[#BloombergLP-ball-AttributeContext-determineThresholdLevels]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/ball.adoc[ball]::xref:BloombergLP/ball/AttributeContext.adoc[AttributeContext]::determineThresholdLevels
:relfileprefix: ../../../
:mrdocs:

Populate the specified `levels` with the threshold levels for the specified `category`. This method compares the threshold levels defined by `category` with those of any active rules that apply to that category, and determines the minimum severity (i.e., the maximum numerical value) for each respective threshold amongst those values. A rule applies to `category` if the rule's pattern matches `category‐>categoryName()`, and a rule is active if all the attributes defined for that rule are satisfied by the current thread's attributes (i.e., `Rule::evaluate` returns `true` for the collection of attributes maintained by this object). This method operates on the set of rules maintained by the category manager supplied to the `initialize` class method (which, in practice, should be the global set of rules for the process). The behavior is undefined unless `initialize` has previously been invoked without a subsequent call to `reset`, and `category` is contained in the registry maintained by the category manager supplied to `initialize`.

== Synopsis

Declared in `<ball_attributecontext.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
determineThresholdLevels(
    xref:BloombergLP/ball/ThresholdAggregate.adoc[ThresholdAggregate]* levels,
    xref:BloombergLP/ball/Category.adoc[Category] const* category) const;
----


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