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Lightweight, extremely fast, and zero-gc message/event bus for Java 8+

There is a newer version: 2.7

/*
 * Copyright 2012 Benjamin Diedrichsen
 *
 * 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 dorkbox.messagebus.annotations;

/**
 * @author bennidi
 *         Date: 3/29/13
 * @author dorkbox, llc
 *         Date: 2/6/16
 */
public enum References {
    /** This is the default */
    Undefined,


    /**
     * Strong references are faster than weak, as there are no extra steps necessary (to clean up the data structures) during
     * mesasge publication.
     */
    Strong,

    /**
     * This is provided so memory management in containers (such as spring) is easier. This is slower access than Strong refs because of
     * the additional checks for orphan/GC'd objects in the subscription lists during publication.
     */
    Weak
}