# Package org.apache.jmeter.engine.util

- Interface Summary
  Interface | Description
  --- | ---
  ConfigMergabilityIndicator | Interface that gives a hint about the merge policy to apply between Samplers and Config elements
  NoConfigMerge | Implement this method-less interface to indicate that this ConfigElement should not be merged.
  NoThreadClone | Implement this method-less interface to indicate your test element should not be cloned for each thread in a test run.

- Class Summary
  Class | Description
  --- | ---
  CompoundVariable | CompoundFunction.
  ReplaceFunctionsWithStrings | Transforms strings into variable references (in spite of the name, which suggests the opposite!)
  ReplaceStringWithFunctions | Replaces a String containing functions with their Function properties equivalent, example: ${__time()}_${__threadNum()}_${__machineName()} will become a FunctionProperty of a CompoundVariable containing 3 functions
  SimpleVariable |
  UndoVariableReplacement | Replaces ${key} by value extracted from `JMeterVariables` if any
  ValueReplacer | Perform replacement of ${variable} references.

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