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Liquibase is a tool for managing and executing database changes.
There is a newer version: 4.30.0
package liquibase.license; 

import liquibase.plugin.Plugin;

import java.util.Date;

public interface LicenseService extends Plugin {

  /**
   *
   * This method returns a priority value for an implementation. Liquibase uses this to
   * determine which LicenseService is currently in use. There can only be a single
   * LicenseService used at a time, and the highest priority implementation wins.
   *
   * @return  int
   *
   */
  int getPriority();

  /**
   * This method checks whether there is any license with any valid subject installed.
   *  
   * @return true if any license with any valid subject is installed.
   */
  boolean licenseIsInstalled();
  
  /**
   * Check if an installed license with the given subject is valid or not. The set of 
   * subjects that are valid is defined by the implementation.
   * 
   * @return true if the license with the given subject is valid.
   */
  boolean licenseIsValid(String subject);
  
  /**
   * @return a string representation of the license(s) installed for display in logs, etc.
   */
  String getLicenseInfo();

  /**
   *
   * @return
   */
  LicenseInfo getLicenseInfoObject();

  /**
   *
   * Given a list of potential locations that a license file could be located,
   * check each one and install any .lic files that are found there, iterating until
   * a valid license is installed successfully or all the locations have been tried.
   * After calling this method, clients still need to check licenseIsValid().
   * 
   * @param locations - A variable number of Location objects, each of which has a name, 
   * a type, and a value.
   * @return A data structure that contains an overall exit code plus a list of strings
   * that detail the locations checked and the result of checking each location.
   */
  LicenseInstallResult installLicense(Location... locations);

  /**
   *
   * Disable this LicenseService
   * This can be used to turn off license checking
   * after it has been determined that a license
   * key is not valid
   *
   */
  void disable();

  /**
   * Delete any cached, installed licenses currently tracked by the implementation.
   */
  default void reset() {

  }

  /**
   * @return true if any installed license is valid but will expire within the next 30 days.
   */
  boolean licenseIsAboutToExpire();

  /**
   * It is possible that users might have multiple licenses installed. In that case,
   * this will return the lowest number.
   * 
   * @return the number of whole days until the license expires. Negative numbers 
   * would indicate that the license expired that many days ago.
   */
  int daysTilExpiration();

  /**
   * Get the expiration date of the installed license.
   * @return the expiration date, or null if no license can be found
   */
  default Date getExpirationDate() {
    return null;
  }

}