Optional variableName: string | symbolName of the variable to store the promise in. When not specified a unique variable name is generated.
MethodDecorator
This decorator is not meant for methods that are called in parallel with different arguments.
Prevent a method from being executed in parallel by returning the same promise when the method is already executing.
This can be useful when you have a method that is called multiple times in parallel and you want to prevent the method from being executed multiple times.