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60 lines
2.5 KiB
60 lines
2.5 KiB
/*
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* ====================================================================
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with 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,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* 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 org.apache.http.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 class to which this annotation is applied is immutable. This means that
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* its state cannot be seen to change by callers, which implies that
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* <ul>
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* <li> all public fields are final, </li>
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* <li> all public final reference fields refer to other immutable objects, and </li>
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* <li> constructors and methods do not publish references to any internal state
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* which is potentially mutable by the implementation. </li>
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* </ul>
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* Immutable objects may still have internal mutable state for purposes of performance
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* optimization; some state variables may be lazily computed, so long as they are computed
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* from immutable state and that callers cannot tell the difference.
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* <p>
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* Immutable objects are inherently thread-safe; they may be passed between threads or
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* published without synchronization.
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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.TYPE)
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@Retention(RetentionPolicy.CLASS) // The original version used RUNTIME
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public @interface Immutable {
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}
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