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55 lines
2.0 KiB
Java
55 lines
2.0 KiB
Java
/*
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* The MIT License
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*
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* Copyright (c) 2004-2009, Sun Microsystems, Inc., Kohsuke Kawaguchi
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package hudson;
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import java.lang.annotation.Documented;
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import static java.lang.annotation.ElementType.FIELD;
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import java.lang.annotation.Retention;
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import static java.lang.annotation.RetentionPolicy.SOURCE;
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import java.lang.annotation.Target;
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/**
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* Represents fields that are protected for concurrency by the copy-on-write semantics.
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*
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* <p>
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* Fields marked by this annotation always holds on to an immutable collection.
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* A change to the collection must be done by first creating a new collection
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* object, making changes, then replacing the reference atomically.
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*
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* <p>
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* This allows code to access the field without synchronization, and
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* greatly reduces the risk of dead-lock bugs.
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*
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* <p>
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* The field marked with this annotation usually needs to be marked as
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* {@code volatile}.
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*
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* @author Kohsuke Kawaguchi
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*/
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@Retention(SOURCE)
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@Documented
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@Target(FIELD)
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public @interface CopyOnWrite {
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}
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