geode-core/src/main/java/org/apache/geode/internal/cache/extension/ExtensionPoint.java

/*
 * 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.geode.internal.cache.extension;

/**
 * Allows {@link Extensible} objects to add and remove {@link Extension}s.
 *
 *
 * @since GemFire 8.1
 */
public interface ExtensionPoint<T> {

  /**
   * Add {@link Extension} to {@link ExtensionPoint}.
   *
   * @param extension to add.
   * @since GemFire 8.1
   */
  void addExtension(Extension<T> extension);

  /**
   * Remove {@link Extension} from {@link ExtensionPoint}.
   *
   * @param extension to remove.
   * @since GemFire 8.1
   */
  void removeExtension(Extension<T> extension);

  /**
   * Get {@link Iterable} of {@link Extension}s.
   *
   * @return {@link Exception}s
   * @since GemFire 8.1
   */
  Iterable<Extension<T>> getExtensions();

  /**
   * Helper method to get appropriately typed access to target {@link Extensible} object.
   *
   * @return {@link Extensible} object target.
   *
   * @since GemFire 8.1
   */
  T getTarget();

}