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.collections.Can;
  import org.apache.causeway.commons.having.HasEnabling;
  
  /**
   * SPI called for each pre-post change to a property of a domain entity during
   * a result of the transaction.  The callback is therefore quite fine-grained
   * and will be called  many (many) times for within any given transaction.
   *
   * <p>
   *     Only those properties of entities that have publishing enabled (using
   *  * {@link DomainObject#entityChangePublishing()}) are included.
   * </p>
   *
   *
   * @since 2.0 {@index}
   */
  public interface EntityPropertyChangeSubscriber extends HasEnabling {
  
      /**
       * Receives a single property change event for changing entities (with
       * publishing enabled using {@link DomainObject#entityChangePublishing()})
       * as an instance of {@link EntityPropertyChange}.
       *
       * <p>
       *     The callback is called (multiple times) at the end of the
       *     transaction, during the pre-commit phase.
       * </p>
       */
      void onChanging(EntityPropertyChange entityPropertyChange);
  
      /**
       * Receives a collection of {@link EntityPropertyChange property change event}s for the
       * changing entities.
       *
       * <p>
       *     The default implementation simply delegates to {@link #onChanging(EntityPropertyChange)} for
       *     each, but subclasses could override in order to perform work in bulk.
       * </p>
       * @param entityPropertyChanges
       */
      default void onChanging(Can<EntityPropertyChange> entityPropertyChanges) {
          entityPropertyChanges.forEach(this::onChanging);
      }
  }
  