| GuardedBy
The field or method to which this annotation is applied can only be accessed
when holding a particular lock, which may be a built-in (synchronization) lock,
or may be an explicit java.util.concurrent.Lock.
The argument determines which lock guards the annotated field or method:
this : The string literal "this" means that this field is guarded by the
class in which it is defined.
class-name.this : For inner classes, it may be necessary to disambiguate 'this';
the class-name.this designation allows you to specify which 'this' reference is intended
itself : For reference fields only; the object to which the field refers.
field-name : The lock object is referenced by the (instance or static) field specified by field-name.
class-name.field-name : The lock object is reference by the static field specified by class-name.field-name.
method-name() : The lock object is returned by calling the named nil-ary method.
class-name.class : The Class object for the specified class should be used as the lock object.
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