content: /*
   * Copyright 1999-2023 Alibaba Group Holding Ltd.
   *
   * Licensed 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 com.alibaba.nacos.persistence.repository.embedded.hook;
  
  import java.util.HashSet;
  import java.util.Set;
  
  /**
   * Holder for Embedded apply hook.
   *
   * @author xiweng.yy
   */
  public class EmbeddedApplyHookHolder {
      
      private static final EmbeddedApplyHookHolder INSTANCE = new EmbeddedApplyHookHolder();
      
      private final Set<EmbeddedApplyHook> hooks;
      
      private EmbeddedApplyHookHolder() {
          hooks = new HashSet<>();
      }
      
      public static EmbeddedApplyHookHolder getInstance() {
          return INSTANCE;
      }
      
      public void register(EmbeddedApplyHook hook) {
          this.hooks.add(hook);
      }
      
      public Set<EmbeddedApplyHook> getAllHooks() {
          return this.hooks;
      }
  }
  