io.fabric8.utils.jcip.GuardedBy Maven / Gradle / Ivy

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/**
 *  Copyright 2005-2016 Red Hat, Inc.
 *
 *  Red Hat licenses this file to you under the Apache License, version
 *  2.0 (the "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 *  implied.  See the License for the specific language governing
 *  permissions and limitations under the License.
 */
package io.fabric8.utils.jcip;

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.
 *
 * The argument determines which lock guards the annotated field or method:
 * 
 * 
 * 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.
 * 
 */
@Target({ElementType.FIELD, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
public @interface GuardedBy {
    String value();
}