Best practices - dynamic distribution of VI with LV2011

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• Distribution dynamically to user input; best practices?

  Hi all

  Using LabVIEW 2013 (32 bit). Taking my first foray in LVOOP and I am currently designing our user input. This user of VI entry is distributed dynamically. The goal is to allow the user to "mix and match" different parts of the application as much as possible. The request is for a controller of a biological system. In particular, we have the notion of 'Controller', a 'model' and a 'Patient'. All patients have the same characteristics, but the controllers and models only share an external interface. Some controllers can control to a set point, some of a range, some to a set of ranges depending on the time and the current status of the Patient. As such, I would like to have some kind of dynamic dispatching on the phase of input from the user. The way I thought to do was via sub-panels, with a tab control to allow the user to move between different parts of the installation.

  This is a model of the façade of the user input:

  http://i.imgur.com/sMZ7xFD.PNG

  So if you have a controller of some, this interface panel controllers user come in a secondary, through a kind of dynamic distribution. This would allow you to move seamlessly between the controllers and have always a consistent user experience, for example, 1 controller can have you choose a range to control (two digital figures), while the controller 2 can have a control point (just a digital), as follows:

  http://i.imgur.com/6QpKXco.PNG

  http://i.imgur.com/u2mla8N.PNG

  You can assume that we have access to instances of the controller class, the class Patient and the model class at this stage of the dynamic allocation.

  When I tried to implement this, I came across some problems:

  http://i.imgur.com/2ZZqdka.PNG

  The error is: "call by reference: refers to a dynamic member VI; The stream of strictly typed reference VI entry connector includes a terminal dynamically a reshipment, which is that he is part of a method of a class of LabVIEW. Dynamic member screws are not supported in this version of LabVIEW by calling the reference node. »

  I understand the problem, it's may be too general for LabVIEW manage cleanly, but is there a way for me to maintain the "kindness" of dynamic distribution in this case accurate?

  What I did do a VI 'protected' which was the dynamic distribution to get the reference to the GUI VI.  This way I could make the object show GUI of the parent if I wanted to rather than making yet another screen.  This VI was called by a public VI that only the top parent class should manage (static shipping).  I did not use the asynchronous call, but I think it would work.

  

• Summary of functions (two entries) for classes of brother with a dynamic distribution of entry: the static entry retains the type of the parent class.

  Suppose that in a hypothetical example, I have a superclass (number) with two children (real and complex) classes.

  I would define a function of sum for these classes, using dynamic distribution.

  Real or complex would have its own method of the sum (VI) which would be subject to various operations, such as the real and complex numbers are different.

  As I understand it, the normal way to proceed in OOP is for each of these methods to have an entry of dynamic distribution and a static entry of its own type.

  Problem: Labview doesn't let me do this!

  I first define an input method dynamic-shipping dummy for the numberof the parent class, but only the first entry can be dynamic-Envoy while the other is statically typed as number.

  Then, when I create override methods in my two children classes real and complex, the second entry (static) remains under the number (the type of the parent class). This is not fair, because then I can't access the private data of the child class of type real or complex that will be connected to the second input (static).

  What is the solution to this problem (usually)?

  I think that, in LVOOP, you use only a dynamic terminal or a static terminal to the terminal object.

  You can have several other terminals, but all the dynamics VI (methods with the same name) must have the same API (terminals).

  If you have to understand your preferred mode to pass, use multiple terminals, not used by each method, or use a cluster that contains all the numbers to pass (real or complex, both of which are not used in each method) or you can try a Variant, as shown.

• Combining LVOOP DVR with dynamic distribution class and asynchronous Runtime Preserve

  OK, the title seems like a cornucopia of terms LVOOP.  But there's a reason.  It is sort of an extension of THIS thread.

  Do I have recently created a LVOOP approach to load completely asynchronous user interface elements into sub-panels.  This I have combined with a global repository for objects (which are essentially the singletons with functionality of the user interface) which are shared via DVR, thus eliminating a large number of synchronization headaches).

  This means that I can have a universal framework to initiate a secondary user interface elements.  Changes made to the object there are automatically reflected in the global repository.

  So far so good.

  What I do like is a combination of two buildings of apparently clumsy code that I need to keep things running.

  Construct odd 1:

  I defined a function "Launch UI" in my parent class which is the dynamic distribution (which allows to take care to launch its own UI of each object).  It takes a parent DVR as second entry object which sure is the exact type and the type of object called using the code below.  The Type REAL to two entries for the launch of VI in PEI are identical.  This is guaranteed because I need every new class instead of this function.

  

  Here I pass the DVR from outside to 'Launch' VI International preliminary examination, but the object obtained within the IPE retains information for DD thereby ensuring that the VI called for the launch of the user interface is identical to the type of object in the DVR REAL.  It works well and putting this bizarre construction within the parent class, abuse is minimized, it works very well and seems to have no major side effects.

  So now we have a VI running asynchronously in the background that belongs to a specific object, but has a DVR which it * thinks * is a parent Type, but because of the measures taken previously, is actually of the same type as the object itself.

  In order to make use of the functionality defined in this kind of real object, I continually have to re - interpret the object within the IPE as described below.  Otherwise only the Parent feature is available.

  

  If I access only methods of the parent class, then the Preserve feature is not necessary.

  Is there a more elegant way to do it?  I find the net result of this code and cast to be really useful and much easier to manage the road non - DVR since synchronization problems disappear.  Through the use of the near-atomic REI, we remove the chances of blocking.

  All editing in the asynchronous interface user of VI is automatically reflected in all subsequent use of the DVR.  Even if digital recorders are not shared between the screws, this makes it easier (for me) the puzzle of the synchronization.  If you start this expansion beyond the limits of a single VI, the benefits in synchronization becomes really huge.  You can even have several interface user objects based on the same data in the background without additional synchronization needs.  Required only one synchronization is a global 'data updates' for the object in question, in which case the UI elements simply update their indicators and the DVR's controls again.  It is trivial.

  So, I am convinced that the net result of this is very beneficial.

  My question is if there is a better, safer, or more 'official' way to do?

  I was about to start a new idea to combine the 'Preserve Run time class' and Terminal DVR of the International preliminary examination so that the casting is done automatically.  We could then have a double entry in PEI, the DVR (of the base type) as well as the ACTUAL Type of the object, but of course to return an error if the types are incompatible.  It would be like an "imposter" DVR of entry for International preliminary examination which allows a re-interpretation of the object type.

  Would all of this go away if we allowed dynamic distribution work with DVRs?  No doubt.

  Shane

  I agree that the deletion of bizarre construction #1 probably requires a dynamic send on DVR.  Unfortunately, if you look at the post of the exchange of ideas on that, there are a few nasty subtleties concerned by the application, so I wasn't expecting any time soon.

  For bizarre construction #2, you can cast the DVR itself.  Make a constant DVR that refers to the class of the child and lowered it seized goes in PEI.  If you need to return the parent type after the International preliminary examination, branch just the wire DVR before melting and use it as your lead.

• Best practices with streams WCCP of WAAS

  Hello

  I have a module WAAS SRE 910 in 2911 router that intercepts packets this router with WCCP.

  All packets are received by the external interface (gi 0/2, connected to a switch with port configured in vlan WCCP) and are sent back to the router via the internal interface (IG 1/0 connected directly to the router):

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  The default route configured in module WAAS is 0.0.0.0/0 to 10.0.1.254 (interface of the router).

  It would be better that the packets leave module WAAS of the external interface (instead of the internal interface)?

  Is there a best practice recommended by Cisco on this?

  Thank you.

  Stéphane

  Hi Stephane,

  That's right, internal interface means SM1/0.

  The best way is to have traffic at the start of the internal interface module so that we are sure, it hits the redirect exclude statement and that we do not have the crest of the loops because WCCP.

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  Question/design architecture with best practices?
  
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  Hello

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