GuardedBy

```
@Documented
@Target({FIELD,METHOD})
@Retention(RUNTIME)
public @interface GuardedBy
```
The presence of this annotation indicates that the field or method must only be accessed when holding the specified lock.

- Required Element Summary
  
  Required Elements
  Modifier and Type Required Element Description
  
  java.lang.String value
  The specified lock that guards the annotated field or method.

- Element Detail
  - value
```
java.lang.String value
```
    The specified lock that guards the annotated field or method. Valid values are:
    
    this indicates the intrinsic lock of the instance containing the field or method.
    
    class-name.this which allows for disambiguation of which this when dealing with inner classes
    
    itself which is valid for reference fields only, and indicates that the referenced instance's own intrinsic lock should be used as the guard
    
    field-name indicates the named instance or static field is to be used as the guard. If the field type is not a sub-type of Lock then the intrinsic lock of the referenced instance is to be used
    
    class-name.field-name indicates the named static field is to be used as the guard. If the field type is not a sub-type of Lock then the intrinsic lock of the referenced instance is to be used
    
    method-name() indicates that the zero-argument method should be called to obtain the lock object. If the return type is not a sub-type of Lock then the intrinsic lock of the returned instance is to be used
    
    class-name.class indicates that the intrinsic lock of the specified class should be used as the guard
    Returns:
    
    The specified lock that guards the annotated field or method