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There is a newer version: 4.30.0

package liquibase.plugin;

import liquibase.servicelocator.PrioritizedService;

/**
 * Interface for objects designed to be pluggable in Liquibase.
 * Implementations of this class should be looked up via factories rather than instantiated directly to support the extension system.
 * 


 * The normal pattern for plugins is for {@link PluginFactory} implementations to return them.
 */
public interface Plugin {

    /**
     * Value to return from priority functions when the plugin is not applicable.
     */
    int PRIORITY_NOT_APPLICABLE = -1;

    /**
     * Value to return from priority functions when the plugin is the standard implementation.
     */
    int PRIORITY_DEFAULT = PrioritizedService.PRIORITY_DEFAULT;

    /**
     * Value to return from priority functions when the plugin is a specialized, non-default implementation.
     */
    int PRIORITY_SPECIALIZED = 10;


    int PRIORITY_DATABASE = PrioritizedService.PRIORITY_DATABASE;


}