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• 5.98-arez-b22
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• ChangeMapper.java

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org.realityforge.replicant.client.ChangeMapper Maven / Gradle / Ivy

package org.realityforge.replicant.client;

import javax.annotation.Nonnull;

/**
 * The ChangeMapper is responsible for applying changes to the world.
 *
 * 
The mapper will be invoked for each change message and is responsible for;
 *
 * 

 * 
creating the entity if it does not already exist
 * 
registering or de-registering the entity in the EntityRepository
 * 
applying the state changes to the entity
 * 
 *
 * 
As the ChangeMapper is very specific to the domain model that is being replicated, the ChangeMapper
 * is typically generated from a description via a tool such as Domgen.
 */
public interface ChangeMapper
{
  /**
   * Apply a single change to the world.
   *
   * @param change the Change.
   * @return the entity that was created, updated or removed.
   */
  @Nonnull
  Object applyChange( @Nonnull Change change );
}