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   *  to you under the Apache License, Version 2.0 (the
   *  "License"); you may not use this file except in compliance
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  package org.apache.cayenne.cache.invalidation;
  
  import org.apache.cayenne.Persistent;
  import org.apache.cayenne.di.Binder;
  import org.apache.cayenne.di.ListBuilder;
  
  import java.util.Collection;
  import java.util.function.Function;
  
  /**
   * @since 4.0
   */
  public class CacheInvalidationModuleExtender {
  
      private final Binder binder;
      private ListBuilder<InvalidationHandler> invalidationHandlers;
  
      protected CacheInvalidationModuleExtender(Binder binder) {
          this.binder = binder;
      }
  
      protected CacheInvalidationModuleExtender initAllExtensions() {
          contributeInvalidationHandlers();
          return this;
      }
  
      /**
       * Disable the default {@link CacheGroupsHandler} that is tied to {@link CacheGroups} and {@link CacheGroup}
       * annotations.
       */
      public CacheInvalidationModuleExtender noCacheGroupsHandler() {
  
          // replace CacheGroupsHandler with a dummy no op handler
          binder.bind(CacheGroupsHandler.class).toInstance(new CacheGroupsHandler() {
              @Override
              public Function<Persistent, Collection<CacheGroupDescriptor>> canHandle(Class<? extends Persistent> type) {
                  return null;
              }
          });
  
          return this;
      }
  
      public CacheInvalidationModuleExtender addHandler(Class<? extends InvalidationHandler> handlerType) {
          contributeInvalidationHandlers().add(handlerType);
          return this;
      }
  
      public CacheInvalidationModuleExtender addHandler(InvalidationHandler handlerInstance) {
          contributeInvalidationHandlers().add(handlerInstance);
          return this;
      }
  
      private ListBuilder<InvalidationHandler> contributeInvalidationHandlers() {
          if (invalidationHandlers == null) {
              invalidationHandlers = binder.bindList(InvalidationHandler.class);
          }
          return invalidationHandlers;
      }
  
  }
  