/*
* Copyright (c) 2005 Brian Goetz and Tim Peierls
* Released under the Creative Commons Attribution License
* (http://creativecommons.org/licenses/by/2.5)
* Official home: http://www.jcip.net
*
* Any republication or derived work distributed in source code form
* must include this copyright and license notice.
*/
package net.jcip.annotations;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
* 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.
* <p/>
* The argument determines which lock guards the annotated field or method:
* <ul>
* <li>
* <code>this</code> : The intrinsic lock of the object in whose class the field is defined.
* </li>
* <li>
* <code>class-name.this</code> : For inner classes, it may be necessary to disambiguate 'this';
* the <em>class-name.this</em> designation allows you to specify which 'this' reference is intended
* </li>
* <li>
* <code>itself</code> : For reference fields only; the object to which the field refers.
* </li>
* <li>
* <code>field-name</code> : The lock object is referenced by the (instance or static) field
* specified by <em>field-name</em>.
* </li>
* <li>
* <code>class-name.field-name</code> : The lock object is reference by the static field specified
* by <em>class-name.field-name</em>.
* </li>
* <li>
* <code>method-name()</code> : The lock object is returned by calling the named nil-ary method.
* </li>
* <li>
* <code>class-name.class</code> : The Class object for the specified class should be used as the
* lock object.
* </li>
*/
@Target({ElementType.FIELD, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
public @interface GuardedBy {
String value();
}