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• Immutable.java

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com.mongodb.annotations.Immutable Maven / Gradle / Ivy

/*
 * 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 constructors and methods do not publish references to any internal state which is potentially mutable by the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 {
}