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76 lines
3.1 KiB
Java
76 lines
3.1 KiB
Java
/*
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* ====================================================================
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*
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*/
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package ch.boye.httpclientandroidlib.annotation;
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import java.lang.annotation.Documented;
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import java.lang.annotation.ElementType;
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import java.lang.annotation.Retention;
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import java.lang.annotation.RetentionPolicy;
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import java.lang.annotation.Target;
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/**
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* The field or method to which this annotation is applied can only be accessed
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* when holding a particular lock, which may be a built-in (synchronization) lock,
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* or may be an explicit java.util.concurrent.Lock.
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*
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* The argument determines which lock guards the annotated field or method:
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* <ul>
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* <li>
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* <code>this</code> : The intrinsic lock of the object in whose class the field is defined.
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* </li>
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* <li>
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* <code>class-name.this</code> : For inner classes, it may be necessary to disambiguate 'this';
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* the <em>class-name.this</em> designation allows you to specify which 'this' reference is intended
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* </li>
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* <li>
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* <code>itself</code> : For reference fields only; the object to which the field refers.
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* </li>
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* <li>
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* <code>field-name</code> : The lock object is referenced by the (instance or static) field
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* specified by <em>field-name</em>.
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* </li>
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* <li>
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* <code>class-name.field-name</code> : The lock object is reference by the static field specified
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* by <em>class-name.field-name</em>.
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* </li>
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* <li>
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* <code>method-name()</code> : The lock object is returned by calling the named nil-ary method.
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* </li>
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* <li>
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* <code>class-name.class</code> : The Class object for the specified class should be used as the lock object.
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* </li>
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* <p>
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* Based on code developed by Brian Goetz and Tim Peierls and concepts
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* published in 'Java Concurrency in Practice' by Brian Goetz, Tim Peierls,
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* Joshua Bloch, Joseph Bowbeer, David Holmes and Doug Lea.
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*/
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@Documented
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@Target({ElementType.FIELD, ElementType.METHOD})
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@Retention(RetentionPolicy.CLASS) // The original version used RUNTIME
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public @interface GuardedBy {
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String value();
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}
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