How is a Scorecard object different from GlobalVariables? What are the Pros and Cons between them?
Article ID: KB0091967
Updated On:
| Products | Versions |
|---|---|
| TIBCO BusinessEvents Enterprise Edition | - |
| Not Applicable | - |
Description
Resolution:
Globalvariables
-------------------
Created during design time and loaded at run time has a flexibility of assigning a value through TRA files. At startup each engine (application) reads the TRA file and if it is overridden then it loads the value to the application memory (only one I/O operation during startup), if not it just gets the value from the project files and loads into the memory (again only one I/O operation). Subsequent API calls to reterive these values, are operations on the application memory (no more re-reading of TRA/project files). At runtime, each instance of an application maintains a value of a given global variable (i.e. a global variable named ObjectKount can have a value 100 in engine A, and a value 120 in Engine B).
With Global Variables, you cannot update the value of the Global variables at runtime.
Scorecard
-------------
Created during design time, and loaded at run time. One Scorecard can have multiple variables (like actnumber, balance in one scorecard object) and you need to assign a value to in startup rulefunctions (fired only at engine startup). Once this is in the engine (process) memory, you can access this variables directly (like xx = customer.actnumber), no I/O calls while accessing these values. Scorecards are also unique to each agent. Even if you have cache based OM, each instance of the scorecard object is associated with a AgentKey so it is unique across multiple agents.
With scorecards you can update the values at runtime using rules/rulefunctions (which in turn gets propogated to Cache/backend datastore.
Conclusion
--------------
In both approach, the loading of values into the variable happens only one time (during startup), after that subsequent access to these variables are in memory calls (no I/O done). And the choice depends on your exact needs, and if you wanted it to be persisted into cache and backingstore functionality in Business Events.
Globalvariables
-------------------
Created during design time and loaded at run time has a flexibility of assigning a value through TRA files. At startup each engine (application) reads the TRA file and if it is overridden then it loads the value to the application memory (only one I/O operation during startup), if not it just gets the value from the project files and loads into the memory (again only one I/O operation). Subsequent API calls to reterive these values, are operations on the application memory (no more re-reading of TRA/project files). At runtime, each instance of an application maintains a value of a given global variable (i.e. a global variable named ObjectKount can have a value 100 in engine A, and a value 120 in Engine B).
With Global Variables, you cannot update the value of the Global variables at runtime.
Scorecard
-------------
Created during design time, and loaded at run time. One Scorecard can have multiple variables (like actnumber, balance in one scorecard object) and you need to assign a value to in startup rulefunctions (fired only at engine startup). Once this is in the engine (process) memory, you can access this variables directly (like xx = customer.actnumber), no I/O calls while accessing these values. Scorecards are also unique to each agent. Even if you have cache based OM, each instance of the scorecard object is associated with a AgentKey so it is unique across multiple agents.
With scorecards you can update the values at runtime using rules/rulefunctions (which in turn gets propogated to Cache/backend datastore.
Conclusion
--------------
In both approach, the loading of values into the variable happens only one time (during startup), after that subsequent access to these variables are in memory calls (no I/O done). And the choice depends on your exact needs, and if you wanted it to be persisted into cache and backingstore functionality in Business Events.
Issue/Introduction
How is a Scorecard object different from GlobalVariables? What are the Pros and Cons between them?
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