/*
Copyright 2008-2010 Gephi
Authors : Mathieu Bastian <mathieu.bastian@gephi.org>
Website : http://www.gephi.org

This file is part of Gephi.

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Copyright 2011 Gephi Consortium. All rights reserved.

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or /cddl-1.0.txt and /gpl-3.0.txt. See the License for the
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 */

package org.gephi.filters.api;

import org.gephi.filters.spi.FilterProperty;

/**
 * PropertyExecutor's role is to synchronize property edition with filter
 * execution. When a filter is executed it usually uses properties users can
 * edit. Editing properties values while a filter is executing in another thread
 * could make uncertain behaviour. This executor is responsible to postpone
 * value edition until filter's execution is finished.
 *
 * @author Mathieu Bastian
 * @see FilterProperty
 */
public interface PropertyExecutor {

    /**
     * Set <code>value</code> on <code>property</code> in a safe way by using
     * <code>callback</code>.
     *
     * @param property the filter property that value is to be set
     * @param value    the value that is to be set
     * @param callback the callback function to be notified when setting has to
     *                 be done
     */
    void setValue(FilterProperty property, Object value, Callback callback);

    /**
     * Callback interface for setting value. When called, setting value is done
     * in a safe window between filter execution.
     */
    interface Callback {

        void setValue(Object value);
    }
}
