There is the possibility for race conditions, so it depends what your
component is doing. If your component has the following method:
<cffunction name="performMath">
<cfargument name="num1" type="numeric" required="true" />
<cfargument name="num2" type="numeric" required="true" />
<cfset var result = (num1 * 2) + num2 />
<cfreturn result />
</cffunction>
This method in an application scoped component is thread safe. There is
no instance data that could change for each request.
But this method is not thread safe:
<cffunction name="performMath">
<cfset var result = (variables.num1 * 2) + variables.num2/>
<cfreturn result />
</cffunction>
Thread safety becomes an issue when you are dealing with instance data
within the component (the variables scope) that could change based on
the actions of a different request. In cases like this you would need
to lock the transaction just as you would any other shared scope
variable.
HTH,
Rich Kroll
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