The field (or other reference) 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
Lock.
The argument is a string that indicates which lock guards the annotated variable:
-
this : The intrinsic lock of the object in whose class the field 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.