the event once it is no longer needed. Avoiding the linked list nodes in favor of a queue that is based on an ArrayList should be a worthwile optimization.
• QHsm:
  • The signature of the state delegate has been changed to use an IQEvent interface instead of the QEvent base class. All samples have beeen updated accordingly. 
  • The previous version stored QState delegates in the static transition chains. These delegates point to methods on a given instance of a hierarchical state machine. Hence when events were played back via a stored transition chain they were played back against state methods of the specific state machine instance that they were recorded on. The new version recordes MethodInfo objects instead of QState delegates. During playback the MethodInfo object is used in conjunction with the this pointer of the currently executing QHsm to invoke the correct instance method.
  • The population of the transition chain in now thread-safe.
• New Samples:
  • Dining Philosophers
  • Reminder Pattern [by David Shields]
  • Run To Completion with interruptible step [by David Shields]. 

v1.0.6.2 [Dec 20, 2003]:

• New Sample Application CalculatorHSM provided by David Shields. Thanks David! The source code for the sample is provided in the subdirectory \Samples\CalculatorHSM.
  For details please see the associciated readme file in the same directory.
  

v1.0.0.2 [Dec 12, 2003]:

• OHsm.cs: Fixed bug in the coding of case g) in ExitUpToLCA > (check each super state of super state ... of my source state == super > state of super state of ... target state).
• QEvent.cs: This class now overrides the ToString() method to provide an easy way to debug or log what events are exchanged.
• Assembly HierarchicalStateMachine is now strongly typed. The key pair QHsm.snk is delivered as part of the source code.
• QHsmTest.cs: Cosmetic changes (better variable names)

v1.0.0.0 [Feb 1, 2003]: Initial release