/hudson-core/src/main/java/hudson/CopyOnWrite.java
http://github.com/hudson/hudson · Java · 54 lines · 11 code · 2 blank · 41 comment · 0 complexity · b376503885cbcae2b70dde6c3e7d8105 MD5 · raw file
- /*
- * The MIT License
- *
- * Copyright (c) 2004-2009, Sun Microsystems, Inc., Kohsuke Kawaguchi
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
- package hudson;
- import java.lang.annotation.Documented;
- import static java.lang.annotation.ElementType.FIELD;
- import java.lang.annotation.Retention;
- import static java.lang.annotation.RetentionPolicy.SOURCE;
- import java.lang.annotation.Target;
- /**
- * Represents fields that are protected for concurrency by the copy-on-write semantics.
- *
- * <p>
- * Fields marked by this annotation always holds on to an immutable collection.
- * A change to the collection must be done by first creating a new collection
- * object, making changes, then replacing the reference atomically.
- *
- * <p>
- * This allows code to access the field without synchronization, and
- * greatly reduces the risk of dead-lock bugs.
- *
- * <p>
- * The field marked with this annotation usually needs to be marked as
- * <tt>volatile</tt>.
- *
- * @author Kohsuke Kawaguchi
- */
- @Retention(SOURCE)
- @Documented
- @Target(FIELD)
- public @interface CopyOnWrite {
- }