com.mongodb.annotations.Immutable Maven / Gradle / Ivy
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/*
* Copyright (c) 2005 Brian Goetz and Tim Peierls
* Released under the Creative Commons Attribution License
* (http://creativecommons.org/licenses/by/2.5)
* Official home: http://www.jcip.net
*
* Any republication or derived work distributed in source code form
* must include this copyright and license notice.
*/
package com.mongodb.annotations;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
* The class to which this annotation is applied is immutable. This means that its state cannot be seen to change by callers, which
* implies that
*
* - all public fields are final,
* - all public final reference fields refer to other immutable objects, and
* - constructors and methods do not publish references to any internal state which is potentially mutable by the
* implementation.
*
* Immutable objects may still have internal mutable state for purposes of performance optimization; some state
* variables may be lazily computed, so long as they are computed from immutable state and that callers cannot tell the difference.
*
* Immutable objects are inherently thread-safe; they may be passed between threads or published without synchronization.
*/
@Documented
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface Immutable {
}