content: /*
   *  Licensed to the Apache Software Foundation (ASF) under one
   *  or more contributor license agreements.  See the NOTICE file
   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you under the Apache License, Version 2.0 (the
   *  "License"); you may not use this file except in compliance
   *  with the License.  You may obtain a copy of the License at
   *
   *        http://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing,
   *  software distributed under the License is distributed on an
   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   *  KIND, either express or implied.  See the License for the
   *  specific language governing permissions and limitations
   *  under the License.
   */
  package org.apache.causeway.applib.services.publishing.spi;
  
  import org.apache.causeway.applib.annotation.DomainObject;
  import org.apache.causeway.commons.having.HasEnabling;
  
  /**
   * SPI to receive a summary of the number of entities that have changed as the
   * result of an interaction (action invocation or property edit).
   *
   * <p>
   * One use case is for performance profiling: to determine the
   * &quot;footprint&quot; of an interaction, which will have a direct impact on
   * the response time of that interaction.
   * </p>
   *
   * <p>
   *     Only those entities that have publishing enabled (using
   *  * {@link DomainObject#entityChangePublishing()}) are included.
   * </p>
   *
   * @since 2.0 {@index}
   */
  public interface EntityChangesSubscriber extends HasEnabling {
  
      /**
       * Receives all changing entities (with publishing enabled using
       * {@link DomainObject#entityChangePublishing()}) as an instance of
       * {@link EntityChanges}.
       *
       * <p>
       *     The callback is called at the end of the transaction, during the
       *     pre-commit phase.
       * </p>
       */
      void onChanging(EntityChanges entityChanges);
  }
  