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Locking Roborealm to get variables picture
aldofad from Italy [3 posts] |
13 year
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Hi,
is there a way to consistently get some variables by locking Roborealm variables updates?
Example (wrong!)
RR_API.getVariable("NV_OBJECTS_TOTAL") = 2;
... wait some milliseconds ... but meanwhile internally in Roborealm NV_OBJECTS_TOTAL=1
//This array below only contains 1 value while I was expecting 2
RR_API.getVariable("NV_ARR_OBJ_SIM");
Is the problem clear?
I'm only asking if Roborealm is thread safe and provides locking through API
Many thanks, bye,
aldo
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Anonymous |
13 year
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Aldo,
Yes, the problem is clear. It is a classic race condition.
We can provide a means to stop this from happening but want to just check first what language you are using and if you (for now) could skip the first getVariable and just get the length from the result of the second getVariable. As the value for an array will be a comma delimited string that you need to break into individual values you would know the length based on the number of commas.
Or is your situation a little different?
If so, we can introduce a locking mechanism that will stop variables from being updated while you access their values ... but note that this will stop the entire pipeline for as long as the read takes ... which may or may not be ideal depending on what you are doing. Let us know if this would be useful to you.
STeven.
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aldofad from Italy [3 posts] |
13 year
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Hi Steven,
I'm successfully using Java with Roborealm and I've no problems managing this situation from my side with or without any lock on Roborealm.
Your point of view is correct, however it should be ok to provide a .lock() method on the API even if it stops the main pipeline since the final Roborealm's purpose in my situation is to provide variables informations to the program I'm writing.
Many thanks,
aldo
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Anonymous |
13 year
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Aldo,
We added a pause and resume function as part of the API. This is similar to a lock but is more appropriate to what is happening within RR. See the API.zip download at
http://www.roborealm.com/downloads/API.zip
to see these two new routines. You will also have to download 2.37.9 to have the updated API in RR.
Note that just in the same way as a unlock is needed you will have to ensure a resume is called before normal operation can continue.
Let us know if you need anything else.
STeven.
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aldofad from Italy [3 posts] |
13 year
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That's a very fast and good job Steven, thanks.
I imagine that the two new methods are relatively:
public boolean pause() {...<request><pause></pause></request>...}
public boolean resume() {...<request><resume></resume></request>...}
Thanks again,
aldo
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Anonymous |
13 year
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