jsr94facthandle.java

drools 一个开放源码的规则引擎

package org.drools.jsr94.rules;

/*
 * $Id: Jsr94FactHandle.java,v 1.14 2005/02/04 02:13:38 mproctor Exp $
 *
 * Copyright 2003-2004 (C) The Werken Company. All Rights Reserved.
 *
 * Redistribution and use of this software and associated documentation
 * ("Software"), with or without modification, are permitted provided that the
 * following conditions are met:
 *
 * 1. Redistributions of source code must retain copyright statements and
 * notices. Redistributions must also contain a copy of this document.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. The name "drools" must not be used to endorse or promote products derived
 * from this Software without prior written permission of The Werken Company.
 * For written permission, please contact [e-mail].
 *
 * 4. Products derived from this Software may not be called "drools" nor may
 * "drools" appear in their names without prior written permission of The Werken
 * Company. "drools" is a registered trademark of The Werken Company.
 *
 * 5. Due credit should be given to The Werken Company.
 * (http://drools.werken.com/).
 *
 * THIS SOFTWARE IS PROVIDED BY THE WERKEN COMPANY AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE WERKEN COMPANY OR ITS CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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 */

import javax.rules.Handle;

import org.drools.reteoo.FactHandleImpl;

/**
 * The Drools implementation of the <code>Handle</code> interface which provides
 * a marker interface for Drools-specific object identity mechanism. When using
 * the <code>StatefulRuleSession</code> objects that are added to rule session
 * state are identified using a Drools-supplied <code>Handle</code>
 * implementation.
 * <p/>
 * <code>Handle</code>s are used to unambigiously identify objects within the
 * rule session state and should not suffer many of the object identity issues
 * that arise when using muliple class loaders, serializing
 * <code>StatefulRuleSessions</code>, or using <code>Object.equals</code> or
 * <code>object1 == object2</code> reference equality.
 */
public class Jsr94FactHandle extends FactHandleImpl implements Handle
{
    /**
     * Constructs a new <code>Handle</code>.
     *
     * @param id A unique <code>Handle</code> id.
     * @param recency A value indicating the recency of this <code>Handle</code>
     *        (more recently created <code>Handle</code>s have greater values
     *         than <code>Handle</code>s created further in the past)
     *
     * @see org.drools.conflict.RecencyConflictResolver
     */
    Jsr94FactHandle( long id, long recency )
    {
        super( id, recency );
    }
}